• 关键词：改性粉煤灰  选矿废水  锑  丁基黄原酸钠  浸出毒性

• 基金项目：中国科学院创新工程重要方向项目(No.kzcx2-yw-102);国家自然科学基金项目(No.40525011,40632011)

• 朱静
• 1. 中国科学院地球化学研究所环境地球化学国家重点实验室, 贵阳 550002; 2. 中国科学院研究生院, 北京 100039; 3. 贵州大学化学与化工学院, 贵阳 550003

• 吴丰昌
• 中国环境科学研究院国家环境保护湖泊污染控制重点实验室, 北京 100012

• 摘要：针对锑矿选矿废水中锑和丁基黄原酸钠严重超标的问题,用酸改性粉煤灰对其进行吸附处理.试验结果表明,当改性粉煤灰处理选矿废水的最佳质量体积比(g·mL^-1)为1:100,pH值为3,静置时间为4h时,可以将选矿废水中的锑浓度从28.611mg·L^-1降到0.05mg·L^-1以下,去除率达99.8%以上;废水中的丁基黄原酸钠浓度可从0.373mg·L^-1降到0.02mg·L^-1以下,去除率达95.0%以上.处理废水后的改性粉煤灰用硫酸-硝酸浸提,浸出液中重金属离子浓度均低于国家浸出毒性标准,表明改性粉煤灰是一种很好的锑矿选矿废水处理剂.

• Abstract：The removal of antimony and sodium butyl xanthate from antimony ore wastewater using acidified coal fly ash were investigated under various conditions of dosage,pHand standing time.The results demonstrated that at a dosage of 1∶100 and pH 3,the concentration of antimony decreased from 28.611 mg·L^-1 to 0.05 mg·L^-1 (up to 99.8%) and the concentration of sodium butyl xanthate decreased from 0.373 mg·L^-1 to 0.02 mg·L^-1 (up to 95.0%) over a 4 h period.After use,the acidified coal fly ash was leached with sulphuric and nitric acids and the contents of heavy metals detected in the leaching liquid were below the national standard,indicating a low toxicity of the solid fly ash waste.This result indicates that acidified coal fly ash can be useful as an absorbent to treat wastewater from antimony ore processing.

• Key words：acidified coal fly ash  antimony ore processed wastewater  antimony  sodium butyl xanthate  leaching toxicity

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