1637 results about "Water chlorination" patented technology

The invention discloses a high-purity quartz sand reinforced chlorination purification method, and belongs to the technical field of inorganic non-metallic material processing. The method comprises the following steps: putting a quartz sand raw material containing crystal structure impurities into a roasting furnace, and synchronously introducing a gas chlorinating agent and a gas reducing agent into the roasting furnace for roasting to obtain purified quartz sand. According to the method, on the basis of conventional chloridizing roasting purification, a gas reducing agent is introduced to regulate and control the reaction atmosphere, efficient dissociation and chlorination of crystal structure impurities difficult to remove are promoted, and deep efficient purification of quartz sand is achieved. The method has the advantages of simple process equipment, high raw material applicability, high impurity removal efficiency and the like, and can be widely applied to production of 4N5-grade and above high-purity quartz sand.

The invention relates to the technical field of hafnium tetrachloride preparation, in particular to a process method for preparing low-niobium-content hafnium tetrachloride based on a hydrogen reduction method, which comprises the following steps: S1, raw material processing, S2, chlorination and impurity removal, S3, purification, S4, refining and S5, material receiving. According to the method, metal impurities in the hafnium-containing raw stone are removed step by step through the working procedures of raw material processing, chlorination and impurity removal, purification, refining and material receiving, high-purity hafnium tetrachloride with the low niobium content is obtained, in the refining working procedure, under the assistance of the supported catalyst, the metal niobium impurities are removed through a hydrogen reduction method, the removal rate is effectively increased, and the production cost is reduced. And moreover, the process flow is simplified, the energy consumption is reduced, and the method meets the environmental protection requirement.

The invention belongs to the technical field of rare and precious metal recovery, and particularly relates to a method for recovering metallic silver from waste crystalline silicon battery pieces, which comprises the following steps: (1) putting the waste crystalline silicon battery pieces into an inorganic alkali aqueous solution for soaking reaction to obtain an aluminum-containing solution and dealuminized crystalline silicon pieces; (2) adding the dealuminized crystal silicon wafer into a mixed solution of organic acid and hydrogen peroxide for soaking reaction, filtering and washing to respectively obtain silver-containing filtrate and a silver-removed silicon wafer; (3) carrying out chlorination precipitation reaction on the silver-containing filtrate and a chlorine source, filtering and drying to obtain silver chloride powder; (4) adding silver chloride powder into an ammonia water solution, heating and stirring to completely dissolve silver chloride to obtain a silver-ammonia solution; (5) adding PVP (Polyvinyl Pyrrolidone) into the silver-ammonia solution, heating and stirring until the PVP is completely dissolved, adding ascorbic acid, and carrying out reduction reaction at room temperature to obtain metal silver powder precipitate; and filtering, washing and drying the precipitate to obtain the spherical silver powder. According to the method, the silver recovery efficiency is high, the spherical nanoscale silver powder can be prepared, and the purity is high.

The invention provides a method for synergistically recovering all elements of crystal silicon cells of a decommissioned photovoltaic module, which comprises the following steps of: collecting large-particle waste crystal silicon cells and grinding the large-particle waste crystal silicon cells to obtain powder; the powder is leached with nitric acid, and leach liquor and impurity-removed silicon powder are obtained; leaching the silicon powder subjected to impurity removal by using an HF solution to remove a silicon nitride layer, and filtering, washing and drying to obtain the silicon powder meeting the industrial standard; the leaching solution is subjected to chlorination precipitation to obtain silver chloride and a leaching solution with silver removed, and after the silver chloride is filtered, the silver chloride is subjected to acid pickling and water washing to obtain silver chloride; sodium sulfide is added into the leaching solution after silver removal, metal in the leaching solution is precipitated, and a solution containing Al < 3 + > can be obtained after filtering; the method comprises the following steps: adding an alkaline substance into a solution containing Al < 3 + >, filtering to obtain an aluminum hydroxide precipitate, and washing the aluminum hydroxide precipitate to remove foreign ions adsorbed on the surface; one technical effect of the invention is that collaborative recovery and treatment of each element in the waste crystal silicon battery piece are realized.

The invention discloses a sheath material for a saline-alkaline-resistant dragging cable, a preparation method of the sheath material, the cable and the sheath material. The sheath material is prepared from the following raw materials in parts by weight: 40 to 45 parts of chlorinated polyethylene, 1.5 to 2.0 parts of dicumyl peroxide vulcanizing agent, 2 to 2.5 parts of triisocyanate vulcanizing agent, 0.1 to 0.3 part of ethylene thiourea accelerant, 0.05 to 0.15 part of anti-aging agent RD, 4 to 5 parts of metal oxide, 1 to 1.5 parts of paraffin, 8 to 10 parts of calcium carbonate, 15 to 21 parts of reinforcing agent, 1 to 1.5 parts of lead stearate, 0.5 to 1 part of lead sulfate tribasic, 1 to 1.5 parts of ultraviolet light absorber, 3 to 5 parts of epoxidized soybean oil and 8 to 8 parts of chlorinated paraffin. 9 parts of antimony trioxide and 3-4 parts of antimony trioxide. The cable has the advantages of ultraviolet resistance, no salt deposition, water resistance, tensile resistance, cold resistance and the like, can be used for a long time in a special operating environment, has the service life of at least more than 3 years, and avoids frequent replacement of the cable by a user.

According to the preparation method of the low-temperature humified coal gangue-agriculture and forestry solid waste porous slow-release humic acid water-soluble fertilizer, the coal gangue is subjected to magnetic separation and flotation to remove impurities, then the composite chlorinating agent is used for low-temperature chlorination, heavy metal is effectively removed, and meanwhile energy consumption and environmental risks are reduced. Then, under a controlled low-temperature condition, through microwave assistance and specific atmosphere adjustment, a humification reaction is triggered, meanwhile, formation of a porous structure of the material is triggered, and the water solubility and the slow release effect of the fertilizer are enhanced. According to the method, the resource utilization rate of the coal gangue is increased, the high-efficiency soil conditioner is effectively generated through an innovative low-temperature treatment process, and good environmental protection benefits and economic values are achieved. Through the structural design of the obtained fertilizer, the fertilizer can respond to environmental factors, the nutrient release rate is automatically adjusted, and plant absorption and soil health are optimized.

The invention relates to a sludge biochar modified layered bimetallic oxide, and a preparation method and application thereof. The modified layered bimetallic oxide is prepared from the following main raw materials: domestic sewage aeration tank sludge, NaOH, Na2CO3, FeCl3. 6H2O and MnCl2. 4H2O. The domestic sewage aeration tank sludge is used for preparing dry sludge, the ferric chloride solution and the manganese chloride solution are used for preparing sludge composite layered double hydroxides, and the final layered bimetallic oxide composite sludge biochar catalyst can be prepared by calcining the sludge composite layered double hydroxides. The modified layered bimetallic oxide prepared by the scheme of the invention can effectively degrade bisphenol A, has relatively strong reusability, and still keeps good degradation ability in a relatively wide pH environment.

The invention relates to the technical field of chemical tail gas treatment, and discloses a multi-stage series chlorinated tail gas efficient absorption system and method.The multi-stage series chlorinated tail gas efficient absorption system comprises a multi-stage series absorption unit, a circulation control system, a tail gas collection device, an emission monitoring device, a safety protection system, a tail gas purification device and an automatic control system; the multi-stage series absorption unit comprises a first-stage turbulence absorption tower, a second-stage membrane contact tower and a third-stage deep washing tower, and the multi-stage series absorption unit, a circulation control system, a tail gas collection device, an emission monitoring device, a safety protection system, a tail gas purification device and an automatic control system are integrated; according to the invention, high-efficiency, automatic and intelligent treatment of chlorinated tail gas is realized, the tail gas can be subjected to multi-stage treatment through the design of the multi-stage series absorption unit, and different pollutants can be efficiently removed in each stage, so that the treatment efficiency of the tail gas is greatly improved.

The invention relates to the technical field of quartz sand purification, in particular to a high-purity quartz sand purification method and equipment. 2, a magnetic separation stage; 3, an acid leaching stage; 4, an ultrasonic-assisted cleaning stage; 5, a high-temperature chlorination treatment stage; according to the quartz sand purification method, various impurities such as magnetic impurities, non-magnetic metal impurities and silicate impurities in the quartz sand can be deeply removed through the synergistic effect of multiple steps such as pretreatment, magnetic separation, acid leaching, ultrasonic-assisted cleaning and high-temperature chlorination treatment, the purity of the quartz sand reaches 99.999% or above, the strict requirements of high-end fields such as semiconductors and photovoltaics are met, and the method is suitable for industrial production. The purification steps are closely linked to form a modular purification process, and meanwhile, advanced technologies such as ultrasonic-assisted cleaning and high-temperature chlorination treatment are adopted, so that the impurity removal efficiency is remarkably improved, the purification time is shortened, and the energy consumption and the use amount of chemical reagents are reduced by optimizing the process and equipment.

The invention belongs to the technical field of resource regeneration, and particularly relates to a method for recycling hydrochloric acid and germanium through direct two-stage distillation after germanium chlorination distillation, which comprises germanium chlorination distillation, first-stage positive pressure acid steaming, second-stage negative pressure acid steaming and kettle stopping and slag liquid discharging. According to the invention, two-stage acid distillation is directly carried out in the original production equipment system after germanium chlorination distillation, so that the innovation of integrated continuous production of germanium chlorination distillation and acid distillation in the same equipment system is realized, the process is more energy-saving and economic, the operation is simpler and more convenient, the equipment utilization rate is higher, and the environment is more friendly; the recycling rate of hydrochloric acid is up to 60% or above; a one-stage positive-pressure acid steaming process is adopted, high-concentration hydrochloric acid with the HCl molar concentration larger than or equal to 9.5 mol / L is regenerated and can be directly returned to germanium chlorination distillation for use, and synchronous limit recovery of residual germanium in germanium chlorination distillation residues is achieved; therefore, full recycling of hydrochloric acid and germanium in germanium chlorination distillation waste acid and waste residues is realized.

The invention provides a titanium tetrachloride boiling chlorination process optimization method based on a causal model and electronic equipment, and the method comprises the steps: constructing a generation mechanism between structural equation model expression variables based on the causal relationship between boiling chlorination key process parameters and result variables; the effect of external intervention on the TiCl4 yield and unit cost is simulated through causal inference, and a multi-target optimization model with the minimization of the unit product manufacturing cost and the maximization of the TiCl4 yield as targets is constructed in combination with the structural model and Monte Carlo sampling estimation expectation; and iteratively solving the optimization model by adopting a causal-based non-dominated sorting genetic algorithm, and obtaining a Pareto optimal solution set meeting variable constraint conditions through operations such as causal variable classification, dynamic penalty weighting, non-dominated sorting and sensitive driving disturbance. According to the method, a causal modeling and optimization integrated framework suitable for the boiling chlorination process is constructed, personalized process strategy generation and production operation decision making are supported, and the raw material utilization rate and the process operation economy are improved.

The invention relates to the technical field of organic synthesis, and discloses a preparation process of (S)-3-aminobutyronitrile hydrochloride, which comprises the following steps: by taking a compound S1 as an initial raw material, sequentially implementing chlorination, amino protection, cyano substitution and deprotection reaction through four-step continuous reaction (M01 preparation, M02 preparation, M03 preparation and M04 preparation), and finally obtaining the high-purity (S)-3-aminobutyronitrile hydrochloride. The preparation process disclosed by the invention is simple and convenient to operate, mild in reaction condition, stable in yield of each step, high in safety and suitable for industrial large-scale production, and can be used for carrying out standard treatment on the cyanide-containing wastewater, and has a relatively good application prospect.

Metal recovery and separation systems and methods, more particularly electrothermal chlorination (ETC) and electrothermal carbochlorination (ETCC) methods and systems for selective metal extraction, such as extraction of key metals from waste streams. Alternatively, other oxidizing agents, such as fluorine, bromine or iodine, may be used in place of or in combination with chlorine. Further, or other reducing agents, such as a metal (0), such as tin (0), and H2 (H2 included in argon, such as 1% to 5% by volume of H2 in argon, may be used in place of or in combination with carbon. Embodiments of the invention may utilize ETC to selectively recover In from ITO-containing waste, and utilize ETC in combination with ETCC to recover Ta from capacitor waste.

The invention discloses a method for preparing superfine high-purity germanium dioxide from germanium tetrachloride. The method comprises the following steps: step 1, preparing a reactor; step 2, preparing hydrolysis mother liquor; step 3, hydrolysis; step 4, suction filtration and washing; step 5, drying; and step 6, screening. According to the method for preparing the superfine high-purity germanium dioxide, the production efficiency of the superfine high-purity germanium dioxide can be effectively improved, and the superfine high-purity germanium dioxide is efficiently prepared by controlling the hydrolysis ratio, the acidity of hydrolysate, the germanium content, the temperature of the whole hydrolysis process, the hydrolysis rate and the stirring power.

The invention relates to the field of fine chemical engineering, and discloses a green process for preparing chloramine T by a continuous flow reactor. The method comprises the following steps: respectively pumping p-toluenesulfonamide, a sodium hydroxide solution and a sodium hypochlorite solution into a micro-channel mixer for instantaneous mixing, and carrying out chlorination reaction in a multi-stage temperature control tubular reaction unit; the concentration of free chlorine is detected on line at an outlet, and the flow rate of a chlorine source is dynamically adjusted through a PID algorithm, so that closed-loop control is realized; the reaction liquid is directly crystallized and separated to obtain the product without alkali wash. The system comprises a base solution and chlorine source conveying subsystem, a micro-channel mixer, a multi-stage reaction unit, an online monitoring module, a central controller and a crystallization unit. The side reaction is inhibited from the source, so that the free chlorine is less than or equal to 0.5 mg / L, the alkali washing step is omitted, the COD (Chemical Oxygen Demand) of the wastewater is reduced by more than 80%, the product purity is more than or equal to 99.5%, and the productivity is improved by 3 times.

The invention provides a method for recovering Si, C and TiO2 based on chlorinated waste salt water quenching slag, which comprises the following steps: sequentially carrying out water quenching dissolution, precipitation separation and filter pressing dehydration treatment on chlorinated waste salt to obtain water quenching slag and supernate; adding a dilute acid solution into the water-quenched slag, dissolving, and adding a reducing agent for reaction to obtain slurry; carrying out solid-liquid separation on the slurry to obtain a solid material and filtrate; the filtrate is pumped into a boiling bed separator, the petroleum coke and TiO2 are intercepted by a medium material layer, clear liquid is discharged, then the medium material layer is subjected to backwashing regeneration, and the desorbed petroleum coke and TiO2 are subjected to graded enrichment by a hydrocyclone, so that petroleum coke slurry and TiO2 slurry are obtained. According to the method, TiO2, C and other resources in the water-quenched slag obtained after molten salt chlorination waste salt water quenching are recycled, and the technical problem that in the existing chlorination waste salt resourceful treatment process, Si, C, TiO2 and other resources in the water-quenched slag are wasted is solved.

The present invention relates to a process for producing molybdenum dioxide dichloride, which is a very efficient process that does not use hazardous chlorine gas and high reaction temperatures and enables the production of molybdenum dioxide dichloride in high yield without solvent.

Disclosed herein are methods and systems for the recovery of uranium from used fuel salts using nonaqueous chemistry without electrometallurgy techniques. The used fuel salts are maintained in a molten state in a chlorination chamber, and are then chlorinated for a period of time sufficient to convert at least some UCl3 into a different uranium chloride, thereby generating a uranium-containing gas phase. The uranium-containing gas phase is separated from the resulting residue, and is condensed for collection.

The invention relates to the technical field of supervision and control, in particular to a polyethylene chlorination reaction control system which comprises a hot-pressing time difference extraction module, a viscosity variable-speed recognition module, a chlorine pressure collaborative trend division module, a response centralized recombination module and a stirring amplitude management and control module. According to the method, a multi-source variable data structure is unified through period numbers, cooperative sections with consistent trend directions are constructed, response feature fragments in a continuous period are recognized by combining fluctuation frequency and adjustment amplitude feature extraction, the behavior boundary of each variable in the time dimension is unified, and the recognition precision of multi-variable abnormal evolution is improved; a regulation and control reference is established through trend classification and strength grading, structured expression and controllability analysis of periodic behaviors are realized, the matching between the regulation rhythm and the variable trend is enhanced, and a regulation and control strategy is enabled to have clear boundary recognition, period tracking and behavior intervention capabilities.

The invention discloses an anti-corrosion composite furnace lining material for zircon sand fluidizing chlorination and a preparation method thereof.The anti-corrosion composite furnace lining material comprises a base body layer and an anti-chlorine-seepage protection layer, and the preparation method comprises the steps of base body layer preparation, coating liquid preparation, base body layer surface coating, coating curing, high-temperature firing, chlorine seepage treatment and annealing. According to the method, the specially-made coating liquid is adopted for enhancing the surface of the high-purity corundum furnace lining for the first time, the permeability of the coating liquid to a base body layer is improved by means of matched dissolution-sedimentation of chromium chloride and phosphoric acid, pores are blocked by means of expansion caused by dehydration and oxidation of CrCl3. 6H2O, densification of surface layer Cr2O3, spinel and phosphate and surface layer pore blocking are achieved, the porosity is greatly reduced, and the porosity of the high-purity corundum furnace lining is improved. The chlorine permeability is reduced, and the core problems of high permeability and short service life of the material in a high-temperature chlorine corrosion environment are solved; according to the invention, a chlorination-annealing self-cleaning process is matched to realize deep removal of impurities, so that the product purity of the chlorination process is improved, and the purification cost is reduced.

The invention belongs to the technical field of wastewater treatment, and particularly relates to wastewater treatment equipment based on rare earth chloride production, which comprises a treatment cylinder, a bracket I is mounted on the periphery of the treatment cylinder, a treatment device is mounted in the treatment cylinder, a water inlet pipe is mounted and communicated above the treatment cylinder, and a draw-off pump II and a flowmeter I are mounted on the water inlet pipe; a water outlet pipe is mounted and communicated below the treatment barrel, a water pump is mounted on the water outlet pipe, a through hole I is formed above the treatment barrel, a cleaning device is mounted in the treatment barrel, a lifting moving device is mounted above the through hole I, the lifting moving device is detachably connected with the cleaning device, and an aeration device is mounted in the treatment device; compared with the prior art, the aeration device has the advantages that the oxidation effect on harmful substances such as organic matters in wastewater is enhanced, when the rotating cylinder eccentrically rotates in the screening cylinder, the wastewater can be stirred, floc is promoted to be fully collided and gathered, and the forming efficiency and quality of the floc are improved.

The invention discloses a phosphorus trifluoride production device and method, and belongs to the technical field of phosphorus trifluoride production, the device comprises a reaction part, a pretreatment part and a post-treatment part, the reaction part comprises a first raw material tank, a second raw material tank, a reaction kettle and a collection cold trap, the pretreatment part comprises a primary separation tower and an absorption tower, and the post-treatment part comprises a secondary separation tower and an absorption tower. The post-treatment part comprises an adsorption tower, a light component removal tower and a heavy component removal tower; the production method comprises the following steps: adding raw materials of phosphorus trichloride and hydrogen fluoride into a reaction kettle to generate phosphorus trifluoride and hydrogen chloride, collecting the phosphorus trifluoride and hydrogen chloride in a collecting cold trap, heating the collecting cold trap to vaporize the phosphorus trifluoride and hydrogen chloride, and sequentially entering a primary separation tower, a light component removal tower and a heavy component removal tower for a series of treatment, and finally, high-purity phosphorus trifluoride gas is extracted from the heavy component removal tower to a filling system. According to the method, high-purity phosphorus trifluoride with the purity larger than or equal to 99.999% can be finally produced, and the problem that in the prior art, the purity of phosphorus trifluoride is not enough is solved.

The invention provides a polyurethane material for leaking stoppage of a coal mine and a preparation method of the polyurethane material, and belongs to the technical field of polyurethane. The preparation method comprises the following steps: preparing melamine formaldehyde resin balls and ZnAl-LDHs, mixing and reacting the melamine formaldehyde resin balls and the ZnAl-LDHs to prepare LDH-MF composite balls, dipping in an iron salt solution, calcining to prepare composite balls, chloridizing with thionyl chloride, reacting with an ionic liquid and hyperbranched polyester to prepare IL / G composite balls, mixing with polyether polyol and a catalyst, adding into water, adding a foaming agent and silicone oil, heating, stirring and mixing, transferring into a mold, and carrying out extrusion molding to obtain a finished product. And adding diisocyanate, foaming, cooling to room temperature, drying and curing to obtain the polyurethane material for leaking stoppage of the coal mine. The prepared polyurethane material for leaking stoppage of the coal mine has good mechanical property, high temperature resistance and antibacterial property, good flexibility, good antistatic property and obviously improved flame retardance, and has a wide application prospect.

The invention discloses a method for reducing the content of rare earth carbonate oil, which comprises the following steps: adding rare earth carbonate seed crystals and pure water into a precipitation tank, feeding a rare earth chloride solution after extraction separation into the precipitation tank, adding an ammonium bicarbonate solution, and carrying out precipitation reaction to obtain rare earth carbonate; the method comprises the following steps: treating rare earth carbonate with hydrochloric acid, converting into a rare earth chloride solution, and filtering the rare earth chloride solution to remove oil to obtain a refined rare earth chloride solution; adding rare earth carbonate into a precipitation tank as a seed crystal, adding the refined rare earth chloride solution and the prepared ammonium bicarbonate solution into the precipitation tank, and carrying out precipitation reaction to produce oil-free rare earth carbonate. According to the invention, oil entrained in the extraction feed liquid and oil dissolved in the feed liquid can be removed, and the quality of the rare earth carbonate product is improved.

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 provides a method for recycling valuable metal from germanium-antimony-tellurium alloy waste. The method comprises the three steps of surface treatment, chlorine reaction and compartment condensation and discharging. Oxidation films on the surfaces of the waste materials are removed through surface treatment, and the subsequent chlorine reaction efficiency is improved; then a self-made chlorination-step condensation integrated device is utilized, germanium, antimony and tellurium react with chlorine at the high temperature to generate gaseous chloride, step-by-step condensation separation is achieved through partition temperature control based on the boiling point difference of tellurium tetrachloride, antimony pentachloride and germanium tetrachloride, and target products are collected respectively; and finally, introducing inert gas to purge residual chlorine, and discharging safely. The method has the advantages of short process flow, no need of complex wet process steps and low equipment investment; metal chlorides are efficiently separated through the integrated device, and recovery is thorough; and the pyrogenic process is mainly adopted, no wastewater is generated, only tail gas is treated in a compliance manner, and the method is environment-friendly. Compared with a traditional wet process, the method has the remarkable advantages of high efficiency, low cost, environment friendliness and the like.

This invention discloses a method for preparing high-purity zirconium oxide, belonging to the field of compound preparation technology. The method provides a breakthrough adjustment of the final concentration state and the cooling process after concentration and evaporation of an acidic zirconium oxychloride solution under the action of an oxidant. Simultaneously, crystallization is achieved through a two-stage concentration and evaporation process, followed by calcination to obtain hafnium-free zirconium oxide. The resulting zirconium oxide not only has a high yield but also high purity. Furthermore, the technical solution of this invention avoids the generation of ammonia nitrogen wastewater as in existing technologies, thus not only avoiding environmental impact but also significantly reducing production costs through the recycling of hydrochloric acid condensation, achieving a green and environmentally friendly effect.

The invention discloses a comprehensive treatment method of platinum and palladium slag, and relates to the technical field of non-ferrous metal metallurgy. After the platinum and palladium slag is subjected to sulfating roasting, flue gas is introduced into a selenium absorption tower; hydrolyzing the roasting slag, reducing the dissolving solution to recover tellurium, and enabling the dissolving solution to enter a copper recovery process after tellurium precipitation; the dissolving slag is subjected to chlorination dissolution gold separation, and the gold separation slag is subjected to silver recovery; the gold separation liquid is reduced to obtain gold powder; carrying out platinum and palladium precipitation on the gold reduced solution, adding ammonia water into platinum and palladium precipitation to carry out platinum and palladium separation, respectively refining the separated platinum and palladium, and recovering platinum and palladium; carrying out platinum-palladium reduction on the platinum-palladium precipitation post-solution to obtain platinum-palladium precipitation slag and a platinum-palladium reduction post-solution, and returning the platinum-palladium precipitation slag to the roasting process; and performing tellurium reduction on the platinum-palladium reduced liquid to obtain tellurium powder and tellurium reduced liquid, and enabling the tellurium reduced liquid to enter a wastewater treatment process. The method has the beneficial effects that selenium, tellurium, copper, gold, silver, platinum and palladium are separated and recycled step by step, the recycling rate is high, the wastewater treatment difficulty is small, and environmental pollution is reduced.

The invention relates to equipment for synthesizing chlorinated polyvinyl chloride and a synthesis method thereof, and belongs to the technical field of chemical synthesis equipment. Through the synergistic effect of the cavitation effect of ultrasonic waves and the photocatalytic reaction, the ultrasonic waves generate a large number of tiny bubbles in the working solution, on one hand, the tiny bubbles just enable pvc particles with lower density to float and overflow, and photocatalyst particles with higher density are kept at the bottom, so that self-separation of reactants and a catalyst is achieved, and the self-separation effect of the reactants and the photocatalyst is improved. On the other hand, the microbubbles quickly collapse in an extremely short time after floating to the surface of the reaction liquid, a cavitation effect is generated, dispersion of the photocatalyst in the reaction stock solution can be promoted, and the contact opportunity of the photocatalyst and reactants in the reaction stock solution is increased. A local high-temperature and high-pressure environment generated when the microbubbles are broken can enhance the activity of the photocatalytic reaction, and the synergistic effect of the microbubbles and photocatalysis can accelerate the photocatalytic reaction rate, promote the chlorination reaction of chlorine and pvc particles, and improve the chlorination rate.

The invention discloses a tubular reactor and a high-temperature chlorination treatment device.The tubular reactor comprises a rotatable first tube body, a gas supply assembly, a material supply assembly and a heating assembly, the feeding end of the first tube body is higher than the discharging end, and the first tube body is provided with at least two reaction areas; each reaction area extends from the feeding end of the first pipe body to the discharging end of the first pipe body; the gas supply assembly is configured to supply chlorinated gas to each reaction area; the feeding assembly is configured to provide quartz sand raw materials for each reaction area; the heating assembly is configured to heat all the reaction areas; when the first pipe body rotates, the quartz sand raw materials in each reaction area roll in the respective reaction area, so that the quartz sand raw materials in each reaction area are in full contact with the chlorinated gas. The tube reactor can greatly increase the use volume of the tube body and improve the purification efficiency; and moreover, the mixing uniformity of the quartz sand raw material and the chlorinated gas can be improved, and the dosage of the chlorinated gas is greatly reduced.