某矿山含氰废水因科处理工艺实验研究

Experimental study on the treatment of cyanide-containing wastewater by the Inco process

某矿山目前需对氰化尾渣进行无害化处理,处理后尾渣达到Ⅱ类固体废弃物排放标准。在探索所有废水处理工艺后确定仅沉淀法和氧化法两类工艺可将废水中总氰降至较低浓度,可以满足含氰废水脱氰处理的技术要求。针对因科工艺在实际应用中可能存在的问题进行了系统的条件试验,考察pH值、通气量、药剂用量、反应时间等因素对处理效果的影响。实验结果表明采用铜盐沉淀﹣因科工艺最佳药剂制度为焦亚硫酸钠用量14kg/m^3,五水硫酸铜约为0.2kg/m^3,开路实验处理后含氰废水总氰含量可达30ppm以下。

A mine needs to be harmlessly treated with cyanide tailings.After treatment,the tailings meet the discharge standards for Class II solid waste.After exploring all the wastewater treatment processes,it is determined that only the precipitation method and the oxidation method can reduce the total cyanide in the wastewater to a lower concentration,which can meet the technical requirements for the cyanide treatment of the cyanide-containing wastewater.A systematic condition test was carried out for the problems of copper salt precipitation+inferior process in practical application,and the effects of pH,aeration,dosage,reaction time and other factors on the treatment effect were investigated.The experimental results show that the best chemical system for the use of copper salt precipitation-Inco process is 14 kg/m^3 of sodium metabisulfite and 0.2 kg/m^3 of copper sulfate pentahydrate.The total cyanide content of cyanide-containing wastewater can be less than 30 ppm after open circuit treatment.