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本文根据加拿大夏洛提湖(Charlotte Lake)矿和弗雷斯特山(Forest Hill)矿的浮选、直接氰化和浮选-氰化-炭吸附流程的试验结果,探讨从老重选尾矿中回收金技术上的可行性和经济上的合理性,并拟定了该类矿石的工业利用流程。试验结果证明:所用的三种工艺流程在技术方面均是可行的。根据美国的生产实践,处理含金2克/吨以上的矿石,经济上也是合理的,至少用堆浸法不成问题。经比较后,笔者推荐浮选-氰化-炭吸附(小厂可用锌沉淀)流程(图8)为该类矿石的提金流程。据记载,世界上生产黄金的历史有五千年左右了。古代的生产方法一直沿用重选法和混汞法,直至十九世纪末叶氰化浸出和浮选法问世。尽管如此,重选法仍具有工艺简单、成本低廉、易于操作等优点。但是在古代,由于生产工艺和设备落后,加上重选本身的局限性,致使大量的金损失在尾矿中。这样,几乎世界上的所有金生产国都有古代遗留下来大量的含金尾矿堆和尾矿池。根据加拿大新斯科舍(Nova-Scotia)省的调查,该地区的尾矿含金量介于2—20克/吨。
Based on the results of the flotation, direct cyanidation and flotation-cyanidation-charcoal adsorption processes of the Charlotte Lake and Forest Hill mines in Canada, Mine recovery gold technical feasibility and economic rationality, and developed the industrial use of ore ores. The test results show that: the three processes used are technically feasible. According to the U.S. production practices, it is also economically reasonable to process ores containing 2 g / t gold or more, at least by heap leaching. After comparison, I recommend flotation - cyanide - carbon adsorption (zinc available for small plant precipitation) process (Figure 8) for the type of ore extraction process. According to records, the history of gold production in the world is about 5,000 years. Ancient methods of production have been followed by re-election and amalgamation until the late nineteenth century cyanide leaching and flotation method came out. In spite of this, the reselection method still has the advantages of simple process, low cost and easy operation. However, in ancient times, due to the backward production technology and equipment, coupled with the limitations of reselection itself, a large amount of gold was lost in the tailings. In this way, almost all of the gold-producing countries in the world have large amounts of gold-bearing tailings pits and tailings ponds left over from ancient times. According to a survey in the province of Nova Scotia, tailings have been found in the region with gold content of 2-20 g / t.