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由美国矿务局研究的铜-催化的硫代硫酸盐浸出,对低品位氧化金矿的堆浸或地浸而言,可能是一种经济的和环境上安全的方法。从部分因素的筛选试验中,研究了六种参数,这六种参数包括:硫代硫酸盐(S_2O_3~(2-))、亚硫酸盐(SO_3~(2-))、铜(Cu~(2+))和氨(如NH_4OH)等的浓度,空气/惰性气氛,以及浸出时间对金浸出率的影响,和铜影响硫代硫酸盐的消耗量。在试验的实验范围内,氨浓度和浸出气氛没有明显的影响。为了获得高的金浸出率和低的硫代硫酸盐消耗,使用了面心立方体(FCC)表面敏感度实验中的部分因素筛选试验的数据来决定最佳浸出条件。为了预测在试验范围内金的浸出率和硫代硫酸盐的消耗量,从这些数据得到了两个方程式。这两个方程式预测在0.2MS_2O_3~(2-),0.00625MSO_3~(2-),0.001MCu~(2+),0.09MNH_4OH和浸出48h的条件下,获得90％金的浸出率和每吨矿石消耗0.2kgS_2O_3~(2-)。这些试验结果与使用标准氰化法浸出24h获得86％金浸出率和每吨矿石消耗0.21KgCN~-相比是有利的。
Cu-catalyzed thiosulfate leaching, as studied by the U.S. Bureau of Mines, may be an economical and environmentally safe method for heap leaching or sub-leaching of low-grade oxidized gold. Six parameters were studied from the screening experiments of partial factors, including six kinds of parameters: thiosulfate (S_2O_3 ~ (2-)), sulfite (SO_3 ~ (2-)), copper 2+)) and ammonia (such as NH 4 OH), air / inert atmosphere, and leaching time on gold leaching rate, and copper affects thiosulfate consumption. Within the experimental range of the experiment, ammonia concentration and leaching atmosphere had no significant effect. To obtain high gold leaching rates and low thiosulfate consumption, data from a fractional factorial screening test in face-to-face cubic (FCC) surface sensitivity experiments were used to determine the optimal leaching conditions. To predict the gold leaching rate and thiosulfate consumption over the experimental range, two equations were derived from these data. These two equations predict the leaching rate of 90% gold and per ton of ore under the conditions of 0.2MS_2O_ (2), 0.00625MSO_3 ~ (2 -), 0.001MCu ~ (2 +), 0.09MNH_4OH and leaching time of 48h Consumption of 0.2kgS_2O_3 ~ (2-). These test results are advantageous compared to the 86% gold leach rate achieved with a standard cyanide leach solution of 24 h and 0.21 KgCN-1 per ton ore consumption.