7 results about "Arsenic product" patented technology

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 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.