摘要
青海昆仑黄金有限公司浸出介质中SCN-浓度高达10225.9 mg/L,Cu^(+)浓度为4131mg/L,采用酸化法处理,Cu^(+)几乎全部以CuSCN形式沉淀,贫液中铁离子浓度为4451 mg/L,锌离子浓度为2895 mg/L,铅离子浓度为2.82 mg/L,不足以将铁氰络合物沉淀,因此,浸出介质中铁离子浓度较高,给浸出和置换作业带来了不利影响。为解决该问题,开展了向贫液添加硫酸锌试验。结果表明,向酸化阶段的贫液中添加硫酸锌可明显降低铁离子浓度;通过异步沉淀,可实现铜、锌的分类回收;贫液除铁后,置换阶段锌粉用量由102.5 g/m^(3)降至86.01 g/m^(3),金泥铁品位由5.2%降至4.3%,金浸出率提高0.2个百分点,银浸出率提高1.02个百分点,达到了改善浸出介质质量的目的。
The concentration of SCN-in the leaching medium is as high as 10225.9 mg/L,and Cu^(+)concentration is 4131 mg/L in Qinghai Kunlun Gold Co.,Ltd.Cu^(+)is almost precipitated in the form of CuSCN with the acidification process.The concentration of iron,zinc,lead ions in barren liquor are 4451mg/L,2895 mg/L,2.82 mg/L,respectively,which is not enough to precipitate the iron cyanide complex.Therefore,higher iron ion concentration in the leaching medium will bring adverse effects to the leaching and replacement process.In order to solve the problem,the experiment of adding zinc sulfate to barren liquor was carried out.The results showed that adding zinc sulfate to the barren liquor in acidification stage can obviously reduce the concentration of iron ion.Copper and zinc can be collected separately through asynchronous precipitation.While iron is removed from barren liquor,the dosage of zinc powder in replacement process decreases from 102.5 g/m^(3)to 86.01 g/m^(3),the iron grade in gold mud decreases from 5.2%to4.3%,the gold leaching rate increases by 0.2 percentage points,and the silver leaching rate increased by1.02 percentage points,achieving the purpose of improving the quality of the leaching medium.
作者
秦贞军
陈光辉
牛桂强
石宝兴
王虎
程雨波
李宁
QIN Zhenjun;CHEN Guanghui;NIU Guiqiang;SHI Baoxing;WANG Hu;CHENG Yubo;LI Ning(Qinghai Kunlun Gold Co.,Ltd.)
出处
《现代矿业》
CAS
2023年第2期223-225,234,共4页
Modern Mining
关键词
贫液
铁氰络合物
硫酸锌
沉淀
barren liquor
iron cyanide complex
zinc sulfate
precipitation
