根据配合物离子积理论，控制氰化液中的游离氰根浓度，可以将铜离子调整为不易被活性炭吸附的形态，实现含铜氰化液中金的恒择性吸附。据此对福建某金矿的含铜氰化液进行了恒择性吸附研究，条件实验和工业试验的结果表明，当调整氰化液中总铜浓度小于200 mg/L、pH值为10.0~11.0，游离氰根浓度不大于150 mg/L时，金的吸附率提高到90%以上，载金炭铜含量降到5 kg/t以下，可实现活性炭从氰化液中恒择性吸金抑铜。
On the basis of theoretical analysis, by the control of free cyanide concentration in the cyanide solution, copper ions could be adjusted to the form which is difficultly absorbed by activated carbon, and then to realize gold-selective adsorption by activated carbon. Therefore, selective adsorption from copper-containing cyanide solution of a gold mine in Fujian was studied. The experimental results show that, when the total copper concentration in cyanide solution is less than 200 mg/L, pH =10.0~11.0, and free cyanide concentration is less than 150 mg/L, the adsorption rate of gold can be increased to more than 90%. Under these conditions, copper content in gold-loaded carbon can be reduced to less than 5 kg/t. The technology can realize gold-selective adsorption by activated carbon from cyanide solution.
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