42 results about "Arsenic Sesquioxide" patented technology

The invention belongs to the technical field of dangerous solid waste resource recovery in the nonferrous smelting industry, and discloses a method for recovering arsenic trioxide by leaching arsenic sulfide slag from ferrihydrite. The arsenic sulfide slag is leached by ferrihydrite in an acid solution under the normal pressure condition, so that the leaching rate of arsenic in the arsenic sulfide slag is increased; and sulfur dioxide gas is introduced into the leachate to reduce arsenic in the solution, finally arsenic trioxide is obtained through evaporation concentration and cooling crystallization, meanwhile, oxygen is introduced into the crystallized liquid to oxidize and recycle iron, and cyclic utilization of resources is achieved. The method has the characteristics of simplicity and convenience in operation, low cost, safety, reliability and the like, the arsenic sulfide slag can be effectively recycled to prepare the arsenic trioxide product, and the purpose of treating waste with waste is achieved.

The invention provides a metal arsenic preparation system. The metal arsenic preparation system comprises a conveyor belt feeding machine, a reduction reaction furnace, a gas-solid separator, a crystallizer and a carbon powder recovery assembly. The conveyor belt feeding machine is used for conveying arsenic trioxide solids; the reduction reaction furnace can effectively carry out reduction reaction on arsenic trioxide solid and carbon powder under a high-temperature condition to generate arsenic gas and carbon dioxide gas. The gas-solid separator enables arsenic gas and carbon dioxide gas generated by the reaction to be efficiently separated from unreacted carbon powder. The crystallizer enables arsenic gas to be fully condensed and crystallized into metal arsenic solids, and a fixed exhaust port and a gas exhaust port in the crystallizer are respectively used for discharging the metal arsenic solids and carbon dioxide gas, so that effective separation and collection of products are realized. Due to the arrangement of the carbon powder recycling assembly, the carbon powder can be recycled again, the resource utilization rate is remarkably increased, the production cost is reduced, and the economical efficiency and sustainability of the whole device are improved.

The utility model relates to a novel intermittent arsenic reduction tank air pipe cleaning device which comprises an arsenic reduction tank body, an air pipe and a cleaning mechanism, the outer side wall of the arsenic reduction tank body is fixedly connected with a communicating pipe communicated with the arsenic reduction tank body, the air pipe is vertically connected with the communicating pipe, and the air pipe is communicated with the communicating pipe. A cleaning mechanism is mounted at the end, away from the arsenic reduction tank body, of the communicating pipe, and a limiting block is fixedly connected to the inner wall of the communicating pipe; the cleaning mechanism comprises an air cylinder, a movable rod, a connecting column and a drill bit. Compared with the prior art, the device has the beneficial effects that by utilizing the telescopic action of the air cylinder and combining the movement of the connecting column in the spiral groove, not only is the linear movement of the connecting column realized, but also the rotation action of the connecting column is realized, accumulated stubborn arsenic scales are efficiently cleaned, manual cleaning is replaced by an automatic cleaning mode, and the cleaning efficiency is improved. The risk that an operator is in contact with toxic substances is reduced, the possibility of poisoning and casualty caused by leakage of sulfur dioxide and arsenic trioxide is reduced, and the safety of a working place is improved.

The invention discloses a method and a device for deeply purifying an arsenic solution and preparing high-purity arsenic oxide. The method comprises the following steps: oxidizing antimony impurities in an arsenic solution, precipitating, deeply removing, adding a reducing agent to reduce pentavalent arsenic in the solution into trivalent arsenic, decomposing, evaporating, cooling and crystallizing to obtain the high-purity arsenic trioxide. Wherein oxidation precipitation is carried out in a purification tank, reduction is carried out in a reduction tank, the purification tank and the reduction tank are located in the same box body and are separated by a filter screen and a partition plate in the middle, precipitated arsenic antimonate generated after purification in the purification tank is intercepted through the filter screen, and filtrate enters the reduction tank; during reaction, the partition plate is started for use to prevent the solution from flowing. The filtrate enters a reduction tank, reducing agents such as sulfur dioxide are introduced, pentavalent arsenic in the solution is further reduced to form trivalent arsenic, and a high-purity arsenic trioxide product (As2O3 is larger than or equal to 99.5%, and Sb is smaller than or equal to 0.05%) is prepared.

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 invention belongs to the technical field of waste resource utilization, and particularly relates to a method for preparing crude arsenic by recycling arsenic-containing hydrogen gas. The method comprises the following steps: in an oxygen-isolated environment, introducing arsenic hydride-containing gas into a sulfuric acid aqueous solution with the mass fraction of 70%-98%, carrying out an oxidation-reduction reaction to obtain slurry containing crude arsenic, and carrying out solid-liquid separation to obtain a crude arsenic product. According to the method, the arsenic hydride gas can be directly converted into the arsenic elementary substance, so that the recovery of arsenic in the arsenic-containing material is realized. Concentrated sulfuric acid can fully oxidize arsenic hydride in a specific concentration range, and the arsenic hydride is prevented from being excessively oxidized into arsenic trioxide. Compared with other acidic or oxidizing solutions, the method has the advantages that the crude arsenic product with the purity larger than or equal to 95% can be directly obtained under the normal-temperature and normal-pressure conditions, the generated by-product dilute sulphuric acid can be circularly used for absorbing arsenic hydride again or used for leaching materials such as zinc arsenate-containing smoke dust to generate new arsenic hydride-containing gas, and therefore a closed-loop circulation process is formed; and efficient resource recovery and environment-friendly treatment are realized. The method is short in technological process, low in equipment requirement and small in energy consumption, the crude arsenic can be used as a precursor for preparing the high-purity arsenic, and a feasible scheme is provided for safety treatment and resource utilization of arsenic hydride in the industrial processes of metallurgy, wet refining and the like.

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.

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 method for removing arsenic in anode slime and enriching precious metals, which comprises the following steps: mixing the ground anode slime with concentrated sulfuric acid, a carbonaceous reducing agent and chlorine salt to form a mixture, and roasting the mixture for the first time to convert base metals in the anode slime into soluble salts and convert an arsenic-containing phase into arsenic trioxide; heating the mixture after the first roasting, and roasting for the second time to volatilize the arsenic trioxide to obtain roasted sand; carrying out acid leaching treatment on the roasted product, and filtering to obtain a base metal salt-containing solution and a noble metal enriched product; according to the method, efficient volatilization removal of arsenic in the anode mud, efficient removal of base metal and efficient enrichment of precious metal can be achieved, and the removal rate of arsenic is gt; the removal rate of base metals is gt; the method has the advantages that the arsenic removal rate is high, the precious metal is efficiently enriched, the recovery rate is high, the operation is simple and convenient, and the like.

The invention discloses a smokeless and odorless firework oxidant which is prepared from the following components: zirconium dioxide, hafnium dioxide, silicon dioxide, manganese dioxide, iron oxide, arsenic trioxide and calcium oxide. Wherein the weight ratio of zirconium dioxide is not less than 90%; all the components are mixed, calcined and then subjected to wet ball milling, and a powdery material is obtained. The firework oxidizing agent is suitable for firework firework compositions, can be widely applied to firework spraying compositions and launching compositions, and is smokeless and odorless during combustion; the firework oxidant is not easy to decompose, good in stability, zero in friction sensitivity and impact sensitivity and suitable for high-automation-degree production, and the safety risk of production and transportation is greatly reduced.

The invention relates to the technical field of comprehensive utilization of dangerous solid waste resources, in particular to a process for extracting multi-metal resources in high-arsenic indium-containing smoke dust, which comprises the following steps: mixing and roasting, obtaining arsenic trioxide and roasting slag, carrying out high-acid leaching treatment on the roasting slag, dissolving indium, and separating lead and bismuth in the roasting slag to obtain a high-indium solution; separating indium and zinc, and performing back extraction; according to the method, the indium-containing waste electrolyte and the high-indium solution are mixed, then the extracting agent is used for extraction, the acidity and the indium concentration of the high-indium solution can be reduced, the extraction recovery rate can be increased, and valuable metal in the waste electrolyte can be recycled. The electrolyte is driven by external force to generate rotational flow, so that the concentration of ions near the electrode is increased under the action of centrifugal force, indium metal is directly obtained, the step of replacing by using zinc powder is omitted, the cost of the indium metal extraction process is reduced, and the extraction efficiency of the indium metal is improved.

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 utility model provides a circulating fluidization carbon thermal reduction device for preparing metal arsenic. The circulating fluidization carbon thermal reduction device comprises a reduction reaction furnace, a gas-solid separator, a crystallizer and a carbon powder recovery assembly. The reduction reaction furnace can effectively carry out reduction reaction on arsenic trioxide solid and carbon powder under a high-temperature condition to generate arsenic gas and carbon dioxide gas. The gas-solid separator enables arsenic gas and carbon dioxide gas generated by the reaction to be efficiently separated from unreacted carbon powder. The crystallizer enables arsenic gas to be fully condensed and crystallized into metal arsenic solids, and a fixed exhaust port and a gas exhaust port in the crystallizer are respectively used for discharging the metal arsenic solids and carbon dioxide gas, so that effective separation and collection of products are realized. Due to the arrangement of the carbon powder recycling assembly, the carbon powder can be recycled again, the resource utilization rate is remarkably increased, the production cost is reduced, and the economical efficiency and sustainability of the whole device are improved.

The application discloses a device for separating and recovering valuable metals and arsenic in flue gas, which comprises a filter dust collecting chamber, a cooling chamber, a flue and a bag dust collecting chamber. The filter dust collecting chamber is used for filtering valuable metal particles in flue gas. The cooling chamber is communicated with an air outlet of the filter dust collecting chamber. A spraying assembly is arranged in the cooling chamber. The spraying assembly is used for spraying mist to cool the flue gas to a temperature at which gaseous arsenic trioxide in the flue gas is condensed into glass. The flue is arranged above the cooling chamber and communicated with a top air outlet of the cooling chamber. The flue defines a flue gas passing channel extending in the up-down direction. The cross-sectional area of the flue gas passing channel gradually increases from bottom to top. The bag dust collecting chamber is communicated with an air outlet of the flue and used for collecting arsenic trioxide in the glass state. The device for separating and recovering valuable metals and arsenic in flue gas has the advantages of high recovery efficiency of valuable metals and arsenic trioxide, low requirement and cost of subsequent flue gas treatment.

The present invention discloses a photoelectric information leakage protection film and a preparation method thereof, comprising a base layer and a protective layer cured on top of the base layer. The protective layer has a thickness of 1-100 μm and is formed by mixing nanosilver wires and indium tin oxide / cesium tungsten bronze / arsenic trioxide, and then being coupled to the upper surface of the base layer by a one-step coating method. The plurality of nanosilver wires are overlapped and stacked to form an irregular conductive grid. The weight ratio of the nanosilver wires to indium tin oxide / cesium tungsten bronze / arsenic trioxide is between 1:9 and 9:1. The protective layer can reflect electromagnetic signals, preventing electromagnetic radiation signals from passing through the protective layer and generating electromagnetic leakage from the incident direction, while also preventing incident infrared lasers from forming infrared outgoing light from the incident direction.

The application belongs to the field of chemical production, and particularly designs a method for preparing arsenic trioxide from arsenic sulfide residue, comprising the following steps: step SA1: mixing and slurrying arsenic sulfide residue with a first residue leaching solution, passing in oxygen, and catalytically oxidizing leaching to obtain first leaching residue and first leaching solution; the first residue leaching solution is a solution comprising sulfuric acid, an iron salt, and nitrate and / or nitrite; step SA2: cooling and crystallizing the first leaching solution to obtain arsenic trioxide product and first arsenic precipitation solution. Compared with the prior art, the scheme of the application can prepare the target product using environmentally friendly oxygen, and since the catalytic components in the first residue leaching solution are consumed as catalysts, the first arsenic precipitation solution can be continuously recycled without a special regeneration step, which is more green, cost-saving, and efficient.

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 belongs to the technical field of metallurgy, and discloses a method for efficiently recovering multiple elements in smelting smoke dust. The method comprises the following steps that S1, smoke dust is leached through sulfuric acid and hydrogen peroxide, zinc, copper and arsenic enter a solution, and lead, gold and silver are left in slag; s2, activated arsenic sulfide is added into the pickle liquor, copper is selectively precipitated to obtain copper sulfide slag, and meanwhile arsenic is further enriched in the solution to obtain arsenic-rich liquor; and S3, the acid leaching residues, the copper sulfide residues and the arsenic-rich liquid are treated correspondingly, and lead, gold, silver, copper, arsenic trioxide and zinc sulfate are recycled. According to the method, efficient separation and full-quantification recovery of multiple metals are achieved, especially harmful arsenic is converted into valuable products, the technological process is clean and environmentally friendly, the resource utilization rate is high, and economic benefits and environmental benefits are remarkable.

The invention discloses a device and a method for preparing an arsenic-iron alloy from arsenic oxide and iron oxide. The device comprises a raw material bin, a mixer, a briquetting machine, a block mass bin, a rotary kiln and a briquetting machine, a raw material conveying belt is arranged below the raw material bin; the tail end extends to the upper part of the feeding hole of the mixer; a discharging hole of the mixer is connected with a feeding hole of the briquetting machine through a mixed material conveying belt; a discharging hole of the briquette pressing machine is connected with a feeding hole of the briquette bin; a discharging opening of the block mass bin is connected with a feeding opening of the rotary kiln through a block mass conveying slide way; a rotary kiln discharge port is connected with the head end of the furnace charge conveying belt; the tail end of the furnace burden conveying belt is connected with a feeding port of the briquetting machine The method comprises the following steps: (1) mixing arsenic trioxide powder with pulverized coal, iron oxide powder and reduced iron powder, pressing into balls, aging and drying; (2) calcining; and (3) forming. The device is reasonable in structure, convenient to operate, low in cost and environmentally friendly. The arsenic-iron alloy obtained by the method is low in leaching amount of arsenic, environment-friendly, energy-saving, simple and convenient in process, low in cost and suitable for industrial production.

This gallium arsenide single crystal substrate has a circular-shaped main surface and has R1, R2, R3, R4, R5, and R6, which are first integrated intensity ratios. The first integrated intensity ratio is obtained by determining the spectrum of the detected intensity of 3d electrons of arsenic with respect to the binding energy of photoelectrons emitted to the outside of the gallium arsenide single crystal substrate on the basis of X-ray photoelectron spectroscopy in which X-rays are irradiated on the center of the main surface under specific conditions. The first integrated intensity ratio is the integrated intensity of elemental arsenic present as arsenic pentoxide to the sum of the integrated intensity of elemental arsenic present as arsenic pentoxide, the integrated intensity of elemental arsenic present as arsenic trioxide, the integrated intensity of elemental arsenic present as gallium arsenide, and the integrated intensity of elemental arsenic present as metallic arsenic. At least one of R2, R3, and R4 satisfies the relationship of being the largest among R1, R2, R3, R4, R5, and R6.

This invention discloses a pre-arsenic removal and arsenic recovery system and process for arsenic-containing gold concentrate based on a steel belt furnace, belonging to the field of arsenic-containing mineral resource processing technology. The system includes a raw material processing unit, an arsenic removal unit, a flue gas treatment unit, and a product collection unit, with its core equipment being a sealed, slightly negative-pressure steel belt furnace. The process involves evenly spreading the arsenic-containing gold concentrate onto the conveyor belt of the steel belt furnace using a feeding device, completing the pre-arsenic removal reaction at a temperature of 580-650℃ under slightly negative pressure conditions, and obtaining low-arsenic gold concentrate after cooling. The generated arsenic-containing flue gas is treated through secondary combustion of natural gas, pipeline crystallization, and baghouse dust collection to recover arsenic trioxide. The tail gas is treated by an absorption tower before being discharged in compliance with standards. This invention can remove arsenic from gold concentrate with an arsenic content of 10-15% to below 0.5%, with a unit processing cost of only 700 yuan / ton. It effectively solves the technical problems of difficult removal of sulfur arsine and easy pipeline blockage in existing technologies, combining high efficiency, environmental friendliness, and economy.

The present invention relates to the technical field of harmless treatment of arsenic-containing hazardous waste residues, and discloses a method for harmlessly treating hazardous waste residues containing arsenic oxide and sulfur and recovering arsenic oxide. The present invention realizes the harmless treatment of arsenic-containing hazardous waste residues through a gradual physical and chemical separation method and obtains elemental sulfur and arsenic trioxide, and no smoke is generated, and no secondary pollution is generated. The obtained two materials have a wide range of uses and can generate huge economic value. The present invention solves the problems of incomplete treatment and environmental pollution in the process of harmless treatment of various arsenic residue hazardous wastes; complex system and high cost.

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.

This invention discloses a method for treating and reusing arsenic sulfide slag, belonging to the field of arsenic sulfide slag resource recovery technology. This method separates arsenic and metal elements from arsenic sulfide slag in one step by adding sodium hydroxide, and simultaneously converts arsenic and some sulfur into arsenic trioxide and elemental sulfur by adding oxygen and sulfur dioxide. This invention effectively separates and recovers valuable metals, sulfur, and arsenic from arsenic sulfide slag through a wet process, converting them into economically valuable industrial raw materials. It reduces the loss of valuable metals, avoids environmental risks caused by the leakage of toxic substances, and has a relatively simple process flow, combining environmental and economic benefits.

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 provides a method for purifying a copper electrolyte by using a bagging type antimony-based adsorbent, which specifically comprises the following steps: taking an antimony oxide as an adsorbent, taking a flexible grid type material as a protective sleeve, throwing the bagging type adsorbent into the copper electrolyte containing arsenic, antimony and bismuth, and after reacting for a period of time, taking out the bagging type adsorbent, washing and drying. And roasting to remove arsenic, condensing the arsenic-containing flue gas to obtain solid arsenic trioxide, and directly returning arsenic-removed slag as a new adsorbent to the copper electrolysis adsorption unit for purification and impurity removal. The method is simple in process and convenient to operate, physical and mechanical loss caused by strong dispersity of the antimony-based adsorbent can be remarkably reduced or avoided, a filtering unit is not needed, the use amount of washing water is reduced, the pyrogenic process regeneration process can effectively replace an acid process or alkaline process scheme, and the purification efficiency of the regenerated adsorbent on the copper electrolyte is equivalent to the effect of an initial adsorbent.

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.