一种含砷、锌、铟废酸零排放综合回收工艺
By producing hydrogen sulfide gas from self-generated arsenic sulfide slag, the problem of high safety risks and high costs in the preparation of hydrogen sulfide gas in existing technologies has been solved. This has enabled the efficient zero-emission recovery of waste acid containing arsenic, zinc, and indium, improved the indium recovery rate, and reduced the complexity and cost of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- YUNNAN TIN
- Filing Date
- 2024-03-28
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies for treating waste acid containing arsenic, zinc, and indium suffer from problems such as complex processes, high costs, significant safety risks, and difficulty in achieving resource utilization. In particular, the preparation of hydrogen sulfide gas is fraught with safety risks and high costs, and it is difficult to achieve zero emissions of waste acid.
The process utilizes self-produced arsenic sulfide slag to generate hydrogen sulfide gas. The arsenic sulfide slag is heated under inert gas protection, which preferentially volatilizes arsenic sulfide vapor. The vapor then reacts with water vapor to generate hydrogen sulfide gas, which is used to wash waste acid containing arsenic, zinc, and indium. This avoids the use of extractants and achieves indium recovery and zero emissions.
It achieves low safety risks and low cost in the preparation of hydrogen sulfide gas, improves indium recovery rate, avoids the introduction of impurities, realizes the comprehensive recovery of indium, zinc and arsenic in waste acid with zero discharge, and reduces operation complexity and cost.
Smart Images
Figure CN118256722B_ABST