某含金银褐铁矿预处理工艺对氰化浸出的影响  

Cyanidation Leaching Influenced by Pretreatment of Au-Ag-Bearing Limonite

作　　者：刘志强[1,2] 黄清源[2] 朱薇[1] 李伟[1] 邱显扬[1] 

机构地区：[1]广州有色金属研究院广东省稀土开发及应用重点实验室,广东广州510650 [2]中南大学冶金与环境学院,湖南长沙410083

出　　处：《稀有金属》2016年第7期708-714,共7页Chinese Journal of Rare Metals

基　　金：国家科技部"973计划"项目(2012CB724200)资助

摘　　要：研究了某含金银褐铁矿的工艺矿物学,该矿主要矿物为褐铁矿,铁、铜、锌、铅、锰元素主要以氧化物形式均匀分布在褐铁矿中。针对该矿物特性,本研究采用氧化焙烧-浸出工艺对该矿进行预处理,研究了焙烧条件、浸出条件对该矿中铁、铜、锌、铅、锰元素浸出的影响;通过实验最佳预处理工艺条件为:在温度650℃,保温2 h下焙烧,将焙烧渣在室温下,采用浓度1.5 mol·L^(-1)的硫酸溶液、液固比4∶1、浸出4 h下浸出,铁、铜的浸出率分别为:4.16%,42.26%,较好地选择性除铜;将氧化焙烧-酸浸预处理后的矿物与未处理矿物和氧化焙烧-碱性浸出预处理进行氰化浸出试验对比,银浸出率分别为42.61%,7.10%,13.50%,氧化焙烧-酸浸出预处理后银回收率提高了35%;同时可以回收铜、铁等有价元素。The process mineralogy investigation and pretreatment of Au-Ag bearing ore were studied. The analysis of process mineral- ogy showed that the main metallic mineral was limonite, while iron, copper, zinc, lead and manganese were uniformly distributed in the limonite as oxides. Before cyanidation, oxidizing roasting-leaching process （acid and alkaline leaching） was employed as the pre- treatment of the ore. Effects of pretreatment parameters on iron, copper and magnesium extraction were investigated. The best results of iron and copper leaching ratio in this work were 4. 16% and 42.26%, respectively, after the pretreatment of oxidizing roasting （650 ℃ for 2 h） and acid leaching process（ 1.5 mol L-1 H2SO4, liquid-solid ratio of 4： 1, leaching time of 4 h）. The silver leaching ratios of cyanidation of the ore before and after pretreatment （ oxidizing roasting-acid or alkaline leaching） were 42.61% , 7.10% and 13.50% , respectively. The result indicated that the recovery of silver had a remarkable 35% increase compared to a direct cyanidation process without the oxidation roasting-acid leaching pretreatment. Moreover, the valuable metals, such as copper, iron and magnesium could also be recovered.

关 键 词：褐铁矿 预处理 银 氰化 

分 类 号：TF803.21[冶金工程—有色金属冶金]