摘要:
通过浮选试验研究了西藏某铜钼混合精矿的分选条件,同时借助人工配置的模拟回水和不同配比的选矿回水试验考察了回水对铜钼混合精矿分离浮选的影响.浮选条件试验结果表明:在矿浆pH值为7.68条件下,固定Na2S用量为5000g/t,煤油用量为100g/t,经过一步粗选,得到的钼精矿中钼品位为11.52%,回收率为61.61%;铜品位为24.63%,回收率为10.77%.人工配置的模拟回水试验结果表明:铜钼分离各因素显著性顺序为铜离子浓度、黄药浓度、硫离子浓度.配比使用选厂回水试验结果表明:配比使用选厂回水时,当回水配比≤60%时,有利于提高铜钼分离指标;当回水配比>60%时,不利于铜钼的分离.现场选矿回水的循环回用试验结果表明选矿回水会降低钼精矿中钼的回收率,影响铜钼混合精矿的分离.
关键词:
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选矿回水
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铜精矿
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钼精矿
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分离浮选
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黄药
Abstract:
The flotation separation conditions of a Cu-Mu bulk concentrate in Tibet were studied by flotation tests.Meanwhile, the effect of backwater on flotation separation of Cu-Mu bulk concentrate was investigated by flotation tests using artificial configured backwater and beneficiation backwater.The results of flotation conditions tests showed that the optimal dosages of Na2S and kerosene were 5 000 g/t and 100 g/t at pH 7.68.Under these conditions, a molybdenum concentrate was obtained with Mo grade of 11.52%, Mo recovery of 61.61%, Cu grade of 24.63% and Cu recovery of 10.77% by one-step rougher flotation.The results of the artificial configured backwater indicated that the significant influence order of Cu-Mu separation was copper ions concentration, xanthate concentration and sulfur ions concentration.The results of ratio test using beneficiation backwater demonstrated that it was helpful to improve the separation index when the ratio of backwater was less than 60%;while the ratio of backwater was more than 60%, the separation index was deteriorated.The results of practical tests in dressing plant indicated that beneficiation backwater decreased the Mo recovery in concentrate and affected the separation of copper and molybdenum.
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