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本文以美国某些企业为例,对从贫矿石中堆浸有价金属(金、银、铀)的问题进行了简要地探讨。美国用堆浸法处理矿石量,1979年为矿山开采工业处理总量的10%;1982年这种处理量增长到20%。堆浸的特点是劳动消耗量低,其中主要的劳动消耗是粉碎物料和建造堆物的基础。用堆浸处理的矿石应符合下列要求;金粒应当是极小;金和银溶解于氰化物之中;围岩对氰化物溶液具有渗透性;含有少量的粘土物质;含有少量的导致碱要求高的酸性化合物。周围介质的温度也有一定的影响,因为金和银溶解过程在10℃以下速度减缓;当温度在
Taking some American enterprises as an example, this paper briefly discusses the heap leaching of valuable metals (gold, silver and uranium) from lean ore. The United States used heap leaching for ore processing, which was 10% of the total mined area in the mining industry in 1979; in 1982 it increased to 20%. Heap leaching is characterized by low labor consumption, where the major labor cost is the basis for crushing material and building stockpile. The heap leached ore should meet the following requirements; the gold pellet should be extremely small; gold and silver dissolved in the cyanide; the rock mass is permeable to the cyanide solution; contain a small amount of clay material; High acidic compounds. The temperature of the surrounding medium also has a certain impact, because the dissolution process of gold and silver slows down below 10 ℃; when the temperature at