氧压浸金过程的基础研究

A process of gold leaching with reaction products from elemental sulfur in alkaline solutions under oxygen pressures was proposed and investigated. The reaction chemistry, formation mechanism and conditions of the reagent complexed with gold ions in the process were studded through tests. A series of experiments. The effect of the initial molar ratio of S0 and OH-, the final pH in leachates, the consumption of oxygen, the reaction temperature, the leaching time and the other factors on the kinetics of gold leaching in the process were confirmed thorough a series of experiments. Based on the results of fundamental studies, a technology for gold leaching with elemental sulfur in alkaline solutions under oxygen pressure was proposed. The optimized operation conditions for the technology were found out from experimental results of a gold sulfide concentrate and a residue from an arsenic refractory gold concentrate by pre-treating with a low concentrate HNO3 solution under oxygen pressures. It is shown that the leached gold was similar, and the leaching time was obviously shorted for the technology in comparing with cyanidation. The results from the residue leaching with this technology show some excellences over the cyanide leaching, for example, more higher leached yield and non needed to add a complexed reagent for gold extraction.

在ｐＨ５－９及元素硫存在下，利用元素硫在氧压条件下的氧化产物从含硫金物料或金矿中浸金，研究浸出过程中元硫氧化的反应历程和溶液化学，各中间产物的生成和存在的稳态条件以及金的浸取反应机理，考察浸金过程主要因素影响及其动力学规律，确定过程优化工艺条件，为发展一种高效，经济，清洁的新浸金过程奠定基础。