( 1. 北京科技大學(xué) 土木與環(huán)境工程學(xué)院，北京 100083；
2. 江西理工大學(xué) 環(huán)境與建筑學(xué)院， 贛州 341000；
3. 福建紫金礦業(yè)集團(tuán)股份有限公司， 上杭 364200)
摘 要: 含銅金礦在氧氣分壓為0.45 MPa、 溫度約為110 ℃條件下于高壓釜中氧化一定時(shí)間， 浸出銅后，渣氰化浸金， 獲得的銅、 金浸出率分別為90.3%和96.55%。通過分析X射線衍射譜及CuFeS2-H2SO4-NaCl-H2O體系在25 ℃下的φ-pH圖， 確定了載金礦物的氧化機(jī)理， 分析了浸出體系的酸度、 溫度及氯化鈉濃度對(duì)含銅金礦預(yù)氧化及浸出過程的影響規(guī)律。 結(jié)果表明：硫化礦的氧化溶解首先是磁黃鐵礦， 其次是銅的次生硫化礦， 再次是黃銅礦， 最后是黃鐵礦； 載金黃銅礦的氧化首先是鐵從黃銅礦的晶格中氧化溶解出來， 生成中間產(chǎn)物CuS2和CuS； 較高的酸度和氯化鈉濃度有利于單質(zhì)硫的生成、三價(jià)鐵的水解和銅的浸出， 進(jìn)而有利于金浸出率的提高。
關(guān)鍵字: 含銅金礦； 壓力氧化； 浸出
copper-bearing gold ores
CHEN Jing-he3， ZOU Lai-chang3
（ 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
