21 results about "Iron sulphate" patented technology

The invention provides an iron-based sulfate composite material as well as a preparation method and application thereof, and the method comprises the following steps: modifying aluminum-doped sodium ferrous sulfate Na < 2 + 2x > Fe < 2-x-1.5 y > Al < y > (SO4) 3 with few-walled carbon nanotubes subjected to surface acid treatment, and carrying out thermal shock reaction to obtain the iron-based sulfate composite material. The iron-based sulfate composite material provided by the invention can be used as a sodium ion battery positive electrode material with excellent rate capability and cycle performance.

The invention provides a barium slag harmless treatment method which comprises the following steps: mixing barium slag and desulfurized waste gypsum, adding water, beating into slurry, adding diluted industrial acid, stirring, acidifying, and heating, so that most of barium in the slurry forms BaSO4; adding a coupling agent, stirring, and carrying out coupling and competitive coordination reaction with free barium ions and barium salt in the product; adding a sulfate solution, and carrying out double decomposition reaction with the chelate barium to generate a non-toxic BaSO4 precipitate; and adding a ferrous sulfate solution to combine the rest of ferrous ions and sulfur ions in the product to form an iron sulfide precipitate, carrying out filter pressing to obtain filter residues with the water content of 20-30%, and drying. According to the method, toxic metal barium in the barium slag can be converted into nontoxic barium sulfate, and sulfur ions are converted into stable ferric sulfate, so that the barium ions, sulfide and corrosive pH value in the treated product all reach the national general solid waste first-class slag standard. The invention also provides an application of the barium slag treated by the method in building and building material industries.

The present invention discloses a method for producing lithium iron phosphate by recycling water resources, which belongs to the field of new energy material technology, including: using filtered wash water to dissolve ferrous sulfate and monoammonium phosphate, which undergo synthesis and aging reactions to obtain an iron phosphate reaction liquid, which undergoes solid-liquid separation, washing, etc. to obtain dihydrated iron phosphate; the dihydrated iron phosphate reacts with a lithium source and a carbon source, and is then dried and calcined to obtain lithium iron phosphate. During the entire process, the production wastewater is recycled after simple treatment, achieving zero discharge of wastewater and effective recovery of lithium ions, greatly reducing production costs. According to statistics, the present invention actually saves 0.15-0.58 kg of lithium and 24.3-29.3 m3 of pure water per ton of lithium iron phosphate. 3 , reduce the amount of washing water and iron-lithium wastewater treatment to 28.6~29.8m 3 and 1.6~2.2m 3 .

The present invention relates to the technical field of wastewater treatment, and in particular, to a method and application for recovering phosphorus in phosphorus-containing wastewater containing iron phosphate. The method for recovering phosphorus in phosphorus-containing wastewater containing iron phosphate comprises the following steps: (a) mixing salt-containing wastewater and filtrate to obtain a mixed water sample A; (b) adding an oxidant to the mixed water sample A to obtain a mixed solution B; (c) adding ferrous sulfate to the mixed solution B to obtain a reaction slurry C; (d) performing a first solid-liquid separation on the reaction slurry C to obtain a filter cake D; (e) adjusting the pH of the slurry containing the filter cake D to 1.4 to 1.8, and then performing a stirring reaction, a second solid-liquid separation, drying and calcining to obtain iron phosphate. The method for recovering phosphorus in phosphorus-containing wastewater containing iron phosphate has a high phosphorus recovery rate, and the obtained iron phosphate is of good quality and high purity, and can be used as a precursor of lithium battery positive electrode materials.

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 iron phosphate preparation, and discloses a method and device for continuously synthesizing iron phosphate, and the method comprises the following steps: 1) respectively adding iron powder and dilute sulphuric acid into a first continuous tubular reactor; 2) respectively pumping the ferrous sulfate solution and the phosphate solution into a second continuous tubular reactor; 3) continuously feeding the slurry into a crystal transformation aging kettle; 4) continuously conveying the aged slurry into a horizontal screw centrifuge for solid-liquid separation; 5) continuously conveying solids obtained by solid-liquid separation in the step 4) to a re-pulping tank, adding pure water, re-pulping and washing; 6) continuously conveying a filter cake to flash evaporation drying and high-temperature calcination, and then crushing, packaging and demagnetizing to obtain an iron phosphate product; according to the invention, the quality stability is ensured, the product production cycle is shortened, and the product quality stability is improved; the problem that a large amount of hydrogen escapes from a traditional kettle type reaction kettle to cause safety risks is solved.

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 present invention provides a high-entropy sodium iron sulfate positive electrode material, a preparation method thereof, and a sodium-ion battery. The high-entropy sodium iron sulfate positive electrode material includes a doped sodium iron sulfate material and a carbon coating layer. The molecular formula of the doped sodium iron sulfate material is Na 2.5 Fe 1.75‑ x A y B z C m D n (SO4)3, where 0 < x ≤ 0.5, 0 ≤ y ≤ 0.06, 0 ≤ z ≤ 0.06, 0 ≤ m ≤ 0.06, 0 ≤ n ≤ 0.06, 2x = 2y + 3z + 4m + 5n, and at least two of y, z, m, and n are not 0; A is selected from at least one of Mn 2+ , Mg 2+ , Zn 2+ , Ni 2+ , Cu 2+ , Sn 2+ , Ca 2+ , Co 2+ ; B is selected from Al 3+ and / or Cr 3+ ; C is selected from Zr 4+ and / or Ti 4+ ; D is selected from Nb 5+ and / or Ta 5+ , and at least contains four doping elements, and the contained doping elements satisfy equimolar or near-equimolar doping. The present invention conducts high-entropy doping on sodium iron sulfate to improve the low-temperature performance and cycling performance of the battery.

The present invention relates to the technical field of sodium-battery materials, and discloses a positive electrode material of composite sodium ferric sulfate and a preparation method therefor, a positive electrode and a sodium-ion battery. For the positive electrode material of composite sodium ferric sulfate, particles of the positive electrode material include a sodium ferric sulfate matrix, a three-dimensional conductive network embedded into the sodium ferric sulfate matrix and a conductive coating layer coated outside the sodium ferric sulfate matrix; and the three-dimensional conductive network and the conductive coating layer are both formed from PEDOT. The preparation method includes: mixing PSS, EDOT, sodium sulfate, ferrous sulfate and an oxidant as an initiator in an aqueous solution and making the same fully react to render a precursor solution; drying the precursor solution; and then carrying out heat treatment to render the positive electrode material of composite sodium ferric sulfate. The positive electrode is prepared by the above positive electrode material. The sodium-ion battery includes the above positive electrode. The positive electrode material has good conductivity, capacity, rate and interface stability.

The invention provides a composite carbon-coated sodium ferrous sulfate positive electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion batteries, the composite carbon-coated sodium ferrous sulfate positive electrode material comprises sodium ferrous sulfate and a composite carbon coating layer coating at least part of the surface of the sodium ferrous sulfate; materials for forming the composite carbon coating layer comprise a biomass porous carbon material and an inorganic carbon source. The biomass porous carbon material and the inorganic carbon source are used at the same time to form the composite carbon coating layer, and the composite carbon coating layer is used for coating the sodium ferrous sulfate, so that the compaction density and the cycle performance of the sodium ferrous sulfate positive electrode material are effectively improved, and the resistivity of the sodium ferrous sulfate positive electrode material is reduced.

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 belongs to the technical field of biological medicines, and discloses an iron sulfide coated polydopamine nano material for toxicity reduction and efficacy enhancement of cervical cancer radiotherapy, and a preparation method and application of the iron sulfide coated polydopamine nano material. The method comprises the following steps: dissolving ammonium ferrous sulfate and trisodium citrate in ethylene glycol to obtain a solution A, dissolving polyethyleneimine in ethylene glycol to obtain a solution B, adding the solution B into the solution A, and stirring and reacting at normal temperature to obtain a mixed solution; adding a thioacetamide solution into the mixed solution, then dropwise adding triethanolamine, carrying out stirring reaction at normal temperature, carrying out solvothermal reaction after stirring is ended, and centrifuging and washing a product after the reaction is ended, so as to obtain a two-dimensional iron sulfide nanosheet; and adding dopamine hydrochloride, and stirring in absolute ethyl alcohol at room temperature to obtain the iron sulfide coated polydopamine nano material. The synthesis method is simple, convenient and high in operability; the synthesized product is stable and has repeatability; the traditional Chinese medicine composition can be used for sensitizing radiation therapy of cervical cancer, can relieve radiation colitis and reduce side effects of radiation therapy, and is beneficial to clinical application.

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.

The invention relates to the field of hydrometallurgy, in particular to a short-process purification preparation method of high-purity iron phosphate, which comprises the following steps: (1) performing solid-phase extraction on ferrous sulfate feed liquid containing impurity metal elements by using a solid-phase extraction agent A, and selectively adsorbing and removing the impurity metal elements in the solution to obtain a purified ferrous sulfate solution; (2) mixing the purified ferrous sulfate solution obtained in the step (1) with a phosphate solution, and carrying out oxidation precipitation reaction to generate an iron phosphate precursor; and (3) the iron phosphate precursor obtained in the step (2) is filtered, washed, dried and roasted, an iron phosphate product is obtained, and the solid-phase extraction agent A comprises resin of a formula (I) and / or resin of a formula (II). The final product is low in impurity content and high in tap density, the industrial problem that multiple impurities are difficult to synchronously and deeply remove under the acidic and high-iron background is solved, and the requirements of the high-end lithium ion battery positive electrode material precursor are completely met. (I) and (II).

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.