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本文叙述了用氰化法从Paredes(位于葡萄牙东北部)的毒砂矿石中提取金和银的最佳条件。为了确定最佳工艺流程,无论这种方法是否需要预先焙烧矿石,研究工作都应该做到:(1)最大限度地减少各种单元操作的数目;(2)要能够选择性地提取金和银;(3)为了消除污染,要能够确定一个简单的液流闭路循环流程。本研究工作所推荐的流程,是将矿石破碎到36um以下,在固液比1:4、2g/1 KCN条件下,对不经预先焙烧的矿石进行氰化处理。可溶解出92％的金,55％的银和65％的铜,然后用活性炭从溶液中吸附回收金和银。
This article describes the optimal conditions for the extraction of gold and silver from the arsenopyrite ore from Paredes (northeastern Portugal) by cyanidation. In order to determine the optimal process, whether or not this method requires the pre-roasting of ores, research work should be done to: (1) minimize the number of various unit operations; and (2) to be able to selectively extract gold and silver ; (3) In order to eliminate the pollution, it is necessary to be able to determine a simple closed flow circulation process. The procedure recommended in this work is to crush the ore to less than 36 μm and cyanidize ore that has not been pre-roasted at a solid-to-liquid ratio of 1: 4 and 2 g / 1 KCN. 92% gold, 55% silver and 65% copper can be dissolved, and gold and silver are recovered by adsorption from the solution with activated carbon.