摘要：采用化学沉淀法处理含镍废水, 以硫化钠为沉淀剂, 将废水中的镍离子以某种含镍沉淀的形式析出, 从而达到净化废水的目的, 考察硫化钠的投加量、反应速率、搅拌时间和pH值对废水中镍离子的去除率的影响。结果表明, 在pH=6.0, 硫化钠投加质量为4.0 g, 即为理论值的1.1倍时, 以30 r/min的转速搅拌反应30 min的条件下, 模拟含镍废水的处理效果最佳, 去除率达到95.2%, 所得的沉淀物经X射线衍射仪检测显示为氢氧化镍沉淀, 中间过程生成的硫化氢气体可继续对废水进行处理。

关键词：硫化钠；含镍废水；含镍沉淀

Abstract：Sodium sulfide was used in the precipitation treatment of nickel wastewater. The effects of chemicals dosage, reaction time and p H value on the removal rate of the nickel ions in the wastewater were investigated. The results show that the excess ratio of Na₂S is 1.1, with stiring 30 min at a rate of about30 r/min, the removal rate of nickel is 95.2%, XRD analysis showes a dense nickel hydroxide precipitate. The hydrogen sulfide produced during the process can be used to treat the wastewater.

Keywords: sodium sulfide；nickel wastewater；nickel precipitation