34results about How to "Reduce magnesium oxide content" patented technology

The invention relates to a mineral processing technology capable of reducing the content of magnesium oxide in flotation concentrates of sulphide copper ores, and belongs to the technical field of mineral processing. The method comprises the following four steps: ore grinding, flotation, regrinding and concentration. Compared with the prior art, the mineral processing technology has the characteristics that sodium humate is used as an inhibitor of dolomite, the use amount of the sodium humate is small, but the inhibition effect is high; and a chemicals adding mode of regrinding copper rough concentrates and then adding the sodium humate in concentration is adopted, selectivity of the inhibition effect can be improved, and influence to recycling of copper minerals is small. The flotation agent used in the mineral processing technology is non-toxic or has low toxicity, is environmentally friendly, and is easy to popularize and use.

The invention belongs to the field of high temperature materials, and in particular, relates to a solid heat storage material, and a preparation method and an application thereof. The solid heat storage material comprises the following raw materials in parts by weight: 5-95 parts of iron ore, 5-50 parts of magnesium iron bricks, 5-20 parts of iron scales, 5-20 parts of a silicon carbide dedusting powder, 1-20 parts of aluminum nitride, 1-5 parts of beryllium nitride, 0.5-5 parts of boron mud, 1-2.5 parts of sodium hexametaphosphate, 1-2 parts of a magnesium aluminum high temperature cementing agent and 1-4 parts of water. The material is low in cost and high in specific heat; and the value of the thermal conductivity coefficient is adjusted according to different ingredient ratios, so as to meet the requirements of different heat storage devices.

The invention discloses a method for utilizing carbonate type middle-low-grade phosphorite to manufacture phosphate concentrate, and the method comprises the following steps of: taking the carbonate type middle-low-grade phosphorite as a raw material; and crushing, roasting, digesting, carbonizing and separating to obtain the phosphate concentrate. The method disclosed by the invention can utilize the carbonate type middle-low-grade phosphorite to manufacture the phosphate concentrate and has the characteristics of simple process flow, easiness for operation of reaction, high phosphorus recycling rate and low content of magnesium oxide in the phosphate concentrate; and the invention provides an effective manner to utilize the carbonate-type middle-low-grade phosphorite.

The invention relates to a method for co-producing manganese hydroxide and sulfuric acid or ammonium sulfite with electrolytic manganese waste slag, comprising the following steps: A. slurrying electrolytic manganese metal waste slag, leaching, adjusting pH to 6.0-6.4, removing iron, and pressing filtration to obtain Press filter block A and press filter liquid A, press filter press block A after water washing, obtain press filter block B and press filter liquid B; Regulate the pH of press filter liquid A to 11.5-12, press filter, obtain press filter block C and press filter liquid C, press filtrate C circulation treatment, after potassium and sodium enrichment, remove calcium sulfate, evaporate and crystallize, separate potassium sulfate and sodium sulfate; B. calculate according to production needs and add the required substances to the press block B, dry Drying, pre-decomposition, and calcination to obtain cement additives or solids. The sulfur dioxide produced by calcination is separated from the dedusting ash for powder gas separation. The sulfur dioxide gas is used to make sulfuric acid. The dedusting ash and filter press block B are calcined together to enrich selenium and zinc; C. Slurry the filter block C, leaching, adjust the pH to 6.0-6.4, remove impurities, stand still, and press filter to obtain the filter block D and the filter liquid D, adjust the pH of the filter liquid D to 8.8-9, and continue to adjust the solution pH to 11.4‑11.8. This method realizes the joint output of multiple products.

The invention relates to a beneficiation method for separating copper-nickel sulfide ore from serpentine gangue. The beneficiation method comprises the following steps: when the copper-nickel sulfide ore is roughly concentrated, a polymer reagent poloxamer which can be adsorbed onto the surface of sulfide mineral through hydrophobic interaction but cannot be adsorbed onto the surface of the serpentine gangue is added; ore pulp is dispersed through the steric hindrance of the polymer reagent, the heterocoagulation of serpentine and sulfide minerals is eliminated, the inhibiting effect of serpentine on the sulfide minerals is reduced, and the recovery rate of rough concentration of the copper-nickel sulfide ore containing serpentine is increased; for rough copper-nickel sulfide concentrate obtained through rough concentration, regulators sodium pyrophosphate and carboxymethyl cellulose are added to further disperse and inhibit gangue minerals; meanwhile a collector is added before the regulators are added, so that the collector is adsorbed onto the surfaces of sulfide minerals to protect the sulfide minerals; the selective inhibition to the gangue minerals is realized, and therefore the concentrate grade is increased. The beneficiation method solves the problems that the reagent dosage is large, valuable minerals are inhibited and tailings hardly sedimentate in the traditional method.

The invention discloses a method for smelting laterite nickel ore in a blast furnace which can reduce the content of magnesia in slag. The method is to sieve the raw laterite nickel ore with a 25mm sieve first, and then crush and sieve the oversize material with a 25mm sieve. The sintered ore is sent to the blast furnace for smelting; in the blast furnace slag removal process, the steelmaking converter refining reduced slag is sprayed into the blast furnace slag for secondary slagging, and the injection amount of the steelmaking converter refining reducing slag is less than 1% of the mass of the blast furnace slag / 12. The invention effectively reduces the MgO content of the blast furnace slag from the original 16-20% to below 10%, can reduce the content of Cr2O3 and FeO, improves the desulfurization effect of the blast furnace, saves lime for steelmaking production, and reduces the production cost of the metallurgical process , to ensure the quality of molten steel, and at the same time, the blast furnace slag can be used in a large amount in the cement industry, with remarkable economic and social benefits.

The invention relates to a beneficiation method of copper-nickel sulfide ore. In the present invention, raw ores are sorted through two-stage grinding and flotation operations to obtain high-grade concentrates and two-stage copper-nickel mixed concentrates, the flotation tailings are subjected to magnetic separation and tailings, and the magnetic separation concentrates are re-selected. After grinding, the secondary magnetic separation is carried out to reduce magnesium and then enrich, and the secondary magnetic separation concentrate is subjected to strong collection flotation, and the obtained concentrate and the second-stage copper-nickel mixed concentrate are combined into a low-grade concentrate. The present invention creatively proposes a process of first-time magnetic separation of tailings, re-grinding and magnetic separation to reduce magnesium and re-enrichment, and strong collection of magnetic concentrate to improve metal recovery. Under the premise of ensuring the quality of low-grade concentrate, the process can be significantly improved. Improve nickel and copper recovery.

The invention discloses a method for reducing magnesium oxide in ferronickel slag and a method for preparing slag wool. In the process of making mineral wool from molten ferronickel slag, impregnated carbon is added during the slag discharge process of ferronickel smelting furnace, and the ferronickel slag is treated with impregnated carbon. During the transfer process, the molten nickel iron slag and the impregnated carbon are fully mixed and kept in a holding furnace to reduce the magnesium oxide content in the nickel iron slag; wherein, the preparation process of the impregnated carbon includes: fully mixing the calcium chloride aqueous solution with the carbonaceous material , and then perform solid-liquid separation and drying to obtain impregnated carbon; the amount of impregnated carbon used is determined according to the magnesium oxide content in the nickel-iron slag. The invention can reduce the magnesium oxide content in the ferronickel smelting slag, especially can reduce the magnesium oxide in the free state in the ferronickel smelting slag, is beneficial to improve the quality of slag wool, and is a great reduction in the ferronickel slag containing high magnesium oxide. And high-value utilization has created conditions, and can also realize the recovery of magnesium in nickel-iron slag.

The invention relates to a magnesium alloy graphene modifier and a preparation method and application thereof. The method is as follows: heating and melting magnesium in a crucible to obtain a magnesium melt; introducing air or a mixed gas formed by mixing oxygen and rare gas at the top of the crucible, and the volume content of oxygen in the mixed gas is 10-25%; Continuously feed CO into the magnesium melt for magnesia thermal reaction until the mass percentage of graphene generated in the magnesium melt is 0.1-10%, and a composite melt is obtained; a magnesia thermal reaction occurs between CO and the magnesium melt At the same time, make the temperature of the top of the crucible more than 300°C, and ignite the escaped CO that did not participate in the reaction at the top of the crucible; let the composite melt stand still, and then make it solidify to obtain a magnesium alloy graphene modifier. The invention effectively controls the content of magnesium oxide in the reaction product, can not only realize the grain refinement of the matrix magnesium, but also change the morphology of the eutectic structure, so that the casting can obtain ideal mechanical properties.

The invention belongs to the field of metal material, and relates to a preparation method of metal magnesium by magnesium-containing mineral and equipment adopted by the preparation method. The method comprises the following steps of: converting useful components in magnesium-containing mineral into high-activity magnesium oxide, and under the effects of high temperature and a catalytic midbody, enabling the high-activity magnesium oxide to have chlorination reaction with chlorine and carbon monoxide, so that molten magnesium chloride anhydrous is generated; and mixing the molten magnesium chloride anhydrous with the other molten inorganic salt according to a certain proportion to be taken as electrolyte, and leading the electrolyte into a multi-polarity electrolytic cell to electrolyze, so that the metal magnesium is prepared. The technology adopts the fluidzed chlorination bed and the multi-polarity electrolytic cell of the novel equipment, and adds the midbody of catalytic reaction in the process of chlorination, so that the preparation method is more high-efficiency and energy-saving compared with the conventional method. The waste gas and the waste residue generated in the whole process are treated to be reused, so that the preparation method and the equipment are environment-friendly.

The invention relates to a graphene-reinforced magnesium-based composite material and a preparation method thereof. The method is as follows: heating and melting the magnesium matrix in a crucible to obtain a magnesium matrix melt; introducing air or a mixed gas formed by mixing oxygen and rare gas at the top of the crucible; the magnesium matrix is ​​magnesium-zinc alloy, magnesium-calcium alloy, magnesium One or more of copper alloys and magnesium-zinc-calcium alloys; CO is continuously introduced into the magnesium matrix melt for gas-liquid in-situ reaction to obtain a graphene-enhanced alloy melt; when CO reacts with the magnesium matrix melt At the same time, ensure that the temperature of the top of the crucible is above 300° C., and ignite the escaped CO on the top of the crucible; solidify the graphene-reinforced alloy melt to obtain a graphene-reinforced magnesium-based composite material. The invention has the advantages of low cost and feasibility, simple operation and high operation safety factor. The invention obtains a graphene-reinforced magnesium-based composite material with low content of magnesium oxide, high dispersion of graphene with high volume fraction, high interface bonding strength and excellent mechanical properties.

The invention provides magnesium composite bentonite for pelletizing. The bentonite comprises the following components in percentage by weight: 20-30% of light-burned magnesite powder, 60-70% of bentonite, 3-5% of sodium carbonate, 2-3% of calcium ricinoleate and 3-5% of calcium chloride; the magnesium composite bentonite comprises the following main chemical components in percentage by weight: 25-30% of MgO, 45-55% of SiO2, and less than 15% of water. By adopting the magnesium composite bentonite disclosed by the invention, the MgO content of a pellet ore can be increased to 1.5%, the mechanical strength of the pellet ore can be increased by 1.5-2%, the initial softening temperature of the pellet ore can be increased by 150-200 DEG C, the MgO content of a sintering ore can be reduced relatively, the quality of the sintering ore can be improved, and the consumption of a sintering fuel can be reduced.

The invention relates to non-autoclaved aerated concrete prepared by utilizing lithium slag and nickel slag and a preparation method of the non-autoclaved aerated concrete. The aerated concrete is prepared from the following components in parts by weight: 40 to 80 parts of lithium slag powder, 20 to 60 parts of nickel slag powder, 6 to 20 parts of sodium hydroxide solution, 12 to 30 parts of sodium silicate solution, 0.005 to 0.05 part of aluminum powder, and 0.005 to 0.02 part of foam stabilizer. The preparation method comprises the steps of adding aluminum powder for foaming after uniformly stirring the lithium slag powder, nickel slag powder, sodium hydroxide solution, and sodium silicate solution in accordance with a certain proportion, cutting after curing for 4-6 hours at a temperature of 60 to 80 DEG C, stacking and curing for 7 days. The process is simple, industrial byproducts lithium slag and nickel slag are fully utilized, the high-temperature autoclave curing regime is not used in the whole process, the energy consumption is reduced, and the economic, environmental and social benefits are good.

The invention relates to a treatment method for electrolytic manganese metal waste residue, comprising the following steps: A. Grinding raw gypsum or drying gypsum stone; 6.4, iron removal, press filtration, obtain press filter block A and press filter liquid A, press filter press after the press filter block A washes, obtain press filter block B and press filter liquid B; Adjust the pH of press filter liquid A to 11.5-12, press filter , to obtain press filter block C and press filtrate C; C. add silica, calcium oxide, aluminum oxide, iron oxide to press filter block B, dry, pre-decompose, and calcinate to obtain cement clinker; D. press filter block C slurrying, leaching, adjusting the pH to 6.0-6.4, removing impurities, standing still, and press-filtering to obtain the press-filter block D and press-filtrate D, adding ammonia water to the press-filter D to adjust the pH to 8.8-9, and continuing to add ammonia solution to adjust the pH to 11.4‑11.8. The method realizes the recovery and reuse of resources.