14 results about "Arsenic product" patented technology

The invention belongs to the technical field of environmental engineering and resource recovery, and particularly relates to a method for preparing elemental arsenic from high-arsenic acid wastewater by using a Me-C reduction method. According to the method, arsenic in the wastewater is efficiently reduced to be in a high-purity elemental state (As0) mainly through the micro-electrolysis effect; the method comprises the following steps: reducing arsenic in the mine high-arsenic acid wastewater by using Me-C to obtain a crude arsenic product, further improving the purity of the arsenic product by using an existing distillation technology to obtain impurities and an arsenic-removed product, returning the impurities to the reduction arsenic extraction process to save the cost, neutralizing and removing impurities from the low-arsenic liquid to obtain a purified liquid, and returning the purified liquid to the enterprise production process for recycling. The method has the advantages of efficient wastewater purification and high yield of the elemental arsenic, the elemental arsenic is recovered while the wastewater is purified, the arsenic content in the treated solution is greatly reduced, and the subsequent treatment cost is reduced.

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 invention discloses a selective regulation and control and directional enrichment method and system for metal arsenic crystal forms in arsenic-containing gypsum residues and an alpha crystal form-metal arsenic product, and belongs to the technical field of nonferrous metallurgy and secondary resource recovery. The method comprises the following steps: under an anaerobic condition, carrying out a reduction reaction on the arsenic-containing gypsum slag and a reducing carbonaceous material to obtain metal arsenic vapor; carrying out gradient condensation on the metal arsenic steam to obtain a solid metal arsenic product; the gradient condensation comprises three condensation zones: the temperature of the first condensation zone is 420-450 DEG C, the temperature of the second condensation zone is 360-390 DEG C, and the temperature of the third condensation zone is 300-330 DEG C; and the solid metal arsenic product is cooled to 80 DEG C or below at the cooling rate not lower than 50 DEG C / min, and an alpha crystal form-metal arsenic product is obtained. According to the method, the high-valued arsenic is realized, the sulfur element is synergistically cured, the resource utilization of the residues is realized, and finally, the near-zero emission of the whole treatment process is achieved.

The application discloses a method for continuously preparing elemental arsenic from arsenic-containing materials. The method comprises the following steps: mixing the arsenic-containing materials with carbon powder to perform reduction roasting, so as to obtain arsenic-containing steam; contacting the arsenic-containing steam with spraying water to perform condensation, so as to obtain slurry containing gamma-state elemental arsenic; and after the slurry containing gamma-state elemental arsenic is subjected to reverse flotation and impurity removal, solid-liquid separation and drying are performed, so as to obtain the elemental arsenic product. The method can not only effectively solve the problems of discontinuous work and low direct yield existing in the collection process of the existing elemental arsenic condenser, but also greatly reduce the content of impurities in the elemental arsenic, and the method is simple, fast, efficient and low in cost, and meets the industrial production.

The application provides a method for recovering metallic arsenic from arsenic sulfide residue by using calcium carbonate and a carbon source, comprising: providing a reaction container with a high-temperature zone and a low-temperature zone in communication; reacting arsenic sulfide residue, calcium carbonate and a carbon source in the high-temperature zone; during the reaction, the generated metallic arsenic is transferred to the low-temperature zone; the molar ratio of the calcium carbonate to the arsenic sulfide in the arsenic sulfide residue is not less than 3; the molar ratio of the carbon element in the carbon source to the arsenic sulfide in the arsenic sulfide residue is not less than 3; the temperature of the high-temperature zone is 800-950 DEG C, and the temperature of the low-temperature zone is 600-750 DEG C. Based on the combined treatment of the calcium carbonate and the carbon source, the application can recover the metallic arsenic from the arsenic sulfide residue in one step, and can ensure the recovery rate and purity of the metallic arsenic product.

The invention discloses a method for efficiently removing arsenic from a crude germanium tetrachloride solution based on arsenic hydride reduction, and belongs to the technical field of rare and noble metal metallurgy. According to the method, arsenic hydride gas is introduced into a crude germanium tetrachloride solution containing arsenic impurities under the protection of inert atmosphere and under the mild condition of 20-80 DEG C; the arsenic hydride and arsenic compounds such as arsenic trichloride, arsenious acid and arsenic acid in the solution are subjected to selective reduction reaction to generate simple substance arsenic solid precipitate. Then a germanium tetrachloride solution subjected to deep arsenic removal can be obtained through simple solid-liquid separation operation, obtained arsenic-containing solids are washed and dried, and resource recycling of crude arsenic products is synchronously achieved. The method provided by the invention initiates a new arsenic removal path of reduction-precipitation, has the outstanding advantages of high arsenic removal efficiency, good selectivity, short process flow, no secondary pollution and capability of realizing arsenic resource utilization, and provides a brand new solution for green and efficient preparation of high-purity germanium tetrachloride.

The application provides a method for preparing metallic arsenic and sulfur fixation by calcium oxide assisted carbothermic reduction of arsenic sulfide residue, comprising: providing a reaction container with a high-temperature zone and a low-temperature zone in communication; reacting arsenic sulfide residue, calcium oxide and a carbon source in the high-temperature zone; the molar ratio of the calcium oxide to arsenic sulfide in the arsenic sulfide residue is not less than 2; the molar ratio of carbon in the carbon source to arsenic sulfide in the arsenic sulfide residue is not less than 2; the temperature of the high-temperature zone is 750-900 DEG C, the temperature of the low-temperature zone is 650-750 DEG C, and the temperature of the high-temperature zone is higher than that of the low-temperature zone; during the reaction, the generated metallic arsenic transfers to the low-temperature zone, and the generated calcium sulfide stays in the high-temperature zone. The application recovers metallic arsenic and fixes sulfur from arsenic sulfide residue through one-step smelting, avoids the generation of sulfur-containing gas, and improves the recovery rate of the metallic arsenic product.

The invention provides a method for synchronously recovering metal antimony and an arsenic-iron alloy from arsenic-alkali residues, and belongs to the technical field of resourceful treatment of solid wastes. According to the method, through the two-stage treatment process of high-temperature reduction treatment in the CO atmosphere and vacuum separation treatment after mixing with iron powder, the metal antimony and the arsenic-iron alloy can be synchronously recycled from the arsenic-alkali residues, the purity of the metal antimony can reach 91.9%, and the purity of the arsenic-iron alloy can reach 98.4%; according to the method, the arsenic and the antimony are completely separated at an extremely high limit, an arsenic-containing product is effectively digested, a sodium carbonate byproduct can be obtained in the process, the method can be directly applied to the fields of chemical engineering, smelting production, counter weight and the like, and comprehensive recovery of the arsenic and alkali residues is really realized.

The invention discloses a method for separating arsenic and antimony from high-arsenic soot, and belongs to the technical field of non-ferrous metal metallurgy. Adding water into the high-arsenic soot for leaching, and cooling and filtering after leaching to obtain leaching residues and leaching liquid; an oxidizing agent is added into the obtained leachate for oxidizing leaching, cooling and filtering are conducted after leaching, and oxidizing slag and oxidizing liquid are obtained; a reducing agent SO2 is added into the obtained oxidation liquid for a reduction leaching reaction, and white arsenic is obtained; or, sulfide is added into the obtained oxidation liquid for vulcanization leaching, cooling and filtering are conducted after leaching, and arsenic sulfide slag and arsenic precipitation liquid are obtained; and sulfide is added into the obtained arsenic precipitation liquid for a neutralization reaction, filtering is conducted after the reaction, arsenic sulfide residues are obtained, and tail liquid enters a water treatment procedure. According to the method, the leaching rate of arsenic is increased through wet oxidation leaching, different reducing agents are adopted for arsenic reduction precipitation according to market requirements, different arsenic-containing products are produced, and efficient separation of arsenic and antimony in the high-arsenic soot is achieved.

The present invention belongs to the field of environmental engineering and resource recovery technology, and specifically relates to a method for preparing elemental arsenic from high-arsenic acid wastewater using a Me-C reduction method. The present invention mainly uses micro-electrolysis to efficiently reduce arsenic in wastewater to a high-purity elemental state (As 0 ); first, Me-C is used to reduce arsenic in high-arsenic acid mine wastewater to obtain a crude arsenic product. Existing distillation technology is then used to further improve the purity of the arsenic product to obtain impurities and an arsenic-removed product. The impurities are returned to the reduction and arsenic extraction process to save costs. The low-arsenic solution is then neutralized and impurities removed to obtain a purified solution, which is then returned to the company's production process for reuse. This method combines the advantages of efficient wastewater purification with a high yield of elemental arsenic. While purifying the wastewater, elemental arsenic is recovered, and the arsenic content in the treated solution is significantly reduced, reducing subsequent processing costs.

The invention discloses a method for synergistically fixing arsenic from iron scale solid waste and high-arsenic hazardous waste, and relates to the non-toxic and harmless field of high-arsenic byproducts in non-ferrous metal metallurgy. According to the method, high-arsenic smoke dust is subjected to oxygen pressure acid leaching recovery to obtain lead-antimony concentrate, meanwhile, produced high-arsenic acid leaching liquid is completely transferred into a hydrothermal kettle, solid arsenic iron source iron scale powder is added, and regular octahedral scorodite is synthesized through oxidation and coprecipitation under the conditions of high temperature and high oxygen pressure. The arsenic concentration in the toxic leaching of the scorodite synthesized by the method meets the requirement of the specified value (less than or equal to 5mg / L) of the national standard (GB5085.3-2007), and the scorodite is a non-toxic and harmless solid arsenic product. The iron scale solid waste is dissolved in hydrothermal oxygen pressure to generate Fe < 2 + > and Fe < 3 + >, oxidation coprecipitation crystallization is promoted to obtain scorodite, and the efficient arsenic fixing effect is achieved. The method provided by the invention solves the problems of toxicity of high-arsenic hazardous waste and consumption of iron scale solid waste, and achieves the target of fixing arsenic with waste. The method has the advantages of simplicity in operation, high arsenic fixing efficiency, good arsenic fixing stability of scorodite and the like.

The application provides a method for preparing metallic arsenic and sulfur fixation by calcium oxide assisted carbothermic reduction of arsenic sulfide residue, comprising: providing a reaction container with a high-temperature zone and a low-temperature zone in communication; reacting arsenic sulfide residue, calcium oxide and a carbon source in the high-temperature zone; the molar ratio of the calcium oxide to arsenic sulfide in the arsenic sulfide residue is not less than 2; the molar ratio of carbon in the carbon source to arsenic sulfide in the arsenic sulfide residue is not less than 2; the temperature of the high-temperature zone is 750-900 DEG C, the temperature of the low-temperature zone is 650-750 DEG C, and the temperature of the high-temperature zone is higher than that of the low-temperature zone; during the reaction, the generated metallic arsenic transfers to the low-temperature zone, and the generated calcium sulfide stays in the high-temperature zone. The application recovers metallic arsenic and fixes sulfur from arsenic sulfide residue through one-step smelting, avoids the generation of sulfur-containing gas, and improves the recovery rate of the metallic arsenic product.

The invention discloses a method for efficiently separating lead and arsenic from copper smelting dust pickle liquor, and relates to the field of metallurgical wet separation, the method realizes lead and arsenic separation through a SO2 reduction-ammonium acetate selective dissolution two-step process, and specifically comprises the four steps of pickle liquor pretreatment, SO2 reduction lead deposition, ammonium acetate arsenic dissolution and lead and arsenic product purification; the reduction potential is regulated to be 300-400 mV, the temperature is 30-50 DEG C, lead is precipitated in the form of PbSO4, and the precipitation rate is larger than or equal to 98%; 200-400g / L ammonium acetate solution is adopted to selectively dissolve arsenic, the arsenic dissolution rate is greater than or equal to 97%, and the lead loss rate is less than or equal to 1%; the method has the advantages of high separation efficiency, recyclable medicament and no secondary pollution, and is suitable for industrial separation of lead and arsenic in the copper smelting smoke acid leaching solution.

The application discloses a combined inhibitor for pyrite and arsenopyrite flotation separation and application thereof, and belongs to the technical field of mineral flotation. The combined inhibitor is composed of disodium maleate and trisodium carboxymethyl alanine in a mass ratio of 1:(0.3-1). The combined inhibitor can be applied to the flotation separation of pyrite and arsenopyrite. The sulfur-arsenic material containing pyrite and arsenopyrite is ground and slurried to a pulp pH value of 7-9, and then the combined inhibitor, butyl sodium xanthate collector and methyl isobutyl carbinol frother are added in sequence, and through one roughing, three times of cleaning and one scavenging, low-arsenic sulfur concentrate and arsenic-containing products are obtained. The medicament used in the application has simple structure and is biodegradable, and the flotation is carried out in near-neutral to weak alkaline pulp, without the high-alkali and strong-alkali environment and oxidizing agent of the traditional arsenic inhibition process, and the operation condition is mild.