高银铜铁钙载金炭高温高压解吸电解试验与实践

针对原矿成分复杂,全泥氰化炭浆工艺吸附后载金炭泥质重,银、铜、钙、铁等杂质品位高,高温高压解吸电解载金炭生产中解吸电解循环管道易结垢堵塞,金、银解吸率偏低,解吸时间长,金泥难冶炼等问题,进行了解吸电解工艺试验研究与生产实践。结果表明:在高铜、铁、钙载金炭高温高压解吸电解生产过程中,采用氢氧化钠质量分数2%,氰化钠质量分数0.25%,除垢剂0.2%的组合解吸药剂配液制度,解吸电解温度控制:一段125℃恒温5h,最高温度控制155℃,解吸流量控制在2.25倍炭床体积,贫炭酸洗率控制80%,可解决解吸管道易堵塞难题,解吸电解流量得到稳定保障,管道筛网拆换频次由原来的一天一拆换提高到15天一拆换;金解吸率由83.83%提高到87.15%,银解吸率由95.41%提高到98.37%;解吸电解时间由每柱19.15h缩短至16.67h。加快氰化金银吸附速率,氰化尾槽金银浓度实现科学控制,提升金、银综合回收率。

Experiment and Practice of High Temperature and High Pressure Desorption Electrolysis of High Ag-Cu-Fe-Ca-bearing Gold Loaded Carbon

To address complex composition of raw ore,heavy quality of gold loaded carbon slime,high grade of impurities such as silver,copper,calcium,iron,etc.after adsorption of all-slime cyaniding carbon slurry process,scaling and blocking of desorption electrolytic circulation pipeline during production of high temperature and high pressure desorption electrolytic gold loaded carbon,low desorption rate of gold and silver,long desorption time,and difficult smelting of gold slime,experimental research and production practice of absorption electrolytic process were carried out.The results show that during high temperature and high pressure desorption electrolysis of high copper-iron-calcium-bearing gold loaded carbon,blocking of pipeline is solved and flow of desorption electrolysis is stable and guaranteed,frequency of disassembly and replacement of pipeline screen rises from one day to 15-day,desorption rate of gold and silver rise from 83.83%and 95.41%to 87.15%and 98.37%respectively,and desorption time for per column drops from 19.15 h to 16.67 h under the conditions including desorption agent consist of 2%sodium hydroxide,0.25%sodium cyanide and 0.2%disincrustant,desorption electrolysis temperature to be controlled at 125℃ for 5 h,the maximum temperature to be controlled at 155℃,desorption flow of 2.25 times of volume of carbon bed,and acid cleaning rate of lean carbon of 80%.Adsorption rate of gold and silver is accelerated and comprehensive recovery of gold and silver is improved.Concentration of gold and silver in cyanidation tailing tank can be controlled scientifically.