(北京科技大學(xué) 金屬礦山高效開采與安全教育部重點(diǎn)實(shí)驗(yàn)室，北京 100083)
摘 要: 采用碘-碘化物浸出體系，從碘初始含量、碘與碘化物摩爾比和浸出液pH值3個影響因素入手，考察不同碘化物(碘化銨、碘化鉀和碘化氫)對金精礦碘化浸出過程的影響。結(jié)果表明：在碘初始含量為1%，碘與碘化物摩爾比為1:8，浸出液pH值為7，液固比為4:1，攪拌速度為600 r/min，浸出時間為4 h，溫度為25 ℃的條件下，用碘化銨或碘化鉀作為碘化浸金的絡(luò)合劑，金的浸出率均能達(dá)到90%左右，而用碘化氫(其水溶液為氫碘酸)作絡(luò)合劑時，金的浸出率僅有75%。考慮到不同碘化物浸金效果差異及工業(yè)應(yīng)用的可行性等因素，確定碘化鉀為適宜的金精礦碘化浸出絡(luò)合劑。
關(guān)鍵字: 金精礦；碘化物；浸出；碘初始含量；碘與碘化物摩爾比
（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
