(北京科技大学 金属矿山高效开采与安全教育部重点实验室，北京 100083)
摘 要: 采用碘-碘化物浸出体系，从碘初始含量、碘与碘化物摩尔比和浸出液pH值3个影响因素入手，考察不同碘化物(碘化铵、碘化钾和碘化氢)对金精矿碘化浸出过程的影响。结果表明：在碘初始含量为1%，碘与碘化物摩尔比为1:8，浸出液pH值为7，液固比为4:1，搅拌速度为600 r/min，浸出时间为4 h，温度为25 ℃的条件下，用碘化铵或碘化钾作为碘化浸金的络合剂，金的浸出率均能达到90%左右，而用碘化氢(其水溶液为氢碘酸)作络合剂时，金的浸出率仅有75%。考虑到不同碘化物浸金效果差异及工业应用的可行性等因素，确定碘化钾为适宜的金精矿碘化浸出络合剂。
关键字: 金精矿；碘化物；浸出；碘初始含量；碘与碘化物摩尔比
（Key Laboratory for High-Efficient Mining and Safety of Metal Mines, Ministry of Education,University of Science and Technology Beijing, Beijing 100083, China）
Abstract:Using the iodine-iodide leaching system, the effects of different iodides (ammonium iodide，potassium iodide，hydrogen iodide)on gold concentrates leaching process were discussed from the influence factors, such as initial iodine content, iodine and iodide ratio and solution pH value. The results show that, when ammonium iodide or potassium iodide is used as complex agent，under the conditions of initial iodine content of 1%, iodine and iodide molar ratio of 1:8, pH value of 7, liquid-solid ratio of 4:1, stirring speed of 600 r/min, leaching time of 4 h and temperature of 25 ℃, the gold leaching rates are around 90%; whereas the gold leaching effect is poorer when hydrogen iodide(aqueous solution is hydroiodic acid) is used as complex agent, and the gold leaching rate is only 75%. Considering the difference of leaching effect and availability of industry and so on，potassium iodide is the suitable complex reagent of gold concentrate leaching in iodine-iodide solution.
Key words: gold concentrate; iodide; leaching; initial iodine content; iodine and iodide molar ratio
