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对以黄铜矿形态出现的含铜为 0 4 %的细磨单体解离金矿石 ,可以用氰化法处理。在预浸中 ,可溶性硫化物的氧化动力学的反应历程不能精确的表述。只有在充氧使用硝酸铅和高浓度的游离氰化物的特定的条件下 ,可使金有效的浸出 ,添加硝酸铅可以提高金浸出率。但在金浸出率不下降的情况下 ,氰化物的消耗不能减至 1 85kg/t以下。在不添加硝酸铅的情况下 ,金的回收率要低于 90 % ,而添加硝酸铅金的回收率可达到 98% ,充氧可使金的回收率增加 1 5% ,而当硝酸铅的添加量高于 3 0 0 g/t时 ,金的浸出率无明显变化 ,可用氧化还原电位值作为控制氰化过程的不同阶段硝酸铅添加量 ,以示系统的状态。提高硝酸铅的浓度抑制黄铜矿的溶解 ,但使用的结果并不能降低氰化物的消耗。在溶液中铜的含量高 ,需要NaCN的浓度在 70 0mg/l的范围内 ,当NaCN的平均浓度低于 64 0mg/l时 ,金的回收率明显下降。还发现氰化一开始便直接添加硝酸铅 ,金的浸出率与预浸添加时相同。
To the chalcopyrite morphology of copper containing 0 4% finely ground monomer dissociated gold ore, cyanide treatment can be used. In prepregs, the reaction kinetics of soluble sulfide oxidation can not be accurately characterized. Gold can be effectively leached only under the specific conditions of oxygenation using lead nitrate and high levels of free cyanide, and the addition of lead nitrate increases the gold leaching rate. However, in the case of gold leaching rate does not decline, cyanide consumption can not be reduced to less than 1 85kg / t. In the absence of lead nitrate, the recovery of gold is less than 90%, while the recovery of lead nitrate gold can reach 98%, oxygen recovery can increase gold recovery by 15%, while when the lead nitrate When the added amount is higher than 300 g / t, the leaching rate of gold has no obvious change. The value of redox potential can be used as the control of the amount of lead nitrate in different stages of cyanidation to show the state of the system. Increasing the concentration of lead nitrate inhibits the dissolution of chalcopyrite, but the results used do not reduce cyanide consumption. The high copper content in the solution requires a concentration of NaCN in the range of 70 0 mg / l, and a significant decrease in gold recovery when the average NaCN concentration is less than 64 0 mg / l. It was also found that lead cyanide was added directly from the very beginning, with the same gold leaching rate as when prepreg was added.