129results about "Magnesium sulfates" patented technology

The invention discloses a method for comprehensively recovering silicon and magnesium based on rotary kiln-electric furnace type ferronickel slag. The method comprises the following steps: carrying out ball milling, leaching and solid-liquid separation on the rotary kiln-electric furnace type ferronickel slag, standing supersaturated silicon in a leaching solution at normal temperature to generate a gel phenomenon, stirring and crushing to obtain a mixed phase of a magnesium sulfate solution and a silica gel block, and separating the gel solution to obtain a magnesium sulfate crude solution and wet crude silica gel; preparing high-purity hydrated magnesium sulfate with the purity of 99.9% from the magnesium sulfate crude liquid through processes of purification, crystallization and the like; the wet coarse silica gel is subjected to further alkali dissolution, gel forming and other processes to produce silica gel with the purity of 99%; the method has the advantages of low energy consumption, high product added value and element recovery rate and convenience in industrialization, and has excellent popularization and application prospects.

The present application pertains to processes for making calcium oxide and / or sulfuric acid from calcium sulfate. In some embodiments the processes comprise reacting a component comprising calcium sulfate with a second component comprising magnesium sulfite under conditions to form a solid comprising calcium sulfite and a solution comprising magnesium sulfate. Next, at least a portion of the solid comprising calcium sulfite is decomposed to form a second solid comprising calcium oxide, or calcium hydroxide, or cement, or clinker, or any combination thereof.

The invention relates to the technical field of preparation of magnesium sulfate heptahydrate, in particular to a method for preparing magnesium sulfate heptahydrate from magnesite flotation tailings, which comprises the following steps: 1) crushing the magnesite flotation tailings until the granularity is less than or equal to 0.074 mm to obtain tailings powder; 2) mixing and stirring the tailing powder and sulfuric acid, and then filtering to obtain a crude magnesium sulfate solution; 3) adding sodium hydroxide into the crude magnesium sulfate solution, adjusting the pH value of the solution to 6, and filtering; 4) concentrating the concentration of magnesium sulfate to 30%-40%; (5) cooling the concentrated solution to 0-10 DEG C, and controlling the cooling speed to be 1-5 DEG C / h, so that magnesium sulfate heptahydrate is fully crystallized and separated out; 6) filtering the crystallized mixture, and separating out magnesium sulfate heptahydrate crystals; and 7) finally drying the filtered magnesium sulfate heptahydrate crystal to obtain a magnesium sulfate heptahydrate finished product. According to the method, high-purity magnesium sulfate heptahydrate can be obtained, so that the influence of tailings on the environment is solved.

The invention relates to the field of preparation of battery materials and precursors of the battery materials, and discloses a method for efficiently preparing battery-grade manganous-manganic oxide by using electrolytic manganese residue leachate and a harmless treatment method for tail liquid of the battery-grade manganous-manganic oxide. Treating the manganese residue leachate concentrated water obtained in the previous step with ammonia water and oxygen to prepare battery-grade manganous-manganic oxide; adjusting the pH value of the filtrate obtained in the previous step to prepare magnesium hydroxide; the filtrate obtained in the previous step is subjected to evaporative crystallization, ammonium sulfate is prepared, finally, harmless treatment of preparation of battery-grade manganous-manganic oxide from the manganese residue leachate and the tail liquid of the battery-grade manganous-manganic oxide is achieved, and the recovery efficiency of valuable components is greatly improved.

The invention belongs to the technical field of waste battery recovery, and particularly relates to a short-process method for recovering battery-grade lithium carbonate and valuable metals from waste ternary lithium battery black powder. According to the method, a lithium closed-loop technical system of blank roasting, cyclic leaching, synergistic impurity removal, lithium phosphate aluminum removal, directional extraction and split-flow extraction of lithium, nickel and magnesium and seed crystal induction parallel flow lithium precipitation is constructed, a roasting aid, a reducing agent and an aluminum removal agent do not need to be added in the whole process, and the redundant processes of traditional lithium carbonate purification such as carbonization, resin purification and pyrolysis are omitted; the lithium liquid concentration cost is saved, no hazardous waste exists, green and clean production is achieved, and the quality of battery-grade products is guaranteed through collaborative impurity removal and directional extraction.

The embodiment of the invention discloses an efficient utilization method of copper-iron sulfide ore. The method comprises the following steps: S1, mixing the copper-iron sulfide ore with magnesium oxide to obtain a mixed material; s2, heating the mixed material to a set temperature in an air or oxygen atmosphere for roasting, and collecting sulfur dioxide gas in tail gas by using a magnesium hydroxide solution to obtain magnesium sulfate; collecting a roasted solid-phase product; s3, washing the roasted solid-phase product with water to obtain a copper-iron oxide intermediate product; and S4, the copper-iron oxide intermediate product is reduced in the hydrogen atmosphere, and a copper and iron elementary substance mixture or a copper-iron alloy is obtained. The process flow is simplified, the energy consumption is low, the controllability of hydrogen reduction and the synergistic extraction of copper and iron resources are realized, the emission of a large amount of sulfur dioxide in the traditional pyrogenic process is avoided, and the method has remarkable environmental protection and economic benefits.

A recovery system for preparing magnesium sulfate using sulfuric acid waste liquid is provided. [Solution] The recovery system for preparing magnesium sulfate using sulfuric acid waste liquor according to the present invention comprises a reactor 1, a crystallizer 3, a dehydrator 4, and a dryer 5. The reactor 1 removes hydrogen peroxide from the sulfuric acid waste liquor and produces a magnesium sulfate solution. The crystallizer 3 continuously recrystallizes the magnesium sulfate solution by lowering its temperature, obtaining magnesium sulfate crystals and their mother liquor. The dehydrator 4 removes the mother liquor, and the dryer 5 dries the solution at different temperatures to obtain magnesium sulfate hydrates containing different amounts of water of crystallization.

The present invention relates to a process for producing salts from brine obtained from the desalination of seawater. The process can also make it possible to selectively recover NaCl, CaSO4, kainite, carnallite, magnesium sulfate, struvite, newberyite, or potassium bitartrate.

The application provides a method for separating magnesium and lithium in brine, comprising the following steps: pretreating the brine to obtain pretreated brine; performing primary nanofiltration, secondary nanofiltration and reverse osmosis concentration on the pretreated brine; the nanofiltration membrane selected for the primary nanofiltration is a carboxylated MOF modified nanofiltration membrane; and the raw materials for preparing the carboxylated modified nanofiltration membrane comprise a support, piperazine, carboxylated ZiF-8 and carboxylated Uio-66. The application reduces the risk of nanofiltration membrane pollution by pretreating the brine, pumps the pretreated brine into a nanofiltration system, generates a cut-off liquid rich in magnesium and sulfate ions and a high-lithium permeate liquid, performs secondary nanofiltration on the cut-off liquid to recover lithium, the secondary cut-off liquid can be used as a resource, the permeate liquid enters a reverse osmosis membrane, the lithium content is concentrated, the concentrated lithium liquid enters a lithium precipitation process, and the method for separating magnesium and lithium in the nanofiltration process realizes the impurity removal process for lithium recovery.

The present invention provides a method for recovering and preparing high-purity magnesium fluoride from fluorine-containing solid waste, comprising: mixing the fluorine-containing solid waste with magnesium sulfate and then performing a wet ball milling process, putting the obtained wet-milled conversion residue into a sodium hydroxide solution for alkali leaching and then filtering to obtain an alkali-leached conversion residue and an alkali-leached conversion solution; performing acid leaching on the alkali-leached conversion residue to obtain an acid leached solution, performing a magnesium ultrasonic extraction process on the acid leached solution, and performing a magnesium ultrasonic back extraction process on the obtained magnesium-loaded organic phase to obtain a magnesium-free organic phase and a magnesium sulfate solution; acidifying the alkali-leached conversion solution and then filtering to obtain an acidified solution, performing a fluorine extraction process on the acidified solution to obtain a fluorine-loaded organic phase, and using the magnesium sulfate solution as an anti-extraction agent to perform a fluorine back extraction process on the fluorine-loaded organic phase to obtain magnesium fluoride. The method adopted by the present invention can efficiently separate calcium and magnesium in the fluorine-containing solid waste, convert the fluorides in the fluorine-containing solid waste into high-purity magnesium fluoride, and realize the recycling of fluorine and magnesium resources in the fluorine-containing solid waste.

The application belongs to the technical field of wastewater treatment, and particularly relates to a method for separating inorganic salts in a sodium-magnesium sulfate mixed solution. A magnesium salt with relatively large solubility is added to a feed liquid containing sodium-magnesium sulfate, and magnesium sulfate heptahydrate is precipitated at normal temperature and low temperature, respectively, and sodium salt is precipitated at high temperature in the heating and evaporation process, thereby forming a continuous zero-emission disposal sodium-magnesium sulfate separation process. The process has strong universality, is suitable for an aqueous solution system with a mass ratio of magnesium sulfate to sodium sulfate of 1-4, has zero emission in the process, does not pollute the environment, and is an environmentally friendly new technology for separating sodium-magnesium sulfate.

The application provides a magnesium sulfate solution impurity removal device, and belongs to the technical field of magnesium sulfate production. The device comprises an impurity removal box body, a driving assembly, filter cartridges, a flushing assembly, a pushing assembly, a collecting assembly and a lifting assembly. The filter cartridges are arranged in groups, and are annularly distributed inside the impurity removal box body. The filter cartridges are sequentially attached to each other. Filter holes are evenly arranged on the cylinder body of each group of filter cartridges. The flushing assembly is arranged above the filter cartridges. The collecting assembly is arranged below the filter cartridges and corresponds to the flushing assembly. The lifting assembly is arranged at the bottom of the inside of the impurity removal box body. Compared with the prior art, the magnesium sulfate solution can be automatically and on-line cleaned and collected when the magnesium sulfate solution is filtered and impurities are removed, thereby improving the filtering and impurity removal efficiency of the magnesium sulfate solution.

According to the technical scheme, the method is characterized by comprising the following steps: S1, pretreatment of the extraction liquid: mixing saline water containing target solute magnesium sulfate with a tributyl phosphate extraction agent according to a volume ratio of 1: (0.8-1.2), and stirring and extracting at 35-45 DEG C for 20-30 minutes to form the extraction liquid; 0.5 wt%-1.2 wt% of a dielectric conditioning agent is added into the extraction agent; s2, gradient cooling crystallization: adopting a three-stage cooling process; s3, solid-liquid separation and solvent recovery; crystal growth lasts for 20-30 minutes; and S4, intelligent temperature control feedback. Compared with a traditional evaporation method, the technology has the advantages that the concentration period is shortened by 30-40%, and the unit energy consumption is reduced by 25-30. By utilizing the process, the purity can be improved: the purity of a target solute is improved from 96.5% in the prior art to 99.2% or above, and the impurity content is reduced by 60% or above. Crystal growth lasts for 20-30 minutes; economic optimization can be realized by utilizing the process.

Methods for immobilizing carbon dioxide and producing stabilized amorphous alkaline earth metal carbonates are provided.

The utility model relates to the technical field of waste resin regeneration, and particularly provides a co-production device for preparing activated carbon from waste resin and recycling waste sulfuric acid, which comprises a resin activation system and a sulfuric acid regeneration system. The method has the beneficial effects that a novel method for preparing the activated carbon from the waste resin is provided; a sulfuric acid regeneration system is matched, so that heat energy and sulfur-containing gas generated during preparation of the waste resin are effectively utilized; low-quality acid generated in the sulfuric acid regeneration process is fully utilized through a matched salt manufacturing system. And no acid gas is discharged in the whole process.

In some embodiments the application pertains to processes comprising reacting a component comprising an alkaline earth weak acid with a component comprising an acid to form a component comprising an alkaline earth acid anion and a component comprising a weak acid derivative. At least a portion of the component comprising the alkaline earth acid anion is reacted with a component comprising an alkali sulfate to form a component comprising alkaline earth sulfate and a component comprising an alkali acid anion. At least a portion of the component comprising alkaline earth sulfate is decomposed to form a component comprising alkaline earth oxide, or alkaline earth hydroxide, or alkaline earth carbonate, or alkaline earth sulfide, or a derivative thereof, or any combination thereof, and a component comprising sulfur dioxide, or oxygen, or sulfur trioxide, or a derivative thereof, or any combination thereof.

The application provides a recycling method of laterite nickel ore hydrometallurgy wastewater, which comprises the following steps: the laterite nickel ore is sequentially subjected to high-pressure acid leaching, cyclic leaching, CCD washing, iron and aluminum removal treatment, MHP precipitation treatment and manganese precipitation treatment to obtain post-manganese precipitation wastewater; the post-manganese precipitation wastewater is subjected to ion exchange to obtain post-ion exchange liquid and nickel and cobalt enriched solution; the nickel and cobalt enriched solution is recycled to the CCD washing; the post-ion exchange liquid is subjected to magnesium separation to obtain magnesium rich liquid and magnesium poor liquid; the magnesium rich liquid is recycled to the MHP precipitation treatment, and / or the magnesium rich liquid is subjected to crystallization to obtain magnesium sulfate product; the magnesium poor liquid is subjected to bipolar membrane electrolysis to obtain sodium hydroxide solution and sulfuric acid solution; the sodium hydroxide solution is recycled to the iron and aluminum removal treatment, and the sulfuric acid solution is recycled to the cyclic leaching. The application can realize full utilization of wastewater resources, is green, environmentally friendly and economical, and has wide application prospect.

The utility model relates to the technical field of magnesium sulfate purification equipment, in particular to a continuous extraction type magnesium sulfate calcium removal device, which is provided with an extraction device and a water bath device, removes calcium from magnesium sulfate in an anhydrous alcohol continuous extraction manner, and reduces the requirement on a reaction container and the production risk. Comprising a body; the extraction device, the water bath device, the water replenishing device and the extraction device are all mounted on the machine body, and the guide-out device is mounted on the extraction device; the machine body provides support, the extraction device performs continuous extraction on magnesium sulfate, the water bath device performs water bath heating on the extraction device, the water supplementing device supplements water to the water bath device, the extraction device extracts magnesium sulfate in alcohol, and the guiding device is convenient for discharging residual calcium impurities in the extraction device.

The present invention discloses a system and method for post-processing phosphate purification by ion exchange. In this system, the bottom outlet of a calcium sulfate crystallization tank is connected to the feed end of a calcium sulfate filter, the side outlet of the calcium sulfate crystallization tank is connected to the top inlet B of a magnesium sulfate crystallization tank, and the bottom outlet of the magnesium sulfate crystallization tank is connected to the feed end of a magnesium sulfate filter. Calcium sulfate from the calcium and magnesium washing solution of the ion exchange phosphate purification system is crystallized in the calcium sulfate crystallization tank. The calcium sulfate crystals in the calcium sulfate crystallization tank are filtered and separated by a calcium sulfate filter. The solution in the calcium sulfate crystallization tank is crystallized in a magnesium sulfate crystallization tank. The magnesium sulfate crystals are filtered and separated by a magnesium sulfate filter. Using the above system and method, industrial salts such as calcium sulfate and magnesium sulfate are recovered to remove the boundary area. The recovered dilute sulfuric acid is used in a deionized exchange phosphate purification system and in a deionized exchange phosphate purification resin regeneration system. This patent aims to save energy and reduce consumption, reduce carbon emissions from production equipment, and reduce operating and maintenance costs.

The invention discloses a method and a system for purifying a magnesium sulfate solution. The method comprises the following steps: pretreating a magnesium sulfate solution containing nickel and cobalt impurities to remove suspended matters and organic matters in the magnesium sulfate solution; adding sodium hydrosulfide into the pretreated magnesium sulfate solution, enabling nickel and cobalt to respectively react with the sodium hydrosulfide to generate precipitates, and carrying out solid-liquid separation to obtain the purified magnesium sulfate solution and precipitates containing nickel sulfide and cobalt sulfide; evaporating and crystallizing the purified magnesium sulfate solution to obtain magnesium sulfate crystals, and drying to obtain a magnesium sulfate product; and carrying out post-treatment on the precipitate containing the nickel sulfide and the cobalt sulfide, and recovering nickel and cobalt in the precipitate. The method can efficiently remove nickel and cobalt impurities in the magnesium sulfate solution, has the advantages of high efficiency, environmental protection, recoverable resources and the like, and can reduce the production cost and improve the resource utilization rate.

The present disclosure relates to the scalable synthesis of novel coating materials, including hierarchical coating frameworks, on recyclable templates and using recyclable process liquids. Using these methods, three-dimensional architectures constructed from two-dimensional molecular structures can be produced economically with reduced waste.

The invention discloses a magnesium sulfate separation and refining purification method, which belongs to the technical field of comprehensive utilization of sea brine, and comprises the following steps: (1) uniformly mixing a solid mixture containing magnesium sulfate and sodium chloride obtained by evaporating bittern with a dissolving solution according to a weight ratio of 0.8: (1-1.5) at 60-100 DEG C to obtain a mixed suspension, and controlling the solid-to-liquid ratio of the mixed suspension to be 40-60%; (2) pumping the 60-100 DEG C mixed suspension into a cone flange centrifuge, discharging magnesium sulfate and mother liquor with the particle size smaller than the aperture of a screen from a liquid outlet after penetrating through the screen to obtain crude magnesium milk, throwing out sodium chloride with the particle size larger than the aperture of the screen from a large section of a conical rotary drum, and discharging from a solid material port to obtain crude salt; (3) performing secondary centrifugal separation on the crude salt to obtain refined salt with the water content reduced to 20-30% and mother liquor; and (4) continuously carrying out three-stage centrifugal separation on the crude magnesium milk obtained in the step (2) at 60-100 DEG C to obtain magnesium sulfate slurry, and reducing the water content of the magnesium sulfate slurry to 20-30% to obtain the magnesium milk. According to the method, the content of MgSO4 in the magnesium sulfate monohydrate product can be effectively increased, and the content of NaCl can be reduced.

The invention belongs to the technical field of wastewater treatment, and particularly relates to an emission reduction method for disperse dye production wastewater. The method comprises the following steps: neutralizing disperse dye mother liquor with industrial magnesium oxide, magnesium hydroxide or magnesium carbonate, and filtering to obtain clarified and neutralized mother liquor containing magnesium sulfate; using the neutralized mother liquor for diluting the disperse dye coupling completion material, then heating for crystal transformation, filtering and washing to obtain a dye filter cake and a salt-containing acidic mother liquor; and neutralizing the salt-containing acidic mother liquor with a magnesium compound, and filtering to obtain a clarified and neutralized mother liquor. And carrying out multiple-effect evaporation concentration and crystallization on the neutralized mother liquor exceeding the recycling amount to extract magnesium sulfate, and using evaporation condensate water for washing a disperse dye filter cake. The neutralization mother liquor is used for replacing clear water to dilute the disperse dye coupling completion material, the viscosity and acidity problems in disperse dye synthesis are solved, the product quality and yield are not affected, the mother liquor is reduced, the water consumption is reduced, meanwhile, the salt concentration of the neutralization mother liquor is increased, and the wastewater evaporation crystallization energy consumption is reduced.

The application provides a method for recycling electrolytic manganese industry waste salt, comprising the following steps: mixing the electrolytic manganese industry waste salt with calcium oxide, then performing first heat treatment and second heat treatment to obtain a treatment product; performing water immersion and solid-liquid separation on the treatment product to obtain first leaching residue and first leaching solution; performing evaporation crystallization on the first leaching solution to obtain a magnesium sulfate product; mixing the first leaching residue with ammonium sulfate and performing ball milling to obtain a mixture; performing calcination on the mixture to obtain a calcination product; performing water immersion on the calcination product to obtain second leaching residue and second leaching solution; performing evaporation crystallization on the second leaching solution to obtain a manganese sulfate product; performing water washing, solid-liquid separation and drying on the second leaching residue to obtain industrial gypsum. The method has the advantages of simple process, mild process conditions, low energy consumption, low cost, elimination of environmental pressure of electrolytic manganese industry waste salt stockpiling, and efficient recovery of Mg, Mn, NH4 + / NH3 and S resources in the electrolytic manganese industry waste salt and recovery of Ca, and the purity of the recovered manganese sulfate reaches the battery grade.

The present invention relates to amorphous silica comprising particles of amorphous silica with a D50 of from 5 µm to 30 µm. The present invention also relates to a method of producing amorphous silica and metal salts, the method comprising mixing olivine, water and acid in a first vessel and reacting the olivine with the acid to produce amorphous silica.

A method for separating nickel and / or cobalt salts from crude nickel and / or cobalt bearing stock is disclosed which comprises treating the crude nickel and / or cobalt bearing stock with an iron or aluminum salt under conditions to remove at least a portion of one or more alkali metal ions and / or monovalent cation species as a jarosite / alunite precipitate to provide a solution having a reduced content of one or more alkali metal ions and / or monovalent cation species, and gradually increasing the pH of the resulting solution under conditions to provide a feed solution for further purification to produce nickel and / or cobalt salts suitable for producing battery grade nickel or cobalt salts. A method for obtaining purified nickel and cobalt from the feed solution is also disclosed.

The invention provides a magnesium sulfate solution impurity removal device, and belongs to the technical field of magnesium sulfate production, the magnesium sulfate solution impurity removal device comprises an impurity removal box body, a driving assembly, a plurality of groups of filter cartridges, a flushing assembly, a pushing assembly, a collecting assembly and a lifting assembly, and the plurality of groups of filter cartridges are annularly distributed in the impurity removal box body; the plurality of filter cartridges are sequentially attached, a plurality of uniformly distributed filter holes are formed in the cartridge body of each group of filter cartridges, the flushing assembly is arranged above the plurality of filter cartridges, and the collecting assembly is arranged below the plurality of filter cartridges and corresponds to the flushing assembly. The lifting assembly is arranged at the bottom of the inner side of the impurity removal box. Compared with the prior art, according to the embodiment of the invention, when the magnesium sulfate solution is subjected to filtration and impurity removal, the impurities on the filter cartridge can be automatically cleaned and collected online, so that the filtration and impurity removal efficiency of the magnesium sulfate solution is improved.

The present invention discloses a method for producing magnesium sulfate monohydrate and potassium magnesium sulfate fertilizer by producing bittern from seawater. The present invention is directed to the bittern component of seawater and combines Na + , K + Mg 2+ 、Cl ‑ 、SO4 2‑ The invention realizes the comprehensive utilization of seawater salt brine and the simultaneous preparation of magnesium sulfate monohydrate and potassium magnesium sulfate fertilizer. In addition, K in seawater salt brine is used to produce magnesium sulfate monohydrate and potassium magnesium sulfate fertilizer. + Mg 2+ and SO4 2‑ The recovery rates were all above 80%.

The invention provides a method for separating magnesium and lithium in brine, which comprises the following steps: pretreating the brine to prepare pretreated brine; carrying out primary nanofiltration, secondary nanofiltration and reverse osmosis concentration on the pretreated brine; a nanofiltration membrane selected by the first-stage nanofiltration is a carboxylated MOF (Metal Organic Framework) modified nanofiltration membrane; the carboxylation modified nanofiltration membrane is prepared from the following raw materials: a support body, piperazine, carboxylation ZiF-8 and carboxylation Uio-66. According to the method, brine is pretreated, so that the risk of pollution of the brine to a nanofiltration membrane is reduced, the pretreated brine is pumped into a nanofiltration system, and trapped fluid enriched with magnesium and sulfate ions and high-lithium permeate liquid are generated; the trapped fluid is subjected to secondary nanofiltration to recover lithium, the secondary trapped fluid can be subjected to resource utilization, the permeate liquid enters a reverse osmosis membrane to concentrate the lithium content, and the concentrated lithium liquid enters a lithium precipitation process; magnesium and lithium are separated in the nanofiltration process, and meanwhile, the impurity removal process of lithium recovery is realized.

This invention discloses a method for preparing a bimetallic composite catalytic material and its application. The invention first obtains a bimetallic composite catalytic material by combining two transition metal elements, and then uses it to catalyze the oxidation of sulfite, achieving an oxidation rate of over 90%. Compared with non-catalytic oxidation, the oxidation efficiency of sulfite using the bimetallic composite catalytic material in this invention is increased by 20-35 times.