205results about "Iron halides" patented technology

The invention discloses a method for recycling iron and manganese and preparing a cementing material by synergistically utilizing electrolytic manganese residues and waste incineration fly ash and a product thereof, the method comprises the following steps: mixing ardealite and electrolytic manganese residues, and uniformly stirring to obtain gypsum manganese residues; calcining the gypsum manganese slag to obtain activated slag; mixing the activated slag material, municipal sludge and waste incineration fly ash, and uniformly stirring to obtain an initial roasting material; the initial roasting material is subjected to continuous pyrolysis carbonization, pyrolysis flue gas dust recycled in the first pyrolysis process is coarse iron powder, pyrolysis flue gas dust recycled in the second pyrolysis process is coarse manganese powder, solid residues obtained in the second pyrolysis process are gelatinized activated residues, the gelatinized activated residues are ground into powder, and the cementing material is obtained. The preparation process is simple, and the required raw materials are only electrolytic manganese residues, waste incineration fly ash and common industrial solid wastes.

The invention provides a positive electrode material and a preparation method thereof, a positive electrode plate, a secondary battery and an electric device. The positive electrode material comprises an inner core, a first coating layer and a second coating layer, wherein the first coating layer coats at least part of the outer surface of the inner core; the second coating layer coats at least part of the outer surface of the inner core with the first coating layer; the material of the first coating layer comprises a lithium element and an X element; and the material of the second coating layer comprises an X element and a Z element. By forming the first coating layer, residual lithium on the surface of the inner core can be eliminated, meanwhile, the first coating layer has relatively high oxygen vacancy formation energy, oxygen dissolution in the inner core can be reduced or even avoided, side reaction between oxygen and electrolyte caused by oxygen dissolution can be reduced or even avoided, the cycle life of the secondary battery is prolonged, and the safety of the secondary battery is improved; the uniform protective film is formed on the surface of the inner core coated with the first coating layer, so that oxygen is reduced or even prevented from overflowing from the position not coated with the first coating layer.

The invention provides a method for preparing an iron-chromium electrolyte and electronic-grade ferrous chloride by using a stainless steel waste liquid. The method comprises the following steps: firstly, adding elemental iron and / or elemental chromium into the stainless steel waste liquid to obtain a chromium-containing ferrous chloride solution; then, sulfide is added, and nickel is removed; adding iron powder to increase the pH value to obtain chromium hydroxide precipitate and a ferrous chloride solution; dissolving chromic hydroxide in hydrochloric acid to obtain a chromic chloride solution; purifying the ferrous chloride solution to obtain an electronic-grade ferrous chloride crystal; and finally, adding a chromium chloride solution, the electronic-grade ferrous chloride crystal and hydrochloric acid according to a certain proportion, and stirring and mixing to obtain the iron-chromium electrolyte. The ferrous chloride prepared by the steps is relatively high in purity and less in waste; meanwhile, the prepared electrolyte is good in electrical property, low in attenuation rate and low in cost, the purpose of comprehensive recycling of resources is achieved, and the general trend of technical improvement is met.

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 method for preparing ferric trichloride and / or phosphoric acid from residues obtained after lithium extraction of failed lithium iron phosphate, which comprises the following steps: S1, taking the residues obtained after lithium extraction, and adding a leaching agent for leaching to obtain a leachate 1 and residues 1; s2, an extraction agent is added into the leachate 1 for extraction, the pH of an oil-water mixed homogeneous phase is controlled to be 0.2-1.0, and phosphorus-containing extraction raffinate 1 and an organic phase containing ferric trichloride are obtained; then the organic phase containing ferric trichloride is subjected to reverse extraction, and a ferric trichloride solution is obtained; the leaching agent in S1 is a hydrochloric acid solution, and the extracting agent in S2 is a tributyl phosphate solution. By the adoption of the method, iron and phosphorus in the slag obtained after lithium extraction are extracted respectively, ferric trichloride and wet-process phosphoric acid can be used for water treatment and chemical production respectively, and recycling of the slag obtained after lithium extraction is achieved.

The invention discloses a method for extracting and recovering metal elements in a lithium battery by using a chlorination method, and belongs to the technical field of lithium battery recovery, the method comprises the following steps: step 1, roasting a lithium battery positive plate to remove organic matters, and stripping to remove aluminum foil to obtain electrode material powder; step 2, placing the electrode material powder on a carrier of a Joule heating device, carrying out thermal shock treatment in a chlorine atmosphere, and heating and chlorinating in stages in the treatment process; step 3, desublimating gas generated after chlorination in each stage; and 4, adding the desublimated solid in each stage into deionized water, mixing, adding a sodium carbonate aqueous solution, collecting the precipitate, washing, and drying to obtain a metal salt product. Based on the characteristics that Joule heat can rapidly heat and accurately control the temperature, by combining the difference between the temperature of chlorination reaction of different metal oxides and the gasification temperature of a chlorinated product, staged gasification desublimation treatment is achieved, different metal chlorides are obtained, and accurate and efficient purification is achieved.

The invention discloses a method for extracting and recovering metal elements in lithium batteries using a chlorination method, which belongs to the technical field of lithium battery recovery. The method comprises the following steps: step 1, calcining the positive electrode sheet of the lithium battery to remove organic matter, and peeling off the aluminum foil to obtain electrode material powder; step 2, placing the electrode material powder on a carrier of a Joule heat device, and performing a thermal shock treatment under a chlorine atmosphere, and the treatment process is staged by stage heating and chlorination; step 3, desublimating the gas generated after chlorination in each stage; step 4, adding the solid after desublimation in each stage to deionized water, adding a sodium carbonate aqueous solution after mixing, collecting the precipitate, washing and drying to obtain a metal salt product. The present invention is based on the characteristics of Joule heat that can heat quickly and accurately control the temperature, combined with the difference in the temperature of the chlorination reaction of different metal oxides and the gasification temperature of the chlorination product, to achieve staged gasification and desublimation treatment, obtain different metal chlorides, and purify accurately and efficiently.

The invention discloses a process for separating and recycling scandium, manganese and iron in iron-manganese slag, and belongs to the technical field of metallurgical engineering and comprehensive utilization of secondary resources. The method comprises the following steps: crushing the iron and manganese slag, mixing the crushed iron and manganese slag with a chlorinating agent and a molten salt medium, and carrying out chlorination reaction at 600-850 DEG C, so that iron and manganese are converted into chlorides to volatilize, and scandium is enriched in the slag; the volatile gas is subjected to multi-stage gradient condensation, and manganese and iron concentrates are respectively recovered in different temperature intervals; and leaching-extracting the chlorination residues to obtain a scandium-rich substance. According to the method, source separation and collaborative recovery of iron, manganese and scandium are achieved through pyrogenic process chlorination-condensation, the problems that in a traditional wet process, metal interferes with one another, the process is long, and pollution is heavy are solved, and the method has the advantages of being short in process, small in pollution and high in recycling degree.

The invention belongs to the technical field of regeneration of waste storage battery positive electrode materials, and particularly relates to a regeneration method of waste lithium iron phosphate and regenerated lithium iron phosphate. The regeneration method of the waste lithium iron phosphate provided by the invention comprises the following steps: mixing a waste lithium iron phosphate positive electrode material containing PVDF, an alkaline lithium source, an iron source and an accelerant, and then sequentially carrying out two stages of calcination treatment in a non-oxidizing atmosphere: in the first stage of calcination treatment, enabling the accelerant to promote the combination of iron and fluorine to generate iron trifluoride; second-stage calcination treatment is carried out to complete carbonization and lithium supplementation of PVDF; the accelerant is ammonium salt. According to the present invention, the reaction between the fluorine generated by PVDF pyrolysis and the iron source is promoted by using the accelerator to generate iron trifluoride so as to inhibit the generation of lithium fluoride, such that the iron trifluoride doping modification is achieved, the hydrocarbon component generated by PVDF pyrolysis is carbonized to form the carbon layer so as to improve the conductivity, and the obtained regenerated lithium iron phosphate has excellent specific capacity and excellent cycle performance.

The invention provides a resource utilization method of iron-aluminum-chromium waste acid, and belongs to the field of waste acid resource treatment. According to the hydrochloric acid type iron-aluminum-chromium waste acid, firstly, high-valence metal in the waste acid is reduced through iron powder, the acidity of a system is reduced, and the iron content is increased; secondly, high-efficiency separation of iron, aluminum and chromium is realized by accurately controlling the sodium phosphate amount, the pH value, the reaction temperature and the stirring rotating speed; and then, oxidizing an iron solution obtained by solid-liquid separation to prepare ferric chloride, and carrying out hydrothermal crystallization on aluminum phosphate and chromium phosphate precipitates to prepare chromium-containing aluminum phosphate which can be used as a catalyst. The method realizes thorough step-by-step separation of metals in the iron-chromium-aluminum hydrochloric acid type waste acid, realizes resource utilization, is free of waste gas and waste residues in the process, meets the green and environment-friendly requirements, and has remarkable environmental and social benefits.

Provided is a method for recovering valuable metals from a positive electrode of waste lithium iron phosphate. The method includes: subjecting a waste lithium iron phosphate battery to discharging and disassembly; subjecting a lithium iron phosphate positive plate obtained by the disassembly to breaking, followed by high temperature treatment; uniformly mixing a product obtained by the high temperature treatment with a carbon material, and roasting a mixture in a high-purity Cl2 atmosphere; subjecting a gas phase product obtained by the roasting to fractional quenching and condensation to recover ferric chloride and aluminum chloride separately; and subjecting a solid phase product obtained by the roasting to water leaching and filtration to obtain a lithium chloride aqueous solution, and then adding sodium carbonate to precipitate lithium carbonate. As a one-step carbothermal chlorination method is adopted in combination with a two-stage quenching and condensation process in the present invention, the use of acidic solutions during recovery of valuable metals from the lithium iron phosphate positive electrode can be avoided, and the use of large amounts of alkaline solutions or extraction agents to separate and recover chlorides step by step is also not required. The method of the present invention has the advantages of a high metal recovery rate, a low comprehensive cost and good economic benefits, social benefits and environmental protection benefits.

The invention relates to a steel surface treatment pickling waste liquid recovery treatment method, and belongs to the technical field of steel pickling waste liquid treatment. The method comprises the following steps: adding hydrochloric acid into the pickling waste liquid to adjust the pH value, introducing oxygen and a catalyst, adding a modified adsorbent, stirring, evaporating and concentrating, adding a stabilizer into a concentrated solution, dropwise adding hydrochloric acid to adjust the pH value to generate polyferric chloride colloid, diluting the polyferric chloride colloid, and filtering to remove impurities to obtain a liquid polyferric chloride product. By optimizing oxidation, evaporation concentration and polymerization reaction processes, efficient recovery of waste acid is achieved, high-purity polyferric chloride is prepared, an iron oxide-carbon composite material oxidation catalyst is prepared from ferric salt and graphene, the catalytic efficiency is improved, mesoporous silica is modified by adopting sulfydryl and amino jointly, and high-purity polyferric chloride is obtained. High-selectivity adsorption on heavy metal under the low-pH condition is achieved, the pickling waste liquid generated in the steel surface treatment process is effectively treated, environmental pollution is reduced, polyferric chloride with the high additional value is recycled and generated, and cyclic utilization of resources is achieved.

The present invention discloses a method for separating nickel and iron from a nickel-iron alloy by chlorination roasting: (1) placing the nickel-iron alloy in a roasting furnace; (2) introducing a gaseous chlorinating agent into the roasting furnace for staged roasting to obtain roasting slag and a roasting gas phase; wherein the gaseous chlorinating agent is a mixture of chlorine and gaseous ferric chloride; and (3) condensing the roasting gas phase obtained in step (2) in stages to obtain solid ferric chloride and liquid silicon tetrachloride, respectively. The present invention controls the composition of the chlorinating agent during the chlorination roasting process to achieve selective and directional volatilization of iron into the gas phase while preventing nickel from being chlorinated. Thus, nickel and iron in the nickel-iron alloy can be separated in a single step, and the process flow is short.

The invention discloses a ZnF2 (at) FeF3. 0.33 H2O positive electrode material as well as a preparation method and application of the ZnF2 (at) FeF3. 0.33 H2O positive electrode material. The preparation method comprises the following steps: step 1, uniformly mixing ethanol and PEG-400 to obtain a mixed solvent; 2, ferric nitrate and zinc nitrate are dissolved in a mixed solvent, then an HF aqueous solution is dropwise added into the obtained solution under stirring, after stirring, the obtained mixed solution is transferred into a stainless steel high-pressure kettle to be heated in a closed mode and cooled to the room temperature, a product is washed, centrifuged and dried in vacuum, and powder is obtained; 3, the powder is placed in a tubular furnace and subjected to heat preservation treatment in the argon atmosphere, then the powder is naturally cooled to the room temperature, a product is taken out and ground, and the ZnF2-coated FeF3. 333 H2O material is obtained. By doping ZnF2, FeF3. 0.33 H2O has higher electronic conductivity and a more stable structure, and an all-solid-state lithium battery prepared from the FeF3. 0.33 H2O has higher specific capacity and better cycling stability.

The invention discloses an electronic waste efficient chlorination comprehensive recovery device and method, and relates to the technical field of chemical metallurgy, the electronic waste efficient chlorination comprehensive recovery device comprises a chlorination reaction cavity, a heating system, a vacuum system, an atmosphere control system and a condensation separation system; the heating system is used for controlling the temperature of the chlorination reaction cavity; the vacuum system is communicated with the heating system; the atmosphere control system comprises a chlorine gas source and a protective gas source; and the temperature of the condensation separation system is gradually reduced. Through the high-purity graphite heating assembly, the sealing structure and the atmosphere control system, the highest heating temperature is 1700 DEG C, the temperature limit of 1200 DEG C of a traditional quartz tube furnace can be broken through, the chlorine corrosion problem is solved, chlorine is not leaked, and the environment is not polluted. High-valued recovery of different metal resources can be achieved through low-temperature pyrolysis, high-temperature chlorination volatilization and three-stage condensation settling separation, and the method has the advantages of being low in energy consumption, high in recovery rate, environmentally friendly and the like and is suitable for industrial metal resource recovery.

The present invention provides a method for recycling lithium batteries, including the following steps: Step 1, pretreating the lithium batteries, so as to obtain a mixture, the mixture includes positive electrodes of batteries, negative electrodes of batteries, and electrolyte; Step 2, performing oxygen-free pyrolysis on the mixture, at a pyrolysis temperature of 400-600° C.; Step 3, using a gas-solid filtration device to separate gas products from the pyrolysis, wherein anti-corrosion material(s) is (are) used to form filter element of the gas-solid filtration device; Step 4, taking out solid products from the pyrolysis, so as to recycle metal elements; the metal elements include but are not limited to one or more selected from the following: lithium, aluminum, copper, iron, nickel, cobalt, manganese.

The invention discloses a method for recycling valuable metals from nickel-cobalt-containing iron-aluminum slag resources, and relates to the technical field of waste slag recycling. Comprising the following steps: roasting: mixing and roasting the nickel-cobalt-containing iron-aluminum slag and a chlorinating agent, and controlling the roasting temperature to obtain roasted slag and roasted flue gas; step-by-step condensation is carried out, and ferric chloride, aluminum chloride and zinc chloride in the roasting flue gas are recycled; or step-by-step condensation is carried out, and ferric chloride and aluminum chloride in the roasting flue gas are recycled; and nickel and cobalt in the roasting slag are leached and recycled. According to the method, iron, aluminum and zinc are preferentially volatilized and separated through roasting, iron, aluminum and zinc are prevented from entering the nickel-cobalt leaching solution in the leaching process, and nickel, cobalt, iron, aluminum and zinc in the iron-aluminum slag containing nickel and cobalt are effectively separated and recycled.

The invention discloses a preparation method of a stable, safe and reliable iron chloride product, and relates to the technical field of inorganic compounds ferric chloride and ferrous chloride. The preparation method provided by the invention comprises the following steps: applying an electric field to iron and hydrochloric acid in a device to change an electrochemical potential, so that the iron is subjected to chemical replacement and electrochemical reaction, and the iron is directly dissolved in the acid to form ferrous chloride or ferric chloride. By controlling the reaction conditions, flammable and explosive hydrogen generated in the general replacement reaction is avoided, the safety of the chemical process is greatly improved, and the requirements on the production conditions are reduced. Meanwhile, the reaction speed can be increased, the reaction is thorough, and the reaction efficiency and the utilization rate of raw materials and equipment are improved. The obtained solution can be concentrated, crystallized and the like to obtain a solid product.

The invention discloses a method for co-processing chromium-containing aluminum mud and electrolytic aluminum overhaul slag, which comprises the following steps of: oxidizing cyanide in the finely ground overhaul slag into carbon dioxide and nitrogen by using hexavalent chromium with strong oxidizing property in the chromium-containing aluminum mud under an acidic condition, and adding calcium oxide into decyanated slag to obtain trivalent chromium precipitate and insoluble villiaumite; and chloridizing the washed and dried precipitation slag by adopting aluminum chloride, carrying out multi-stage condensation separation and purification on the chloridized flue gas to respectively obtain ferric trichloride and aluminum trichloride, carrying out heat exchange and washing on the chloridized slag to obtain a chromium trichloride solution, and carrying out alkaline leaching to obtain sodium aluminate and tailings. According to the method, oxidation-reduction characteristics of the chromium-containing aluminum mud and the overhaul slag are utilized to cooperate with detoxification, a carbon-based wave-absorbing material in the overhaul slag is subjected to microwave heating for chlorination recovery of valuable elements, the heating rate is high, heating is uniform, the reaction efficiency is high, harmless treatment of the two hazardous wastes is achieved, the valuable elements such as chromium and aluminum in the hazardous wastes are effectively recovered, and the method is suitable for industrial production. And the energy utilization rate is high.

The invention provides a method for preparing a poly-aluminum and functional silicon material by activating coal gasification slag and waste hydrochloric acid through microwave synergistic mechanical force, and belongs to the technical field of industrial solid waste recycling. The method comprises the following steps that the coal gasification slag is sequentially subjected to microwave radiation treatment and ball milling, activated slag and waste hydrochloric acid are subjected to an acid leaching reaction, and aluminum-iron-containing leachate and silicon-rich slag are obtained; extracting the aluminum-iron-containing leaching solution to obtain an iron-rich organic phase and a purified aluminum chloride solution; performing thermal polymerization reaction on the purified aluminum chloride solution to obtain polyaluminum chloride; the method comprises the following steps: carrying out alkaline leaching reaction on silicon-rich slag and waste alkali liquor, adding a structure-directing agent into a sodium silicate solution, and sequentially carrying out aging, solution pH value adjustment and crystallization precipitation to obtain mesoporous silica. According to the method, the aluminum-silicon leaching rate is remarkably increased through microwave-mechanical force synergistic activation, synergistic and efficient treatment of the three kinds of waste including the coal gasification slag, the waste hydrochloric acid and the waste alkali liquid is achieved, the technological process is closed, the product additional value is high, and the environmental and economic benefits are remarkable.

The invention belongs to the technical field of rutile mother liquor recovery, and particularly relates to an artificial rutile mother liquor recovery processing device and method, and the artificial rutile mother liquor recovery processing device comprises a fluidized bed and a cyclone separator; an air outlet barrel is fixedly connected to the interior of the cyclone separator; a heat exchange channel is arranged on the side wall of the air outlet cylinder; the heat exchange channel is designed to be spiral and is coiled along the side wall of the air outlet barrel; one side of the heat exchange channel is located in an annular gap between the air outlet barrel and the cyclone separator, and the other side of the heat exchange channel is located in the air outlet barrel. By integrating roasting, separating and drying functions, the adaptability of the fluidized bed to an artificial rutile mother liquor recovery treatment process is improved, so that the fluidized bed is highly matched with the process characteristic of drying undehydrated ferric chloride by using the waste heat of roasting tail gas, and high-temperature tail gas exchanges heat in two directions along the two sides of the spiral heat exchange channel in the drying process; ferric chloride in the heat exchange channel can be fully and uniformly heated, and moisture in the ferric chloride is promoted to be quickly vaporized and lost.

The invention provides a waste gypsum treatment method. The treatment method comprises the following steps: S1, carrying out reduction reaction on waste gypsum and a reducing agent to obtain a product containing CaS; s2, the product containing CaS and chlorine are subjected to a chlorination reaction, and CaCl2 and flue gas are obtained; and S3, the flue gas is subjected to fractional condensation, and sulfur and FeCl3 are obtained. In the step S2, the product containing CaS and chlorine are subjected to a chlorination reaction, CaS and chlorine react to generate CaCl2 and sulfur, the iron element in the product containing CaS is chlorinated to form FeCl3, and both sulfur and FeCl3 are separated from CaCl2 along with flue gas. By consuming the waste gypsum and chlorine, the problem of stockpiling of the waste gypsum at present is solved, chlorine consumption in the chlor-alkali industry is achieved, products such as sulfur, anhydrous calcium chloride and ferric chloride with high value can be obtained, and the recovery rate of calcium, sulfur and iron is high.

The application discloses polymeric ferric chloride and a production process and application thereof, and preparation of the polymeric ferric chloride comprises the following steps: S1, mixing waste acid with iron oxide scale, adjusting acidity, heating and refluxing, and cooling to obtain a mixture; S2, adding an oxidizing agent and a stabilizer into the mixture, and continuously heating and reacting to obtain the polymeric ferric chloride; the stabilizer is a chitosan-desferrioxamine complex; the polymeric ferric chloride is prepared by using a catalytic oxidation method, the chitosan-desferrioxamine complex stabilizer is used to chelate Fe, the stability of the polymeric ferric chloride is improved, the hydrolysis of Fe is inhibited, and the process is beneficial to improving the total iron content in the polymeric ferric chloride and improving the flocculation effect of the polymeric ferric chloride in sewage treatment.

The present invention belongs to, but is not limited to, the technical field of photocatalytic materials, and discloses a Fe8O8(OH)8Cl 1.35 catalyst, its preparation method and uses. Using ferric chloride hexahydrate as raw material, it is prepared by a low-temperature calcination method. The prepared Fe8O8(OH)8Cl 1.35 nanomaterials have a microscopic structure of a cluster structure composed of nanorods. The rod cluster particle size is about 100 - 1000 nm, and the surface contains abundant unsaturated bonds as adsorption sites. Different from the traditional preparation method of controlling by adding activators through hydrothermal method, this invention adopts a solid-phase reaction preparation method, enriching the synthesis method of Fe8O8(OH)8Cl 1.35 rod-shaped nanomaterials. The Fe8O8(OH)8Cl 1.35 nanomaterials prepared by the method of the present invention exhibit obvious photocatalytic performance.

A process for recovering titanium dioxide from a titanium-bearing material, the process including the steps of: leaching the titanium-bearing material in a first leaching step at atmospheric pressure and at a temperature of 70 to 97° C. with a first lixiviant to produce a first leach solution comprising undissolved first leach solids that include a titanium content and a first leach liquor, the first lixiviant comprising hydrochloric acid at a concentration of less than 23% w / w; separating the first leach liquor and the undissolved first leach solids; leaching the first leach solids in a second leaching step at atmospheric pressure and at a temperature of 60 to 80° C. with a second lixiviant in the presence of a Fe powder reductant to produce a second leach solution comprising undissolved second each solids and a second leach liquor that includes a leached titanium content and iron content, the second lixiviant comprising a mixed chloride solution comprising less than 23% w / w hydrochloric acid and an additional chloride selected from alkali metal chlorides, magnesium chloride and calcium chloride, or mixtures thereof; separating the second leach liquor and the undissolved second leach solids; and thereafter separating the titanium dioxide and the iron content from the second leach liquor by precipitation, and regenerating the second lixiviant for recycle to the second leaching step.

The invention provides a treatment method of chlorination process titanium dioxide solid waste residues, and belongs to the technical field of resources and environments. According to the method, the chlorination process titanium dioxide solid waste residues are dissolved and extracted step by step, high-value metal in the solid waste residues is recycled respectively, residual substances are evaporated and crystallized to obtain mixed salt, and zero emission and full resource utilization of the solid waste residues are achieved.

The invention provides a method for treating chlorination furnace tail gas in chlorination process titanium dioxide production, which is characterized in that primary filtrate obtained by dissolving dust collection slag generated by a chlorination furnace with water and then filtering is used for selectively absorbing chlorine in the chlorination furnace tail gas, the concentration percentage of Fe < 2 + > in the primary filtrate is 0.5%-12%, the concentration percentage of HCl is 0.1%-10%, and the concentration percentage of Cl is 0.1%-10%. Ferric chloride and chlorine in the primary filtrate react to generate ferric trichloride, chlorine in the tail gas of the chlorination furnace is removed, meanwhile, the primary filtrate is acidic and is prevented from reacting with carbon dioxide contained in the tail gas of the chlorination furnace to generate low-solubility carbonate, the output of waste is reduced, and the production cost is reduced. The problem that low-solubility carbonate generated in the chlorine gas absorption process through traditional alkali washing is separated out in a leaching tower and a pipeline, and consequently the leaching tower and the pipeline are blocked is solved. Meanwhile, the waste liquid is recycled, the treatment cost of the tail gas of the chlorination furnace is reduced, the ferric chloride solution generated after the chlorine gas is absorbed by the primary filtrate can be recycled, and the subsequent environmental protection problem is avoided.

The invention relates to a method for producing iron chloride and aluminum chloride, characterized in that i) sludge ash containing at least one iron compound and aluminum compound is reacted with at least one alkali metal chloride and / or at least one alkaline earth metal chloride at a temperature of 200 to 1100 DEG C in an inert atmosphere, and ii) discharging and separating the formed iron chloride and aluminum chloride in an exhaust stream.

The invention discloses porous ferric fluoride, a preparation method and application of the porous ferric fluoride in a lithium ion battery, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: stirring Lewis alkali and iron-containing Lewis acid under a heating condition to form a clear solution, adding a carbon source into the clear solution, and stirring to form uniform slurry; adding ammonium bifluoride, continuously stirring, alternately washing the obtained precipitate with ethanol and acetone, centrifuging until the supernatant is colorless and transparent, and drying to obtain a precursor; and finally, uniformly grinding the precursor, performing heat treatment, naturally cooling to room temperature, and fully grinding to obtain the porous ferric fluoride. The preparation process is simple and safe, the cost is low, the use of dangerous chemicals hydrofluoric acid and nitrogen fluoride is avoided, and large-scale synthesis can be realized; the prepared ferric fluoride has a porous morphology, is beneficial to electrolyte infiltration, ensures that the electrical contact between active particles is not influenced while the active material is in full contact with the electrolyte, and improves the electrochemical performance.

The invention discloses high-purity electronic-grade ferrous chloride, a preparation method thereof and application of the high-purity electronic-grade ferrous chloride in preparation of iron phosphate. According to the method disclosed by the invention, industrial-grade ferrous chloride tetrahydrate with low cost is taken as a raw material, and high-purity ferrous chloride solid can be obtained by washing without evaporative crystallization in the whole process, so that the production energy consumption is greatly reduced, the production efficiency is improved, and the production cost is reduced; and the obtained high-purity ferrous chloride solid meets the requirements of producing high-quality ferric trichloride and further producing battery-grade iron phosphate.