贵州省兴义市雄武地区金矿石堆浸的工艺研究

The Heap Leaching Process of the Gold Ores in the Xiongwu Area,Xingyi City,Guizhou Province

贵州省兴义市雄武地区金矿主要为卡林型，其次为红土型，矿床受断裂构造控制，矿石为中等含硫微细浸染状氧化矿石。目前浅部矿石已基本采完，深部矿石品位较低（0．8～1．8g／t），因此有效提高低品位矿石浸出率和金回收率至关重要。研究表明，筑堆时矿石粒度和喷淋时氰化钠浓度是堆浸生产中的重要影响因素。矿石粒度大，金浸出率低；氰化钠浓度大，则成本增加。根据矿石物质成分和工艺特征研究，得到矿石冶炼时的最佳工艺条件：筑堆时矿石粒度为15～25mm，氰化钠浓度为0．05％～0．08％。该研究有效提高了矿石浸出率，降低了运营成本，为金矿石堆浸实际生产提供了理论和实验依据。

The gold deposits occurred in fractures in the Xiongwu area, Xingyi are mainly Carlin-type and secondly laterite type. Their ores are mainly oxidized micron-sized disseminated ores containing a certain amount of sulfur. At present, the gold ores at shallow level in the area are mostly mined out. The grade of ores in deep part is quite low （0.8-1.8g/t）. Therefore, it is very important to improve the leaching efficiency and recovery of gold from the low-grade ores. The ore process study results indicate that the grain size of ores and the concentration of sodium cyanide of solutions for the heap leaching process are key factors controlling the leaching efficiency and recovery of gold. Generally, the gold leaching efficiency is decreased when the grain size of ores is increased, and the operation cost is increased when the concentration of sodium cyanide in leaching solution is high. On the basis of the characteristics of ore compositions and the processing technique, through the relative tests and production practices, the gold ores in the area should be processed under the optimal condition of 15-25mm sized ores and the 0. 05% 0. 08% sodium cyanide solution. This study has provided theoretical and experimental evidences for improving the leaching efficiency of ores and reducing the operation cost in the practice of heap leaching process.