碘化物对金精矿碘化浸出过程的影响.pdf

第23卷第5期
中国有色金属学报
2013年5月
Vol 23 No5
The Chinese Journal of Nonferrous Metals
May 2013
文章编号:1004-0609(02013)05-1434-06
碘化物对金精矿碘化浸出过程的影响
李绍英,王海霞,孙春宝,赵留成,阎志强
(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:采用碘一碘化物浸出体系,从碘初始含量、碘与碘化物摩尔比和浸出液pI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600rmin,浸出时间为4h,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。
关键词:金精矿;碘化物;浸出;碘初始含量;碘与碘化物摩尔比
中图分类号:TF111
文献标志码:A
Effects of different iodides on gold concentrates leaching process in
iodine-iodide solution
LI Shao-ying, WANG Hai-xia, SUN Chun-bao, ZHAO Liu-cheng, YAN Zhi-qinag
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 leachin 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 potassiun
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 C, the
gold leaching rates are around 90%; whereas the gold leaching effect is poorer when hydrogen iodide(aqueous solution
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; ]caching: initial iodine content; iodine and iodide molar ratio
目前,世界各国提金方法主要以氧化法为主。氰的研究。随着科学技术的进步,黄金提取工艺有了很
化法提金工艺筒单,金回收率高,浸出过程容易控制,大的发展。国内外已有的非氰提金工艺主要有硫脲法
对矿石适用性强;但是它也存在着一些不容忽视的硫代硫酸盐法、石硫合剂法、卤素提金法、丙二腈法(有
缺点:氧化物有刷毒,环境污染大:浸金速度慢;对机腈法)、硫氰化物法和多硫化物法等?。
细粒包裹金、高砷、高硫、含有机碳的难处理金矿石
碘化法是一种非氰化提金法,早在20世纪90年
浸出效果差;浸出过程易受铜、铁、铅、锌和硫等杂代,国外一些研究人员就开始对碘化浸金进行研究,
质的影响?等。因此,人们一直在致力于非氯浸出剂并取得了一定的成果。QI等研究了金在碘一碘化物
基金项目:高等学校博上学科点专项科研基金资助项目(201000011003
收稿日期:2012-07-05:修订目期:2012-12-15
通信作者:孙春宝,教投,博士:电话:010-62334953:E-mail: suncbqustb.edu.cn