Abstract:

The arsenic content of the waste liquid in a resource recycling center is 142 000 mg/L, copper content is 15 800 mg/L, and pH < 0. The waste liquid was first reduced by NaHSO₃ and then filtered. The filter residue was dried to obtain As₂O₃, while the filtrate was replaced by iron to obtain sponge copper. The process conditions for recycling As₂O₃ and copper were optimized by orthogonal test. The test results showed that under the best process conditions, the recovery rate of arsenic reached 95.0%, and the mass fraction of As₂O₃ reached 94.0%, the copper recovery rate reached 98.0%, and the mass fraction of copper in copper slag reached 90.5%. Both recycled As₂O₃ and copper slag met the industrial raw material standards. The waste liquid of recovered arsenic and copper met'Integrated Wastewater Discharge Standard'(GB 8978-1996) by subsequent processing.

Key words: waste liquid containing arsenic and copper, arsenic trioxide, copper, recovery

摘要：

某资源回收中心的废液中砷高达142 000 mg/L，铜为15 800 mg/L，废液pH < 0。该废液经NaHSO₃还原、过滤、烘干可回收As₂O₃；所得滤液经铁置换可回收海绵铜。采用正交试验对As₂O₃、铜回收的工艺条件进行了优化。结果表明：在最佳工艺条件下，砷回收率达95.0%，所得As₂O₃质量分数达94.0%；铜回收率为98.0%，所得铜渣中铜质量分数达90.5%。回收所得As₂O₃、铜渣均达到工业原料标准。回收砷和铜的废液经后续处理后达到《污水综合排放标准》（GB 8978-1996）要求。

关键词: 含砷铜废液, 三氧化二砷, 铜, 回收

CLC Number: 

• X703