6843results about "Phosphorus compounds" patented technology

The invention discloses a preparation method of a high-compaction-density lithium iron phosphate material, through grading of large and small particle lithium iron phosphate, optimization of a sintering process and reasonable selection of a carbon source and a titanium dopant, the compaction density and the electrochemical performance of the material are remarkably improved, and the preparation method specifically comprises the following steps: mixing iron phosphate, lithium carbonate, the carbon source and auxiliary materials; the preparation method comprises the following steps: carrying out coarse grinding and fine grinding, respectively preparing large-particle lithium iron phosphate and small-particle lithium iron phosphate (a material A and a material B) by adopting spray drying and high-temperature calcination processes, mixing the material A and the material B according to a ratio, adding auxiliary materials, grinding, further carrying out spray drying, calcining and crushing to obtain a final lithium iron phosphate product, and the maximum compaction density of the prepared material can reach 2.712 g / cm < 3 >. According to the present invention, the maximum 1C discharge specific capacity can achieve 140.5 mAh / g, the maximum 1C 3.2 V discharge platform retention rate is 91.4%, and the prepared lithium ion battery negative electrode material has characteristics of excellent conductivity, high discharge capacity and good cycle stability, and is suitable for power batteries and energy storage batteries.

The present invention relates to a sodium-ion battery material, and specifically relates to a sodium ferric phosphate pyrophosphate composite material, and a preparation process, evaluation method and process optimization method therefor and the use thereof. The sodium ferric phosphate pyrophosphate composite material has a spinel-type NaFePO4 phase; and in an XRD diffraction pattern obtained by subjecting the sodium ferric phosphate pyrophosphate composite material to XRD diffraction using CuKα radiation, there are a characteristic diffraction peak T of sodium ferric phosphate pyrophosphate and a characteristic diffraction peak O of spinel-type NaFePO4 at 2θ of 33.6±0.2° and 32.8±0.2°, respectively, the peak intensities thereof are respectively IT and IO, and the diffraction peak intensity ratio Ir is equal to IT / IO, wherein 6.19≤Ir≤13.

The invention provides a preparation method of a carbon-coated lithium iron manganese phosphate positive electrode material, and belongs to the technical field of battery positive electrode materials, and the preparation method comprises the following steps: co-precipitating a mixed solution of an iron source, a manganese source and a phosphorus source and a precipitant solution, and drying to obtain a manganese iron phosphate precursor; adding a lithium source, calcining in stages in an inert gas atmosphere, and grinding to obtain lithium manganese iron phosphate powder; the preparation method comprises the following steps: carrying out ball milling on lithium manganese iron phosphate powder and a fluxing agent, dispersing in a carbon source solution, uniformly wrapping a carbon source, drying, carrying out segmented calcination, and carrying out ball milling. The precursor nucleation coating uniformity is improved through segmented speed control reaction of a phosphorus source solution, a manganese source solution and an iron source solution; lithium source mixing and segmented calcination are adopted, and lithium volatilization is reduced; the modified nitrogen-doped porous carbon source is used for coating the lithium iron manganese phosphate powder to generate the lithium iron manganese phosphate positive electrode material, so that the conductivity of the lithium iron manganese phosphate positive electrode material is enhanced.

The invention provides a lithium ion secondary battery, a battery device, a power utilization device, a preparation method of a positive electrode active material and a preparation method of a positive electrode plate. The lithium ion secondary battery comprises a positive pole piece, a negative pole piece and an electrolyte, the positive pole piece comprises a positive current collector and a positive film layer arranged on at least one side of the positive current collector, and the positive film layer comprises a positive active material; the positive electrode active material comprises lithium-containing transition metal phosphate particles, at least part of the surfaces of the lithium-containing transition metal phosphate particles are provided with carbon coating materials, and in the tangent plane of the positive electrode film layer in the thickness direction of the pole piece, DA90 of the particles is 1400 nm to 2100 nm; the particle size concentration ratio (DA90-DA10) / DA50 is 1.855-2.375, and DA90, DA50 and DA10 refer to the particle sizes of the corresponding particles when the cumulative area distribution of the particles reaches 90%, 50% and 10% in an area cumulative distribution curve of the particles.

The invention discloses a lithium manganese iron phosphate positive electrode material with a core-shell structure, which is prepared by the following steps: mixing a manganese source, an iron source, a phosphorus source, lithium carbonate and a carbon source, grinding and drying to prepare a pre-sintered material; then carrying out gas crushing on the pre-sintered material to obtain a pre-gas crushed material, and carrying out heat preservation at the temperature of 200-600 DEG C; putting the pre-gas crushed material subjected to heat preservation into an iron salt solution for quenching reaction to obtain iron compound coated lithium manganese iron phosphate; and finally, mixing the lithium iron manganese phosphate coated with the iron compound, a lithium source, a phosphorus source and a carbon source, grinding, drying, and carrying out secondary calcination to obtain the lithium iron manganese phosphate material with the core-shell structure. During preparation of the lithium manganese iron phosphate positive electrode material, a lithium manganese iron phosphate pre-sintered body and an iron salt solution are subjected to a quenching reaction to form an iron compound coated lithium manganese iron phosphate pre-sintered body, and then the iron compound coated lithium manganese iron phosphate pre-sintered body and other raw materials of lithium iron phosphate are subjected to a secondary calcination reaction to generate the composite positive electrode material with a core-shell structure. A coating structure is formed, the reaction between manganese and electrolyte is reduced, the dissolution of manganese is inhibited, the Gingtaler effect of manganese is relieved, and the stability of the material is improved; and the material has the advantages of high energy density, high power density, excellent cycle performance and strong core-shell interface bonding force.

The present disclosure relates to the technical field of sodium-ion batteries, and in particular to an iron-based polyphosphate-type sodium-ion battery positive electrode material, a preparation method therefor and a use thereof. An organic ferrous source, a sodium source, a phosphorus source and a dopant are mixed and then ground until D50 is less than 180 nm, so that the reactivity of the material is improved, a solid-phase reaction is facilitated, and doped high-valence metal elements such as vanadium, niobium, titanium, zirconium and tin can be better doped into lattices of the iron-based polyphosphate-type sodium-ion battery positive electrode material (NFPP), so as to replace the iron site to form lattice defects such as vacancies, thereby improving the ionic conductivity of the material, inhibiting generation of NaFePO4 impurity phase, and improving the capacity and cycling stability of the material.

The invention discloses a solid-phase sintering repair method of a waste lithium iron phosphate battery material, and relates to the related field of battery recovery and repair, and the method comprises the following steps: disassembling the waste lithium iron phosphate battery material, taking out a battery positive plate, cleaning, drying and separating a positive material; a spectrograph is adopted for component analysis, the element component content is determined, and raw material adding and supplementing are conducted based on the deviation value of the theoretical element proportion; based on the characteristic information, sectional type sintering scheme analysis is conducted, and solid-phase sintering repair scheme parameters are obtained; the mixed lithium iron phosphate powder is pressed into a sheet shape and placed in sintering equipment for solid-phase sintering repairing treatment, and a repairing sample is obtained; and obtaining test performance parameters according to a battery application detection standard, and performing repair compensation control on the repair scheme parameters. The technical problem that the repairing effect is uncontrollable due to lack of precise analysis and targeted optimization in existing solid-phase sintering repairing is solved, and the technical effects of efficient repairing and performance improvement are achieved.

The invention belongs to the technical field of iron phosphate preparation, and discloses an energy-saving control system for iron phosphate preparation based on an energy consumption scheduling model. The system is composed of a data acquisition module, an energy consumption sensing module, a preparation process modeling module, an energy consumption prediction module, an energy-saving scheduling module, an intelligent execution module, a feedback correction module, a man-machine interaction module and a remote operation and maintenance module. The energy consumption sensing module intelligently senses an energy consumption state, the preparation process modeling and energy consumption prediction module accurately predicts energy consumption, the energy-saving scheduling module generates an optimal scheduling strategy, the intelligent execution module accurately executes an instruction, and the feedback correction module realizes closed-loop adaptive regulation and control; all the modules cooperatively operate, process parameters are adjusted in real time according to actual working conditions of iron phosphate preparation, energy consumption in the preparation process is remarkably reduced, the energy utilization rate is increased, and energy-saving optimization of iron phosphate preparation is achieved.

The invention discloses a process and system for recovering phosphorus and fluorine from ardealite leachate, which comprises the following steps: feeding the ardealite leachate into an induced crystallization reactor for induced crystallization, discharging generated large-particle fluorapatite crystals from a crystal discharge port at the bottom of the induced crystallization reactor, and collecting and recycling; aluminum hydroxide flocs and fine-particle fluorapatite crystals enter a cyclone separator along with the effluent, the fine-particle fluorapatite crystals are separated and then flow back to the induced crystallization reactor, the aluminum hydroxide flocs form precipitates in the flocculation sedimentation tank through flocculation to be removed, and the effluent of the flocculation sedimentation tank enters a multi-stage treatment system. According to the method disclosed by the invention, fluorine and phosphorus in the phosphogypsum leachate are recovered together, the recovered fluorapatite finished product is high in purity and can be recycled, and the amount of chemical sludge is also greatly reduced, so that the treatment cost of the sludge is reduced.

The invention relates to the technical field of lithium ion batteries, in particular to a gradient-doped lithium iron phosphate positive electrode material and a preparation method and application thereof. The invention provides a gradient doped lithium iron phosphate positive electrode material, on a particle cross section of the lithium iron phosphate positive electrode material, a particle center is taken as a circle center, a distance from the particle center to a nearest surface is taken as a radius R, a concentric circle region with a radius of 0.5 R is taken as a central region, and the rest part is a surface layer region, the metal doping amount of the central region is D1, the metal doping amount of the surface layer area is D2, D1 is larger than D2, delta D is equal to D1-D2, and delta D is larger than or equal to 2000 ppm and smaller than or equal to 4000 ppm. In the obtained lithium iron phosphate positive electrode material, sufficient compaction density can be ensured, the problem of poor dynamic performance of the positive electrode material can be well solved, and the discharge performance and rate capability of the lithium iron phosphate positive electrode material are effectively improved.

The invention discloses a chitosan modified lithium iron phosphate and carbon composite positive electrode material and a preparation method thereof.The preparation method comprises the steps that 1, lithium hydroxide, phosphoric acid and ferrous sulfate heptahydrate are mixed to prepare a uniform and stable solution, and a lithium iron phosphate precursor is prepared through a solvothermal method; step 2, dissolving chitosan in an acetic acid aqueous solution, and magnetically stirring under a water bath condition until the chitosan is completely dissolved to prepare a chitosan solution; and 3, adding the lithium iron phosphate precursor into a chitosan solution, uniformly mixing, carrying out ball milling and freeze drying, and carrying out high-temperature carbonization treatment in an inert gas to obtain the chitosan modified lithium iron phosphate and carbon composite positive electrode material. The method is simple to operate, low in cost and uniform in product particle size distribution.

The invention discloses a preparation method and application of an amorphous nickel-cobalt-iron phosphate anode catalyst, and belongs to the technical field of alkaline water electrolysis hydrogen production, the preparation method comprises the following steps: (1) dissolving transition metal salt in a solvent, and stirring to obtain a metal salt solution; (2) dissolving phosphate in a solvent, and stirring to obtain a phosphate solution; and (3) adding the phosphate solution into the metal salt solution for reaction, washing with deionized water and ethanol, centrifugally separating, and drying to obtain the amorphous nickel-cobalt-iron phosphate anode catalyst. According to the preparation method and application of the amorphous nickel-cobalt-iron phosphate anode catalyst, process safety improvement and environmental friendliness optimization are achieved through an all-water-phase green synthesis system, the obtained catalyst shows excellent performance in an AEM electrolytic cell, the cell voltage is only 1.87 V under the current density of 2 A / cm, and the method has remarkable industrial application prospects.

The invention discloses a gradient composite coated modified lithium manganese iron phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of positive electrode materials. An LMFP precursor is pretreated through a citric acid-ethanol mixed solution, an active crystal face is exposed, and then a three-dimensional gradient coating structure of a polydopamine (PDA) chemical bonding layer, an MXene nanosheet middle layer and a polyaniline (PANI) conductive outer layer is sequentially constructed on the surface of the material, so that the electronic conductivity of the lithium manganese iron phosphate positive electrode material is increased to 10 <-3 > S / cm magnitude, and the performance of the lithium manganese iron phosphate positive electrode material is improved. The capacity retention ratio (1C) of 500 cycles is larger than 90%, the coating layer is not prone to falling off, and meanwhile dissolution of manganese ions is effectively inhibited.

The invention discloses a yellow phosphorus furnace electrode paste and a preparation method thereof, and belongs to the technical field of yellow phosphorus furnace production, the yellow phosphorus furnace electrode paste comprises the following raw materials by mass: 55-65% of anthracite particles, 20-25% of petroleum coke, 5-10% of graphite chips, 18-25% of a composite binder, 0.3-1.5% of a composite antioxidant and 1.5-4.5% of an additive; the yellow phosphorus furnace electrode paste provided by the invention is produced according to the preparation method provided by the invention, and the resistivity, compressive strength and oxidation resistance can be synchronously improved through the design of carbon material multistage particle size distribution, a nano-reinforced composite binder and a synergistic anti-oxidation system in combination with an efficient drying and densification process; the problem that an existing electrode paste is poor in density and performance is effectively solved.

The invention discloses a method for regenerating waste lithium iron phosphate into a lithium manganese iron phosphate positive electrode material under assistance of element doping. According to the method, the waste lithium iron phosphate is successfully regenerated into the lithium manganese iron phosphate material with excellent performance through solid-phase sintering and element doping. Compared with a traditional repairing and regenerating method, the method has the advantages that upgrading and regenerating of the waste lithium iron phosphate are realized, and the market competitiveness of regenerated products is improved. Compared with other methods, the method does not need an acid leaching step, and the recovery process is simpler and more environment-friendly. And an element doping modification means is introduced, so that the performance of the regenerated lithium manganese iron phosphate material is further improved. The invention aims to provide a green, efficient and high-valued method for upgrading and regenerating the waste lithium iron phosphate positive electrode material into the lithium iron manganese phosphate positive electrode material with industrial application prospects.

Large-particle, low-specific-surface-area and high-dynamics lithium iron phosphate particles. The primary average particle size of the lithium iron phosphate particles is 500-3000 nm, and the BET specific surface area thereof is 3 m2 / g to 8 m2 / g. By means of calculation on the basis of the total weight of the lithium iron phosphate particles, the carbon content of the lithium iron phosphate particles is Cx weight%, where 0.8≤Cx≤2.0.

A waste lithium iron phosphate battery recovery method. The method comprises selective leaching, deep purification and battery-grade iron phosphate preparation. By means of selective leaching, lithium and ferrophosphorus materials are separated in one step, and leaching conditions are optimized to prevent difficulty in leaching ferrophosphorus and inability to dissolve impurities caused by transformation of a ferrophosphorus crystal form; obtained ferrophosphorus graphite slag is used as a raw material for synthesizing iron phosphate, and is subjected to further purification and impurity removal (deep purification) by means of a dilute strong acid and an alkali solution, thereby reducing subsequent complex processes such as liquid phase impurity removal of ferrophosphorus liquid, and finally, the purified ferrophosphorus graphite slag is subjected to acid leaching to obtain high-purity filtrate containing phosphorus and iron which can be used for directly synthesizing battery-grade iron phosphate. In the whole process, a small amount of acid is used, a high-impurity-content battery material can be treated, the impurity element removal efficiency is high, the process is short, and the economic benefit is high.

The invention relates to a method for recycling sludge, in particular to a method for enhancing efficient release and recycling of carbon and phosphorus in sludge in a gradient mode. According to the method for stepwise strengthening efficient release and recycling of carbon and phosphorus in sludge, the release efficiency of phosphorus in different occurrence forms in the sludge is improved in a targeted mode, efficient release of inorganic phosphorus and organic phosphorus is achieved through the synergistic effect of multiple steps, meanwhile, efficient release and recycling of carbon are synergistically improved, and the method has the beneficial effects of improving the utilization rate of carbon and phosphorus in sludge and improving the utilization rate of carbon and phosphorus in sludge. The method is used for improving the overall resource recycling efficiency of carbon and phosphorus in the excess sludge and comprises the following steps: 1, pretreating the sludge; 2, pre-treating the green chelating agent to intensify the release of inorganic phosphorus; 3, recovering inorganic phosphorus; 4, resuspending the sludge; 5, strengthening sludge solubilization and hydrolysis by using a peroxidant; 6, anaerobic recycling; 7, recycling carbon and phosphorus resources; the recovery process is simple and convenient, the loss rate is low, the phosphorus recovery rate can reach 80%-99.5%, the acid production efficiency is improved by 14 times or more, and the method has remarkable advantages.

The invention discloses a method for recovering lithium phosphate from lithium iron phosphate black powder. The method comprises the following steps: mixing black powder recovered from waste lithium iron phosphate batteries with sodium persulfate, and calcining; adding water into the obtained calcined product, dissolving, filtering to obtain water extract A and leaching residues, washing the leaching residues with water, and calcining at high temperature to obtain battery-grade iron phosphate; adding a sodium hydroxide solution into the water extract A, and reacting to obtain a water extract B; adding a trisodium phosphate solution into the water immersion liquid B, fully reacting, performing suction filtration to obtain lithium phosphate and filtrate, and cleaning and drying the lithium phosphate to obtain battery-grade lithium phosphate; and freezing and denitrifying the filtrate to obtain a denitrified solution, and adding the denitrified solution into the sodium hydroxide solution for recycling. The method does not generate wastes, recycles the filtrate in the whole process, theoretically realizes zero loss of the lithium element, prevents the iron element from entering the solution, simplifies the preparation steps of the lithium phosphate, and has the advantages of cost reduction and environmental protection.

The invention provides a lithium ion secondary battery, a battery device, a power utilization device, a preparation method of a positive electrode active material and a preparation method of a positive electrode plate. The lithium ion secondary battery comprises a positive pole piece, a negative pole piece and an electrolyte, the positive pole piece comprises a positive current collector and a positive film layer arranged on at least one side of the positive current collector, the positive film layer comprises a positive active material, and the positive active material comprises lithium-containing transition metal phosphate particles of which at least partial surfaces are provided with carbon coating materials; in the tangent plane of the positive electrode film layer along the thickness direction of the pole piece, the area proportion of particles with the particle size greater than or equal to 1 mu m is 30.0-50.0%; and the mass ratio of the magnetic substance in the positive electrode film layer is greater than or equal to 20 ppm and less than or equal to 1980 ppm.

The invention provides a method for preparing a high-performance lithium manganese iron phosphate positive electrode material based on a manganese iron phosphate precursor, and relates to the technical field of batteries. A method for preparing a high-performance lithium manganese iron phosphate positive electrode material based on a manganese iron phosphate precursor comprises the following steps: S1, mixing a phosphorus source, an iron source and a manganese source in a water medium, adding a surfactant, and carrying out ball milling, drying and sintering to obtain the manganese iron phosphate precursor; and S2, mixing the manganese iron phosphate precursor, a lithium source, a carbon source, a doping agent, an auxiliary agent and deionized water, and carrying out ball milling, drying and sintering to obtain the lithium manganese iron phosphate positive electrode material. The method can improve the surface / interface stability while improving the surface conductivity of the material, thereby prolonging the cycle life of the battery and improving the charge-discharge capacity of the battery.

The invention provides a coated modified high-nickel ternary positive electrode material, a preparation method and a lithium ion battery, the coated modified high-nickel ternary positive electrode material comprises a high-nickel ternary matrix and a coating layer containing an oxide solid electrolyte, the coating layer is coated outside the high-nickel ternary matrix and accounts for 1%-3% of the mass of the high-nickel ternary matrix; the oxide solid electrolyte comprises Li < 3x > La < 2 / 3-x > TiO < 3 > (0 lt; x < = 0.16), Li < 7 > La < 3 > Zr < 2 > O < 12 >, Li < 1 + y > Al < y > Ti < 2-y > (PO < 4 >) < 3 > (0 lt; y < = 0.5); the ionic conductivity of the oxide solid electrolyte is greater than or equal to 1 * 10 <-4 > S / cm. The selected oxide solid electrolyte has high ionic conductivity and electronic insulativity, a rapid lithium ion transmission channel can be provided, interface side reaction can be inhibited, the rate capability and the cycling stability of the material can be remarkably improved, and when the oxide solid electrolyte forms a coating layer, the coating layer is not prone to deformation, and the service life of the material is prolonged. The interface bonding strength with a high-nickel ternary matrix can be improved through chemical bonding, the interface impedance can be remarkably reduced, and the dynamic performance of the material is improved.

The invention discloses a recovery technology for waste lithium iron phosphate batteries, and aims to prepare high-purity iron phosphate and lithium phosphate and comprehensively recover valuable metals such as iron, aluminum and copper in the high-purity iron phosphate and lithium phosphate. The method mainly comprises the following steps that waste lithium iron phosphate battery powder is subjected to oxidizing roasting to obtain roasted battery powder, the roasted battery powder is mixed with phosphoric acid and hydrogen peroxide in different molar ratios, the liquid-solid ratio is adjusted through deionized water, oxidizing leaching is conducted, and lithium-rich liquid and primary leaching residues are obtained; the secondary leaching residues are subjected to phosphoric acid activation, and high-purity iron phosphate dihydrate is obtained after the pH is adjusted; and performing metal ion precipitation on the lithium-rich liquid by adjusting the pH value, and finally performing high-temperature calcination to obtain high-purity lithium phosphate. The method not only realizes efficient leaching and separation of lithium, but also improves the precipitation efficiency of iron phosphate, solves the problems of low metal resource recovery rate and serious process pollution in the prior art, and is suitable for large-scale treatment of waste lithium iron phosphate batteries.

This invention discloses a method for leaching lithium iron phosphate mixed powder with iron salts and recovering all components, belonging to the field of battery recycling. The invention uses an iron salt solution to leach the mixed powder, obtaining a lithium-containing leachate and leaching residue. Ferrous ions in the leachate are regenerated into ferric iron through acidification and oxidation, and recycled for leaching the next batch of mixed powder. After reaching a preset number of cycles, the leachate is used for re-leaching multiple batches of leaching residue to improve the lithium leaching rate. Ultimately, a enriched solution containing Li, Fe, Cu, and Al and graphite-containing iron phosphate residue are obtained. Copper is recovered from the enriched solution through iron powder replacement, and a high-purity lithium chloride solution is obtained through extraction and separation, while ferric chloride (recycled) and aluminum chloride crystals are also recovered. The leaching residue is treated with hydrochloric acid to obtain regenerated graphite, and the pH is adjusted with alkali to obtain high-purity iron phosphate. This method achieves full component recovery under mild conditions, reducing separation steps and chemical consumption through a "leaching-regeneration-leaching" cycle mechanism, thus achieving both environmental and economic benefits.

The invention relates to the technical field of preparation of positive electrode materials, in particular to a preparation method and application of a lithium iron phosphate material. The preparation method at least comprises a process of sintering a precursor material under a reduction condition to obtain the lithium iron phosphate material, wherein the precursor material at least comprises an iron source, a lithium source, a phosphorus source and a metal dopant, the mass ratio of the metal dopant is larger than or equal to 0, and the molar ratio of the iron element to the total phosphorus and the molar ratio of the doped metal to the total phosphorus are 0.96-0.97. According to the preparation method, generation of the iron phosphide (Fe3P, Fe2P, FeP and the like) impure phase is controlled from the burdening end by regulating and controlling the proportion of specific elements in the raw materials, so that preparation of the lithium iron phosphate material with high compaction and low iron phosphide impure phase is realized, and subsequent complicated impurity removal operation is avoided.

The invention provides a method for recycling lithium iron phosphate, which comprises the following steps: S1, obtaining lithium iron phosphate black powder, and washing the lithium iron phosphate black powder by using alkali liquor to obtain aluminum-removed black powder and aluminum-containing lithium filtrate; s2, the aluminum-removed black powder is subjected to acid leaching treatment with acid liquor, and acid leaching liquor is obtained; s3, carrying out reduction precipitation treatment on the acid leaching solution by using a composite reducing agent to obtain a copper-removed leaching solution and solid-phase copper-containing slag; s4, adding a phosphorus source and an oxidizing agent into the copper-removed leaching solution, adding alkali to adjust the pH value, and carrying out oxidation precipitation treatment to obtain iron phosphate precipitate and a first lithium-containing solution; and S5, adjusting the pH value of the aluminum-lithium-containing filtrate in the step S1 by using an acid solution to obtain aluminum filter residues and a second lithium-containing solution. According to the method, iron phosphate with relatively high purity can be obtained; meanwhile, the obtained first lithium-containing solution and the second lithium-containing solution are relatively low in impurity ion content and can be used for obtaining a lithium salt product with relatively high purity.

The invention relates to the technical field of preparation of iron phosphate materials, in particular to a method for doping iron phosphate with titanium, which comprises the following steps: 1, dissolving a titanium dioxide by-product ferrous sulfate powder in water to prepare a titanium-containing iron source solution; 2, adding water into the reaction kettle, and stirring; 3, adding the titanium-containing iron source solution, the phosphorus source solution, ammonia water and an oxidizing agent into a reaction kettle to prepare primary slurry; 4, carrying out filter pressing on the primary slurry, washing until the conductivity is less than or equal to 2000us / cm, and then adding water to prepare secondary slurry; 5, phosphoric acid is added into the reaction kettle for bottoming, and the temperature is increased to 60-70 DEG C; 6, adding the secondary slurry into the reaction kettle, and carrying out heat preservation reaction on the secondary slurry and phosphoric acid; and 7, filtering the reaction product obtained in the step 6, washing until the conductivity is less than or equal to 500us / cm, and then drying and sintering. According to the method, the titanium doping technological process is simplified, and meanwhile the titanium element utilization rate in the titanium dioxide by-product and the purity of the titanium-doped iron phosphate product are improved.

The invention discloses an intelligent gradient extraction process and method for nutritional ingredients in yak bone marrow, and belongs to the technical field of bioactive substance extraction. The extraction method comprises the following four steps: gradient pressure supercritical degreasing, double-enzyme synergistic gradient enzymolysis, acid concentration gradient demineralization and temperature gradient gelatin extraction, and through the process coupling design of gradient pressure degreasing, buffer enzymolysis, graded acidolysis and membrane separation of gelatin, the high yield of the product in the previous stage is ensured; active structures of follow-up components are reserved to the greatest extent. Meanwhile, a sensing-decision-execution closed-loop system is constructed, real-time data sources such as NIR moisture sensing, online OPA detection and XRD in-situ analysis are integrated, technological parameters are dynamically adjusted through a multi-objective optimization algorithm, and global optimization of the yield, the purity and the energy consumption is achieved.

The invention provides a method for recovering a lithium iron phosphate material from a waste battery, and relates to the technical field of battery material recovery. The method comprises the following steps: pre-treating the waste battery; treating a positive plate; and material recovery. Wherein the positive plate treatment specifically comprises the step of soaking the positive plate by adopting a first soaking agent. And crushing the positive plate soaked in the first soaking agent. Soaking the crushed positive plate in a second soaking agent, and filtering to obtain a first filter residue taking the positive active material as a main component; and drying, grinding and screening the first filter residue to remove impurities so as to obtain the lithium iron phosphate impurity-removed material. According to the method for recovering the lithium iron phosphate material from the waste battery, provided by the invention, impurities in the recovered lithium iron phosphate material can be reduced, and the purity of the recovered lithium iron phosphate material is increased; the performance of the lithium iron phosphate material synthesized again after the lithium iron phosphate in the waste battery is recycled can meet the brand-new battery-grade raw material requirement.

A method for preparing modified iron(III) phosphate, comprising the following steps: (1) preparing NH2-MIL-53(Al) nanoparticles, mixing the nanoparticles with a solvent, adding an acid solution, and heating and stirring the mixture to obtain hollow NH2-MIL-53(Al) powder; (2) using the hollow NH2-MIL-53(Al) powder to prepare a dispersion, mixing the dispersion with an iron salt solution, stirring and then drying the mixture, mixing the resulting powder with a phosphorus source solution, controlling the pH, and carrying out a reaction; and (3) carrying out sintering treatment on a material resulting from aging to obtain the modified iron(III) phosphate. Provided are iron(III) phosphate prepared according to the method and a positive electrode material. In the method, a hollow metal organic framework nanomaterial is used as a template to provide a micro reaction area for the synthesis of iron(III) phosphate, so that the microscopic morphology of the prepared iron(III) phosphate is restrained and controlled to prepare nanoscale iron(III) phosphate having a polyhedral structure.