A method for preparing metallic arsenic and sulfur fixation by calcium oxide assisted carbothermic reduction of arsenic sulfide residue

CN122105152AActive Publication Date: 2026-05-29CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CENT SOUTH UNIV
Filing Date
2026-04-29
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies require two-step smelting to process arsenic sulfide slag, which leads to increased energy consumption, the production of hazardous waste byproducts, high costs, and difficulty in efficiently recovering metallic arsenic and fixing sulfur.

Method used

The method of using calcium oxide-assisted carbothermic reduction of arsenic sulfide slag involves reacting in a temperature gradient between a high-temperature zone and a low-temperature zone. The generated metallic arsenic is transferred to the low-temperature zone, while the calcium sulfide remains in the high-temperature zone, thus achieving one-step smelting, recovery of metallic arsenic, and sulfur fixation.

Benefits of technology

This method achieves efficient recovery of metallic arsenic, avoids the generation of sulfur-containing gases, reduces energy consumption and costs, and improves the purity and recovery rate of metallic arsenic.

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Abstract

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.
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