四川某难浸金矿的矿石性质研究

A STUDY ON THE PROPERTY OF A REFRACTORY GOLD ORE FROM SICHUAN PROVINCE

四川某金矿是一种难浸金矿,因为矿石中的金被包裹于含铁硫化矿物中,而且含有机炭质物。细菌Hst能有效氧化金矿中的硫化矿物以提高金的浸出率。如果细菌氧化矿石中铁的浸出率大于90%,金几乎完全解离,金的氰化浸出率大于90%。研究表明,该金矿的难浸特性是因为金包裹于含铁硫化矿物中,有机炭质物和粘土矿物对金浸出影响甚微。

The property of a gold ore obtained from Sichuan province is studied. This gold ore represents a unique class of refractory gold ores in general, because not only does gold encapsulation by iron sulfide occur, but this ore also contains organic carbonaceous and clay matter. Bacteria Hst can oxide all sulfide minerals in ore and improve the gold extraction effectively. The degree of gold liberation is mainly depends upon the percentage of pyrite oxidation by Bacteria. If the leaching percentage of iron from ore is in excess of 90%, the gold liberation is almost completely, and the gold extraction can reach 90% or more by cyanidation. The results presented in this study show that the refractory nature of this gold ore was originated in gold fine encapsulated by iron sulfide minerals, but organic carbonaceous and clay matter in ores have not effect on leaching of gold.