铀矿山高锰矿井水处理试验研究

Experimental study on treatment of Uranium Mine wasterwater with high manganese

针对某铀矿矿井水高锰含量的特点，先采用曝气锰砂过滤法去除矿井水中的锰，后用201×7阴离子交换树脂吸附矿井水中铀的处理工艺。研究了氧化剂选择，氧化剂加入量，滤液中锰和氯质量浓度，氯根对树脂吸附低浓度铀性能的影响。结果表明：采用NaCl0作为氧化剂，用量为0．05％（氧化剂用量与井水质量比），曝气30min，采用2段锰砂过滤，除锰效果良好，锰去除率达99％，出水锰质量浓度小于0．5mg／L，铀质量浓度小于0．1mg／L；引入的氯根未见对树脂吸附铀造成不利影响，并且保证滤液中锰和氯根低于国家排放标准；锰砂滤床反冲需要4～5倍体积清水可达到反冲效果。该方法操作简单，易实现工业化。

Aimed at the characteristics manganese, the removal of manganese of one uranium mine wastewater with high concentration of and uranium from mine wastewater by the aeration-manganese sand filter process and 201 × 7 ion exchange resin adsorption process was carried out. The influence of several variable factors on the removal rate of manganese and uranium are included selection of oxidi- zing-agent, adding amount of oxidant, concentration of manganese and chlorine in the filter liquor. The effect of low concentration chlorine on the resin adsorption of uranium and backwashing water volume of manganese sand bed was investigated in detail. The results show that manganese removal efficiency is good when the adding amount of NaC10 as an oxidizing agent is 0.05% and aeration time is 0.5 h, with two-stage filtration of manganese sand, and the removal rate of manganese is up to 99%, the effluent manganese concentration is below 0. 5 mg/L and uranium concentration is below 0. 1 mg/L. The chlorine introduced by NaC10 has on effect on uranium adsorption with 201 × 7 resin and the two indexs can meet the standard of national emission. Backwashing of manganese sand has better effect with 4-5 times manganese sand bed volume water. It is simple to operation and easy to industrialization.