( 1. 北京科技大学 土木与环境工程学院，北京 100083；
2. 江西理工大学 环境与建筑学院， 赣州 341000；
3. 福建紫金矿业集团股份有限公司， 上杭 364200)
摘 要: 含铜金矿在氧气分压为0.45 MPa、 温度约为110 ℃条件下于高压釜中氧化一定时间， 浸出铜后，渣氰化浸金， 获得的铜、 金浸出率分别为90.3%和96.55%。通过分析X射线衍射谱及CuFeS2-H2SO4-NaCl-H2O体系在25 ℃下的φ-pH图， 确定了载金矿物的氧化机理， 分析了浸出体系的酸度、 温度及氯化钠浓度对含铜金矿预氧化及浸出过程的影响规律。 结果表明：硫化矿的氧化溶解首先是磁黄铁矿， 其次是铜的次生硫化矿， 再次是黄铜矿， 最后是黄铁矿； 载金黄铜矿的氧化首先是铁从黄铜矿的晶格中氧化溶解出来， 生成中间产物CuS2和CuS； 较高的酸度和氯化钠浓度有利于单质硫的生成、三价铁的水解和铜的浸出， 进而有利于金浸出率的提高。
关键字: 含铜金矿； 压力氧化； 浸出
copper-bearing gold ores
（ 1. School of Civil and Environmental Engineering,
University of Science and Technology Beijing， Beijing 100083， China；
2. School of Environmental and Architectural Engineering,
Jiangxi University of Science and Technology， Ganzhou 341000， China；
3. Fujiian Zijin Mining Industry Co. Ltd.， Shanghang 364200， China）
Abstract: The copper-bearing gold ores were extracted from copper-leaching residues under the conditions of the partial oxygen pressure of 0.45 MPa and the temperature of 110 ℃ oxidated for some time in the autoclave. The results show that the extraction rate of gold is 96.55% and the rate of copper extraction is 90.3%. By XRD patterns and φ-pH diagram of CuFeS2-H2SO4-NaCl-H2O system at 298 K under pressure of 101.325 kPa, the oxidizing process and mechanism of the gold mineral were identified. The effects, such as the acidity of leaching system, the temperature and the concentration of the sodium chloride, on oxidation and leaching of copper-bearing gold ores were analyzed. The results show that the sequence of sulfide ores oxidized and dissolved are pyrrhotite firstly, sulphide secondly, then chalcopyrite, pyrite lastly. The high acidity and concentration of the sodium chloride are propitious to produce sulphur, hydrolyse of Fe3+ and leaching of copper, and furthermore, the rate of gold extraction can be improved dramatically.
Key words: copper-bearing gold ore; pressure oxidation;leaching
