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

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 discloses a method for extracting phosphate concentrate from phosphate tailings and cooperatively producing calcium carbonate and magnesium oxide. First, phosphate tailings are calcined under high temperature, hot water is added into the calcined material for digestion treatment, an ammonium nitrate solution is added to the calcined material, the mixture is stirred, calcium is extracted under a certain temperature, calcium-containing leaching liquid and leaching residues are obtained, phosphate concentrate and magnesium-containing leaching liquid are obtained after magnesium is extracted from the leaching residues with an ammonium sulfate solution, calcium carbonate is obtained after the calcium-containing leaching liquid is precipitated by an ammonium carbonate solution, magnesium carbonate is obtained after the magnesium-containing leaching liquid is precipitated by an ammonium carbonate solution, and magnesium oxide is obtained after the magnesium carbonate is calcined. According to the method, phosphate concentrate, calcium carbonate and magnesium oxide are prepared with phosphate tailings as the main raw materials, large-scale treatment can be carried out on the phosphate tailings, the problem that because phosphate tailings pile up in quantity, the phosphate tailings occupy a lot of land and pollute the environment is solved, and the products of phosphate concentrate, calcium carbonate and magnesium oxide are obtained.

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 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 discloses a method for extracting phosphate concentrate from phosphate tailings and cooperatively producing calcium ammonium nitrate and magnesium ammonium sulphate. Phosphate tailings are calcined under high temperature, hot water is added into the calcined material for digestion treatment, an ammonium nitrate solution is added to the calcined material, the mixture is stirred, calcium is extracted under a certain temperature, calcium-containing leaching liquid and leaching residues are obtained, phosphate concentrate and magnesium-containing leaching liquid are obtained after magnesium is extracted from the leaching residues with an ammonium sulfate solution, and calcium ammonium nitrate and magnesium ammonium sulphate are obtained after the calcium-containing leaching liquid and the magnesium-containing leaching liquid are concentrated and dried. According to the method, phosphate concentrate, calcium ammonium nitrate and magnesium ammonium sulphate are prepared with phosphate tailings as the main raw materials, large-scale treatment can be carried out on the phosphate tailings, the problem that because phosphate tailings pile up in quantity, the phosphate tailings occupy a lot of land and pollute the environment is solved, and the obtained phosphate concentrate, calcium ammonium nitrate and magnesium ammonium sulphate can bring certain economic interests.

The invention relates to a method for improving the flotation recovery rate of copper and nickel and reducing content of magnesium oxide in concentrates of copper-nickel sulfide ores. According to the method, before the copper-nickel sulfide ores are subjected to flotation, ultrasonic waves are used for carrying out dispersion treatment on ore pulp. The ore pulp can be crude ore pulp added with a collecting agent, or ore pulp which comprises the collecting agent and enters a random flotation operation; the ultrasonication can be carried out before flotation and also can be simultaneously carried out with flotation. According to the invention, supersonic jet generated in the ultrasonic treatment and cavatition are utilized to desorb serpentine pulp covering the surface of sulphide mineral, the flotation recovery rate of the sulphide mineral is improved, the quantity of the serpentine pulp entering the concentrates is reduced and the content of magnesium oxide in the concentrates of the copper-nickel sulfide ores is reduced, so that a sorting index is improved.

The invention relates to a method for preparing anhydrous magnesium chloride by utilizing magnesium oxide. The method comprises the following steps of: (1) mixing magnesium oxide and ammonium chloride uniformly to obtain a mixture of the magnesium oxide and the ammonium chloride; and (2) placing a covering above the mixture, heating and reacting to obtain the anhydrous magnesium chloride. In the anhydrous magnesium chloride prepared by the method, the content of the magnesium oxide is within 0.5 weight percent, so the anhydrous magnesium chloride can be used for producing magnesium by an electrolytic process directly. By the method for preparing the anhydrous magnesium chloride, the production process of the anhydrous magnesium chloride can be shortened, the production efficiency can be improved, the production cost can be reduced, and the environment-friendly investment cost can be reduced.

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 relates to a treatment method of electrolytic manganese metal waste residues. The treatment method comprises the following steps: A, grinding gypsum or drying calcined gypsum and then grinding to obtain gypsum powder; B, slurrying the electrolytic manganese metal waste residues, leaching, and adding the gypsum powder; adjusting the pH of a solution to 6.0-6.4, removing iron, carryingout filter pressing to obtain a filter pressing block A and a filter pressing solution A, washing the filter pressing block A with water, and then carrying out filter pressing to obtain a filter pressing block B and a filter pressing solution B; adjusting the pH of the filter pressing solution A to 11.5-12, and carrying out filter pressing to obtain a filter pressing block C and a filter pressingsolution C; C, adding silicon dioxide, calcium oxide, aluminum oxide and iron oxide into the filter pressing block B, drying, pre-decomposing, and calcining to obtain cement clinker; D, slurrying thefilter pressing block C, leaching, adjusting the pH to 6.0-6.4, removing impurities, standing, and carrying out filter pressing to obtain a filter pressing block D and a filter pressing solution D, adding ammonia water into the filter pressing solution D to adjust the pH to 8.8-9, and continuously adding an ammonia water solution to adjust the pH to 11.4-11.8. The method realizes recycling of resources.

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 discloses magnesium phosphate cement containing a C4AF solid solution and a preparation method thereof. The magnesium phosphate cement is prepared from the following raw materials in parts by weight: 30-40 parts of the C4AF solid solution, 40-50 parts of MgO, 15-20 parts of phosphate, 0-5 parts of boric oxide or 5-10 parts of borax. The composition range of the final mineral phase of the cement is determined, corresponding minerals can be directly combined for preparation, the C4AF solid solution and the intermediate component of MgO can be prepared by adopting a high-temperature mode, and finally, the intermediate component is prepared with a proper amount of phosphate and a boron-containing substance. The cement composition can endow the magnesium phosphate cement with excellent hydration hardening performance, and the water resistance can be greatly improved. Meanwhile, the source of raw materials needed for preparing the C4AF solid solution is wide, the requirement of magnesium phosphate cement for dead-burned MgO is reduced, and carbon peak reaching/carbon neutralization can be achieved easily.

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 discloses a production system for reducing magnesium content in nickel concentrate. The production system comprises a concentrate elevator, a concentrate quantitative stock bin, a magnesium reduction reactor, a thickener, a supernatant tank, a filter press, a filtrate storage tank, a magnesium-reduced liquid tank and a waste gas absorption tower. A production method comprises the following steps: (1) material adding; (2) material input; (3) steam introduction; (4) material reaction; (5) material discharge; and (6) material reuse. By introducing a high-concentration SO2 reduction environment in smelting flue gas, the reaction potential of acidic wastewater and the concentrate is controlled, the content of magnesium oxide in the concentrate is selectively reduced, and the leaching rate of valuable metals such as nickel, copper and cobalt in the concentrate is reduced to the maximum extent.

The invention discloses a method for reducing magnesium oxide in ferronickel slag and a method for preparing mineral wool. In the process of preparing mineral wool by using molten ferronickel slag, impregnated carbon is added in the slagging process of a ferronickel smelting furnace, the molten ferronickel slag and the impregnated carbon are fully mixed in the transfer process of the ferronickel slag, and heat preservation is carried out in a heat preservation furnace, so that the content of magnesium oxide in the ferronickel slag is reduced; wherein the impregnated carbon preparation processcomprises the following steps: fully mixing a calcium chloride aqueous solution with a carbonaceous material, and then carrying out solid-liquid separation and drying to obtain impregnated carbon; andthe usage amount of the impregnated carbon is determined according to the content of magnesium oxide in the ferronickel slag. According to the method, the content of magnesium oxide in the ferronickel smelting slag can be reduced, particularly, magnesium oxide in a free state in the ferronickel smelting slag can be reduced, the quality of slag wool can be improved, conditions are created for large reduction and high-value utilization of the ferronickel slag containing high magnesium oxide, and recovery of magnesium in the ferronickel slag can also be achieved.