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氰化过程中溶解的金可以通过锌粉置换 (Merrill-Crow法 )或活性炭吸附来回收。这些技术已在工业中应用。吸附在活性炭上的贵金属 (Au和Ag)可以通过各种技术在随后的水相作业中进行提取 ,例如 :用水和醇溶液热提洗 (70～ 80℃ )或压力解吸 (10 0～ 180℃ )。由于这一段的能耗高 ,所以从经济上考虑 ,人们对这一步是很关注的。温度是关键的洗提动力学因素。本论文主要研究了水与不同有机物溶剂混合物 (异丙醇、乙醇和乙二醇 )对吸附过程的影响。试验工作在实验室中进行。本试验是在未加氰化物的条件下 ,在不同温度和解吸时间下用有机物溶剂混合物解吸椰壳活性炭上的金。得到的最好试验结果的顺序为 :异丙醇 >乙二醇 >乙醇。含金量约为 5g/kg的载金炭在温度 80℃时 ,在最佳的动力学条件下解吸 8h后 ,金的提取率为 97%～ 10 0 %。
The dissolved gold during cyanidation can be recovered by zinc-powder displacement (Merrill-Crow method) or activated carbon adsorption. These technologies have been applied in industry. The noble metals (Au and Ag) adsorbed on the activated carbon can be extracted in subsequent aqueous operations by various techniques, for example, thermal stripping (70-80 ° C) with water and alcohol solution or pressure desorption ). Due to the high energy consumption in this section, it is economically important that people are very much concerned with this step. Temperature is a key elution kinetic factor. In this thesis, the effects of water and different organic solvent mixtures (isopropanol, ethanol and ethylene glycol) on the adsorption process were studied. Test work in the laboratory. In this experiment, the gold on coconut shell activated charcoal was desorbed from the mixture of organic solvents at different temperatures and desorption times without added cyanide. The best test results obtained are in the order of isopropanol> ethylene glycol> ethanol. The gold extraction rate was 97% ~ 100% after desorption for 8h under the optimal kinetic conditions at a temperature of 80 ℃.