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117results about How to "Low S content" patented technology
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Method for purifying and concentrating CO from calcium carbide furnace gas
ActiveCN102627280AIncrease profitHigh CO yieldCalcium carbideCarbon monoxideDeoxygenationIndustrial scale
The invention discloses a method for purifying and concentrating CO from calcium carbide furnace gas and belongs to a tail gas purification method. The method provided by the invention respectively comprises the following steps of: raw material calcium carbide furnace gas dedusting, cooling and decoking, temperature swing adsorption and precleaning, supercharging, sulphur tolerant catalytic deoxygenation, hydrolysis desulfidation, acid gas removal, arsenic removal, fine desulphurization, fine deoxidation, drying, pressure swing adsorption and concentration of CO. The invention relates to a packaged technology for purifying and concentrating CO from calcium carbide furnace gas. The technology is suitable for industrial scale application and can be adopted to make calcium carbide furnace gas containing various impurities into high-purity CO gas which is suitable for CO raw material for carbonyl synthesis or other chemical production.
Owner:SOUTHWEST RES & DESIGN INST OF CHEM IND
Austenite stainless steel and production method thereof
ActiveCN103924163AAvoid microcracksImprove yieldProcess efficiency improvementSS - Stainless steelThermal treatment
The invention relates to austenite stainless steel and a production method thereof, and belongs to the technical field of stainless steel processing. The stainless steel product mainly comprises the following chemical components in percentage by weight: less than or equal to 0.03 percent of C, 0.4-0.6 percent of Si, 1.0-1.5 percent of Mn, 16.5-18.0 percent of Cr, 10.0-11.0 percent of Ni, 0.010-0.050 percent of N, 2.00-2.50 percent of Mo, less than or equal to 0.040 percent of P, less than or equal to 0.003 percent of S, 20-40ppm of B and the balance of Fe and inevitable impure elements, wherein the DG value is between 6 and 9, the value of Md30 is 30DEG C below zero- 60 DEG C below zero. The production process comprises the following steps: intensively deoxidizing and desulfurizing, adding Fe-B to refine the grain size of an as-cast billet, adding Ca-Si wires into a ladle furnace (LF) and prolonging the time of soft blowing and standing, controlling the superheat degree to be 20-40 DEG C and constant pulling speed of 1.1-1.15m / min; and weakening secondary cooling water, performing hot rolling, cold rolling and thermal treatment, and pickling. By adopting the method, the problem of surface defects occurring in the stainless steel processing process can be alleviated, and the cold rolling yield can be increased.
Owner:GUANGDONG GUANGQING METAL TECH
Nickel-cobalt-manganese core-shell structure precursor, preparation method thereof and positive electrode material
The invention provides a nickel-cobalt-manganese core-shell structure precursor and a preparation method thereof. The precursor is compact in inner core and has pores; the shell is loose, and the primary particles are radially arranged on the inner core. The precursor structure is beneficial to diffusion of Li ions and permeation of an electrolyte in the lithium mixing and sintering process, provides a rapid migration channel for the Li ions in the charging and discharging process, and meets the structural requirements of tap density and porosity. The precursor is synthesized by adopting a wetmethod, the reaction process is divided into a first stage and a second stage, the switching point of the first stage and the second stage is determined according to the size requirement of the innercore part of the precursor, and the reaction conditions are adjusted. The preparation method is simple in process control, free of newly increased cost, wide in process application range, good in product crystallinity, low in impurity Na and S content and adjustable in precursor kernel size on the basis of an existing mainstream intermittent method process.
Owner:JINCHI ENERGY MATERIALS CO LTD +1
Method for preparing low-sulfur ternary precursor
ActiveCN103342395APrevent localized hypoalkalinityReduce generationNickel compoundsWater bathsLithium-ion battery
The invention relates to a method for preparing a low-sulfur ternary precursor, relating to lithium-ion anode materials. The method for preparing the low-sulfur ternary precursor, provided by the invention, is efficient, simple and convenient, and the sulfur content of the ternary precursor can be reduced through controlling a precipitation stage and an after-treatment method and is reduced to 2,000ppm so as to meet the requirements of lithium-ion batteries for ternary materials. The method comprises the steps of: (1) simultaneously introducing three solutions, namely ternary material liquid, a sodium hydroxide solution and ammonia water, into a reaction kettle, stirring, and carrying out chemical crystallization so as to obtain a ternary precursor; (2) filtering the ternary precursor obtained in the step (1) so as to remove mother liquor, then, conveying the ternary precursor into a turbine-stirring alkaline cleaning tank, carrying out water-bath heating, stirring and then filtering; (3) washing a product obtained after alkaline cleaning by using a plate and frame filter until the conductivity of the washed water is not higher than 20 us / cm; and (4) quickly drying a washed qualified material by a rotary kiln, and sieving to obtain the low-sulfur ternary precursor, wherein the S impurity content of the obtained low-sulfur ternary precursor is not higher than 2,000ppm.
Owner:XTC NEW ENERGY MATERIALS(XIAMEN) LTD
Process for comprehensively utilizing vanadium-titanium magnetite
The invention relates to a process for treating and comprehensively utilizing a vanadium-titanium magnetite. The process is characterized by comprising the following steps: (1) treating a raw vanadium-titanium magnetite by crushing, tailings discarding, fine grinding, low-intensity magnetic separating, high-intensity magnetic separating, and separating by a shaking table, so as to obtain a titanium concentrate and a high-vanadium-ferrum concentrate; (2) adding an adhesive to the high-vanadium-ferrum concentrate; uniformly mixing and pelletizing; drying; uniformly mixing with pulverized coal or coke powder; distributing; performing controlled reduction that V is not reduced through a coal based shaft furnace so as to obtain sponge iron, wherein the amount of used reducing agents such as the pulverized coal is 30 to 70% of the weight of high-vanadium-ferrum concentrate powder, and the reduction is performed for 10 to 18 hours at the temperature of 850 to 1060 DEG C; (3) heating the obtained sponge iron for 0.5 to 1.0 hour at the temperature less than 1050 DEG C through an intermediate frequency / main frequency furnace under a weak reduction atmosphere; then heating until the temperature is more than 1500 DEG C; performing melt separation to enable vanadium to enter slag, thus obtaining high-grade vanadium slag and high-purity molten iron. With the adoption of the process, a plurality of valuable elements in the vanadium-titanium magnetite can be effectively separated and utilized with high additional value.
Owner:WUHAN COSRED SCI & TECH LTD
Control method for inclusions in heavy rail steel
ActiveCN104975136AHigh and stable desulfurization efficiencySignificant improvementManufacturing convertersQuartzLadle furnace
The invention discloses a control method for inclusions in heavy rail steel. The method includes the following steps of converter smelting, ladle furnace (LF) refining, Ruhrstahl Heraeus (RH) vacuum treatment and continuous casting. According to the refining method, active lime is adopted in a converter, and active lime, silicon carbide and quartz sand are used for slagging in the refining process, so that the S content of molten steel is controlled to be reduced to below 0.006%, and it is guaranteed that all grades of the inclusions in the steel are lower than or equal to 2.0. According to the control method for the inclusions in the heavy rail steel, relatively high basicity is adopted, desulphurization efficiency is high and stable, and the method can obviously reduce various inclusions in the molten steel.
Owner:PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
Preparation method of high-quality 40Cr alloy structure straight-bar round steel
ActiveCN106917033AExcellent Surface and Intrinsic QualityExcellent ductility and machinabilityManufacturing convertersDeoxidizationDuctility
The invention discloses a preparation method of high-quality 40Cr alloy structure straight-bar round steel. The preparation method includes the following steps, namely, the step A of molten iron pretreatment and desulfuration, the step B of molten iron smelting, the step C of deoxidization alloying, the step D of molten iron LF furnace refining, the step E of molten iron VD furnace vacuum refining, the step F of molten iron casting, the step G of steel billet heating, the step H of rolling and the step I of steel finishing. The high-quality 40Cr alloy structure straight-bar round steel produced through the method is high in cleanliness and low in inclusion content and content of harmful elements P and S, has high strength, excellent ductility and toughness, excellent impact toughness and excellent upsetting deformation capacity, and can well meet the requirements of the field of high-end machine manufacturing industries.
Owner:WUKUN STEEL
Ternary cathode material precursor and preparation method thereof
ActiveCN107285394AHigh crystallinityUniform particle size distributionManganese oxides/hydroxidesNickel oxides/hydroxidesNickel saltManganese
The invention provides a preparation method of a ternary cathode material precursor. The preparation method comprises the following steps: (1) co-precipitation: using pure water to prepare a mixed metal ion solution of soluble nickel salts, manganese salts, and cobalt salts, mixing the mixed metal ion solution with an alkali metal hydroxide solution and an ammonium salt solution; after precipitation, separating solids and liquid, and blowing the solids to obtain a first nickel-manganese-cobalt hydroxide material; and (2) primary drying: drying the first nickel-manganese-cobalt hydroxide material obtained in the step (1) in vacuum to obtain the primarily dried ternary cathode material precursor. The ternary cathode material precursor prepared by the provided preparation method has the following physical and chemical indexes: the particle distribution span is not more than 1.2; D50 is 9 to 12 [mu]m; and the tap density is not less than 2.40 g / cm3. The preparation method has the advantages that the operation is simple, the particle distribution of prepared ternary cathode material precursor is uniform, the tap density is high, impurities can be removed easily, and the method is practical.
Owner:GEM WUXI ENERGY MATERIAL CO LTD
Corrosion-resistant steel plate for ocean platform and production method of steel plate
The invention belongs to the technical field of ferrous metallurgy, and discloses a corrosion-resistant steel plate for an ocean platform and a production method of the steel plate. The corrosion-resistant steel plate is prepared firstly from the combination of proper components in percentage by weight and then by carrying out KR molten iron pretreatment, converter smelting, argon-blowing station fed with aluminum wire, LF furnace refining, VD vacuum refining, continuous casting, heating, controlled rolling and controlled cooling, heap cooling, quenching, tempering and the like. According to the corrosion-resistant steel plate for the ocean platform and the production method of the steel plate, compared with the prior art, the produced steel plate has the advantages of excellent corrosion resistance, good low-temperature impact toughness and excellent comprehensive performance, and is especially suitable for being used under cold weather and seawater corrosion conditions.
Owner:NANYANG HANYE SPECIAL STEEL CO LTD
Production method of composite material stirring wing
InactiveCN103252449AImprove mechanical propertiesImprove mechanical properties; adding C can improve the compactness of the material structureFoundry mouldsFoundry coresWaxSmelting process
The invention provides a production method of a composite material stirring wing. The method comprises the following steps of: (1) wax pressing process; (2) shell making process; (3) dewaxing process; (4) roasting process; (5) composite material smelting process; (6) clean sand pouring process; (7) sprue removing and cleaning process; and (8) heat treatment process. The production method can be used for producing the stirring wing with high safety and reliability, and the high-quality composite material stirring wing can be produced by the method.
Owner:QINGDAO YUXIN VEHICLE ENG
Vanadium-titanium magnetite concentrate recleaning method realized through alkaline leaching, classification and reverse flotation
The invention discloses a vanadium-titanium magnetite concentrate recleaning method realized through alkaline leaching, classification and reverse flotation. The method comprises the steps of placing vanadium-titanium magnetite concentrate in aqueous alkali with a mass concentration of 5%-52% for alkaline leaching reaction at a temperature between 280 DEG C and 370 DEG C for 0.5 h - 5 h and conducting filtering to obtain a filtrate and an alkaline leached filter cake A; adding water into A to form pulp with a mass concentration of 20%-25%, and feeding the pulp into a cyclone for classification to obtain effused flow Y and set sand B; adding water into the set sand B to obtain pulp with a mass concentration of 25%-30%, and conducting reverse flotation to obtain iron ore concentrate with the TFe content ranging from 65% to 69.5% and titanium concentrate with the TiO2 content ranging from 55% to 70%. The method has the advantages that efficient sorting of the vanadium-titanium magnetite concentrate is realized, alkali consumption is low, the content of impurities such as Al and Si entering a blast furnace is reduced, the content of detrimental impurities TiO2 and S is reduced especially, the utilization coefficient of the blast furnace is increased, blast furnace slag emission is reduced, the problems of high S content and severe pollution in the smelting process are solved, and the comprehensive utilization rate of titanium resources is increased.
Owner:ANSTEEL GRP MINING CO LTD
Method for re-concentrating vanadium-titanium magnetite concentrate through alkaline leaching, acid pickling and magnetic separation
The invention discloses a method for re-concentrating vanadium-titanium magnetite concentrate through alkaline leaching, acid pickling and magnetic separation. The method comprises the following steps: placing the vanadium-titanium magnetite concentrate in an alkali solution of which the mass concentration is 5-52% to be subjected to alkaline leaching reaction at the temperature of 280-370 DEG C for 0.5-5 hours, and filtering to obtain a filtrate and an alkaline leached filter cake A; preparing the filter cake A into ore pulp by adding water according to the fact that the mass ratio of solid to liquid is 1:(1-10), placing the ore pulp into an H2SO4 solution of which the mass concentration is 1-10% to be subjected to acid pickling at the temperature of 50-90 DEG C for 5-60 minutes, and filtering to obtain a filtrate and an acid picked filter cake B; preparing the filter cake B into ore pulp of which the mass concentration is 30-35% by adding water to be subjected to magnetic separation, so as to obtain iron ore concentrate of which the TFe content is 64-68% and titanium concentrate of which the TiO2 content is 40-60%. The method has the advantages that the vanadium-titanium magnetite concentrate can be efficiently sorted, the alkali consumption is low, the content of impurities such as Al and Si entering a blast furnace, especially the content of detrimental impurities such as TiO2 and S, is reduced, the utilization coefficient of the blast furnace is increased, the iron-making cost is reduced, the problem of high S content in the smelting process is solved, and the comprehensive utilization ratio of a titanium resource is increased at the same time.
Owner:ANSTEEL GRP MINING CO LTD
Method of extracting and separating crude oil
InactiveCN106833719AAvoid cokingInhibit aggregationRefining by solvent de-asphaltingHydrocarbon oils treatmentDistillationSolvent
The invention provides a method of extracting and separating crude oil. The method comprises the step of extracting the crude oil by adopting a selective solvent, wherein the selective solvent comprises a polar non-proton solvent. According to a polarity effect and hydrogen-bond interaction, the crude oil is divided into polar and nonpolar two components. During solvent separation, an inorganic salt component in the crude oil is enriched, and corrosion of Cl to equipment is reduced. A demulsifier can be added into the solvent extraction process so that moisture in the crude oil can be removed through the solvent better. While the crude oil is separated, the content of S, N and metal in a light component can be reduced at the same time, and the processing pressure of subsequent devices is reduced. According to the method of extracting and separating the crude oil, not only is energy consumption far lower than that of distillation, but also coking, polymerization or dissociation of heavy distillates of petroleum in the process can be avoided, a high-vacuum apparatus during reduced pressure distillation is not needed either, and the operation cost and equipment cost are remarkably reduced.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Preparation and treatment method for low-sulfur manganese cobalt nickel hydroxide
InactiveCN105304864AHigh degree of crystallinityExcellent electrochemical performanceCell electrodesOxideHydroxide
The invention discloses a preparation and treatment method for low-sulfur manganese cobalt nickel hydroxide. According to the method, the crystallization degree of a product is increased by controlling parameters including a pH value and the like in a synthetic process, impurities in a crystal structure are reduced, and the effect of reducing the S content of the product is achieved in a mode of combining special alkali liquor elution with water washing. The S content of a prepared material is low and reaches 0.1%, so that a positive electrode material prepared from a precursor has excellent electrochemical performance.
Owner:BEIJING EASPRING MATERIAL TECH CO LTD
Ternary precursor with core-shell structure and preparation method and application thereof
ActiveCN113428910AAvoid the problem of uncontrollable granularityAvoid low tap density problemsCell electrodesSecondary cellsNickel saltManganese
The invention relates to the technical field of ternary precursor materials, in particular to a ternary precursor with a core-shell structure and a preparation method and application thereof. The ternary precursor with the core-shell structure is prepared by taking hydroxide precipitates of nickel, cobalt and manganese as a core and carbonate precipitates as a shell; the hydroxides of nickel salt, cobalt salt and manganese salt are taken as cores, and carbonate precipitation reaction is carried out on the basis, so that the problem of uncontrollable granularity caused by poor early-stage process stability of single carbonate can be effectively avoided; in addition, by controlling the particle size of the inner core, the problem of low tap density of a single carbonate precursor can be effectively avoided; and the outer carbonate can effectively improve the sphericity and the specific surface area of the material. The obtained ternary precursor with the core-shell structure is good in sphericity degree, large in specific surface area and low in S content.
Owner:GUANGDONG JIANA ENERGY TECH CO LTD +1
Method for manufacturing Ni steel moderately-thick plate for low-temperature container
The invention provides a method for manufacturing a Ni steel moderately-thick plate for a low-temperature container. The Ni steel moderately-thick plate comprises, by weight, 0.03-0.07% of C, 0.10-0.25% of Si, 0.50-0.90% of Mn, 0-0.005% of S, 0-0.008% of P, 3.25-3.75% of Ni, 0.02-0.05% of Alt and the balance Fe. The method comprises the steps that a continuous casting billet is heated to 1150-1200 DEG C, two-stage controlled rolling is conducted after heat preservation is conducted for one to two hours, the rough rolling start temperature is 1030-1100 DEG C, and the finish rolling temperature is 800-870 DEG C; laminar cooling is conducted after rolling, and the red return temperature is 630-700 DEG C. A quenching and tempering heat treatment process is adopted; the quenching temperature is 820-870 DEG C, and the heat preservation time is 30-70 minutes; the tempering temperature is 580-620 DEG C, and the heat preservation time is 30-80 minutes; air cooling is conducted after tempering. According to the method, the alloy components are simple; the steel plate has good matching for strength and toughness, is suitable for manufacturing liquefied petroleum gas (LPG) storage tanks and further can replace 5Ni steel for manufacturing storage tanks for liquefied ethylene gas (LEG) and the like.
Owner:NANJING IRON & STEEL CO LTD
Preparation method of flaky iron phosphate, the prepared flaky iron phosphate and application of the flaky iron phosphate
InactiveCN110436428AImprove grinding efficiencyReduce entryPhosphorus compoundsIron saltsLithium iron phosphate
The invention discloses a preparation method of flaky iron phosphate, the prepared flaky iron phosphate and application of the flaky iron phosphate. The preparation method comprises the following steps: 1, preparing a ferrite solution, adding phosphoric acid, and adding an oxidant to oxidize ferrous ions into iron ions; 2, preparing a mixed solution from phosphoric acid and sodium hydroxide; 3, heating the mixed solution to 90-100 DEG C, and adding an iron ion solution; and 4, calcining the prepared product to obtain the flaky iron phosphate. In the method, feeding is performed at high temperature, so that almost no yellow intermediate is generated in the feeding process, and a white flaky iron phosphate product is rapidly formed in the feeding process; the process avoids the traditional process of adding a phosphorus salt into an iron salt to generate a yellow intermediate and then gradually turn the yellow intermediate into white. The flaky iron phosphate prepared by the scheme provided by the invention is higher in grinding efficiency and lower in sulfur content; therefore, when the method is applied to the preparation process of lithium iron phosphate, higher battery capacity can be obtained.
Owner:HUNAN YACHENG NEW MATERIAL CO LTD
Method for recleaning vanadium-titanium magnetite concentrate by calcining, alkaline leaching and desliming
The invention discloses a method for recleaning vanadium-titanium magnetite concentrate by calcining, alkaline leaching and desliming. The method comprises the following steps: adding CaO into vanadium-titanium magnetite concentrate and calcining for 20-60 minutes at 800-1400 DEG C to form a calcined product A; and putting A in aqueous alkali, carrying out alkaline leaching reaction for 0.5-5 hours at 300-370 DEG C, and filtering to obtain a filtrate and a filtered alkaline leached filter cake B, and adding water into B to prepare pulp to be deslimed to obtain settled sands C and overflow D, wherein the settled sands C are the final iron ore concentrates with the TFe content range of 60-68% and the overflow D is the final titanium concentrate with the TiO2 content range of 40-50%. The method disclosed by the invention has the advantages that the consumption of NaOH or KOH is reduced, the vanadium-titanium magnetite concentrate is efficiently sorted, the alkaline consumption is low, the content of impurities such as Al and Si entering into a blast furnace is reduced, the utilization coefficient of the blast furnace is improved, the iron smelting cost is reduced, and the problem of severe pollution is solved; meanwhile, the comprehensive utilization ratio of titanium resources is improved.
Owner:ANSTEEL GRP MINING CO LTD
Preparation method for H08MnA no-twist controlled-cooling hot-rolled wire rod for submerged-arc welding wire
InactiveCN105562961ALow S contentIncreased sensitivityWelding/cutting media/materialsSoldering mediaWire rodMaterials science
The invention relates to a preparation method for a wire rod for a welding wire, in particular to a preparation method for an H08MnA no-twist controlled-cooling hot-rolled wire rod for a submerged-arc welding wire. According to the technical scheme adopted by the invention, the preparation method for the H08MnA no-twist controlled-cooling hot-rolled wire rod for the submerged-arc welding wire is characterized in that the wire rod consists of the following chemical components in proportion: 0.045-0.095% of C, 0.88-1.02% of Mn, 0.035-0.065% of Si, less than or equal to 0.009% of P, less than or equal to 0.009% of S and the balance of Fe; the wire rod is rolled through a no-twist high-speed wire rolling mill, and then is cooled by a delay type Stelmor process after being rolled. According to the preparation method for the H08MnA no-twist controlled-cooling hot-rolled wire rod for the submerged-arc welding wire provided by the invention, product metallurgical quality, chemical components and drawing properties are guaranteed to meet usage needs.
Owner:BENGANG STEEL PLATES
Method for recleaning vanadium titanium magnetite concentrate by using alkaline leaching and desliming
The invention discloses a method for recleaning vanadium titanium magnetite concentrate by using alkaline leaching and desliming. The method comprises the following steps: placing vanadium titanium magnetite concentrate into an alkaline solution with the mass concentration of 5-52%, performing alkaline leaching reaction for 0.5-5 hours at the temperature of 260-370 DEG C, and filtering to obtain a filtrate and an alkaline-leached filter cake A; adding water to the A to prepare A to ore slurry with the mass concentration of 21-15 % for performing desliming operation so as to obtain a sand setting B and an overflow C, wherein the sand setting B is a final iron concentrate with the TFe content of 60-68%, and the overflow C is a final titanium concentrate with the TiO2 content of 40-50%. The method has the advantages that the efficient separating of the vanadium titanium magnetite concentrate is realized; the alkali consumption is low; the contents of impurities such as Al and entering a blast furnace can be reduced, in particular the contents of harmful impurities such as TiO2 and S; the blast furnace utilization coefficient is increased; the blast furnace slag discharge capacity is reduced; the ironmaking cost is reduced; the problems of high S content and serious pollution in the smelting process can be solved; meanwhile, the comprehensive utilization of a titanium resource is improved.
Owner:ANSTEEL GRP MINING CO LTD
Method for recleaning of vanadium-titanium magnetite concentrate by using alkaline leaching, grading and magnetic separation
ActiveCN103949335AEfficient separationLow S contentMagnetic separationWet separationMagnetiteImpurity
The invention discloses a method for recleaning of a vanadium-titanium magnetite concentrate by using alkaline leaching, grading and magnetic separation. The method comprises the following steps of placing the vanadium-titanium magnetite concentrate into alkali solution with the mass concentration of 5-52%, reacting for 0.5-5 hours in an alkaline leaching mode at 280-370 DEG C, and filtering to obtain filtrate and an alkaline leaching filter cake A; adding water into A to make mine pulp with the mass concentration of 20-25% and feeding into a swirler for grading to obtain overflows and setting sand B; adding water into B to make mine pulp with the mass concentration of 30-36% and performing magnetic separation to obtain final iron ore concentrate with the TFe content range being 63-68% and final titanium concentrate with the TiO2 content range being 35-50%. The method has the advantages that the efficient separation for the vanadium-titanium magnetite concentrate is realized, the alkaline consumption is low, the contents of impurities such as Al and Si, particularly harmful impurities of TiO2 and S, which enter a blast furnace are reduced, the use coefficient of the blast furnace is improved, the discharge of blast furnace slag is reduced, the puddling cost is reduced, and the problems of high S content and severe pollution in the smelting process are solved; the comprehensive use rate of the titanium resources is improved.
Owner:ANSTEEL GRP MINING CO LTD
Method for recleaning vanadium-titanium magnetite concentrate by using alkaline leaching and grading
The invention discloses a method for recleaning vanadium-titanium magnetite concentrate by using alkaline leaching and grading. The method comprises the following steps: putting the vanadium-titanium magnetite concentrate in aqueous alkali with the mass concentration of 5-52%, carrying out alkaline leaching reaction at the temperature of 280-370 DEG C for 0.5-5 hours, and filtering so as to obtain filtrate and alkaline leaching filter cakes A; adding water to the alkaline leaching filter cakes A so as to prepare ore pulp with the mass concentration of 20%-25%, feeding the ore pulp into a hydrocyclone, and grading so as to respectively obtain iron ore concentrate with the TFe content of 60-68% and the titanium concentrate with the TiO2 content of 35-50%. The method has the advantages that the high-efficiency grading of the vanadium-titanium magnetite concentrate is realized, the alkali consumption is low, the content of impurities such as Al and Si entering a blast furnace is reduced, especially, the content of detrimental impurities such as TiO2 and S is reduced, the utilization coefficient of the blast furnace is increased, the discharge amount of blast furnace slag is reduced, the iron smelting cost is reduced, the problems of high S content and serious pollution in a smelting process are solved, and meanwhile, the compressive utilization rate of titanium resources is increased.
Owner:ANSTEEL GRP MINING CO LTD
High-carbon high-chromium cold work die steel and preparation method thereof
ActiveCN109468544AStrong toughness and wear resistanceImprove purityProcess efficiency improvementHigh carbonDie casting
The invention belongs to the technical field of cold work die steel production, and particularly relates to high-carbon high-chromium cold work die steel and a preparation method thereof. The high-carbon high-chromium cold work die steel and the preparation method thereof aim to solve the technical problem that an existing high-carbon high-chromium cold work die steel preparation method is small in production batch. The provided high-carbon high-chromium cold work die steel is composed of the following components of, by weight, 1.42-1.60% of C, less than or equal to 0.40% of Si, less than or equal to 0.40% of Mn, less than or equal to 0.030% of P, less than or equal to 0.015% of S, less than or equal to 0.25% of Ni, 11.00-13.00% of Cr, 0.80-1.20% of Mo, 0.70-1.10% of V, less than or equalto 1.00% of Co, and the balance Fe. The preparation method of the high-carbon high-chromium cold work die steel comprises the following steps of a, performing proportioning; b, performing smelting, refining, vacuum treatment and die casting; c, performing cogging; and d, performing post-treatment to obtain the high-carbon high-chromium cold work die steel. According to the method, batch productioncan be realized, and the production cost is reduced.
Owner:CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
Low hygroscopicity submerged-arc welding sintered flux and preparation method thereof
InactiveCN109454361ALow S contentImprove the ability to resist H2S corrosionArc welding apparatusWelding/cutting media/materialsSlagPolyvinyl alcohol
The invention relates to low hygroscopicity submerged-arc welding sintered flux and a preparation method thereof. The low hygroscopicity submerged-arc welding sintered flux is prepared from the following components in percent by weight: 13-28% of fluorite, 16-20% of bauxite, 20-28% of magnesite, 28-45% of marbles, 17-20% of wollastonite, 3-6% of rutile, 0.1-1.2% of zircon sand, 3-6% of polyvinyl alcohol, 1.2-3.6% of chrome green, 2-8% of sodium carbonate, 3-6% of metal nickel, 2-5% of manganese metal and 1-3% of rare earth oxides. By adjusting a flux slag system and improving the manufacturingprocess by means of a weld joint alloy transitional mode, the invention provides the low hygroscopicity submerged-arc welding sintered flux which is excellent in low temperature impact toughness.
Owner:DONGGUAN UNIV OF TECH
Method for improving corrosion resistance of nitrogen-containing duplex stainless steel
ActiveCN113234894AStrong desulfurization abilityReduce sulfur contentSS - Stainless steelUltimate tensile strength
The invention belongs to the technical field of nitrogen-containing duplex stainless steel production, and provides a method for improving the corrosion resistance of nitrogen-containing duplex stainless steel. A trace amount of niobium is added into nitrogen-containing stainless steel, niobium-containing Z-phase wrapping inclusions are easy to precipitate, and the corrosion resistance of the duplex stainless steel is improved. By optimizing the refining process, the inclusions are fine and dispersed and are easily wrapped by the niobium-containing phase; in the casting process, the cooling strength is controlled to be the lowest cooling strength in the casting process in the area corresponding to the temperature interval where the niobium-containing phase is precipitated, precipitation of the niobium-containing phase with the inclusion as the core is promoted, and the proportion of the inclusion wrapped by the niobium-containing phase is increased; then the cooling strength is improved, and excessive growth of niobium-containing phases and precipitation of harmful phases are avoided; and according to the method provided by the invention, the corrosion problem caused by inclusions can be effectively avoided, and a good guarantee is provided for long-life and stable service of the material in a typical environment.
Owner:NORTHEASTERN UNIV
Sulfur-containing and bismuth-containing free cutting stainless steel and preparation method thereof
InactiveCN109825770AGuaranteed surface qualityLow S contentProcess efficiency improvementElectric furnaceWire rodSolid solution
The invention discloses a sulfur-containing and bismuth-containing free cutting stainless steel. The sulfur-containing and bismuth-containing free cutting stainless steel comprises less than or equalto 0.08% of C, 0.5-1.0% of Si, 2.0-3.0% of Mn, less than or equal to 0.06% of P, 0.20-0.35% of S, 8.5-1.0% of Ni, 17.0-19.0% of Cr, 2.0-3.0% of Cu, 0.02-0.2% of Bi, less than or equal to 0.07% of N and the balance of iron and inevitable impurities according to the weight percentage. The invention further discloses a preparation method of the sulfur-containing and bismuth-containing free cutting stainless steel. According to the sulfur-containing and bismuth-containing free cutting stainless steel, by using a method of adding a bismuth element, the cutting performance of a material is improved;by reducing the sulfur content and using an intermediate slab online heating and dry head rolling technology during rolling, a problem that the hot-working character becomes poor due to the adding ofbismuth is solved; solid solution adopts 1050 degrees centigrade complete solid solution process; before acid pickling of a steel wire rod, a problem that the acid pickling surface is easy to be superacid after high temperature treatment is solved through salt bath treatment.
Owner:宝钢特钢长材有限公司
Method for inhibiting low-sulfur steel from being subjected to refinement and resulfurization in LF furnace
The invention discloses a method for inhibiting low-sulfur steel from being subjected to refinement and resulfurization in an LF furnace. The method comprises the following steps of, desulfurizing molten iron of a steel grade with S content not more than 0.03 wt%; smelting in a converter; refining in an LF furnace; carrying out pouring and subsequent procedures, wherein the time from the end of molten steel pouring to the beginning of pouring refining slag out of a molten steel tank is controlled to be not more than 13 min; and Then loading the smelted low-sulfur molten steel into the molten steel tank, and carrying out conventional refining and subsequent procedures on the sulfur molten steel in the LF furnace. According to the method, by smelting steel with S content not more than 0.03 wt% in one furnace and controlling the alkalinity of the refining slag in the LF furnace to be less than or equal to 1.2 and the sulfur content in the refining slag to be not more than 0.2 wt%, so that the content of sulfur attached in the molten steel tank is reduced; and after the low-sulfur molten steel to be refined is filled into the molten steel tank, the resulfurization of the low-sulfur steel subjected to LF refining is stabilized to be less than or equal to 0.001 wt%, the judgment-changing rate of the low-sulfur steel is reduced to 1.25% from the original 15.78%, and steel material consumption (molten iron slagging-off) is reduced by 2-3 kg / t.
Owner:武汉钢铁有限公司
Method for recleaning of vanadium-titanium magnetite concentrates by utilizing alkaline leaching, desliming and magnetic-gravity combined separation
ActiveCN103977880AImprove utilization factor of blast furnaceReduce emissionsWet separationOre concentrateSmelting process
Owner:ANSTEEL GRP MINING CO LTD
Vanadium-titanium magnetite concentrate re-concentration method achieved through oxidation alkaline leaching, acid pickling, desliming and gravity and magnetism
InactiveCN105013608AMild reaction conditionsEquipment corrosion is smallMagnetic separationTitaniumMineralogy
The invention relates to a vanadium-titanium magnetite concentrate re-concentration method achieved through oxidation alkaline leaching, acid pickling, desliming and gravity and magnetism. The method is characterized by including the following steps that oxidation alkaline leaching is performed on vanadium-titanium magnetite concentrate, and the vanadium-titanium magnetite concentrate is placed in an alkaline solution; oxidization agents are added; then, an alkaline leaching reaction lasts for 0.5-2 h at the temperature of 220-330 DEG C; filtration is performed, and then filter liquor and alkaline leached filter cakes A are obtained; water is added in the alkaline leached filter cakes A, and ore pulp is prepared; then, the ore pulp is placed in a H2SO4 solution, and acid pickling is performed for 5-60 min at the temperature of 50-90 DEG C; filtration is performed, and filter liquor and acid leached filter cakes B are obtained; water is added into B, and ore pulp with the mass concentration being 30-35% can be prepared; and desliming and gravity and magnetism combined re-concentration is performed, and iron concentrate with the TFe content being 64-70% and titanium concentrate with the TiO2 content being 60-82% can be obtained respectively. The method has the beneficial effects that due to introduction of O2 or H2O2 during oxidation alkaline leaching, S compounds can be oxidized, the reaction is accelerated, the reaction temperature is lowered, the reaction time is shortened, and energy consumption and equipment investment are greatly reduced.
Owner:ANSTEEL GRP MINING CO LTD
Method for recleaning vanadium titanium magnetite concentrate by using alkaline leaching, pickling and reverse flotation
The invention discloses a method for recleaning vanadium titanium magnetite concentrate by using alkaline leaching, pickling and reverse flotation. The method comprises the following steps: putting vanadium titanium magnetite concentrate into an alkaline solution of which the mass concentration is 5-52%; carrying out alkali leaching reaction at 280-370 DEG C for 0.5-5 hours; filtering to obtain filtrate and an alkali leaching filter cake A; adding water to A to prepare ore pulp of which the solid-liquid mass ratio is 1:(1-10), putting into an H2SO4 solution of which the mass concentration is 1-10%, picking at 50-90 DEG C for 5-60 minutes, and filtering to obtain filtrate and a pickling filter cake B; adding water to B to prepare ore pulp of which the mass concentration is 25-30%, carrying out reverse flotation, so as to respectively obtain iron ore concentrate of which the TFe content is 65-69.5% and titanium concentrate of which the TiO2 content is 40-80%. The method has the advantages that the vanadium titanium magnetite concentrate is efficiently sorted, the alkali consumption is low, such impurities entering a blast furnace as such as Al, Si, especially TiO2 and S, are reduced, the utilization coefficient of the blast furnace is improved, the discharge of blast furnace slag is reduced, the ironmaking cost is reduced, and meanwhile, the comprehensive utilization rate of titanium resources is improved.
Owner:ANSTEEL GRP MINING CO LTD
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