含镉、锌矿坑水深度处理工艺试验研究及工程应用

针对福建某矿山含镉、锌矿坑水经石灰中和处理后的出水水质不能达到企业的深度处理水质要求,开展工艺优化试验研究及提标升级改造。试验考察了石灰中和、石灰中和—硫化沉淀、混凝—石灰中和法去除镉、锌的效果,并进行工业调试及运行。结果表明,混凝—石灰中和处理工艺综合处理效果较好,外排水中Cd、Zn浓度分别低于0.005、0.1 mg/L,去除率均大于99.40%,吨水处理成本为2.15元,不增加处理成本的同时实现Cd、Zn减排。该方法实现"以废治废",环境效益显著。

Research and application of advanced treatment of cadmium and zinc bearing mine water

According to the current situation that the existing lime neutralization method for cadmium and zinc bearing mine water treatment of a mine in Fujian could not reach the standard, an advanced treatment process was carried out. Lime neutralization, lime neutralization-sulfide precipitation and coagulation-lime neutralization industrial experiments were conducted. The results indicated that the effect of coagulation-lime neutralization treatment was the best, in which only 0.005 mg/L and 0.1 mg/L of cadmium and zinc in the effluent, respectively, both of the removal rate was up to 99.40% and cost of 2.15 yuan per ton, The results show that the effect of coagulation lime neutralization treatment is better. The concentration of Cd and Zn in external drainage is less than 0.005 mg/L and 0.1 mg/L respectively, the removal rate is more than 99.40%, and the cost of tonnes water treatment is 2.15 yuan, and the reduction of Cd and Zn can be realized without increasing the treatment cost. This new process uses two kinds of waste water deal with each other containing good economic and environmental benefits.