11 results about "Iron sulphate" patented technology

The present application belongs to the field of sodium batteries, and provides a composite sodium iron sulfate positive electrode material, and a preparation method therefor and the use thereof. The composite sodium iron sulfate positive electrode material comprises a core, the chemical formula of which is NaxMyFez(PO4)k(SO4)(0.4-0.6)xOt, wherein M comprises at least one of manganese, vanadium and titanium, 16≤x≤17, y=1, 4≤z≤5, 2≤k≤2.6, and y+z-0.1x-1.5k≤t≤y+z+0.1x-1.5k. In the present application, the decomposition of sulfate radicals is reduced, the material performance of the composite sodium iron sulfate positive electrode material is improved, and the performance aspects, such as the cycle performance, of a secondary battery in which the composite sodium iron sulfate positive electrode material is used are improved.

The application discloses a kind of iron wurtzite and sulphide iron ore mineral asynchronous flotation separation method, belong to nonferrous metal sulphide mineral flotation technical field;The application promotes the flotation of iron wurtzite by slurry aeration, realizes the asynchronous flotation of iron wurtzite, pyrite and pyrrhotite by means of high selectivity collector CTB-2 and oxidant calcium hypochlorite, solves the problem of difficult separation of iron wurtzite and pyrrhotite, and uses high concentration copper sulfate as depressor to rapidly improve the grade of zinc concentrate, uses ferrous sulfate to realize the sulfur-free flotation of sulfur concentrate, and finally obtains high-quality zinc concentrate, first sulfur concentrate (pyrite) and second sulfur concentrate (pyrrhotite) products.The application optimizes and simplifies the beneficiation process, cancels the magnetic separation step in the traditional process, and realizes efficient separation of zinc and sulfur through single flotation method.

This invention discloses a method for preparing battery-grade iron phosphate using iron-phosphorus titanium removal slag. The method includes: first, mixing the iron-phosphorus titanium removal slag with a titanium complex depolymerization aid, and then pretreating it to obtain an aid pretreatment slurry; next, drying the slurry and reacting it at 300-500℃ to obtain a first-stage high-temperature reaction product; then mixing it with an oxidant and reacting it at 800-900℃ to obtain a second-stage high-temperature reaction product; finally, obtaining the final product after acid leaching, aging, and drying. The battery-grade anhydrous iron phosphate prepared using this method has a specific surface area greater than 10 m². 2 The titanium residue is ≤50 ppm and the sulfur residue is ≤0.05%, and the relevant impurity indicators are better than industry requirements, which helps to reduce the charge transfer resistance of ferric phosphate. In addition, the method of this invention can be adapted to various ferric phosphate systems such as ferrous sulfate, ferrous chloride, and lithium-ion ferric phosphate slag acid solution, and has a wide range of application value.

The invention relates to the technical field of lithium ion battery materials, and discloses a low-cost method for preparing a battery-grade iron phosphate material, which comprises the following steps: mixing a phosphorus-containing ammonium sulfate solution recovered from iron phosphate production wastewater as a core phosphorus source with a ferrous sulfate solution; by accurately controlling the adding proportion of hydrogen peroxide and ammonia water and the pH value and ammonia nitrogen content of a reaction system, carrying out a synthetic reaction to generate an iron phosphate precursor; and carrying out phosphoric acid conversion, washing, flash drying and calcining on the precursor to obtain a final product. The iron phosphate material prepared by the invention has an iron-phosphorus ratio close to 1: 1 and an orthogonal and monoclinic phase coexisting double-phase structure, the sintering compaction density is high (greater than or equal to 2.47 g / cm < 2 >), the 1C specific discharge capacity is not less than 139mAh / g, and the battery grade application requirement is completely met.

This invention relates to the field of biomedical technology, and in particular to a method for preparing and applying a nanomedicine for treating deep endometriosis. The method involves mixing ferrous ammonium sulfate, trisodium citrate, and polyethyleneimine, then adding thioacetamide and triethanolamine via a solvothermal reaction to obtain two-dimensional iron sulfide nanosheets. Dopamine hydrochloride is then added and stirred at room temperature in anhydrous ethanol to obtain polydopamine-coated iron sulfide (FP). FP is then mixed with larotrectinib and anhydrous ethanol to obtain the nanomedicine FPL for treating deep endometriosis. The synthesis method of this invention is simple and highly operable; the product is stable and reproducible; FPL exhibits good biocompatibility and biodegradability. After entering the microenvironment of deep endometriosis lesions, it can responsively release larotrectinib, effectively inhibiting the Trk signaling pathway and significantly reducing the degree of nerve infiltration; simultaneously, the anti-inflammatory effect of the FP carrier alleviates the local inflammatory response, jointly inhibiting lesion progression.

The invention discloses a dry and wet membrane tank cleaning agent as well as a preparation method and application thereof. The dry and wet membrane tank cleaning agent comprises the following components: sulfuric acid, ferrous sulfate, phenolsulfonic acid, citric acid, sodium dodecyl benzene sulfonate, hydrogen peroxide and water. According to the invention, an advanced oxidation method is adopted to replace acid washing or alkali washing in the traditional technology for the first time, and the produced tank cleaning agent has extremely strong oxidation capacity, can effectively oxidize organic matters, and is suitable for dry film and green paint development processes in the PCB processing process; precipitated solids can be effectively removed, oily substances and intractable high polymer residues in dry films and green paint tanks can be removed, and the cleaning effect is very ideal. And regular tank cleaning can effectively ensure production quality and prolong the service life of instruments and equipment.

The invention provides a method for preparing iron phosphate and nickel sulfate from a ferrous sulfate solution containing nickel and chromium, and belongs to the technical field of valuable metal recovery. The method comprises the following steps: S1, carrying out purification treatment on a ferrous sulfate solution containing nickel and chromium so as to deeply remove chromium; s2, introducing a phosphorus source and a composite structure directing agent into the purified solution to form a mixed system; s3, step-by-step oxidation is conducted on the mixed system, then aging treatment is conducted, and an iron phosphate suspension and a nickel sulfate solution are obtained; s4, carrying out solid-liquid separation on the iron phosphate suspension, and washing, drying and calcining the obtained solid to obtain an anhydrous iron phosphate product; and S5, purifying the nickel sulfate solution to obtain a nickel sulfate product. The iron phosphate product prepared by using the proper composite structure guiding agent and the processes of step-by-step oxidation, aging and the like has good performances in the aspects of particle size, tap density, Fe / P molar ratio and the like, and the requirements of practical application are met.

A method for producing lithium iron phosphate from waste lithium iron phosphate material is provided. [Solution] The method includes the steps of: crushing the positive electrode sheet of a waste lithium iron phosphate battery, sieving it to obtain lithium iron phosphate raw material, dissolving it in an acidic solution, and collecting the first filtrate after filtration; adding ferrous sulfate solution to the first filtrate to obtain a mixed solution; adding hydrogen peroxide solution and ammonia aqueous solution to the mixed solution, filtering and washing after the reaction to obtain a second filtrate and a filtration cake; washing and drying the filtration cake to obtain iron hydroxyphosphate; adding barium hydroxide aqueous solution to the second filtrate, allowing it to react completely and then filtering to obtain a third filtrate; adding phosphoric acid solution to the third filtrate to obtain a fourth filtrate; mixing iron hydroxyphosphate, the fourth filtrate and a carbon source, sanding the slurry, drying and obtaining a powder; and sintering and pulverizing the powder in an inert atmosphere to obtain a carbon-coated lithium iron phosphate material.

The invention belongs to the technical field of sludge treatment, and particularly relates to a liquid bioleaching nutritional agent for industrial excess sludge and a treatment method, the nutritional agent is a filler / carrier-free aqueous solution type liquid preparation, and the nutritional agent is added according to 15-20wt% of the absolute dry amount of the industrial excess sludge to be treated. The nutritional agent comprises the following raw material components in percentage by absolute dry weight of sludge: 5.0-8.5 wt% of ferrous sulfate heptahydrate; 3.0 to 6.0 wt% of powdered sulfur; 2.0 to 2.5 wt% of ammonium chloride; 1.0 to 1.5 wt% of monopotassium phosphate; 0.8 to 1.2 wt% of ammonium sulfate; 0.5 to 0.8 wt% of magnesium sulfate heptahydrate; 0.3 to 0.5 wt% of zinc sulfate heptahydrate; 0.2 to 0.4 wt% of manganese sulfate monohydrate; 0.1 to 0.3 wt% of calcium nitrate tetrahydrate; and 0.1 to 0.2 wt% of composite vitamin. The liquid bioleaching nutritional agent for industrial excess sludge and the treatment method have the advantages of no filler, no sludge increase, uniform addition, reasonable energy substance and nutrition ratio, high acid production efficiency, short leaching period, strong flora poison resistance and adaptability, and good dehydration effect.

This invention discloses a method for preparing battery-grade iron phosphate from pyrite cinder. The method employs a strong alkaline solution-assisted ball milling process to activate and mechanically revitalize the pyrite cinder. After aging, impurities are converted into soluble components or passivated into acid-insoluble components that are then separated from iron oxide. Impurities are further removed by water leaching. Then, ferric sulfate obtained by direct acid leaching of the impurity-removed pyrite cinder with sulfuric acid is used as the iron source, phosphoric acid as the phosphorus source, and ammonia as a neutralizing agent to directly precipitate and prepare battery-grade iron phosphate. This invention achieves highly efficient removal of harmful impurities in the preparation of battery-grade iron phosphate from pyrite cinder, reducing the complexity of conventional methods that require adjusting the pH of the acid leaching solution to remove impurities or reducing the acid leaching solution to ferrous sulfate. This enables efficient and high-value resource utilization of pyrite cinder. The process is simple, the reaction conditions are mild, the operation and control are convenient, and it is easy to implement for large-scale industrial production.

This invention discloses a method for preparing battery-grade nickel-cobalt-manganese sulfate solution from low-grade nickel matte. Low-grade nickel matte is ground and then leached with concentrated sulfuric acid under normal pressure to obtain a first slag phase and a first liquid phase. The first liquid phase is evaporated, concentrated, and then cooled to crystallize, yielding ferrous sulfate crystals. Concentrated sulfuric acid is added to the first slag phase, and oxygen pressure leaching is performed to obtain a second slag phase and a second liquid phase. The pH of the second liquid phase is adjusted to 3-4 to generate a precipitate. The precipitate is filtered off to obtain a filtrate. The filtrate is then adsorbed using a chelating resin. The adsorbed chelating resin is first washed with a first sulfuric acid solution to obtain a washing solution containing Mg and Mn, and then washed with a second sulfuric acid solution to obtain a nickel-cobalt sulfate solution. The nickel-cobalt sulfate solution is mixed with the washing solution containing Mg and Mn to obtain a nickel-cobalt-manganese sulfate solution. This invention uses low-grade nickel matte as a raw material to prepare battery-grade nickel-cobalt sulfate solution, improving the recovery rate of nickel and cobalt and reducing acid consumption.