通过气-液硫化反应初步分离污酸废水中的铜和砷,并将一级铜、砷分离渣按一定比例加入污酸原液中实现溶液中铜和渣中砷的置换分离.考察反应时间、温度和H2S用量对铜、砷去除率的影响,同时考察固液比、时间和温度对铜、砷置换反应的影响.当在50℃ 时加入20 mmol/L的H2S时,在0.5 min时间内即可使铜的去除率达到80%以上,且砷的去除率约为20%.将铜、砷一级分离渣按照10%以上的固液比例加入污酸废水中,在20℃ 下10 min后由于铜、砷置换作用,废酸中铜和砷分离率达到99%以上.沉渣中主要物相为CuS,富集的铜渣中铜的质量分数为63.38%.
Copper and arsenic in acidic wastewater were separated by cascade sulfidation followed by replacement of arsenic in the precipitates by copper in the solution which was realized by recycling precipitates obtained in the first stage into the initial solution. The effects of reaction time, temperature and H2S dosage on copper and arsenic removal efficiencies as well as the effects of solid-to-liquid ratio, time and temperature on the replacement of arsenic by copper were investigated. With 20 mmol/L H2S at 50 ℃ within 0.5 min, more than 80% copper and nearly 20% arsenic were precipitated. The separation efficiencies of copper and arsenic were higher than 99% by the replacement reaction between arsenic and copper ions when solid-to-liquid ratio was more than 10% at 20 ℃ within 10 min. CuS was the main phases in precipitate in which copper content was 63.38% in mass fraction.
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