168results about "Preparation from chlorides" patented technology

The invention provides an electro / thermochemical gradient hydrogen production system and method for solar radiation energy grading and residual light energy thermal complementary coupling. The system comprises a light condensation assembly; the frequency division assembly is used for grading solar spectrum radiation; a photovoltaic cell power generation device; the methane oxygen-enriched combustion high-temperature photovoltaic power generation device is used for realizing oxygen-enriched combustion of natural gas by utilizing residual heat heat energy and generating power by utilizing radiation energy generated by high-temperature flue gas generated after combustion; the solid oxide electrolytic tank device is used for pushing solid oxide to electrolyze water to produce hydrogen by utilizing heat energy and electric energy contained in the high-temperature flue gas step by step; and the thermal chemical reaction device is used for promoting each step of thermal chemical reaction by utilizing heat energy and electric energy contained in the high-temperature flue gas step by step. The energy source of the system is solar radiation and natural gas, hydrogen and electricity are produced, the system utilizes different energy conversion modes to achieve temperature gradient ordered conversion and utilization of residual light energy after solar frequency division, and complementary coupling of different qualities is achieved on the basis of energy gradient conversion.

The invention discloses a casing tubular reactor for preparing chlorine by oxidizing hydrogen chloride, which comprises a main body, and a lower seal head and an upper seal head which are respectively arranged at the bottom end and the top end of the main body, a casing reaction tube is arranged in the main body, and the casing reaction tube comprises a central tube and a jacket which is arranged on the outer wall of the central tube in a surrounding manner. A heating medium flows through the central pipe and the jacket, so that the heat exchange area is increased, and the heating medium is timely moved away from the reactor to take away heat generated by heat release of oxidation reaction, so that excessive concentration of bed reaction heat is avoided; and the obvious defect of traditional reaction equipment in the aspect of heat removal is overcome, the problems that the reaction efficiency is limited and the energy consumption is high are solved, and the reaction efficiency can be greatly improved. The invention also provides a system and a method for preparing chlorine by oxidizing hydrogen chloride, which realize recycling of reaction heat, reduction of energy consumption, recycling of tail gas discharged from an absorption tower after treatment, improvement of the utilization rate of raw materials, closed-loop operation of chlorine elements and reduction of the production cost.

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 a preparation method of a high-capacity silicon-carbon composite negative electrode material, which comprises the following steps: preparation of electronic-grade hydrochloric acid, preparation of a photovoltaic waste silicon powder ball mill, preparation of a silicon-coated calcium carbonate core-shell structure material, preparation of a gradient carbon coating layer, synthesis preparation of a carbon nanotube conductive network, preparation of a graphene nanobelt silicon-carbon composite material and the like. The preparation method creatively combines a two-step electrostatic attraction self-assembly method, a high-temperature oxidation process and other preparation methods, the prepared silicon-carbon composite material shows stable cycle performance and high capacity performance, and the silicon-carbon composite material has the advantages of high specific capacity and low impedance.

The utility model belongs to the field of chemical raw material recovery, and discloses a system for separating salt and extracting bromine from purified terephthalic acid membrane concentrated water. The system comprises a thermal decomposition device, a nanofiltration device, a static mixer and a bromine extraction rectification device. The utility model solves the technical problems that the acid consumption is large before bromine is extracted from purified terephthalic acid wastewater, and poisoning is easily caused by leakage hidden danger in the transportation and storage process of liquid chlorine.

The invention provides a Cu-based catalyst for preparing chlorine through catalytic oxidation of hydrogen chloride and a preparation method and application of the Cu-based catalyst, the catalyst takes aluminum oxide as a carrier, the catalyst contains 2-10 wt% of Cu, 0.0001-0.5 wt% of S and 0.0001-0.5 wt% of P, the Cu content of the unit specific surface area of the catalyst is 1-50 * 10 <-4 > g / m < 2 >, and the conductivity of the catalyst dispersed in water with the same mass is 1-100 mS / cm. Although the Cu loss sign exists in the use process of the catalyst, the Cu content of the unit specific surface area of the catalyst does not decrease along with the extension of the reaction time, so that the activity is maintained. The catalyst provided by the invention overcomes the phenomenon of activity decline caused by Cu loss in the long-time use process, can realize industrial long-period stable operation, and has very high application value.

Embodiments of the present disclosure are directed to systems and methods of removing carbon dioxide from a gaseous stream using magnesium hydroxide and then regenerating the magnesium hydroxide. In some embodiments, the systems and methods can further comprise using the waste heat from one or more gas streams to provide some or all of the heat needed to drive the reactions. In some embodiments, magnesium chloride is primarily in the form of magnesium chloride dihydrate and is fed to a decomposition reactor to generate magnesium hydroxychloride, which is in turn fed to a second decomposition reactor to generate magnesium hydroxide.

The embodiment of the invention relates to the field of separation by using a physical or chemical method, in particular to chloride molten salt purification equipment and a purification method. The chloride molten salt purification equipment comprises a containing part maintaining assembly, a purification furnace body, a purification furnace cover body, a furnace cover movement mechanism and a purification moving assembly. The accommodating part holding assembly is used for holding a plurality of molten salt accommodating parts; the purification furnace cover body is used for opening or closing a top opening of the purification furnace body and forms a reaction space together with the purification furnace body; the furnace cover movement mechanism is used for driving the purification furnace cover body to lift and rotate, so that the top opening is completely opened or closed; the purification moving assembly is used for driving the containing part maintaining assembly to move in the reaction space, and when the top opening is completely opened, the purification moving assembly drives the containing part maintaining assembly to move to protrude out of the top opening. According to the chloride molten salt purification equipment provided by the embodiment of the invention, the discharging efficiency and the feeding efficiency of the chloride molten salt after the chloride molten salt is purified can be improved.

The present application relates to a kind of catalyst for hydrogen chloride oxidation preparation chlorine and its preparation method and application.The preparation method includes: after carrier substrate, metal tantalum powder, binder solution are mixed, extrusion forming is obtained green body, the green body is prepared composite carrier by calcination, the mass fraction of metal tantalum powder in the composite carrier is 5%-30%;Inorganic salt containing catalytically active element is made into solution and is placed in the composite carrier, and after drying, pre-product is obtained, and the pre-product is prepared catalyst by calcination.The preparation method described in the present application prepares high thermal conductivity composite carrier, not only effectively improves the heat conduction efficiency of catalyst, guarantees the effective activity of catalyst, but also guarantees the stability of composite carrier, thereby effectively prolongs the life of catalyst.

The utility model relates to a wastewater treatment and recovery device. The wastewater treatment and recovery device comprises a first recovery assembly and a second recovery assembly, the first recovery assembly comprises a first storage tank, a second storage tank, a first connecting pipeline, a second connecting pipeline and a first reaction kettle, the first reaction kettle comprises a first reaction kettle body, the first storage tank is communicated with the first reaction kettle body through the first connecting pipeline, and the second storage tank is communicated with the first reaction kettle body through the second connecting pipeline. The second recovery assembly comprises a third connecting pipeline, a second reaction kettle and an evaporative crystallization structure, the second reaction kettle comprises a second reaction kettle body, the second reaction kettle body is communicated with the first reaction kettle body through the third connecting pipeline, and the evaporative crystallization structure is communicated with the second reaction kettle body. According to the technical scheme, the problem that in the prior art, the recycling rate of recoverable components in waste water raw materials is low is effectively solved.

The invention discloses a production method and a production system of high-purity phosphorus trifluoride and hydrogen chloride, and belongs to the field of preparation of phosphorus trifluoride and hydrogen chloride. The production method comprises the following steps: reacting phosphorus trichloride with anhydrous hydrogen fluoride to generate phosphorus trifluoride and hydrogen chloride, condensing at-20 DEG C to 0 DEG C, refluxing phosphorus trichloride and hydrogen fluoride raw materials, and outputting mixed gas of phosphorus trifluoride and hydrogen chloride; preliminarily rectifying the mixed gas to obtain a phosphorus trifluoride crude product and a hydrogen chloride crude product; the method comprises the following steps: carrying out primary rectification on a phosphorus trifluoride crude product in a phosphorus trifluoride rectification heavy component removal tower and carrying out secondary rectification in a phosphorus trifluoride rectification light component removal tower in sequence to obtain high-purity phosphorus trifluoride gas; the crude hydrogen chloride is subjected to primary rectification in a hydrogen chloride rectification heavy component removal tower and secondary rectification in a hydrogen chloride rectification light component removal tower in sequence, and high-purity hydrogen chloride gas is obtained. According to the production method, high-purity phosphorus trifluoride and high-purity hydrogen chloride can be continuously produced and obtained, meanwhile, the raw material utilization rate can be increased, the product yield can be increased, meanwhile, little waste gas is generated, the waste gas can be completely absorbed, and the requirement for environmental protection is met.

The invention discloses a hydrogen chloride gas absorption device-modified double-path pure water absorption system and a process method, and relates to the technical field of chemical waste gas treatment and resource recovery. The device comprises a hydrochloric acid synthesis furnace, a first-stage falling film absorber, a second-stage falling film absorber, a combined tail gas absorption tower and a tail gas purification unit which are sequentially connected, as well as a pure water supply system and an automatic control system. The system is characterized in that the pure water supply system is divided into two independent branches through a water inlet header pipe to be connected to the combined tail gas absorption tower, and each branch is provided with an automatic regulating valve. According to the method, a traditional single-path water absorption system is transformed into a double-path standby system through low-cost technical improvement of an existing single-path absorption device, automatic and rapid switching to the other path when one path breaks down is achieved, and therefore the problems that in the prior art, production is discontinuous, product concentration fluctuation is large, and potential safety hazards exist are effectively solved; the effects of efficiently, continuously and safely producing high-concentration hydrochloric acid and realizing near-zero emission of tail gas are achieved.

The invention discloses a ferric chloride low-temperature solid-phase oxidation method which comprises the following steps: carrying out microwave pretreatment on a ferric chloride solid raw material, and heating the ferric chloride solid raw material to 80-120 DEG C to obtain preheated and activated ferric chloride; oxygen is preheated to 250-300 DEG C and then subjected to a low-temperature oxidation reaction with preheated and activated ferric chloride, the temperature of the low-temperature oxidation reaction is 200-320 DEG C, crude iron oxide and chlorine are obtained, and the crude iron oxide is a mixture of mica iron oxide and ferric chloride; and heating and separating ferric chloride in the crude iron oxide to obtain a mica iron oxide product. The ferric chloride raw material is preheated and activated through the microwave pretreatment technology, the activation energy of the oxidation reaction is reduced, and then the temperature range required by raw material preheating is reduced, so that the solid-phase oxidation reaction can be carried out at a relatively low temperature; therefore, the heating energy consumption is greatly reduced on the premise of ensuring high product yield and purity, the generated three wastes are few, and the method is green and environment-friendly.

The invention discloses a green synthesis method of electronic-grade methylsilane and hydrogen chloride based on an ionic liquid catalyst, belongs to the technical field of synthesis of organosilicon compounds and high-purity electronic special gases, and discloses a green synthesis method of electronic-grade methylsilane and hydrogen chloride based on an ionic liquid catalyst. Comprising the following steps of S1, catalyst preparation, S2, methylsilane and hydrogen chloride preparation, S3, product purification and S4, activated carbon regeneration, 1-ethyl-3-methylimidazole aluminum chloride as the catalyst has good thermal stability and catalytic activity, the risk of catalyst inactivation is avoided, the catalyst can be pumped into a reaction kettle, the whole process is operated in a closed mode, and operation is easy. The method is safe, reliable and environment-friendly, and meanwhile, regeneration and recycling of the activated carbon bring a better use prospect.

In some embodiments the application pertains to processes comprising reacting a component comprising an alkaline earth weak acid with a component comprising an acid to form a component comprising an alkaline earth acid anion and a component comprising a weak acid derivative. At least a portion of the component comprising the alkaline earth acid anion is reacted with a component comprising an alkali sulfate to form a component comprising alkaline earth sulfate and a component comprising an alkali acid anion. At least a portion of the component comprising alkaline earth sulfate is decomposed to form a component comprising alkaline earth oxide, or alkaline earth hydroxide, or alkaline earth carbonate, or alkaline earth sulfide, or a derivative thereof, or any combination thereof, and a component comprising sulfur dioxide, or oxygen, or sulfur trioxide, or a derivative thereof, or any combination thereof.

The present invention relates to a process for producing isocyanates and, optionally, polyurethanes, by at least synthesizing (1) phosgene (20) from carbon monoxide (21) and chlorine (22); reacting (2) phosgene (20) with a diamine (23) to produce a diisocyanate (24) and hydrogen chloride (25); providing a carbon dioxide gas stream (31); and cleaning (4) the carbon dioxide gas stream (31) with additional components, wherein the carbon dioxide is converted by a RWGS reaction (6) to produce carbon monoxide (21) and hydrogen (29), which are used as raw materials for polyurethane production, and optionally reacting (3) the diisocyanate (24) with a polyether polyol (35a) and / or polyester polyol (35b) to produce polyurethane (37).

This invention provides a method for preparing a platinum-ruthenium catalyst for chlorine production, comprising: mixing nitrosylruthenium nitrate, platinum nitrate solution, deionized water, and a dispersant; heating to reflux temperature to dissolve; continuing the reaction at reflux temperature for 1 hour after the system changes from brownish-red to brownish-black; filtering the system after cooling to room temperature; and mixing the platinum-ruthenium mixture, silica hydrosol, and silica powder. The mixture is extruded into cylindrical pieces with a diameter of 5 mm, dried at 100-120°C for 6 hours to a breakage length of approximately 3-5 mm, and calcined in air at 200-240°C for 12 hours to obtain the platinum-ruthenium catalyst. This method can prepare a platinum-ruthenium catalyst with low chlorine impurity content that easily leads to catalyst aging. Simultaneously, because the reaction system remains acidic, the occurrence of ruthenium hydrolysis side reactions is reduced, resulting in a platinum-ruthenium catalyst with high yield, high ruthenium dispersion, and high catalyst activity.

The invention discloses an extraction and separation method for recycling low-concentration ammonia water and hydrochloric acid, which comprises the following steps: saponifying an acidic extractant, extracting and separating the saponified extractant from a mixed metal chloride solution to generate a loaded organic phase and a low-concentration ammonium chloride solution, reextracting the loaded organic phase with diluted hydrochloric acid after extraction and separation, and separating the low-concentration ammonium chloride solution from the loaded organic phase. A grouped or single metal chloride solution is obtained; the low-concentration ammonium chloride wastewater is subjected to oil removal treatment and metal impurity ion removal treatment to obtain a purified ammonium chloride solution; separating the purified ammonium chloride solution to obtain diluted hydrochloric acid, diluted ammonia water and light salt brine; diluted hydrochloric acid is used for back extraction or dissolution of an extracted component precursor, diluted ammonia water is reused for saponification of an acidic extractant, and low-salt fresh water generated by a BMED system is returned to an extraction washing section for enrichment and regeneration or concentrated hydrochloric acid diluent. The invention solves the problem of recycling low-concentration ammonia water / hydrochloric acid.

The invention discloses a method for comprehensively recycling high and low boiling residues and waste acid in the production process of high-purity antimony, and relates to the field of non-ferrous metal metallurgy. The method comprises the following steps: mixing high and low boiling residues produced in the preparation process of high-purity antimony with waste acid produced by cleaning equipment, spraying the mixed solution into a roasting tower through compressed air for roasting, and enabling roasted flue gas to sequentially pass through a settling chamber, a bag collector and a two-stage water spraying absorption tower to respectively produce antimony white and hydrochloric acid, the produced antimony white can be directly sold or used as an antimony smelting raw material, and the byproduct hydrochloric acid can be used as an acid for wet smelting or can be further concentrated into 35-38% concentrated hydrochloric acid. The method can realize gradient recycling of antimony and chlorine elements in the high and low boiling residues and the waste acid, has the characteristics of high resource utilization level and no generation of a large amount of wastewater, and has good economic value and environmental protection benefit.

The utility model relates to the technical field of chemical gas recovery, and provides a device for separating trichlorosilane tail gas and co-producing fumed silica, which adopts a combined process to treat the trichlorosilane tail gas and is provided with a rectification separation seat provided with a low-temperature cold energy recovery mechanism. Hydrogen, hydrogen chloride and chlorosilane in the tail gas are separated step by step through the rectification separation assembly, the hydrogen chloride and the chlorosilane are directly conveyed to the combustion assembly, the purity of the hydrogen chloride is recycled to the trichlorosilane tail gas treatment assembly, recycling after separation is achieved, and the purposes of further saving energy consumption and improving the purity are achieved; a fumed silica combustion furnace suitable for low-boiling-point chlorosilane is adopted, so that the chlorosilane and hydrogen are mixed and combusted to generate fumed silica and hydrogen chloride, and the fumed silica can be directly discharged through a fumed silica discharge pipe; and the generated hydrogen chloride is recovered into the trichlorosilane tail gas treatment seat through a second hydrogen chloride return pipe, and closed-loop utilization is realized.

The utility model discloses a multifunctional chemical experiment device, which belongs to the technical field of teaching aids and comprises a main body, the main body comprises a three-neck cylindrical flat-bottomed flask, a bottle cavity is arranged in the three-neck cylindrical flat-bottomed flask, and three groups of distributed open piles are arranged on the top surface of the three-neck cylindrical flat-bottomed flask. According to the property verification device, experiment operation and teaching processes are carried out through the bottle cavity in the three-neck cylindrical flat-bottomed flask, heating is not needed in the gas preparation process, the acid amount is controlled at any time, the pressure intensity generated by Cl2 can be automatically adjusted through the balloon communicated with the top surface of the three-neck cylindrical flat-bottomed flask, the safety coefficient is high, and the experiment efficiency is high. Redundant Cl2 in the experiment process can be automatically absorbed by soda lime in the balloon and can also be absorbed by injecting a sodium hydroxide solution through the glass charging valve, so that the operation is more convenient, the whole experiment is performed in a sealed environment, the mouth part is polished, the sealing performance is good, the environment is protected, the Cl2 can be effectively prevented from polluting the environment, and the environmental awareness of students is enhanced.

This invention discloses an apparatus for producing hydrogen chloride from carbon tetrachloride, belonging to the field of hydrogen chloride process technology. It aims to solve the problem in existing technologies where the reaction of carbon tetrachloride with water produces toxic phosgene if too little water is used, and hydrogen chloride and carbon dioxide gases are produced if too much water is used. Since the boiling points of these two gases are very close at atmospheric pressure, separation is difficult. The apparatus includes a carbon tetrachloride storage tank and a pure water tank, each equipped with a heater. A first valve is installed on the carbon tetrachloride storage tank, and a second valve is installed on the pure water tank. The carbon tetrachloride storage tank is connected to a first heat exchanger, which is connected to a first gas pump. The pure water tank is connected to a second heat exchanger, which is connected to a second gas pump. The second and first gas pumps are connected to a mixing mechanism, which is connected to a tubular hydrolysis reactor. A concentrated sulfuric acid contact tower is connected to the tubular hydrolysis reactor.

The invention discloses a CeO2 loaded Fe-B catalyst as well as preparation and application thereof. The CeO2 loaded Fe-B catalyst is prepared by a preparation method comprising the following steps: (1) loading ferric salt on a CeO2 carrier by wet impregnation, then drying and calcining in a nitrogen atmosphere to obtain a calcined product, and dispersing the calcined product in water to obtain a dispersion liquid; and (2) under the protection of nitrogen, dropwise adding a boron-alkali mixed solution into the dispersion liquid, stirring to react, separating, washing and drying the generated precipitate after the reaction is finished, and finally calcining the dried product under the protection of nitrogen to obtain the CeO2 loaded Fe-B catalyst. The invention provides application of the CeO2-loaded Fe-B catalyst in preparation of chlorine by catalytic oxidation of hydrogen chloride. By optimizing the preparation process, the catalyst has excellent activity and stability, so that the efficiency of converting HCl into Cl2 is greatly improved, and meanwhile, the cost and the environmental burden are reduced.

The invention relates to a method and a device for preparing chlorine through catalytic oxidation of hydrogen chloride. The method comprises the following steps: pretreating hydrogen chloride gas by adopting a pretreater filled with titanium dioxide, and reacting part of hydrogen chloride gas with titanium dioxide to obtain hydrogen chloride gas flow containing hydrogen chloride, water and titanium tetrachloride; the hydrogen chloride gas flow and oxygen are subjected to a catalytic oxidation reaction in a reactor containing a catalyst, and chlorine is obtained; in the hydrogen chloride gas flow at the outlet of the preprocessor, the mass content of titanium tetrachloride is 1-10ppm; the catalyst comprises a titanium dioxide carrier. According to the method, the service life of the catalyst can be effectively prolonged, loss and inactivation of the catalyst are inhibited, and meanwhile, high yield of chlorine and low cost of the process are guaranteed.

The present invention relates to a catalyst for obtaining chlorine (Cl2) through an oxidation reaction of hydrogen chloride (HCl), and more particularly, to an oxidation reaction catalyst for preparing Cl2 from HCl by addition of a second heterogeneous material to a RuO2-supported catalyst using TiO2 as a support, and a preparation method therefor. According to an embodiment of the present invention, a hydrogen chloride oxidation reaction catalyst for use in a method for preparing chlorine by oxidizing hydrogen chloride includes a support and a heterogeneous material in an active ingredient. The catalyst according to the present invention has both increased catalytic activity at a low temperature and enhanced thermal stability, and thus a catalyst having improved durability such as thermal stability at a high temperature is provided. Therefore, since thermal stability is secured, the performance of the catalyst is maintained for a long time even at a high temperature.

This invention relates to a catalytic membrane for HCl oxidation reaction, the preparation method of which includes: Step 1: reacting silica particles with SiO2. ­2 A mixture of ZrO2 sol and silica gel is coated onto a hollow fiber carrier and calcined to obtain a transition layer for the membrane. Step two: A silsesquioxane sol is applied to the transition layer obtained in step one and calcined to obtain a silica membrane. Step three: The silica membrane obtained in step two is subjected to impurity removal treatment. Step four: A solution of silane coupling agent (A) and a metal salt solution (B) are prepared separately and mixed to obtain solution C. The silica membrane treated in step three is immersed in solution C and grafted with nano-metal particles using ultrasonic assistance, followed by a high-temperature reaction to obtain a catalytic membrane. The catalytic membrane designed in this invention, when applied to the HCl oxidation reaction, can separate reactants and products simultaneously, causing the reaction to shift forward, increasing the reaction conversion rate, reducing the reaction temperature, and extending the catalyst lifetime.

The present application relates to the technical field of chemical synthesis, and particularly relates to a preparation method of 4,4'-difluorobenzophenone and a method for synthesizing polyether ether ketone by two steps of carbon tetrachloride. The preparation method of 4,4'-difluorobenzophenone comprises the following steps: under the condition that trifluoromethanesulfonic acid and N-methyl pyrrolidone exist, CCl4 and fluorobenzene are reacted, and the product is hydrolyzed to obtain 4,4'-difluorobenzophenone. The present application solves the problems of high cost, poor environmental protection and performance that cannot meet market requirements of PEEK by innovating raw material route, catalytic system and process parameters, realizes low-cost, green and high-performance synthesis of PEEK, the purity of the prepared DFBP monomer can reach >=99.99%, and the PEEK molecular weight distribution (PDI<=1.9) can be narrowed, and the method is suitable for industrialized production of PEEK materials used in high-end fields such as aerospace, medical devices and electronic and electrical appliances.

The invention belongs to the technical field of industrial waste salt treatment, and particularly relates to a waste concentrated sulfuric acid and salt slag resource utilization method which comprises the following steps: S1, reacting waste concentrated sulfuric acid with concentrated salt slag, and absorbing HCl gas generated by the reaction to prepare hydrochloric acid; s2, acid precipitation; s3, neutralizing the salt solution by using lime slurry, and filtering to remove calcium sulfate precipitate; adding a proper amount of sodium carbonate into the filtrate to remove slightly soluble calcium ions, filtering out precipitates, and then adjusting the pH value of the filtrate back to 4-5 by adopting sulfuric acid; s4, adsorbing organic matters in the filtrate by using activated carbon powder, and filtering to obtain a salt solution to be separated; and S5, separating out potassium sulfate and sodium sulfate in a freezing and heating concentration manner. According to the scheme, the leachate salt residues and the waste concentrated sulfuric acid are subjected to combined treatment, the problem that the simple neutralization treatment efficiency of the concentrated sulfuric acid is too low is solved, the concentrated sulfuric acid is converted into hydrochloric acid capable of being recycled, the waste salt residues are converted into sodium sulfate and potassium sulfate capable of being recycled, resource utilization of waste is achieved, and environmental protection benefits are improved.

The present application relates to a kind of bifluorosulfonylimide lithium separation filtrate resourceization clean processing method, comprising the following steps: step 1, intermediate conversion: lithium hydroxide is added to bifluorosulfonylimide lithium separation filtrate, and reaction generates bifluorosulfonylimide lithium and water, thionyl chloride reacts with the water generated, and is decomposed into sulfur dioxide and hydrogen chloride gas, gas enters waste gas treatment system, and reaction liquid is reserved;Step 2, lithium salt recovery: the reaction liquid of step 1 is filtered, and bifluorosulfonylimide lithium crude product is recovered;Filtrate is reserved;Step 3, solvent fractionation: the filtrate is transferred to solvent fractionation column, at 40~50 ℃ temperature, realize the separation of dichloromethane and thionyl chloride, and recover dichloromethane crude product and thionyl chloride crude product.The present application can realize the recovery and resource utilization of organic solvent and lithium salt, and cost is low, processing efficiency is high, only a small amount of waste gas is produced, almost no waste water and hazardous waste are produced, and the unity of environmental and economic benefits is realized.

The present application relates to the technical field of high-salt wastewater, and particularly relates to a method for resource utilization of potassium-sodium mixed brine. The present application discloses a method for resource utilization of potassium-sodium mixed brine, which comprises the following steps: (1) adding a precipitant to the potassium-sodium mixed brine, performing solid-liquid separation after sufficient stirring and reaction to obtain a post-precipitation liquid and a precipitated solid; (2) adding an oxidant to the post-precipitation liquid to obtain an oxidized liquid after oxidation is completed; (3) separating the oxidized liquid through a separation system to obtain a concentrated liquid and high-concentration brine, and sending the high-concentration brine into an evaporation crystallizer alone for crystallization or sending the high-concentration brine and evaporation mother liquor into the evaporation crystallizer for crystallization. The method disclosed by the present application solves the problem that the potassium-sodium ratio in the concentrated brine is unbalanced and the two kinds of salts cannot be effectively separated in the traditional method.