40 results about "Basic chromium sulfate" patented technology

The invention belongs to the technical field of wet metallurgy, and particularly relates to a method for carrying out two-stage countercurrent leaching on chromium-containing vanadium slag and extracting vanadium and chromium in a separating manner. The method comprises the following steps: carrying out atmospheric pressure leaching on the chromium-containing vanadium slag at first; leaching under pressure and selectively carrying out chromium depositing; then preparing basic chromium sulfate and V2O5; after removing manganese, iron, aluminum and impurities from waste liquid generated in the process by oxidation, carrying out evaporative crystallization on part of an obtained solution to obtain sodium sulfate; and returning the other part of the obtained solution as a circulating leaching liquid to the atmospheric pressure leaching procedure. A step-by-step extracting path of extracting chromium at first and then extracting vanadium is adopted, in the chromium extracting process, the vanadium is hardly extracted, vanadium and chromium separation rate is greater than 99%, finally, vanadium and chromium resource utilization rate is increased, the leaching rate of the vanadium is greater than 95%, and the leaching rate of the chromium is greater than 92%.

The invention relates to a method for separating and recovering vanadium and chromium from vanadium-chromium reduced waste residue. The method comprises the following main steps of: after removing water-soluble salts through slurrying and washing, extracting vanadium from the rest vanadium-chromium reduced waste residue by oxidizing in an alkaline solution; meanwhile, realizing the vanadium-chromium separation; cooling and crystallizing a leaching solution to obtain obtaining a sodium orthovanadate product; carrying out acid leaching on the vanadium-chromium reduced waste residue subjected to vanadium extraction; and preparing a basic chromium sulfate product after removing impurities, evaporating and crystallizing. According to the invention, the purity of the sodium orthovanadate product prepared by the method is higher than 93%, the content of Cr2O3 in the basic chromium sulfate can reach 24%, the content of Fe is lower than 0.1%, and the requirements on the basic chromium sulfate I type product in the HG / T 2678-2007 are met.

The invention discloses a method for preparing a basic chromium sulfate-chrome tanning agent by using lignite wax as a reducing agent. The method comprises the processes of primary oxidation, secondary oxidation and oxidation liquid modulation, wherein the primary oxidation comprises the steps of acidizing the lignite wax for 1 hour and then stirring and oxidizing for 4-6 hours; the secondary oxidation comprises the steps of acidizing the primary oxidation liquid for 20-40 minutes and then stirring and oxidizing for 2-3 hours; the method further comprises the steps of adding the primary oxidation liquid and the secondary oxidation liquid into a reaction kettle, determining the adding amount of an oxidizing agent and a reducing agent, adding the oxidizing agent and the reducing agent into the reaction kettle sequentially and slowly, strictly controlling the reaction temperature at 105-115 DEG C, stirring and oxidizing for 1-2 hours, standing, ageing, spray-drying and forming to obtain the basic chromium sulfate-chrome tanning agent. Compared with the pure sugar reducing agent, the neutral salt content of the basic chromium sulfate-chrome tanning agent is reduced by above 30 percent, the chrome absorption quantity of leather is enhanced, and the plumpness and humidity-resistant and heat-resistant stability of the leather are improved. The basic chromium sulfate-chrome tanning agent comprises organic micromolecular acid with a good masking effect, particularly sulfonated phthalic acid, so that the leather is plump and soft, and has elasticity, natural brightness and wax feel.

The invention discloses a method for preparing chromium sulfate basic by utilizing residual liquor obtained during menadione production. The method comprises the following steps: uniformly mixing the concentrated residual liquor with industrial sugar according to a certain molar ratio, and reacting in a pressure reactor for 0.5-4 hours at the temperature of 100 to 300 DEG C under the pressure of 0 to 4MPa; completely reducing a small amount of unreacted hexavalent chromium in the feed liquid into trivalent chromium by using a reducing agent after the reaction is ended; regulating the basicity of the feed liquid by using an alkaline solution, filtering, performing spray drying on the filtrate, thus obtaining the chromium sulfate basic product. According to the method disclosed by the invention, a pressure-conditioned curing reaction is adopted, residual organic matters in the menadione residual liquor can be effectively removed, and the quality of chromium powder is improved. The method disclosed by the invention is simple in process, high in reaction rate, low in energy consumption, clean and environment-friendly.

According to the cast aluminum alloy for the automobile metal casting and the machining technology of the cast aluminum alloy, the comprehensive performance of the cast aluminum alloy is improved by limiting the element composition and content in the aluminum alloy and matching with the optimal design of the machining technology; the aluminum alloy is defined as follows: Zn + Cu < = 2Mg, Er + Sr + Y + Yb < = 0.7%, and the mass ratio of Mn to Fe is 1.1-1.3. The tensile strength of the aluminum alloy is greatly improved through the synergistic effect of Er, Sr, Y and Yb elements; according to the process, second-phase particles are distributed more uniformly and dispersed through high-temperature intermittent ultrasonic treatment, and intra-crystalline segregation is eliminated through homogenizing annealing; the annealed aluminum alloy is subjected to solid solution two-stage aging treatment to eliminate lattice distortion; after the formed aluminum alloy is subjected to arc oxidation, the hole sealing liquid obtained by compounding the potassium fluozirconate, the basic chromium sulfate, the acetic acid and the tartaric acid is used for hole sealing, and compared with existing hole sealing through boiling water, the hole sealing time is short, the hole sealing temperature is low, and the corrosion resistance of the aluminum alloy is effectively improved under low energy consumption.

An nickel plating layer (5a) intended for corrosion current distribution is formed over a body (2), and a 0.05 to 2.5 micrometers thick surface chrome plating layer (6) made of trivalent chromium is formed on the surface thereof using basic chromium sulfate as a source of metal. Further on the same, a not less than 7 nm thick chromium compound film (7) is formed by cathode acidic electrolytic chromatin. The corrosion distribution nickel plating layer (5a) has a function of forming a microporous structure, a microcrack structure, or the both of the same in the surface chrome plating layer (6).

The invention provides a method of preparing a basic chromium sulfate tanning agent from chromite sulfuric acid leachate, belongs to the technical field of ore processing, and aims to solve the problem that iron cannot be removed from chromite sulfuric acid leachate easily in the prior art. In the provided method, the temperature of chromite sulfuric acid leachate is controlled in a range of 60 to 100 DEG C, the pH value is controlled in a range of 1 to 3, then a pyrite crystal seed is added to carry out crystallization; then the crystals are filtered to obtain pyrite crystals and a filtrate; the temperature of the filtrate is maintained, the pH of the filtrate is adjusted to a range of 2 to 4, then adding a goethite crystal seed to carry out crystallization; the crystals are filtered to obtain goethite crystals and a filtrate; a diluted alkali solution is added into the filtrate to neutralize the filtrate, after neutralization, the basicity of the solution is in a range of 32 to 34%; and then the solution is dried to obtain the basic chromium sulfate tanning agent. During the preparation process, no virulent Cr(VI) is generated; the method is clean and nontoxic therefore, moreover, the iron is removed in two steps, thus the iron is almost removed, and the iron content of the obtained basic chromium sulfate tanning agent in mass percentage is less than 0.1%.

The invention relates to a method for preparing acid black 172. The method comprises the following steps that: (1) 6-nitro-1 and 2-diazoxynaphthalene-4-sulfonic acid are put into a dissolution tank, added with water for dissolution, added with a sodium hydroxide solution and stirred. (2) 2-naphthol is put into the dissolution tank, added with water for dissolution, added with the sodium hydroxide solution, stirred, heated, added with a dispersant and aliphatic diol or ether and stirred again; (3) a prepared 2-naphthol solution is rapidly put into and coupled with a solution with 6-nitro-1 and2-diazoxynaphthalene-4-sulfonic acid so as to obtain coupled liquid; and (4) the coupled liquid is added with formic acid, ammonium bicarbonate or sodium bicarbonate and basic chromium sulfate, heated to be between 100 and 102 DEG C, thermally insulated and stirred so as to obtain an acid black 172 serous finished product. The method for preparing acid black 172 has the advantages of simple production process, scientific reasonable control on reaction conditions, short production cycle of produces, high yield, good quality, friction resistance, obviously raised fastness of resisting rinse and sunshine, obviously reduced side reaction and impurities, low production cost, high production efficiency and better environment-friendly property.

The invention relates to a preparation method of anti-migration dye. The preparation method includes the following steps that 4-amyl-2-amino-6-nitrophenol is added into a sodium hydroxide solution, and sodium nitrite is added so that a solution A can be obtained; the solution A is dropwise added into water, ice and hydrochloric acid so that diazonium salt can be obtained; 1,3,5-pyrazolone is dissolved in sodium carbonate and sodium hydroxide so that coupled liquid can be obtained, diazonium salt is added into the coupled liquid to react, and azo dye is obtained; basic chromium sulfate is dissolved in water, a salicylic acid solution dissolved through a sodium hydroxide solution is added, and a chromizing agent is prepared; the azo dye and the chromizing agent are mixed, the pH value is adjusted to be 10-11, a reaction solution is cooled to 65-70 DEG C with disappear of the azo dye as a reaction end point, the dye is precipitated and cooled to 45 DEG C or below, and filtering, washing and drying are performed so that the anti-migration dye can be obtained. The dye prepared through the preparation method is high in migration resistance and can meet the requirement of a high-quality terminal market.

The invention relates to a process for treatment of heavy metal and recovery of an inorganic salt and especially to a process for preparing basic chromium sulfate by using a waste chromium material. In the process, a waste chromium liquid storage tank, an acidifying device, a reduction device, a reaction vessel, a condensation kettle, a press filtration device, a spray drying device and a gas purifying device are utilized; the process comprises the following steps: collecting electroplating and other chromium-containing waste liquid and waste residue, adding the collected waste liquid and waste residue into an acidifying reaction vessel, optimizing a formula for reagents, removing other impurity components except chromium components through addition and reaction of the reagents and press filtration, carrying out further dehydration by adjusting the condensation kettle for further reaction and preparing the product of basic chromium sulfate by using a centrifugal spray drier. The process provided in the invention is optimized, reasonable, simple and easy, makes the most of natural resources and natural conditions, has the advantages of low production cost, small investment and high yield and enables the problem of waste chromium pollution to be effectively overcome and the waste chromium material to be processed into inorganic chemical products, thereby producing remarkable environmental and economic benefits.

The invention provides a method of preparing a basic chromium sulfate tanning agent from chromite sulfuric acid leachate, belongs to the technical field of ore processing, and aims to solve the problem that iron cannot be removed from chromite sulfuric acid leachate easily in the prior art. In the provided method, the temperature of chromite sulfuric acid leachate is controlled in a range of 60 to 100 DEG C, the pH value is controlled in a range of 1 to 3, then a pyrite crystal seed is added to carry out crystallization; then the crystals are filtered to obtain pyrite crystals and a filtrate; the temperature of the filtrate is maintained, the pH of the filtrate is adjusted to a range of 2 to 4, then adding a goethite crystal seed to carry out crystallization; the crystals are filtered to obtain goethite crystals and a filtrate; a diluted alkali solution is added into the filtrate to neutralize the filtrate, after neutralization, the basicity of the solution is in a range of 32 to 34%; and then the solution is dried to obtain the basic chromium sulfate tanning agent. During the preparation process, no virulent Cr(VI) is generated; the method is clean and nontoxic therefore, moreover, the iron is removed in two steps, thus the iron is almost removed, and the iron content of the obtained basic chromium sulfate tanning agent in mass percentage is less than 0.1%.

The invention discloses a method for preparation of basic chromium sulfate from chromium phosphate, relates to a method for preparation of the basic chromium sulfate from chromium-containing material chromium phosphate, particularly relates to a method for extraction and separation of chromium in mixed electroplating sludge and phosphorus chromium slag to obtain chromium phosphate and then extending preparation of the basic chromium sulfate. The method is characterized by sequentially comprising the following steps: (1) adding water into a chromic phosphate raw material for mixing slurry; (2) adding a reducing agent for reducing processing; (3) adding an alkali for phosphate radical removal reaction; (4) filtering to obtain chromium hydroxide and alkali liquid; (5) redissolving the chromium hydroxide with sulfuric acid; (6) adding NaOH alkali solution into redissolving solution to adjust solution pH, aging to obtain basic chromium sulfate solution; and (7) evaporating and crystallizing to obtain basic chromium sulfate. The method is a simple-process short-flow environmentally-friendly high chromium value utilization hydrometallurgy technology, and is suitable for application in the field of resource utilization of chromium phosphate in electroplating sludge, chromium phosphate slag and waste slag sludge.

The invention discloses a method for preparing a basic chromium sulfate-chrome tanning agent by using lignite wax as a reducing agent. The method comprises the processes of primary oxidation, secondary oxidation and oxidation liquid modulation, wherein the primary oxidation comprises the steps of acidizing the lignite wax for 1 hour and then stirring and oxidizing for 4-6 hours; the secondary oxidation comprises the steps of acidizing the primary oxidation liquid for 20-40 minutes and then stirring and oxidizing for 2-3 hours; the method further comprises the steps of adding the primary oxidation liquid and the secondary oxidation liquid into a reaction kettle, determining the adding amount of an oxidizing agent and a reducing agent, adding the oxidizing agent and the reducing agent into the reaction kettle sequentially and slowly, strictly controlling the reaction temperature at 105-115 DEG C, stirring and oxidizing for 1-2 hours, standing, ageing, spray-drying and forming to obtain the basic chromium sulfate-chrome tanning agent. Compared with the pure sugar reducing agent, the neutral salt content of the basic chromium sulfate-chrome tanning agent is reduced by above 30 percent, the chrome absorption quantity of leather is enhanced, and the plumpness and humidity-resistant and heat-resistant stability of the leather are improved. The basic chromium sulfate-chrome tanning agent comprises organic micromolecular acid with a good masking effect, particularly sulfonated phthalic acid, so that the leather is plump and soft, and has elasticity, natural brightness and wax feel.

The invention discloses a method for preparing basic chromium sulfate tanning liquor by using tanning chromium sludge, and solves problems in existing method for preparing tanning liquor by using tanning chromium sludge, such as violent reaction, high operation risk coefficient, incomplete organic compound hydrolysis, poor infiltration of the obtained tanning liquor and complex preparation process and steps. The method comprises the following steps: (1) homogenization; (2) leaching; (3) filter pressing; (4) pressure reduction; and (5) cooling and depressurization. The invention has beneficial effects of mild chemical reaction, easily controlled reaction, capability of completely reducing hexavalent chromium to trivalent chromium, low production cost, no introduction of new impurity, simple processing steps, high purity of the finally obtained chrome tanning liquor, high reduction rate of hexavalent chromium, small consumption amount of ethanol or industrial alcohol, deep hydrolysis of organic small molecules, further enhancement of purity and tanning property of the finally obtained tanning liquor.

The invention relates to a method for determination of hexavalent chromium in basic chromium sulfate and belongs to the technical field of chemical analysis. The method comprises dissolving a sample to be measured, immediately adding MgCl2 and FeCl3 into the solution, adjusting pH to about 10 so that chromium hydroxide precipitates completely, filtering and washing the precipitates to completely separate hexavalent chromium from trivalent chromium, and detecting the hexavalent chromium in the filtrate by a diphenylcarbazide spectrophotometry to obtain the content of hexavalent chromium. The method realizes elimination of interfering elements and complete separation of trivalent chromium and hexavalent chromium, prevents too high hexavalent chromium content caused by oxidation of trivalent chromium into hexavalent chromium in separation and has high accuracy and a good precision.

The present invention relates to a migration-resistant red dye, a preparation method therefor and application thereof. The preparation method for the dye comprises the following steps: (a) mixing 2-amino-5-nitrophenol, 2-aminophenol-4-sulfamide, sodium nitrite, hydrochloric acid and water to react, and obtaining a diazonium product; (b) adding a mixed solution of 3-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl) benzenesulfonamide, caustic soda liquid and water to a vessel to react with the resulting diazonium product in the step (a), and obtaining a coupling product; (c) performing chromium complexation on basic chromium sulfate and the resulting coupling product in the step (b); (d) reacting a product obtained from the chromium complexation with a mixed solution of formic acid, n-tridecyl amine and water; and (e) after completion of the reaction, filtering and drying. The dye is resistant to a high temperature, is relatively inexpensive, and has good migration resistance.