238 results about "Ferric hydroxide" patented technology

The invention discloses a method for recovering lithium, nickel cobalt manganese composite hydroxide and aluminum copper powder from a waste ternary lithium ion battery pole piece. The method comprises the following steps: treating waste pole pieces of a ternary plant or a mixture of positive and negative pole pieces by using a Fenton technology, leaching by using a mixed ferric salt solution, and filtering to obtain lithium-containing leachate and slag; adjusting the pH value of the leachate, oxidizing and filtering to obtain a purified solution and ferric hydroxide precipitate, and adding the purified solution and a lithium hydroxide solution into a reactor for coprecipitation to obtain a deeply purified solution and the nickel-cobalt-manganese composite hydroxide. And dissolving the ferric hydroxide precipitate with dilute acid, adding a reducing agent to generate a ferrous salt solution, and returning the ferrous salt solution for Fenton reaction and leaching reaction. And adding the sodium carbonate saturated solution into the deep purification solution, and crystallizing and precipitating to obtain the battery-grade lithium carbonate. And performing hydrodynamic screening on the leaching residues to obtain an aluminum-copper mixture and graphite residues, and performing grinding and specific gravity separation on the aluminum-copper mixture to obtain high-purity aluminum powder and copper powder. According to the method, the iron salt is directly leached from the pole piece, the used iron salt can be recycled, and the method is suitable for large-scale recovery of the waste ternary lithium ion battery.

The invention discloses a chlorobenzene wastewater continuous stripping purification recovery device and an implementation method, the chlorobenzene wastewater continuous stripping purification recovery device comprises an aeration tank, an alkali water washing system, an acid water washing system, an acid-base neutralization system and a ferric hydroxide separation system, the aeration tank is connected with the alkali water washing system, the acid water washing system is connected with the alkali water washing system, and the acid water washing system is connected with the ferric hydroxide separation system. The acid-base neutralization system is connected with the alkali-water washing system, the acid-water washing system and the ferric hydroxide separation system, and the alkali-water washing system and the acid-water washing system are both in two-stage steam stripping, and have the following advantages: alkali washing water and acid washing water generated in the chlorobenzene production process are subjected to two-stage nitrogen steam stripping, so that the content of organic matters is greatly reduced; ferric hydroxide is generated through neutralization of acid-alkali wastewater, the total amount of the wastewater is reduced, then the ferric hydroxide reacts with hydrochloric acid in the pickling water to generate ferric trichloride, hydrochloric acid is neutralized, the neutralization product ferric hydroxide is consumed, the wastewater amount is reduced, and recycling of wastewater resources is achieved.

The invention discloses a solar photovoltaic cable sheath material and a tear-resistant photovoltaic cable, and belongs to the field of photovoltaic cable manufacturing. The sheath material comprises the following components in parts by weight: 70-120 parts of ethylene propylene rubber, 10-13 parts of crosslinked polyethylene, 3-7 parts of zinc oxide, 1-4 parts of stearic acid, 1-2 parts of paraffin, 2-5 parts of an anti-aging agent RD, 8-12 parts of zinc borate, 150-200 parts of a reinforcing agent, 10-12 parts of high abrasion furnace black, 9-13 parts of tricresyl phosphate, 9-13 parts of red phosphorus, 0.5-1 part of an accelerant TMTD, 3-5 parts of DCP and 1-2 parts of HVA-2. The reinforcing agent composed of sodium silicate, ferric chloride and aluminum hydroxide is added into the sheath material, so that when the sheath material is damaged, sodium silicate and ferric chloride react under the influence of air moisture to generate colloidal silicic acid carrying ferric hydroxide and aluminum hydroxide, and the damaged part is filled with the colloidal silicic acid; and meanwhile, the aluminum hydroxide can promote the colloidal silicic acid to be dried, so that the damaged part is repaired, and the situation that the tear resistance of the cable is remarkably worsened due to damage is avoided.

The invention belongs to the technical field of environmental rock soil, and particularly relates to a preparation method of zeolite-magnetic iron oxide and application of the zeolite-magnetic iron oxide in catalyzing sodium percarbonate to repair petroleum hydrocarbon polluted soil. The specific method comprises the following steps: carrying out alkali treatment on zeolite, and then carrying out heat treatment to obtain alkali-heat combined modified zeolite; extracting an iron element in the iron-containing by-product with acid and preparing ferric hydroxide colloid; and uniformly mixing the alkali-heat combined modified zeolite with the ferric hydroxide colloid, carrying out solid-liquid separation, and then carrying out heat treatment and hydrogen reduction treatment to obtain the zeolite-magnetic iron oxide, the application specifically comprises the following steps: uniformly mixing sodium percarbonate, tween-80, silica sol and water to prepare a turbid solution A; uniformly mixing zeolite-magnetic iron oxide, organic acid, silica sol and water to prepare a turbid solution B; and uniformly mixing the turbid liquid B with the petroleum hydrocarbon polluted soil, then adding the turbid liquid A, uniformly mixing, and maintaining for 12-15 days to finish the remediation.

The invention provides amorphous iron phosphate, the X-ray diffraction pattern of the amorphous iron phosphate has a first diffraction peak theta 1 and a second diffraction peak theta 2 at 19-21 degrees and 28-30 degrees respectively, and the ratio of the peak intensity I1 of the first diffraction peak to the peak intensity I2 of the second diffraction peak is 0.8-0.91; the amorphous iron phosphate is spherical or sphere-like particles. The amorphous iron phosphate has the advantages of low ferric hydroxide content, uniform particle size distribution, small primary particle size and low agglomeration degree, and is beneficial to subsequent preparation of iron phosphate with high specific surface area, small primary particle size and low agglomeration. The invention also provides a preparation method of the amorphous iron phosphate and anhydrous iron phosphate prepared based on the amorphous iron phosphate.

The invention belongs to the technical field of flow battery energy storage, and more specifically relates to a near-neutral total iron flow battery negative electrode electrolyte and a preparation method thereof, the negative electrode electrolyte is prepared from an iron salt, a chelating agent, a stabilizing agent, a supporting electrolyte and water at a certain temperature, the total iron concentration is 0.1-1.0 M, the molar ratio of the chelating agent to the iron salt is 1.2-2.0, the molar ratio of the stabilizing agent to the supporting electrolyte is 1.2-2.0, and the total iron concentration is 0.1-1.0 M. The molar ratio of the stabilizer to Fe is 0.25-1.0, the supporting electrolyte concentration is 0-2.0 mol / L, and the pH value is 7.0-8.5. The near-neutral negative electrode electrolyte for the total-iron flow battery is high in stability, can effectively inhibit generation of ferric hydroxide precipitates under a neutral condition, improves the stability of iron ions, greatly prolongs the cycle life of the total-iron flow battery, and can be widely applied to various aqueous flow batteries.

The invention provides a low-cyanide gold leaching agent system and a dump leaching process thereof, and belongs to the technical field of hydrometallurgy. According to the method, a synergistic process of'interface activation, cyanide etching and iron precipitation inhibition 'is constructed by designing a low-cyanide gold leaching agent system. The amino acid auxiliary leaching agent adsorbs the gold surface to weaken lattice energy, so that the etching efficiency of trace cyanide ions is improved; mercapto-containing malic acid is used as a chelating agent, specific mercapto in molecules of the mercapto-containing malic acid and iron ions form an ultrahigh-stability water-soluble complex, generation of ferric hydroxide precipitates is thoroughly blocked, ferrous ions stabilized by the chelating agent are subjected to in-situ oxidation through dissolved oxygen and efficiently regenerated into potassium ferricyanide, and accumulation of free cyanogens in a solution system is eliminated; meanwhile, a chelating agent-iron complex forms a self-buffering pair, the pH of the dump leaching solution is accurately controlled, and secondary precipitation caused by local alkalization is prevented. According to the process, under the synergistic effect that the core chelating agent guarantees permeation stability and the leaching aid accelerates gold dissolution, the heap leaching period is compressed to 45 days.

The invention discloses a recycling method of NF3 residual electrolysis liquid, and relates to the technical field of residual electrolysis liquid recycling treatment. The method comprises the following steps: step 1, removing Fe ions in the electrolytic residual liquid: firstly, adding hydrogen peroxide or oxygen into the electrolytic residual liquid for reaction, oxidizing ferrous ions into ferric ions, then adding ammonia water and sodium hydroxide or ammonium bicarbonate and sodium hydroxide into the solution for reaction, precipitating ferric ions in the form of ferric hydroxide; 2, hydrofluoric acid is added into the electrolyte solution obtained after iron removal to adjust the pH of filtrate to 3-12, the filtrate enters an extraction system, the nickel element in ammonium hydrogen fluoride is extracted out, and ammonium hydrogen fluoride is purified; and step 3, the nickel element separated from the electrolyte enters a second section to be extracted and synthesized into a nickel sulfate product.

The invention discloses a coagulant for industrial wastewater treatment and a preparation method thereof, and belongs to the technical field of water treatment.The coagulant comprises a main flocculant and an auxiliary flocculant, the main flocculant is polyferric sulfate and / or polyaluminum chloride, and the auxiliary flocculant is organic modified diatomite; the organic modified diatomite is prepared by condensing aminated diatomite and a carboxylation modifier; the aminated diatomite is diatomite treated by an aminated silane coupling agent. The auxiliary flocculant not only has a porous characteristic, active functional groups on the surface can adsorb metal cations, and the auxiliary flocculant can be integrally used as a crystal nucleus to promote growth and aggregation of other precipitates (such as ferric hydroxide, aluminum hydroxide and the like) on the surface, so that the precipitation process is accelerated, the removal efficiency of pollutants in wastewater is improved, and the wastewater treatment effect is improved. The effect of enhancing coagulation is achieved.

The invention provides a collaborative treatment and resource utilization process for CO2 in industrial solid waste and tail gas, and belongs to the technical field of environmental protection. According to the method, carbon residues in the gasified slag are used as a catalyst, and aluminum and silicon are extracted through the gasified slag chemical method under the polybasic acid aqua regia effect and the electrochemical effect. According to the method disclosed by the invention, a stack retting neutralization mode is adopted, so that the superacid and aluminum and iron oxides in the ash residues are converted into soluble salts, and ferric hydroxide, aluminum hydroxide and polybasic acid ammonium are sequentially replaced from a salt solution by virtue of an ammonia replacement method, so that the use safety risk of high oxidability of polybasic acid is overcome; rapid crystallization of the aluminum salt solution in the form of aluminum chloride is promoted by using the same ion effect; performing stack retting neutralization reaction on the slag charge and sodium hydroxide to generate sodium silicate, introducing carbon dioxide to obtain silicic acid and sodium carbonate, and reacting the sodium carbonate solution with calcium hydroxide to obtain sodium hydroxide. The sodium hydroxide, the polyatomic acid, the ammonia gas and the activated carbon are recycled for treating the fly ash and the coal gangue, so that the comprehensive utilization of multi-element solid waste is realized.

The invention discloses a method for deeply removing arsenic from a nickel sulfate solution, which comprises the following steps: adjusting the pH value by using nickel hydroxide to form colloid to preliminarily remove arsenic, oxidizing by using sodium sulfate, and adding polyferric sulfate to form ferric hydroxide colloid to deeply adsorb and remove arsenic, and is simple in process, convenient to implement in the production process, capable of greatly reducing the cost and reducing the environmental pollution, and suitable for industrial production. The method comprises the following steps: adjusting the pH value of a low-pH leaching solution / anolyte / crude nickel sulfate dissolving solution to 4.0 or more by using nickel hydroxide, carrying out filter pressing to remove slag, adding arsenic ions in a sodium persulfate oxidation solution, reacting for 30 minutes, adding polyferric sulfate, reacting for 30 minutes, and carrying out filter pressing to obtain a nickel sulfate solution which is almost free of arsenic, and the method is efficient, safe and environment-friendly.

A method and equipment for recycling alumina red mud. First, the alumina red mud is added to a mixed acid of hydrochloric acid and sulfuric acid for reaction to dissolve metals such as iron, aluminum, calcium, sodium, and a small amount of zinc, copper, magnesium, etc., and the solid silicon dioxide is left to be separated as building materials or glass raw materials; after the solution is collected, ammonium bicarbonate is added to obtain aluminum, calcium, and some metal precipitates and separated. Iron and sodium remain in the solution and continue to react with sodium hydroxide to obtain iron hydroxide precipitate and separate out sodium salts. After evaporation of the concentrated solution, iron oxide is obtained as a raw material for steel production; the aluminum, calcium, and other metal precipitates are added to sulfuric acid with a concentration of 90-98% for reaction. After all are dissolved, the solution is subjected to membrane separation and then carbonates are added to obtain calcium carbonate precipitate as a raw material for cement production; after evaporation of the concentrated solution, high-purity alumina is obtained and sent to an aluminum processing plant to produce pure aluminum or aluminum alloy products; the separated sodium salt solution is evaporated to be used as industrial and agricultural salt; the acid mist and harmful gases in the reactor process are treated by an absorption tower and then discharged. The present invention can make full use of the iron oxide, alumina, and effective components of alumina red mud, solves the problem of environmental pollution caused by the large amount of piled-up alumina red mud at present, has a low cost, and is suitable for the current alumina production plants.

The invention relates to a low-cobalt-salt adhesion promoter and a preparation method thereof, and relates to the technical field of rubber adhesives, the low-cobalt-salt adhesion promoter is of a core-shell structure and comprises, by mass, 10-15 parts of core metal precursor powder, 15-20 parts of a shell SiO2 shell layer and 5-8 parts of long-chain alkylsilane grafted to the surface of the SiO2 shell layer; the metal precursor powder comprises cobalt hydroxide, manganese hydroxide and ferric hydroxide, and the molar ratio of the cobalt hydroxide to the manganese hydroxide to the ferric hydroxide is 1: (2-3): (1-1.5). According to the invention, the dispersibility of the low-cobalt salt adhesion promoter and the compatibility with rubber can be effectively improved.

The invention discloses a comprehensive utilization method of refining slag, which comprises the following steps: dissolving the refining slag in hydrochloric acid to obtain a refining slag pickle liquor; filtering the refining slag pickle liquor to obtain first filtrate and filter residues, and washing the filter residues to obtain first solid and first washing liquor; combining the first washing liquid and the first filtrate to obtain a second mixed solution; and adding an oxidizing agent into the second mixed solution to obtain a first precipitate. According to the method, the refining slag is subjected to acid leaching with hydrochloric acid, the PH value of the solution is adjusted, silicon dioxide, aluminum hydroxide, ferric hydroxide, calcium chloride or calcium oxide and recycled hydrochloric acid are obtained, the accumulated refining slag is decomposed into various new substances in the process reaction, the method is simple, the substance purity is high, the refining slag is recycled, and large economic value can be created; and meanwhile, mining of various resources is reduced. And a new direction is found for comprehensive utilization of the refining slag.

The invention relates to the technical field of battery materials, and discloses a lithium-sulfur battery catalyst, a preparation method thereof and a lithium-sulfur battery. According to the lithium-sulfur battery catalyst, particles of the catalyst comprise an MXTiO base material and alpha-Fe2O3 deposited on the surface of the MXTiO base material; the MXTiO base material comprises an MXene nanosheet and a titanium oxide layer covering the surface of the MXene nanosheet; the metal element in the MXene nanosheet is Ti. The preparation method comprises the following steps: carrying out hydrothermal reaction on MXene to generate titanium oxide on the surface of MXene to obtain an MXTiO material; preparing a mixed dispersion liquid, wherein iron ions are dissolved in the mixed dispersion liquid, and an MXTiO material is dispersed in the mixed dispersion liquid; alkali liquor is added into the mixed dispersion liquid, ferric hydroxide is precipitated on the surfaces of particles of the MXTiO material, then a reaction product is calcined, and the MXTiO / alpha-Fe2O3 heterostructure material is obtained. The catalyst shows excellent electro-catalytic performance in the lithium-sulfur battery.

The invention discloses a clean, efficient and low-cost lithium extraction slag utilization method which comprises the following steps: mixing lithium extraction slag with a fluxing agent, and sequentially carrying out roasting treatment, solid-liquid separation treatment, aging treatment and water leaching treatment to obtain a second solid-liquid mixture; carrying out solid-liquid separation treatment on the second solid-liquid mixture to obtain a second filter residue and a second filtrate; performing carbon separation method treatment on the first filtrate to obtain a third solid-liquid mixture; carrying out solid-liquid separation treatment on the third solid-liquid mixture to obtain a third filter residue and a third filtrate; the main component of the second filter residue and the third filter residue is white carbon black; performing heat treatment on the second filtrate and the third filtrate to obtain a fourth solid-liquid mixture; performing solid-liquid separation treatment on the fourth solid-liquid mixture to obtain fourth filter residues and fourth filtrate; the main components of the fourth filter residue are aluminum hydroxide and ferric hydroxide; and separating the fourth filtrate to obtain a sodium sulfate crystal substance and a potassium sulfate crystal substance.

The application provides a clean recycling method of waste lithium iron phosphate positive electrode material, which comprises the following steps: (1) the waste lithium iron phosphate positive electrode material is pretreated to separate aluminum foil, a binder and carbon, and a mixture containing phosphorus, iron and lithium is obtained; (2) the mixture is subjected to oxidative leaching in a sodium hydroxide solution, and the obtained mixed slurry is subjected to solid-liquid separation to obtain iron hydroxide precipitation and a leaching solution; (3) sodium carbonate and the leaching solution are mixed, lithium is precipitated, and solid-liquid separation is performed to obtain lithium carbonate and a separation solution; the separation solution is subjected to crystallization and solid-liquid separation to obtain sodium phosphate crystals; (4) the lithium carbonate in step (2), the iron hydroxide precipitation in step (3), phosphoric acid and carbon powder are mixed, and calcination is performed to obtain lithium iron phosphate. The clean recycling method can realize high-purity and high-efficiency recycling of the waste lithium iron phosphate positive electrode material, and the process flow is clean and environmentally friendly.

The invention provides continuous wastewater treatment equipment, which belongs to the technical field of wastewater treatment, and comprises a treatment tank and an observation window arranged in the middle of the treatment tank, and further comprises a multi-stage treatment assembly, a pollution discharge purification assembly and a stripping assembly, deep purification of the wastewater is realized through multi-stage treatment; the vertical spraying is combined with the stirring of the fan blades and the scrapers, strong water flow scouring force is formed above the elastic filter plate, meanwhile, the convex plates periodically extrude the elastic filter plate during rotation to enable the elastic filter plate to vibrate, suspended particles and impurities can be effectively prevented from being accumulated on the surface of the elastic filter plate, the risk of filter plate blockage is reduced, and meanwhile, the service life of the filter plate is prolonged. Ferric hydroxide colloid generated by ferrite reaction can more uniformly adsorb suspended particles under the driving of upper and lower water flows, and the precipitation separation of the suspended particles is accelerated; the connecting shaft rotates to drive the mounting cylinder, the arc-shaped groove of the trigger cavity is matched with the ball, the oxidation disc vibrates, the vibration strength is adjusted according to the descending amplitude of the oxidation disc, and the overall wastewater treatment efficiency is improved.

The invention discloses a treatment method of an electrolyte after wet crushing of a waste lithium ion battery. During crushing, an alkaline solution is sprayed out of a spraying opening located above a shearing opening to completely cover the waste lithium ion battery crushed material, a hydrolysis reaction is carried out under the cooperation of ultrasonic waves, and waste water, a pole piece mixture, a shell pile head, a diaphragm and the like are separated out through hydrodynamic force. The method comprises the following steps: adding dilute acid into wastewater to adjust the pH value, adding bivalent iron salt and hydrogen peroxide, performing Fenton oxidation and mineralization on an organic solvent in the wastewater under the synergism of ultrasonic waves, then adding an alkali metal salt solution to adjust the pH value, and filtering and separating to obtain filtrate and ferric hydroxide precipitate; adding alkali into the filtrate twice to adjust the pH value for precipitation, and filtering to separate valuable precipitate and filtrate; and adding dilute acid into the ferric hydroxide precipitate for dissolving, and then adding a reducing agent to obtain a ferrous salt solution which is circularly used for Fenton reaction. According to the method, hydrolysis, Fenton oxygenolysis, mineralization of the organic electrolyte and regeneration and recycling of the ferrous salt are adopted, and the method is suitable for large-scale and low-cost treatment of the electrolyte in the waste lithium ion battery.

The invention belongs to the technical field of high-iron bauxite resource utilization, and discloses a method for removing iron in high-iron bauxite, which comprises the following steps: mixing and stirring high-iron bauxite, an iron removal agent and water to obtain mixed ore pulp; wherein the iron removal agent is a mixture of oxalic acid and oxalate; stirring and leaching the mixed ore pulp so as to carry out iron removal reaction; after the iron removal reaction is finished, liquid-solid separation is carried out, and leaching residues and leaching liquid are obtained; adjusting the pH value of the leachate, and stirring to carry out a reaction of precipitating iron and aluminum; after the precipitation reaction is finished, carrying out liquid-solid separation to obtain filter residues and filtrate containing oxalate; carrying out an aluminum removal reaction on the filter residue by using an aluminum removal agent, and after the aluminum removal reaction is finished, carrying out liquid-solid separation to obtain a ferric hydroxide precipitate and a sodium aluminate solution; according to the method, aluminum and iron in the aluminum-iron embedded structure in the high-iron bauxite are removed through wet preimpregnation, the adverse effect of iron oxide on aluminum mineral dissolution is eliminated, and the dissolution rate of the aluminum mineral is increased.

The invention provides a process for comprehensively recovering valuable metals such as nickel, copper, gold, palladium and platinum and sulfur from hot filter residues, which comprises the following steps of: leaching copper, nickel and iron in the hot filter residues by adopting a high-pressure oxygen leaching process, and respectively recovering iron, copper and nickel in forms of ferric hydroxide, copper sulfide and nickel sulfide by adopting a manner of precipitating iron by adopting sodium hydroxide and precipitating copper and nickel by adopting sodium sulfide in a fractional manner; performing triple-effect crystallization on the generated wastewater to obtain pure sodium sulfate, drying leaching residues generated by high-pressure oxygen leaching, performing hot filtration to obtain crude sulfur and primary noble metal enriched residues, and performing low-pressure distillation on the primary noble metal enriched residues in a vacuum furnace to obtain crude sulfur and secondary noble metal enriched residues; and leaching gold, platinum and palladium in the secondary precious metal enrichment slag by adopting a hydrochloric acid chlorine method, returning the leaching slag to a vacuum distillation process, replacing and enriching precious metals in a leaching solution by adopting zinc powder, and carrying out triple-effect crystallization on generated wastewater after a conventional purification process to obtain a zinc chloride crystal product, so that comprehensive recovery of nickel, copper, gold, palladium, platinum and other valuable metals and sulfur is realized.

The invention discloses a system and a method for efficiently removing iron from make-up water of an offshore heavy oil thermal recovery boiler. The structure of the system is as follows: an electrochemical reactor, a compact cyclone air floater, a heat exchanger, an inorganic ultrafiltration membrane, a primary reverse osmosis membrane, an ion exchanger membrane and a thermal deaerator are connected in sequence; and the compact cyclone air floater is also connected with a bypass inlet for inputting seawater / geothermal water. The method comprises the following steps: seawater / geothermal water is introduced into an electrochemical reactor in the system and is treated by a compact cyclone air floater, a heat exchanger, an inorganic ultrafiltration membrane, a primary reverse osmosis membrane, an ion exchanger and a thermal deaerator in sequence, and produced water meets the water inlet requirement of an offshore thermal recovery boiler. The method comprises the following steps: oxidizing ferrous ions in water into iron ions through an electrochemical reactor, and then adjusting the pH value to convert the iron ions into ferric hydroxide; according to the present invention, the electrochemical oxidation is performed on the incoming water, the generated strong oxidizing free radicals can demulsify the dissolved oil in the water, and then the oil is removed in the cyclone air flotation so as to reduce the pollution of the oil to the rear end membrane;

The invention discloses a recovery method for extracting lithium, copper and aluminum from waste lithium iron phosphate batteries. First, waste lithium iron phosphate batteries are pretreated to obtain a mixture of positive and negative electrode sheets in a flaky state, and then the electrode sheet mixture is leached with a trivalent iron salt solution as a leaching agent, and a lithium-containing leachate and ferrophosphorus slag including copper and aluminum current collectors are filtered. The lithium-containing leachate is oxidized and pH adjusted, and then filtered and separated to obtain a lithium-containing purified liquid and iron hydroxide precipitate. The lithium-containing leachate is further adjusted to a high pH value to remove impurities, and then a saturated sodium carbonate solution is added to precipitate and crystallize to obtain lithium carbonate; the iron hydroxide precipitate is dissolved with dilute acid to prepare a trivalent iron salt solution, which is circulated for the leaching agent. The ferrophosphorus slag including copper and aluminum current collectors is separated by a hydrodynamic screening device to obtain a copper and aluminum current collector mixture and ferrophosphorus slag, and the former is dried and ground and separated by a specific gravity separator to obtain copper powder and aluminum powder. The invention shortens the process flow, and the project investment and production costs are relatively low, and is suitable for large-scale recycling and treatment of waste lithium iron phosphate batteries.

The invention relates to a method for recycling valuable resources from a waste lithium iron phosphate material, and belongs to the technical field of recycling of waste lithium iron phosphate batteries. The method comprises the following steps: dispersing a waste lithium iron phosphate material in water to obtain a mixture I; respectively adding an acid solution and an oxidant solution into the mixture I at the same time to carry out leaching reaction, and carrying out solid-liquid separation to obtain a leaching solution A and active ferrophosphorus slag; iron powder and the leachate A are subjected to a replacement reaction to recover copper in the leachate A, and copper sponge and lithium-rich leachate are obtained; and calcining the active ferrophosphorus slag for crystal transformation to obtain decarbonized ferrophosphorus slag, the decarburized ferrophosphorus slag is mixed with alkali liquor, the mixture is placed in a mill to be subjected to ball-milling leaching, and leachate B and ferric hydroxide are obtained; and adjusting the pH value of the leachate B to be alkaline to obtain an aluminum hydroxide and phosphate solution. The method provided by the invention is simple to operate and low in cost, has good economic benefits and is easy for industrial application.

The invention relates to the technical field of wastewater treatment, in particular to a combined treatment method for phosphorus-containing wastewater and heavy metal-containing wastewater. According to the combined treatment method for the phosphorus-containing wastewater and the heavy-metal-containing wastewater, the phosphorus-containing wastewater and the heavy-metal-containing wastewater are mixed, an iron element in the mixed wastewater is oxidized through an oxidizing agent, the phosphorus element and the oxidized iron element generate an iron phosphate precipitate, and the phosphorus element and the iron element both leave a reaction system; carrying out precipitation reaction on the ferric phosphate precipitate and a sodium hydroxide solution to generate ferric hydroxide precipitate and a sodium phosphate solution, so as to respectively obtain phosphorus-containing sodium phosphate and iron-containing ferric hydroxide precipitate; the removal effect of the phosphorus element and the iron element is improved, and the phosphorus element and the iron element are recycled while the phosphorus element and the iron element are removed.

The utility model belongs to the technical field of chemical equipment, and discloses an iron and boron removal device in magnesium chloride production, which comprises a dissolving kettle, an impurity removal kettle, a heat preservation sedimentation kettle, a first filtering device, an acid adjusting kettle, an iron and boron removal kettle, a second filtering device, a concentration kettle, a crystallization kettle, a centrifugal machine, a drying machine and a packaging machine which are sequentially communicated through pipelines, adjusting valves and pumps, the dissolving kettle is provided with a magnesium chloride crude product feeding hole and a water feeding hole; a liquid material outlet of the first filtering device is communicated to a feeding hole of the acid adjusting kettle, the iron and boron removing kettle is provided with a hydrogen peroxide feeding hole and a ferric hydroxide feeding hole, and a liquid material outlet of the second filtering device is communicated to a feeding hole of the concentration kettle; and a liquid material outlet of the centrifugal machine is communicated with a water feeding hole of the dissolving kettle through a pipeline. According to the device, iron and boron elements in the magnesium chloride crude product are removed, the treatment effect is good, the purity of the obtained product is high, and the application range is wide.

The present invention relates to the technical field of soil remediation, and particularly relates to a stabilizer for contaminated soil remediation and a preparation method thereof. The stabilizer includes: modified neutralization residue a and modified neutralization residue b; the preparation method of the modified neutralization residue a includes: mixing a first part of the neutralization residue with water to obtain a suspension, reacting the suspension at 80-140 °C and a pH value of 10-12, stirring and mixing the reaction product liquid with diatomite, and after solid-liquid separation, obtaining the modified neutralization residue a; the preparation method of the modified neutralization residue b includes: mixing a second part of the neutralization residue with an alkaline material and then calcining to obtain the modified neutralization residue b; in the neutralization residue, the mass content of calcium oxide is 27%-30%, the mass content of calcium sulfate is 34%-38%, and the mass content of iron hydroxide is 16%-20%. When the stabilizer is used to treat contaminated soil, the reduction rate of the leaching concentration of lead and cadmium in the contaminated soil is greater than 80%.

The invention provides a titanium recovery and all-component recycling cooperative treatment method in sulfate process titanium dioxide waste acid. The method comprises the following steps: diffusion dialysis separation, sulfuric acid concentration, metal separation, titanium component recycling, iron and manganese precipitation and precipitation waste liquid treatment. According to the titanium recovery and all-component recycling co-processing method in the sulfate process titanium dioxide waste acid, most free sulfuric acid and impurity ions in the sulfate process titanium dioxide waste acid are removed firstly through the core steps of diffusion dialysis and extraction and / or adsorption, so that a subsequent extraction / adsorption system is converted into a low-acid and low-impurity environment from a high-acid and high-impurity environment, and the titanium recovery and all-component recycling co-processing method in the sulfate process titanium dioxide waste acid is realized. According to the method, the recovery rate of titanium is increased from less than 1% to more than 80%, the efficient recovery of titanium is realized, the recovery of sulfuric acid is realized, high-purity ferric hydroxide and manganese hydroxide products (the recovery rates are both greater than 70%) are produced, and the efficient recycling of waste acid is really realized.

The application provides a method for preparing a magnetic heterostructure material of magnetite-graphene and application of the magnetic heterostructure material in a directional heat-conducting composite material, and belongs to the technical field of composite materials. The method comprises the following steps: (1) slowly adding a sodium hydroxide solution into a ferric chloride solution under water bath condition to prepare a ferric hydroxide gel, and sequentially performing drying and aging, centrifugation, cleaning and freeze drying on the gel to obtain a ferrous oxide nanocrystal; (2) adding the ferrous oxide nanocrystal, graphene and dopamine hydrochloride into a Tris buffer solution and fully stirring, and performing multiple centrifugation, cleaning and freeze drying to obtain ferrous oxide-dopamine-graphene; and (3) performing calcination reduction on the ferrous oxide-dopamine-graphene to obtain the magnetic heterostructure material of magnetite-graphene. The magnetic heterostructure material prepared by the method can be applied to the preparation of the directional heat-conducting composite material as a heat-conducting filler, and has the advantages of high operability, low cost and the like.

The invention discloses a method for recovering iron resources from jarosite, which comprises the following steps: S1, reacting ammonium oxalate with jarosite to realize jarosite phase dissolution: mixing jarosite with ammonium oxalate, and heating and reacting in a water reaction system to generate ammonia gas to obtain leached residues and leached liquid; s2, the leachate reacts with ammonia to precipitate and separate iron, and ammonium oxalate is recycled: S2.1, the leachate reacts with the ammonia: ammonia gas is introduced into the leachate or ammonia water is added into the leachate for full reaction, and reaction product slurry containing ferric hydroxide precipitate and ammonium oxalate is obtained; and S2.2, separating ferric hydroxide and ammonium oxalate from the reaction product slurry: filtering and separating to obtain a ferric hydroxide precipitate, and cooling to separate out crystals from ammonium oxalate in the filtrate so as to recover ammonium oxalate. According to the method, ammonium oxalate used for replacing iron in the iron vitriol can be recycled, the raw material cost is low, iron element separation and utilization are achieved, solid waste is remarkably reduced, and enrichment of other valuable elements in the iron vitriol is facilitated.