13 results about "Arsenic Sesquioxide" patented technology

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 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 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 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.

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.

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 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 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.

This application discloses a treatment system and process for recovering rhenium from arsenic sulfide slag. The system uses an oxygen pressure reduction unit to convert rhenium in the arsenic sulfide slag into soluble rhenium ions and arsenic into solid-phase arsenic trioxide. The rhenium-containing solution, separated by a solid-liquid separation unit, is filtered by a pretreatment unit and then sent to an ion exchange unit. A three-in-one-standby cyclic replenishment series adsorption resin group selectively adsorbs the rhenium-containing solution. An online rhenium concentration detector and controller enable the switching and offline regeneration of the saturated first column in the series adsorption resin group. The regenerated rhenium-rich solution is concentrated, re-dissolved, filtered, and cooled to crystallize in an evaporation-redissolution-crystallization unit to obtain ammonium rhenium crystals. This application utilizes oxygen pressure reduction to simultaneously complete the conversion and separation of arsenic in the leaching process, simplifying the process flow. The three-in-one-standby resin group ensures continuous production, and the evaporation-redissolution-crystallization unit improves the purity of the recovered rhenium, achieving efficient and high-purity rhenium recovery.