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通过模拟铅锌尾矿环境中酸性矿山废水、选矿废水(含乙基黄药)连续淋溶铅锌尾矿试验,研究渗滤液和脉石颗粒变化,并以此分析自然中和与沉淀吸附金属的地球化学过程,对淋溶后矿物颗粒表面进行表征。结果表明,当铁离子、铅离子和镉离子含量分别为200、20、5mg/L的酸性淋溶液与乙基黄药浓度为100mg/L的选矿废水经过淋溶柱后,由于碳酸盐的自中和特性,渗滤液的pH为7～8;渗滤液中镉、铅离子含量均小于0.05mg/L,并且渗滤液中乙基黄药的去除率为99%以上。矿物颗粒表征结果表明,乙基黄药没有影响铁矿物的形成,脉石颗粒表面覆盖了Ca(OH)2、CaSO4亲水性钙膜和铁矿物,并且铁矿物会吸附铅离子和镉离子。
Abstract：Changes of leachate and gangue particles were studied to analyze geochemical processes of natural neutralization and precipitation of adsorbed metals through simulating continuous leaching of lead-zinc tailings with acid mine wastewater and ethylxanthate-bearing beneficiation wastewater.Surfaces of mineral particles after leaching were characterized.The results show that when acidic leaching solution with iron,lead and cadmium ion content of 200,20,and 5 mg/L respectively,and beneficiation wastewater with ethyl xanthate concentration of 100 mg/L pass the leaching column,pH of leachate is 7～8 due to selfneutralization characteristics of carbonate,content of cadmium and lead ions in leachate is less than0.05 mg/L,and removal rate of ethyl xanthate in leachate is 99% above.The results of mineral particle characterization show that ethyl xanthate does not affect formation of iron minerals.Surface of gangue particles are covered by Ca(OH)2,CaSO4 hydrophilic calcium film and iron minerals,and iron minerals adsorb lead and cadmium ions.
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基本信息:
中图分类号:X753
引用信息:
[1]蒋莉蓉,曹长春,蔡维炯.酸性矿山废水与含黄药选矿废水淋溶铅锌尾矿试验[J].有色金属(冶炼部分),2020(01):84-90.
基金信息:
广西科技计划重大专项(桂科重14124001-4); 广西环境污染控制理论与技术重点实验室项目(H2015123111)
2020-01-12
2020-01-12