643results about "Magnesium sulfates" patented technology

The invention relates to technology for treating fume pollutants and aims at providing a fume desulfurizing and denitrifying device based on magnesia and a method. The fume desulfurizing and denitrifying device based on the magnesia and the method are technically characterized in that SO2 is desorbed at the lower part of a desulfurizing and denitrifying tower by using magnesia slurry, a metal M2+ catalyst is added into circular absorption liquid, and air is also blown into the desulfurizing and denitrifying tower so as to quickly oxidize a desulfurized product of MgSO3 into MgSO4; ozone is introduced into the middle part of the desulfurizing and denitrifying tower so as to oxidize NO in fume into NOx; and the magnesia slurry is sprayed into the upper part of the tower, the NOx is absorbed, and magnesium nitrate is generated. Magnesium sulfate heptahydrate and magnesium nitrate hexahydrate can be respectively obtained by the conventional crystal separation of magnesium sulfate and the magnesium nitrate in the absorption liquid. According to the fume desulfurizing and denitrifying device based on the magnesia and the method, the desulfurizing and denitrifying procedures are finished in one tower by using the magnesia, and the recycle of the by-products of the SO2 and the NO is also realized. The fume desulfurizing and denitrifying device based on the magnesia and the method have simple desulfurizing and denitrifying processes, low investment, low resistance and low running cost. By adopting the fume desulfurizing and denitrifying device based on the magnesia and the method, the desulfurizing rate of more than 96 percent and the denitrifying rate of more than 92 percent can be obtained.

The invention provides a process for preparing magnesium sulphate by utilizing magnesium oxide desulfurized exhausted liquid comprising the steps of oxidation step, neutralization step, edulcoration step, evaporation concentration, solid-liquid separation step, drying and packing step. By controlling different evaporation temperature, discharging condition and various equipment, kieserite and magnesium sulphate can be prepared respectively.

The present invention is process of treating waste acid solution from Acesulfame potassium preparing sulfuric anhydride cyclizing process. The process of treating waste acid solution includes the reaction of the waste acid solution and the mixture comprising Mg(OH)2 or MgO and water in a neutralizing reactor to produce triethylamine gas, cooling triethylamine gas in a cooler into triethylamine liquid and collecting in a tank, regulating the pH value of neutralizing reaction resultant in a regulating tank with 98 % concentration sulfuric acid solution into 5-7, filtering, cooling the filtrate in a MgSO4 cooling reactor to separate out MgSO4 hydrate. The present invention has MgSO4 yield up to 95 % and N(C2H5)3 recovering rate up to 95 % and can eliminate environmental pollution caused by Acesulfame potassium production.

The invention discloses an integrated flue gas treatment device and method. The device comprises flue gas treatment equipment, ozone supply equipment, hydrogen peroxide supply equipment, evaporation and concentration equipment, cyclic sedimentation equipment and the like, wherein the flue gas treatment equipment comprises an ozone spray oxidation reaction layer, a hydrogen peroxide spray oxidation reaction layer, an absorber spray area, a slurry circulation area and a dust and mist removal area; both the ozone spray oxidation reaction layer and the hydrogen peroxide spray oxidation reaction layer are arranged in the absorber spray area; the dust and mist removal area is positioned above the absorber spray area; both the evaporation and concentration equipment and the cyclic sedimentation equipment are arranged in the flue gas treatment equipment. The device and the method disclosed by the invention are suitable for comprehensive treatment of flue gas containing SO2, NOX, Hg and dust and resource utilization of liquid waste in coal fired boilers, iron and steel sintering machines, pellets, industry kiln stoves and the like.

The invention discloses a method for concentrating waste sulfuric acid by utilizing waste heat of a titanium dioxide calcinator, comprising the following steps: at normal temperature and pressure, proper amount of water absorbent is added to titanium dioxide waste acid, liquid water is dissolved out in the form of solid crystal water through the water absorbent, filtrate after solid-liquid separation is cooled, iron vitriol in the solution is crystallized and dissolved out, and the acid liquid is further concentrated; the two steps are repeatedly carried out until the concentration of sulfuric acid in the final filtrate reaches more than 60%, and then the final filtrate is utilized in the acid hydrolysis procedure; and the water absorbent is dehydrated and dried to be regenerated by taking dustproof tail gas of the calcinator, and the steam generated in the drying and regeneration is cooled and flows back to technological process as washing water in titanic acid rinsing or is drained. The method provided by the invention solves the problems of more equipment, long flow and easy blockage in the existing technology, and the equipment investment and operating cost are reduced; and the water absorbent is recycled after being regenerated, so that the energy is saved, the consumption is reduced, and the efficiency is obvious; no wastewater, waste gases and residues are generated in the whole technology, the operability is strong, the productivity of equipment is high, the flow is simple, the investment is less, the cost is low, energy is saved, emission is reduced, and the benefit is obvious.

The present invention discloses a method for producing magnesium sulfate monohydrate by using desulfurization wastewater. The method comprises the following steps: (1) pulping, (2) carrying out desulfurization, (3) discharging the pulp, (4) filtering, (5) carrying out concentration, and (6) carrying out crystallization. With the method of the present invention, high value byproducts can be synchronously produced during a flue gas desulfurization process by using a magnesium oxide method. In addition, with the method of the present invention, a stable running characteristic is provided, and quality of the produced magnesium sulfate monohydrate after desulfurization reaches standards.

The invention relates to a method for producing a series of magnesia chemical products by using material containing magnesium. The method comprises the following steps: (1) crushing material (such asboric sludge, baudisserite and brucite) containing magnesium, calcining to obtain light calcinesia magnesia, and finely grinding or directly crushing and levigating the material containing (for example, soapstone) magnesium; (2) mixing the levigated materials containing magnesium with ammonium sulfate, and baking; (3) dissolving the baked product in water and filtering; (4) evaporating filtrate, concentrating and crystallizing to prepare magnesium sulfate; (5) dehydrating the magnesium sulfate, and calcining to prepare magnesium oxide; (6) mixing magnesium sulfate filtrate with an ammonium bicarbonate solution, and pyrolyzating to prepare basic magnesium carbonate; (7) adding ammonia water in a magnesium sulfate solution to prepare magnesium hydroxide; (8) carbonating and pyrolyzating themagnesium hydroxide to prepare high-purity basic magnesium carbonate; and (9) calcining magnesium hydroxide to prepare high-purity magnesium oxide. The high-purity magnesium oxide prepared by the method has high purity, good quality and high additional value, and the high-efficient and deep utility of the materials containing magnesium is realized. As byproducts, ammonia and ammonium sulfate are recycled, and the closed cycle is realized in the technological process which is an environment-firendly process flow. The method has simple process flow, less investment and easy realization of industrialized production.

A preparation method for hydrated basic magnesium sulfate crystal whisker with high-aspect ratio belongs to the technical field of inorganic chemical material preparation. The method comprises the following steps: water-soluble magnesium salt and inorganic base are taken as raw materials so as to prepare a precursor for nano magnesium hydroxide with better crystallinity and dispersivity in a substrate double-injection synthesis mode at a temperature between 10 and 90 DEG C; then the precursor is added into aqueous solution containing sulfate and micro chelated morphological control agent so as to carry out hydrothermal reaction at a temperature between 100 and 250 DEG C for 2 to 20 hours; and finally, one-dimensional growth of hydrothermal products is promoted by means of the selective adsorption and slow release action of the morphological control agent so as to prepare the hydrated basic magnesium sulfate crystal whisker with the average length of between 40 and 400mu m, the average diameter of between 0.05 and 0.2 mu m, the aspect ratio of between 200 and 2,000 and the main content more than 98 percent. The preparation method has the advantages of simple process, low cost, high added value of the product and easy industrial popularization; moreover, the product can be used in industries such as plastics, rubber, resin and ceramics as a reinforcing material.

Methods and apparatus for the production of low sodium lithium carbonate and lithium chloride from a brine concentrated to about 6.0 wt % lithium are disclosed. Methods and apparatus for direct recovery of technical grade lithium chloride from the concentrated brine are also disclosed.

The invention discloses a method for mining and machining a water-soluble potassium salt mine. The method disclosed by the invention comprises the following steps: firstly, exploiting the potassium salt mine by adopting a well drilling water soluble method; evaporating and crystallizing the exploited brine to sequentially precipitate a sodium salt and a potassium salt; refrigerating and crystallizing the residual feed liquid to further precipitate potassium chloride; and respectively filtering and drying the precipitated sodium salt and potassium salt to obtain finished sodium salt and potassium salt, wherein a part of mother liquor after the sodium salt and potassium salt are precipitated is used for preparing magnesium chloride, and the other part is used for preparing magnesium oxide. The method disclosed by the invention is particularly suitable for the exploitation of a potassium mine having the defects of complicated geological and hydrologic conditions, over-shallow or over-deep burial, poor quality and high carnallite content, can reduce ground collapse, improves the exploitation rate, can prepare a potassium fertilizer in a large scale and has the advantages of low energy consumption and little pollution and waste discharge.

A process for preparing magnesium sulfate, magnesium carbonate and magnesium hydroxide from magnesite includes reaction of light-burned magnesium oxide powder obtained by calcining magnesite, the solution of ammonium sulfate as the by-product obtained by reaction with magnesium carbonate and magnesium hydroxide precipitate and industrial concentrated sulfuric acid, evaporating ammonia gas, dissolving in water, depositing to obtain magnesium hydroxide, controlling acidity and temp. filtering to remove impurities, cooling crystallizing to obtain magnesium sulfate heptahydrate, diluting the mother liquid, preparing alkaline magnetic carbonate by ammonium hydrogen carbonate method, and sulfuric acid absorption to residual ammonia water to obtain ammonium sulfate as by-product. Its advantage is no generation of gas and liquid pollutants.

The invention discloses a method for using brine to produce sodium chloride and heptahydrate magnesium sulfate, comprising the steps that: (1) brine is taken as a raw material, the molar ratio of SO4<2->:Mg<2+> in the brine is 0.1-0.8, and the molar ratio of SO4<2->:Na<+> is 0.025-1; and the pressure is decreased for boiling evaporation, the pressure is controlled to make the boiling temperature be 75 DEG C to 50 DEG C after the evaporation, and the molar ratio of SO4<2>:Na<+> in the solution is 0.4-2.5; (2) solid-liquid separation is implemented, and the solid phase is washed with saturated sodium chloride aqueous solution and is then dried for obtaining the sodium chloride; (3) a mother liquid of salt production is added with water to prepare a mixture; (4) the mixture is cooled and guided into a crystallizer, then crystals are separated out; and (5) solid-liquid separation is carried out for obtaining a crude product having a solid phase of heptahydrate magnesium sulfate. The method has advantages of simple equipment, simple process, complete separation of sodium chloride, high purity and yield of heptahydrate magnesium sulfate, having no miscellaneous salt removing link in the process, and realizable joint production of sodium chloride and heptahydrate magnesium sulfate.

The invention relates to a comprehensive utilization method for separating, concentrating and purifying manganese sulfate, magnesium sulfate and calcium sulfate in high-salt waste water. The method is characterized by comprising the following steps of maintaining the temperature of mother liquor of waste water at 50DEG C to 60DEG C, utilizing ammonia water or liquid ammonia to adjust the pH value of the waste water to 10 to 1.5, collecting separating manganese ions and magnesium ions in the waste water in a form of manganese hydroxide and magnesium hydroxide, adding sulfuric acid into the separated manganese hydroxide and magnesium hydroxide to prepare a manganese sulfate solution and a magnesium sulfate solution, and adopting a segmented evaporation crystallization method to realize the separation to produce manganese sulfate monohydrate and magnesium sulfate hexahydrate; adding lime milk into the waste water after the manganese hydroxide and magnesium hydroxide are separated to adjust the pH value, crystallizing calcium sulfate, precipitating the calcium sulfate, and press filtering the calcium sulfate to produce calcium sulphate dehydrate. After being treated by utilizing the method, the waste water can reach the emission standard and can be externally discharged or recycled by the enterprise, and solid wastes in the waste water can be completely recycled. The investment is low, and the annual net investment return rate is more than 15 percent.

The invention relates to a method for producing industrial-grade magnesium sulfate by using titanium white waste acid. According to the method, the titanium white waste acid is purified by using a manner of preparing acid and concentrating, so that the influence of salts such as ferrous sulfate in the titanium white waste acid on preparation of industrial-grade magnesium sulfate heptahydrate is reduced; purified and concentrated acid reacts with caustic-burned magnesia powder; the purification treatment is carried out by adjusting pH value by using acetylene sludge or lime milk; impurities in the magnesium sulfate can be effectively removed by using a manner of oxidizing by using hydrogen peroxide and re-adjusting the pH value by using pure sulfuric acid under alkaline conditions; the titanium white waste acid is used for preparing acid and concentrating so as to react with the caustic-burned magnesia powder, so that the concentration process for preparing magnesium sulfate by using titanium white waste acid is cancelled, the application range of the titanium white waste acid is expanded; and the method for producing industrial-grade magnesium sulfate by using titanium white waste acid is simple in production process, small in investment, low in cost, high in yield and high in product purity. The overall process is free of waste and byproduct, remarkable in social benefit and great in economic benefit.

The invention discloses a method for preparing magnesium sulfate and a magnesium silico calcium sulfur fertilizer by utilizing alkylated waste sulfuric acid. The method comprises the steps of consuming sulfuric acid by producing magnesium sulfate, adsorbing and separating acid-soluble oil waste residues by virtue of suspended matters of silicon, calcium and the like in a mineral powder, calcining the waste residues by virtue of an external heat source with the assistance of the heat of oil-containing residues and the heat of waste activated carbon, carbonizing an organic matter, and preparing the fertilizer containing magnesium silico calcium sulfur. The method has the beneficial effects that the method is simple in process and easy to operate, is easy to implement, is little in equipment investment, is low in the cost, is large in the market need for the magnesium silico calcium sulfur fertilizer as a by-product and is remarkable in the economic and social benefits without secondary pollution. With the adoption of the method, all resources are used in an optimization way, so that the method is an ideal process for treating the alkylated waste sulfuric acid with low cost.

The present invention resides in a process of recovering nickel and cobalt, regenerating the main raw materials, said process including the steps of: granulometric separation; leaching; neutralization; MHP production in only one stage and the pressure crystallization of magnesium sulphite.

The process proposes a way to recovery nickel and cobalt from laterite ores through the atmospheric and heap leaching with staged addition of ore—by size separation—and H₂SO₄, decreasing the nickel losses and simplifying the neutralization circuit and producing a more purified MHP.

The present process route is employed for nickel extraction, including the one from high magnesium containing lateritic ores.

A stabilizing agent for peroxide-bleaching procedure includes (A) a component including a homopolymer or copolymer of alpha -hydroxyacrylic acid or water soluble salt or polylactone of the homo- or co-polymer, (B) a component including a homopolymer or copolymer of acrylic acid, methacrylic acid and/or maleic acid and water-soluble salt of the homo- or co-polymer, (C) a component including DTPA, TTHA or water-soluble salt thereof and optionally (D) a component including a water-soluble inorganic Mg salt and is used to pretreat a fiber material with a pretreating liquid containing the stabilizing agent before bleaching with peroxide, or to bleach the fiber material by a bleaching liquid containing a peroxide bleaching agent and the stabilizing agent.

The invention relates to a boiler flue gas desulfurization and dust removal system and energy-saving comprehensive utilization technology, which avoid secondary pollution and resource waste. The boiler flue gas desulfurization and dust removal system comprises a pre-washer for reducing the temperature and increasing the humidity for flue gas, wherein the flue gas after pretreatment and fly ash removal enters an absorption tower, and contacts circulatory serum in the absorption tower, and SO2 in the flue gas reacts with an absorbent so as to be removed from the flue gas; and the flue gas after desulfurization is exhausted out from an exhaust pipe. The SO2 in the flue gas treated by the system reacts with the absorbent so as to be removed from the flue gas; the partial serum can be recycled through aftertreatment; and the flue gas after desulfurization is exhausted out from the exhaust pipe and does not have harm to the environment.

The invention discloses a seawater desalination, resource comprehensive utilization and zero discharge processing system. The system comprises an ultrafiltration (UF) system, a seawater reverse osmosis (SWRO) system, a deionized water processing system, namely an UPW system, a mechanical compression system capable of preventing scaling and a salt manufacturing and salt chemical engineering system, wherein the UF system is used for generating pure seawater; the SWRO system is used for generating desalted water and concentrated seawater; the concentrated seawater can be produced into calcium sulfate, sodium chloride, potassium chloride, magnesium sulfate, bromine, magnesium chloride and steam condensed water by virtue of the mechanical compression system and the salt manufacturing and salt chemical engineering system; and the steam condensed water and a part of desalted water flow into the UPW system to generate deionized water. According to the processing system, the relevant projects of seawater desalination, energy source utilization, industrial salt manufacturing and salt chemical engineering are organically combined, so that reasonable allocation and utilization of resources are realized, and the aims of energy conservation, emission reduction, circular economy and zero discharge are fulfilled.