熔融氯化法从氰化尾矿中提金提银试验

Sun Yanwen, Yuan Chaoxin, Guo Chihao, Li Dajiang, Li Yibin, Mu Liangzhao
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引用次数: 0

摘要

金冶炼过程中产生的氰化尾矿中含有大量重金属和氰化物,对环境的危害越来越大。为了减少对环境的污染,从氰化尾矿中回收有价金属。本文以氰化尾矿为原料,采用熔融氯化工艺,研究了氯化钙用量、氯化时间、氯化钙添加方式等因素对氯化提金银的影响,探讨了如何降低熔融氯化温度,并在最佳条件下进行了综合实验。结果表明:当氯化温度为1500℃,氯化时间为1 h, CaCl2添加量为7%时,金的挥发率为85.38%,渣中金的含量为1.83 g/t,银的挥发率为77.36%,渣中银的含量为4.12 g/t;当氯化温度为1500℃,加入7%的CaCl2,氯化时间为15 min时,金的挥发率为87.78%,炉渣中金的含量为1.23 g/t,银的挥发率为59.40%,炉渣中银的含量为7.39 g/t;添加5% CaO可改变渣型,使氯化温度降低50~100℃,金、银的挥发速率略有提高,降低渣中金、银含量;分5次加入CaCl2时,金的挥发率提高到95.53%,渣中金的含量降低到0.56g/t,银的挥发率提高到77.80%,渣中银的含量降低到4.04 g/t;分5次加入7%的CaCl2,熔融氯化时间为15 min, CaO用量为5%,熔融氯化温度为1450℃,金挥发率为95.69%,熔渣金含量为0.54 g/t,银挥发率为77.06%,熔渣银含量为4.20 g/t。
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Experiment of Gold and Silver Extraction from Cyanide Tailings by Melting Chlorination
Cyanide tailings produced in gold smelting process contain a large number of heavy metals and cyanides, which are more and more harmful to the environment. In order to reduce environmental pollution, valuable metals from cyanide tailings are recovered. The amount of calcium chloride, chlorination time, the way of adding calcium chloride and other factors on the influence of gold and silver extraction by chlorination were studied by using the raw material of cyanide tailings with melting chlorination process in this paper, and how to reduce the melting chlorination temperature was explored, and a comprehensive experiment was carried out under the best conditions. The results showed that when the chlorination temperature is 1500°C, the chlorination time is 1 h, and the addition amount of CaCl2 is 7%, the volatilization rate of gold is 85.38%, the content of gold in slag is 1.83 g/t, the volatilization rate of silver is 77.36%, and the content of silver in slag is 4.12 g/t; when the chlorination temperature is 1500°C, 7% CaCl2 is added, and the chlorination time is 15 min, the volatilization rate of gold is 87.78%, the content of gold in slag is 1.23 g/t, the volatilization rate of silver is 59.40%, and the content of silver in slag is 7.39 g/t; the addition of 5% CaO can change the slag type, reduce the chlorination temperature by 50~100°C, increase the volatilization rate of gold and silver slightly, and decrease the content of gold and silver in slag; when CaCl2 is added in five times, the volatilization rate of gold increases to 95.53%, the content of gold in slag decreases to 0.56g/t, the volatilization rate of silver increases to 77.80%, and the content of silver in slag decreases to 4.04 g/t; 7% CaCl2 was added in five times, and the melting chlorination time was 15 min. the amount of CaO was 5%, and the melting chlorination temperature was 1450°C, the gold volatilization rate is 95.69%, and the gold content of slag is 0.54 g/t, the silver volatilization rate is 77.06% and the silver content of slag is 4.20 g/t.
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CiteScore
3.50
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0.00%
发文量
6
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