169results about "Magnesium sulfates" patented technology

A forest fire retardant composition contains a retardant compound that includes a phosphate salt. The phosphate salt may include diammonium phosphate, diammonium orthophosphate, monoammonium phosphate, monoammonium orthophosphate, monosodium phosphate, disodium phosphate, disodium phosphate hydrate, sodium ammonium phosphate, sodium ammonium phosphate hydrate, sodium tripolyphosphate, trisodium phosphate, or dipotassium phosphate, and combinations thereof. The forest fire retardant composition may include an ammonium source. The composition may be in the form of a dry concentrate, a liquid concentrate, or a final diluted product. The final diluted product is effective in suppressing, retarding, and controlling forest fires while exhibiting corrosion resistance and low toxicity.

A forest fire retardant composition contains a retardant compound that includes a phosphate salt. The phosphate salt may include diammonium phosphate, diammonium orthophosphate, monoammonium phosphate, monoammonium orthophosphate, monosodium phosphate, disodium phosphate, disodium phosphate hydrate, sodium ammonium phosphate, sodium ammonium phosphate hydrate, sodium tripolyphosphate, trisodium phosphate, or dipotassium phosphate, and combinations thereof. The forest fire retardant composition may include an ammonium source. The composition may be in the form of a dry concentrate, a liquid concentrate, or a final diluted product. The final diluted product is effective in suppressing, retarding, and controlling forest fires while exhibiting corrosion resistance and low toxicity.

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 provides a manganese electrolysis anolyte purification and purification residue utilization method which comprises the following steps: adding sodium fluoride into a manganese electrolysis anolyte for precipitation and purification to obtain a purification solution and purification residues; adding a sodium hydroxide solution into the purified slag, and carrying out wet grinding alkali transfer to obtain alkali transfer slag and alkali transfer liquid; adding sulfuric acid into the alkali transfer slag for acid leaching to obtain magnesium sulfate and calcium sulfate slag; adding hydrofluoric acid into the alkali transfer solution for neutralization to obtain a neutralized solution; the neutralization liquid is subjected to evaporative crystallization, sodium fluoride is obtained, and the sodium fluoride is used for precipitation purification. According to the method, the manganese electrolysis anolyte is precipitated and purified through sodium fluoride to separate calcium and magnesium elements and manganese ions, then the calcium element and the magnesium element are separated through sodium hydroxide solution wet ball milling and sulfuric acid leaching, and the starting material sodium fluoride is recycled, so that waste liquid generated in the technological process is reduced, and the production cost is reduced. The cyclic utilization of resources is promoted, and the concept of green sustainable development is met.

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 invention relates to the technical field of separation equipment, in particular to a crystal separation device for magnesium sulfate production and a use method thereof, the crystal separation device comprises two parallel mounting frames fixedly connected to the ground, a crystallization barrel is arranged on the two mounting frames, the crystallization barrel comprises a barrel body, the barrel body is rotatably connected to the two mounting frames, and the barrel body is provided with a plurality of through holes; a rotating mechanism is connected between the barrel body and the mounting frame, the rotating mechanism is used for driving the barrel body to rotate, a bearing plate is further fixedly connected in the barrel body, and a crystal scraping mechanism and a crystal discharging mechanism are arranged on the bearing plate. According to the magnesium sulfate crystallization device, the crystallization barrel is arranged and can be driven by the driving mechanism to turn over up and down, so that a magnesium sulfate solution can be switched between the liquid containing hoppers and the cooling barrel at the two ends, magnesium sulfate crystals and the solution can be separated through the filter plate, and multiple times of crystallization of the magnesium sulfate solution can also be achieved through turning over of the crystallization barrel; and the use is relatively simple.

The invention discloses a comprehensive utilization method and application of phosphate tailings, and the method comprises the following steps: S1, carrying out primary acidolysis on the phosphate tailings to obtain slag and a primary acidolysis solution; s2, the slag is subjected to flotation, and flotation concentrate, flotation tailings and flotation filtrate are obtained; the flotation filtrate is recycled to the flotation procedure; s3, the flotation concentrate is subjected to secondary acidolysis, and gypsum and secondary acidolysis liquid are obtained; s4, the gypsum is subjected to reverse flotation, and reverse flotation filtrate and white gypsum are obtained; the reverse flotation filtrate is recycled to a reverse flotation procedure; combining the primary acidolysis solution and the secondary acidolysis solution, and carrying out evaporation concentration to obtain a crystal filtrate and magnesium sulfate; recycling the crystallization filtrate to a primary acidolysis and / or secondary acidolysis process; the method integrates multiple acidolysis, flotation and reverse flotation operations to realize efficient recovery of calcium, magnesium and phosphorus, and the obtained recovered product is high in recovery rate and high in purity.

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 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 invention relates to a method and a device, by means of which particles with a high magnesium content can be obtained from sea water. The particles can be magnesium hydroxide for example as well as other water-insoluble magnesium salts, such as magnesium sulfate, magnesium carbonate, etc., for example. The particles are produced in a precipitation process using a suitable alkali reagent. When the precipitation is carried out using a nozzle construction according to the invention and / or while adding auxiliary reagents, the size of the obtained particles and the yield thereof can be influenced within a specified range. The aqueous suspension obtained from the process can be further processed in order to produce different products, up to metallic magnesium for metallurgy, using existing technical methods.

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 present invention relates to a method for preparing magnesium sulphate by treating a brine typically originating from seawater desalination.

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.

A process for preparing a magnesium sulphate comprising a step of reacting a calcined magnesite comprising magnesium oxide (MgO) with diluted sulphuric acid (H2SO4) to obtain magnesium sulphate (MgSO4) and water (H2O).

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 discloses centrifugal sedimentation equipment for magnesium sulfate production, which comprises a working box, a centrifugal mechanism is arranged in the working box, a cleaning mechanism is further fixedly arranged in the working box, and the cleaning mechanism is arranged on one side of the centrifugal mechanism. After centrifugal sedimentation of magnesium sulfate is finished, supernate in a centrifugal cylinder after centrifugation is pumped away by turning on a water suction pump, then a switch on a circulating pipe is turned on, residues settled at the bottom in the centrifugal cylinder fall into a residue collecting box, after separation is finished, a hydraulic rod is started, the hydraulic rod drives an abutting rod to fall, and a cleaning rod slides down relative to the centrifugal cylinder; the motor I is started until the cleaning rod is in contact with the bottom of the centrifugal barrel, and controls the centrifugal barrel to rotate relative to the cleaning rod, so that the cleaning rod cleans residues adhered to the inner wall of the centrifugal barrel, the influence of the cleaning mechanism on the magnesium sulfate solution is eliminated, and the centrifugal result is better.

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 invention provides a method for recycling electrolytic manganese industrial waste salt, which comprises the following steps: mixing the electrolytic manganese industrial waste salt with calcium oxide, and carrying out first heat treatment and second heat treatment to obtain a treated product; the treated product is subjected to water leaching and solid-liquid separation, and first leaching residues and first leaching liquid are obtained; evaporating and crystallizing the first leachate to obtain a magnesium sulfate product; the first leaching residues and ammonium sulfate are mixed and subjected to ball milling, and a mixture is obtained; roasting the mixture to obtain a roasted product; after the roasted product is subjected to water leaching, second leaching residues and second leaching liquid are obtained; evaporating and crystallizing the second leaching solution to obtain a manganese sulfate product; the second leaching residues are subjected to water washing, solid-liquid separation and drying, and industrial gypsum is obtained. The method is simple in technological process, mild in technological condition, low in energy consumption and low in needed cost, the environmental protection pressure of storage of the electrolytic manganese metal industrial waste salt can be eliminated, efficient recycling of Mg, Mn, NH4 < + > / NH3 and S resources in the electrolytic manganese metal industrial waste salt and recycling of Ca can be achieved, and the purity of recycled manganese sulfate reaches the battery grade.

The present invention discloses a brine refining device and method for by-product gypsum and magnesium compounds, and relates to the technical field of brine refining. The present invention recycles the concentrated brine and washing water generated in the production for use in the production system again, without secondary waste discharge. The prepared gypsum has a whiteness of more than 90% and a purity of more than 96%; the magnesium compound has a whiteness of more than 92% and a purity of more than 95%. Under the premise of ensuring the quality of the primary brine, the brine refining process is subjected to a step-by-step refining process, and the crude magnesium hydroxide and calcium sulfate dihydrate are preliminarily separated, and the crude material is purified by methods such as dissolution, precipitation, washing, and drying. The salt mud that occupies a large amount of land for storage is comprehensively utilized to produce high-value-added magnesium series compounds and semi-hydrate gypsum, turning waste into treasure, and greatly alleviating the problem of salt mud storage in soda ash production.

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.