用化学沉淀法处理高铜氰化贫液

Treatment of High Copper-bearing Cyanide Barren Solution by Chemical Precipitation Process

研究了采用硫酸亚铁-硫化钠沉淀工艺处理老挝某矿业有限公司的高铜氰化贫液,考察了硫酸亚铁用量、反应时间、硫化钠用量及沉铜反应时间对氰化贫液中铜去除率的影响。试验结果表明:处理500mL氰化贫液,加入20g FeSO_4·7H_2O,室温下机械搅拌5min,再加入理论量5倍的Na_2S,反应60min,铜去除率达94%以上;沉淀渣中铜质量分数为15%,X射线衍射(XRD)分析结果表明,沉淀渣中的铜主要以Cu(SCN)和Cu_2S形式存在。

The high copper-bearing cyanide barren solution from a mining Co. ,Ltd. in Laos was treated by precipitation process. The effects of ferrous sulfate dosage, reaction time, sodium sulfide dosage and precipitation reaction time on removal rate of copper were examined. The experimental results indicate that 20 g FeSO4 · 7H2O is added to 500 mL cyanide barren solution after stirring for 5min at room temperature, Na2 S dose being is 5 times of theoretical amount and reaction time is 60 min, the removal rate of copper can reach over 94~. After copper being removed, copper and iron in the solution are 0. 145 g/L and 0. 241 g/L,respectively. The X-ray diffraction analysis results illustrate that copper in the precipitation copper residue is mainly in forms of Cu（SCN） and Cu2S.