28results about "Arsenic oxides/hydroxides/oxyacids" patented technology

The invention discloses a closed cycle utilization method of a zirconium-based arsenic removal agent. The method comprises the following steps: (1) taking zirconium sulfate as the arsenic removal agent used for the first time; the roasted material prepared in the step (4) is adopted as an arsenic removal agent for follow-up recycling; adding an arsenic removal agent into the arsenic-containing acid liquid and / or zirconium arsenate thin slurry, and carrying out solid-liquid separation to obtain arsenic-removed slag and arsenic-removed liquid; (2) mixing the arsenic-removed liquid with macroporous composite exchange resin, and carrying out zirconium removal reaction to obtain zirconium-loaded resin and purified liquid; (3) mixing the zirconium-loaded resin with the arsenic-containing acid solution, and separating resin particles from the slurry containing the zirconium arsenate precipitate by using a solid-liquid separation device to obtain regenerated resin and zirconium arsenate thin slurry; (4) mixing the arsenic-removed slag with a sulfuric acid solution and elemental sulfur, carrying out a reduction roasting reaction to obtain a roasted material, and condensing gas released by the reaction to obtain a mixture of sulfuric acid and arsenious acid; and (5) cooling the mixture of sulfuric acid and arsenious acid, and carrying out centrifugal separation to obtain arsenic trioxide solid and a sulfuric acid solution.

The application discloses a cooling crystallization device for arsenic leaching solution, which comprises a cooling crystallization tank with a corresponding heat exchange jacket arranged on the periphery, a stirring mechanism comprising a hollow rotating shaft, the middle part of the hollow rotating shaft is connected with corresponding arc-shaped stirring plates through a plurality of material collecting pipes, a crystallization material discharging mechanism comprising a discharging one-way valve installed at the bottom of the hollow rotating shaft, a corresponding blocking push plate is installed in the hollow rotating shaft on the upper side of the material collecting pipe and can be lifted, the blocking push plate is rotationally connected to the end of the piston rod of a corresponding lifting drive oil cylinder through a corresponding connecting shaft, at least one liquid discharging one-way valve for discharging liquid material is installed on the blocking push plate, a corresponding filter screen plate is fixedly connected to the bottom side of the liquid discharging one-way valve, and the opening pressure of the liquid discharging one-way valve is smaller than that of the discharging one-way valve. The application can effectively separate the solid and liquid of part of the crystallized material, and can timely output the crystallization material after the solid-liquid separation.

The application discloses a kind of high-efficiency energy-saving sulphidized arsenic residue cleaning treatment process, comprising the following steps: (1) the sulphidized arsenic residue containing free acid is slurried with calculated amount 3~6 times of reducing agent, the pH value of slurry is adjusted to 6.5 with adjusting agent, and dry material is obtained by filtering and drying;(2) adding skeleton material to dry material, and making hollow brick by brick making machine after mixing evenly;(3) the hollow brick is transferred into furnace to carry out drying, reduction, sublimation and cooling in turn to complete the process of arsenic removal, and obtain arsenic removal residue and arsenic-containing high-temperature flue gas;(4) after heat exchange and cooling by heat exchanger, the arsenic-containing high-temperature flue gas enters condensing chamber to condense and recover arsenic to obtain arsenic trioxide;(5) after flue gas purification and water-gas separation, the arsenic removal tail gas returns to use.The application uses the above treatment process, basically no external heating is needed during continuous production, the purity of arsenic trioxide recovered by condensation is relatively high, the arsenic removal tail gas is recycled after nitrogen purification, basically no external discharge or very small discharge amount, and it is environment-friendly.

Method for producing a surface-treated gallium arsenide substrate, comprising the following steps: a) Providing a gallium arsenide substrate; b) Oxidation treatment of at least one surface of the gallium arsenide substrate in the dry state using UV radiation and / or ozone gas; c) Contacting at least one surface of the gallium arsenide substrate with at least one liquid medium; comprising the following sub-steps: ci) Contacting at least one surface of the gallium arsenide substrate with alkaline aqueous solution, c-ii) subsequent contact of at least one surface of the gallium arsenide substrate with water, c-iii) subsequent contact of at least one surface of the gallium arsenide substrate with acidic aqueous solution, c-iv) subsequent further contact of at least one surface of the gallium arsenide substrate with water. d) Marangoni drying of the gallium arsenide substrate.

The invention belongs to the technical field of metal smelting, and particularly relates to a method for preparing arsenic through a wet method by using copper-containing reduction source liquefied slurry, which specifically comprises the following steps: mixing copper-containing reduction source liquid and an arsenic filter cake according to a certain proportion, and continuously stirring for a certain time at a certain speed to obtain copper-arsenic slurry; the obtained copper-arsenic slurry is heated and preheated to a certain temperature for oxygen pressure leaching, and leached slurry is obtained; and cooling the obtained slurry, and filtering to obtain arsenic trioxide and filtrate. According to the method, the arsenic content in the slag phase can be effectively reduced, the direct recovery rate of the arsenic is increased, the liquefied slurry is reduced through the low trivalent arsenic concentration, and the leaching rate of the leached trivalent arsenic is increased.

The invention discloses a cooling and crystallizing device for arsenic leachate, which comprises a cooling and crystallizing tank with a corresponding heat exchange jacket on the periphery; the stirring mechanism comprises a hollow rotating shaft, and the middle of the hollow rotating shaft is outwards connected with corresponding arc-shaped stirring plates through a plurality of material collecting pipes; the crystal substance discharging mechanism comprises a discharging one-way valve installed at the bottom of the hollow rotating shaft, a corresponding blocking and pushing plate is installed in the hollow rotating shaft on the upper side of the material collecting pipe in a liftable mode, and the blocking and pushing plate is rotationally connected to the piston rod end of a corresponding lifting driving oil cylinder through a corresponding connecting shaft; at least one liquid removal one-way valve for discharging the liquid material is mounted on the baffle push plate, the bottom side of the liquid removal one-way valve is fixedly connected with a corresponding filter screen plate, and the opening pressure of the liquid removal one-way valve is smaller than that of the discharging one-way valve. According to the solid-liquid separation device, solid-liquid separation can be effectively carried out on part of crystallized materials, and crystals obtained after solid-liquid separation of the part of crystallized materials can be output in time.

The invention belongs to the technical field of metallurgy, and discloses a purification method of arsenic trioxide. The purification method comprises the following steps: S1, mixing crude arsenic trioxide with nitrate, and heating at 250-350 DEG C to react for 2-4 hours; s2, heating the reaction system obtained in the step S1 to 550-650 DEG C, and maintaining for 3-6 hours to sublimate arsenic trioxide so as to obtain roasting slag and arsenic-rich flue gas; and S3, recycling arsenic trioxide from the arsenic-rich flue gas obtained in the step S2. Nitrate is used as an antimony removal agent, and the problem that arsenic and antimony are similar in physicochemical property and difficult to separate is solved. According to the method, the characteristic of strong oxidizing property of nitrate is utilized, efficient recovery of arsenic trioxide is achieved at the low temperature, the obtained arsenic trioxide is high in purity, and the recovery rate of arsenic and antimony is high.

The application discloses a preparation equipment and a preparation method of diarsenic trioxide, and the preparation equipment of the diarsenic trioxide comprises a filter press and a cooling crystallization device, the filter press comprises a rack, a plurality of filter plates are movably arranged on the rack in a transverse direction, a pressing mechanism is arranged on the rack and is used for pushing and pressing the plurality of filter plates, a multifunctional filter pressing mechanism comprises a boost air inlet assembly used for pushing the filter cloth of the filter plate outward, a plurality of pushing blocks are fixedly arranged on the filter cloth, and a vibrating block is movably arranged between two adjacent pushing blocks; and the cooling crystallization device comprises a cooling crystallization tank, a feeding pipe is arranged on the upper end of the cooling crystallization tank and is connected with a discharging pipe of the filter press, and a stirring mechanism is arranged on the cooling crystallization tank and is used for mixing and stirring materials in the cooling crystallization tank. The application can effectively assist in improving the overall solid-liquid separation rate of arsenic filter cake slurry, and can facilitate pumping of arsenic leaching solution after crystallization and effectively reduce the solid-liquid separation operation amount of subsequent products.

The application belongs to the technical field of metallurgy, and discloses a purification method of diarsenic trioxide. The purification method comprises the following steps: S1. heating and reacting the crude diarsenic trioxide mixed with nitrate at 250-350 DEG C for 2-4 h; S2. raising the reaction system obtained in step S1 to 550-650 DEG C and maintaining for 3-6 h to sublimate the diarsenic trioxide, so as to obtain roasting slag and arsenic-rich flue gas; and S3. recovering diarsenic trioxide from the arsenic-rich flue gas obtained in step S2. The application uses nitrate as an antimony removal agent, and solves the problem that arsenic and antimony are difficult to separate due to similar physical and chemical properties. The application utilizes the strong oxidizing property of nitrate, and realizes efficient recovery of diarsenic trioxide at a low temperature. The obtained diarsenic trioxide has high purity, and the recovery rates of arsenic and antimony are high.

The invention belongs to the technical field of non-ferrous metal hydrometallurgy, and particularly relates to a method for synergistically recovering copper and arsenic through an arsenic filter cake and copper electrolysis waste liquid. According to the method, the arsenic filter cake is added into the copper electrolysis waste liquid, oxidation leaching of arsenic trisulfide in the arsenic filter cake is promoted through the oxidability of arsenic (V) in the copper electrolysis waste liquid, and the leaching rate of arsenic is increased; meanwhile, the sulfur element in the arsenic filter cake is used for promoting copper precipitation in the copper electrolysis waste liquid, and the recovery rate of copper is increased. The method has the advantages that the method is low in cost, short in process, simple and convenient, chemical reagents do not need to be additionally added, the leaching rate of arsenic in the arsenic filter cake reaches 90% or above, and the recovery rate of copper in the copper electrolysis waste liquid reaches 75% or above; in addition, copper sulfide slag with the copper content larger than 30% is obtained and can be directly returned to a smelting system for copper smelting, a solution with the arsenic content larger than 60 g / L is obtained, and a proper raw material is provided for follow-up reduction and recovery of arsenic trioxide.

The invention relates to a regeneration method of a waste denitration catalyst, which comprises the following steps: mixing the waste denitration catalyst with a first treatment solution for reaction to dissolve out arsenic element in the waste denitration catalyst to obtain an arsenic-containing treatment solution and an arsenic-removed catalyst; the arsenic-containing treatment liquid reacts with a first alkaline substance, so that the arsenic element and the iron element in the arsenic-containing treatment liquid are converted into precipitates; reacting the precipitate with a second alkaline substance to dissolve the precipitate containing the arsenic element so as to obtain a solution containing ammonium meta arsenite; and heating and decomposing the solution containing the ammonium meta arsenite to obtain arsenic trioxide. According to the regeneration method of the waste denitration catalyst in one embodiment, efficient leaching of harmful component arsenic oxide and low leaching of active components can be achieved, selective dissolution of arsenic is achieved, and therefore efficient regeneration of the arsenic-containing waste denitration catalyst is achieved.

This invention relates to a method for the co-treatment and recovery of valuable elements from high-arsenic alkaline wastewater and arsenic sulfide slag, comprising the following steps: placing the high-arsenic alkaline wastewater in a reaction tank, slowly adding arsenic sulfide slag and a small amount of oxalic acid to the high-arsenic alkaline wastewater to obtain sulfur slag and arsenic-rich wastewater; placing the arsenic-rich wastewater from step 1 in a reaction tank, and then adding oxalic acid to the reaction tank to obtain arsenic trioxide and low-arsenic wastewater; placing the low-arsenic wastewater obtained in step 2 in a reaction tank, and then adding a sulfiding agent to the reaction tank to obtain arsenic sulfide slag and arsenic-removed wastewater; neutralizing the arsenic-removed wastewater with lime to obtain gypsum and reclaimed water. This invention, by co-treating high-arsenic alkaline wastewater and arsenic sulfide slag, can achieve the goal of "using waste to treat waste and turning waste into treasure," and has advantages such as low investment in treatment equipment, reasonable treatment process, high treatment efficiency, and low treatment cost. It has profound significance for improving the economic benefits of enterprises and pursuing a green and sustainable development path.

The invention provides a process for comprehensively recovering valuable metals from tin-containing soot, which comprises the following steps: taking the tin-containing soot, carrying out first-stage high-pressure oxygen leaching to obtain a first-stage leaching solution and first-stage leaching residues, and recovering lead, bismuth and tin valuable metals from the first-stage leaching residues; the tin-containing soot and the first-section leachate are subjected to second-section high-pressure oxygen leaching, second-section leachate and second-section leaching residues are obtained, and the second-section leaching residues are returned to the first-section high-pressure oxygen leaching; copper recovery is conducted on the second-section leaching solution, and copper deposition post-solution and copper sulfide slag are obtained; the copper sulphide slag is subjected to alkali washing to obtain alkali washing liquid and copper sulphide; reacting the copper-deposited solution with sulfur dioxide, and then reacting with hydrogen sulfide to obtain an arsenic-deposited solution and arsenic sulfide slag; and the arsenic sulfide slag is subjected to copper replacement and arsenic replacement, and arsenic trioxide and copper sulfide are recycled. According to the method, valuable metals such as arsenic, copper, bismuth and tin in the tin-containing soot are separated and comprehensively recycled one by one, the recycling efficiency is high, the cost is low, the hazardous waste tin-containing soot is effectively treated, meanwhile, the wastewater yield is small, almost no waste residue is generated, and secondary pollution to the environment is avoided.

The invention belongs to the technical field of non-ferrous metal metallurgy, and discloses a method for purifying arsenic trioxide and separating antimony by a two-step method, which comprises the following steps: adding coarse arsenic trioxide into a first-section purification furnace, and carrying out high-temperature sublimation volatilization on the arsenic trioxide to form a first-section arsenic-containing flue gas so as to separate the arsenic-containing flue gas from other impurities; the first-section arsenic-containing flue gas enters a first-section gravity settling chamber and is slowly cooled and settled to obtain an arsenic trioxide product, and the flue gas discharged from the first-section gravity settling chamber passes through a first-section bag collector to obtain high-antimony arsenic trioxide and tail gas; high-antimony arsenic trioxide is added into a second-section purification furnace, arsenic trioxide is sublimated at a high temperature to form second-section arsenic-containing flue gas, separation of the second-section arsenic-containing flue gas and antimony is achieved, and antimony is enriched into slag to form antimony slag; and the second-stage arsenic-containing flue gas enters a second-stage gravity settling chamber, and is slowly cooled and settled to obtain an arsenic trioxide product. According to the method, a two-step method is adopted, especially through a selective volatilization technology, the antimony material is separated from As2O3, antimony is enriched into slag, and the loss of valuable metal is reduced.

The invention relates to the technical field of resourceful treatment of colored metal metallurgy solid hazardous wastes, in particular to a resourceful treatment method of high-arsenic smoke dust. The resourceful treatment method of the high-arsenic smoke dust comprises the following steps: mixing the high-arsenic smoke dust with an acid solution, carrying out leaching reaction to obtain filtrate and filter residues, and recovering compounds of metal elements of lead, arsenic, copper, cadmium, bismuth, antimony, indium, zinc and silver through a precipitator reaction under the condition that the pH value is-3.0-7.0. According to the method, various elements such as lead, arsenic, copper, cadmium, bismuth, antimony, indium, zinc and silver in the high-arsenic smoke dust are classified and recycled, the recycled products are various in variety and high in additional value, the purpose of comprehensive utilization of resources is truly achieved, the problem that the high-arsenic smoke dust is difficult to treat is solved, and pollution to the environment is reduced.

A gallium arsenide substrate which exhibits at least one surface having a surface oxide layer comprising gallium and arsenic oxides and which exhibits at least one surface having, according to an ellipsometric lateral substrate mapping with an optical surface analyzer, based on a substrate diameter of 150 mm as reference, a defect number of <6000 and / or a total defect area of less than 2 cm2, wherein a defect is defined as a continuous area of greater than 1000 μm2 having a deviation from the average measurement signal in elipsometric lateral substrate mapping with an optical surface analyzer of at least ±0.05%.

The invention belongs to the field of metallurgical technology, and specifically relates to a method for synergistically recovering valuable elements from high-arsenic alkaline wastewater and black copper mud, comprising the following steps: S1. adding black copper mud to high-arsenic alkaline wastewater, and after reaction, solid-liquid separation to obtain arsenic-rich liquid and copper slag; S2. adding sulfuric acid to the arsenic-rich liquid obtained in step S1, and after reaction, obtaining arsenic trioxide slag and low-arsenic wastewater; S3. evaporating and concentrating the low-arsenic wastewater obtained in step S2 to obtain sodium sulfate and evaporation mother liquor. The invention combines the chemical properties of high-arsenic alkaline wastewater and black copper mud, and jointly treats the two to recover valuable elements such as arsenic and copper, thereby reducing the production cost of separately treating high-arsenic alkaline wastewater and black copper mud, achieving the purpose of "using waste to treat waste and turning waste into treasure", avoiding the problem of heavy metal pollution in the reuse process, and having the advantages of short process flow, high metal recovery rate, low treatment cost, etc.

The invention discloses a resource recycling method for arsenic in wastewater, and belongs to the technical field of wastewater treatment and resource recycling. The resource recycling method for arsenic in wastewater comprises the following steps: preparing a mixed solution of sodium iodide, sodium sulfite and sodium carbonate, and adding the mixed solution into arsenic-containing wastewater to be treated; the method comprises the following steps: introducing nitrogen into arsenic-containing wastewater to be treated containing sodium iodide, sodium sulfite and sodium carbonate, stirring and carrying out light treatment, reacting to obtain an arsenic-containing solid, and sequentially centrifuging and freeze-drying to recycle the arsenic-containing solid. According to the method, arsenate in the wastewater can be reduced and separated to generate high-purity arsenic elementary substance and arsenic trioxide products. Compared with the prior art, the method has the advantages that generation and accumulation of arsenic-containing solid wastes are avoided, the risk of secondary pollution is eliminated, and efficient recovery and resource utilization of the arsenic element are realized.

The invention discloses a method for regenerating and recycling a titanium-based arsenic removal agent, which comprises the following steps: (1) mixing a titanium-rich material with a sulfuric acid solution, and carrying out roasting reaction to obtain a roasted material A as the titanium-based arsenic removal agent used for the first time; the method comprises the following steps: adding a titanium-based arsenic removal agent into an arsenic-containing acid solution, and carrying out solid-liquid separation to obtain arsenic-removed slag and arsenic-removed solution; (2) mixing the arsenic-removed slag with a sulfuric acid solution and sulfur, carrying out a reduction roasting reaction to obtain a roasted material B, and condensing gas released by the reaction to obtain a mixture of sulfuric acid and arsenious acid; (3) cooling the mixture of sulfuric acid and arsenious acid to below 10 DEG C, and performing centrifugal separation to obtain arsenic trioxide solid and a sulfuric acid solution; (4) mixing the arsenic-removed liquid with macroporous composite exchange resin, and carrying out titanium removal reaction to obtain titanium-loaded resin and purified liquid; and (5) mixing the titanium-loaded resin with the arsenic-containing acid solution, and separating resin particles from the slurry containing the titanium arsenate precipitate by using a solid-liquid separation device to obtain regenerated resin and titanium arsenate thin slurry.

The invention discloses arsenic trioxide preparation equipment and a preparation method thereof.The arsenic trioxide preparation equipment comprises a filter press and a cooling crystallization device, the filter press comprises a rack, and a plurality of filter plates are transversely and movably mounted on the rack; the pressing mechanism is used for pushing and pressing the plurality of filter plates; the multifunctional filter pressing mechanism comprises a pressurizing air inlet assembly used for outwards pushing filter cloth of the filter plate and a plurality of pushing blocks fixedly connected to the filter cloth, and a vibration block is installed between every two adjacent pushing blocks in a telescopic mode; the cooling and crystallizing device comprises a cooling and crystallizing tank of which the upper end part is provided with a feeding pipe which is connected to the discharging pipe of the filter press through a pump; and the stirring mechanism is used for mixing and stirring the materials entering the cooling crystallizing tank. The device can effectively assist in improving the overall solid-liquid separation rate of the arsenic filter cake slurry, pumping of crystallized arsenic leaching liquid can be conveniently completed, and the solid-liquid separation workload of subsequent products can be effectively reduced.

The invention discloses a method for recovering arsenic from high-arsenic smoke dust, wherein high-arsenic smoke dust and a carbon reducing agent are mixed to obtain a high-arsenic smoke dust mixed material, and the high-arsenic smoke dust mixed material is roasted in an inert or reducing atmosphere to obtain arsenic-containing tail gas and high-lead ash; the arsenic-containing tail gas is passed into a combustion furnace, and an activator is sprayed into the combustion furnace through a pulse powder spray valve for combustion to obtain high-temperature flue gas; the high-temperature flue gas is condensed to obtain arsenic trioxide. A device for recovering arsenic from high-arsenic smoke dust comprises a roasting furnace, a combustion furnace, a settling chamber, a dust collector, a spray tower, and an external exhaust chimney that are connected in sequence; the roasting furnace comprises a furnace and a continuous feeding device for introducing materials containing high-arsenic smoke dust into the furnace for roasting, and a mixing bin is arranged above the continuous feeding device. The dearsenication process of the invention has good dearsenication selectivity and stability, an arsenic removal efficiency of up to 96.0% or more, and the purity of the purified arsenide reaches more than 98.0%.

The invention discloses an arsenic-containing flue gas purification and arsenic resource high-value recovery process which comprises the following steps: step 1, flue gas pretreatment: removing large-particle smoke dust through a dust remover; 2, waste heat recovery, wherein the high-temperature flue gas is introduced into a waste heat boiler to recover flue gas waste heat; 3, spray cooling: introducing the flue gas into a spray tower, reversely atomizing, spraying water, absorbing heat, and condensing to form crystals; step 4, crystal stripping: scraping, stripping and collecting the crystals through a mechanical scraper device to obtain coarse arsenic trioxide crystals; step 5, settling and slow cooling: pouring the residual gaseous arsenic trioxide into a cooling settling tank by a negative pressure fan for slow cooling settling; step 6, dissolving and recrystallizing: adding deionized water into the crystal, heating for dissolving, filtering the solution after impurity precipitation, carrying out solid-liquid separation, cooling and recrystallizing to obtain a high-purity arsenic trioxide crystal; according to the arsenic trapping device, efficient trapping of arsenic is achieved through crystallization on the wall of the spray tower and slow cooling of the settling tank, crystals are stripped in real time through the mechanical scraper, and the stubborn disease that equipment is scaled and blocked is radically treated.

The invention belongs to the field of environmental protection, and discloses a method for recovering arsenic trioxide from arsenite-containing wastewater. According to the method, arsenite in the wastewater can be converted into arsenic trioxide, resource recycling of arsenic is achieved, waste is turned into wealth, and the problem of accumulation of a large amount of arsenic-containing solid waste generated by a traditional water treatment technology and the risk of secondary pollution are avoided. The method has the advantages of being short in technological process, high in arsenic recovery rate and the like, and has profound significance for improving the economic benefits of enterprises and walking a green and sustainable development road.

The invention relates to a purification method of crude arsenic trioxide, and belongs to the technical field of metallurgy. The specific process comprises the following steps: firstly, drying crude arsenic trioxide containing about 85-95% of arsenic, then conveying the dried arsenic trioxide to a full-automatic belt type electric furnace in a closed manner, extracting and volatilizing arsenic-rich flue gas into a settling chamber under negative pressure by adopting a multi-section multi-zone gradient temperature control distillation-steam slow cooling crystallization-step grade purification process, so as to obtain fine As2O3 with the purity of 99.5% or above, evaporation arsenic removal residues are returned to an oxygen pressure leaching process to recover valuable metals such as copper and lead, and tail gas subjected to sedimentation dust collection is subjected to bag dust collection treatment and is sent to a metal arsenic working procedure. The method is easy to operate, efficient and stable in purification effect and low in production cost, zero pollution and zero emission of the arsenic extraction process are achieved, the problems of purification of crude arsenic smoke dust and recovery of high-purity white arsenic in copper smelting enterprises are solved, the As2O3-1 grade arsenic trioxide product is efficiently and economically prepared in an environment-friendly and energy-saving mode, and industrial application is achieved.

The invention discloses a valence state regulation and control method for arsenic leaching through arsenic sulfide oxygen control. The valence state regulation and control method comprises the following steps that firstly, preparation before slurrying is conducted, wherein sulfuric acid is added into liquid obtained after arsenic removal to adjust the liquid obtained after arsenic removal; step 2, slurrying: adding copper sulfate with the mass fraction of 5% into the arsenic sulfide slag, uniformly mixing, and then adding the adjusted arsenic-removed liquid; step 3, slurry adjustment and preheating: preheating the slurry to 70-80 DEG C, and adjusting the slurry by using the adjusted arsenic-removed liquid; 4, arsenic sulfide slag oxygen control leaching, wherein the mixed solution obtained in the step 3 is transferred into a reaction kettle; 5, reduction of the arsenic immersion liquid through SO2, wherein a certain amount of SO2 is added into the arsenic immersion liquid, and As < 5 + > in the arsenic immersion liquid is reduced into As < 3 + >; and step 6, cooling crystallization: cooling the solution obtained in the step 5 to 30 DEG C or below, separating out arsenic trioxide crystals, and filtering and purifying to obtain the arsenic trioxide crystals with higher purity. According to the method, the concentration of As < 5 + > in the arsenic immersion liquid is reduced, so that the usage amount of SO2 during reduction is reduced, the production cost of white arsenic is reduced, and the economic benefit is improved.

The invention belongs to the technical field of metallurgy, and particularly relates to a method for synergistically recovering valuable elements from high-arsenic alkaline wastewater and black copper sludge, which comprises the following steps: S1, adding the black copper sludge into the high-arsenic alkaline wastewater, reacting, and carrying out solid-liquid separation to obtain arsenic-rich liquid and copper slag; s2, sulfuric acid is added into the arsenic-rich liquid obtained in the step S1, and arsenic trioxide slag and low-arsenic wastewater are obtained after reaction; s3, evaporating and concentrating the low-arsenic wastewater obtained in the step S2 to obtain sodium sulfate and evaporation mother liquor. According to the method, the chemical properties of the high-arsenic alkaline wastewater and the black copper sludge are combined for treatment, valuable elements such as arsenic and copper are recycled, the production cost for independently treating the high-arsenic alkaline wastewater and the black copper sludge is reduced, the purposes of treating waste with waste and turning waste into wealth are achieved, the problem of heavy metal pollution in the recycling process is avoided, and the method is suitable for industrial production. The method has the advantages of short process flow, high metal recovery rate, low treatment cost and the like.

The application discloses a comprehensive recovery method of high-arsenic multi-metal hazardous waste, and comprises the following steps: after high-arsenic multi-metal hazardous waste and a reducing agent and a sulfuration agent are proportioned according to a predetermined ratio, a mixture is obtained; the mixture is added into a top-blown furnace to perform reduction sulfuration smelting, so that first furnace slag, mixed matte, crude lead and first waste gas are obtained, wherein the mixed matte comprises sulfides of arsenic, lead, copper and iron; the first furnace slag and the crude lead are discharged, the first waste gas is treated and then discharged; the mixed matte is subjected to oxygen-enriched blowing in the top-blown furnace, so that second furnace slag, crude copper and second waste gas are obtained; after arsenic trioxide in the second waste gas is recovered, the second waste gas is treated and then discharged. The method is suitable for treating arsenic-containing multi-metal materials, and can also be used for treating industrial wastes without arsenic; the top-blown furnace adopts periodical operation, is very suitable for small-scale hazardous waste disposal production systems, and can save investment and reduce cost.

The invention discloses a method for efficiently recovering As2O3 in copper smelting arsenic-rich ash, and relates to the field of copper smelting arsenic-rich ash, the method comprises the following steps: pretreatment: crushing the copper smelting arsenic-rich ash, screening until the particle size is less than or equal to 150 microns, and removing mechanical impurities; low-temperature sulfuric acid curing: mixing the pretreated arsenic-rich ash with a sulfuric acid solution in proportion, carrying out low-temperature curing reaction under a stirring condition, controlling the curing temperature to be 50-90 DEG C and the reaction time to be 2-6 hours, and generating cured flue gas containing As2O3; collecting flue gas; carrying out gradient condensation collection and tail gas treatment; according to the method for efficiently recycling As2O3 in the arsenic-rich ash in copper smelting, the arsenic removal rate is high, specifically, through low-temperature sulfuric acid curing phase regulation and control, the arsenic removal rate is larger than or equal to 98% and is obviously superior to 85%-92% of the prior art; the produced As2O3 product is high in purity, low in energy consumption, small in environmental pollution, high in phase conversion efficiency, high in process stability, wide in raw material adaptability and remarkable in economic benefit.