电位调控-硫化沉淀联合技术沉淀锌的实验研究

Experimental study on zinc precipitation by potential regulation-sulfide precipitation

摘要: 采用电位调控-硫化沉淀法对含Zn²⁺ 100 mg/L的矿山酸性废水进行深度处理.结果表明，采用10 %石灰乳液为中和药剂预先除铁，其用量为7.5~14 mL/L，沉铁时间为30 min，铁的去除率可以达到80 %以上；除铁后的溶液采用硫化法沉淀锌，以NaHS为硫化剂，pH值为3.4，PAM用量为1 mL/L，氧化还原电位控制在6~76 mV时，矿山酸性废水中的Zn²⁺的去除率达到96.85 %以上.

Abstract: Potential regulation-sulfide precipitation are used to treat zinc-containing mine acid drainage with the concentration of 100mg/L deeply. When 10 % CaO is selected as a neutralizing agent to remove iron, (the amount of 10 % CaO 7.5~14 ml/L, precipitation time of iron 30 min), the removal rate of iron could reach above 80 %. Vulcanization is performed on the de-ironed solution to precipitate zinc using NaHS as the vulcanizing agent, (with the sulfide precipitation zinc pH value of 3.4, the dosing quantity of PAM flocculant of 1 mL/L, and ORP of at 6~76 mV), the removal rate of zinc ions in acid drainage can be over 96.85 %.