湖北某低品位含碳质金矿碱性加压预氧化—氰化浸出试验研究
Experimental study on alkaline pressure pre-oxidation-cyanide leaching of low-grade carbonaceous gold ore in Hubei Province
康健 1姚泽钰 2胡良训 2汪岸 1黄鹏 1刘爽 1朱丹1
作者信息
- 1. 自然资源部稀土稀有稀散矿产重点实验室;湖北省地质实验测试中心
- 2. 西南能矿建设工程有限公司
- 折叠
摘要
湖北某尾矿金品位0.325 g/t,含碳0.49%,属典型低品位含碳质金矿.工艺矿物学表明,矿石中主要矿物组成为石英、高岭石和伊利石,79.59%的碳质分布于有机碳中.采用直接氰化浸出、表面钝化—氰化浸出、竞争吸附—氰化浸出、化学氧化预处理—氰化浸出等浸出工艺,金浸出率均不足20%.劫金性能试验表明,该尾矿劫金指数为 1.462 g/t,属于中劫金类金矿,使用碱性加压预氧化工艺能大大降低碳质的劫金效应,提高氰化浸出金浸出率.在磨矿细度为-0.074 mm占比80%,氧分压为1 000 kPa,液固比2∶1,氢氧化钠用量为5%,加压预氧化时间为6h,搅拌速度为200 r/min的条件下进行碱性加压预氧化—氰化浸出,金浸出率达到64.15%.
Abstract
The gold grade of a tailings sample in Hubei is 0.325 g/t,with a carbon content of 0.49%,belonging to typical low-grade carbonaceous gold ore.The mineralogy indicates that the main minerals in the ore are quartz,kaolinite,and illite,with 79.59%of carbon distributed in organic carbon.Various leaching processes such as direct cyanide leaching,surface passivation-cyanide leaching,competitive adsorption-cyanide leaching,and chemical oxi-dation pre-treatment-cyanide leaching were employed,but the gold leaching rates were all less than 20%.The preg-robbing performance test shows that the tailings have a preg-robbing index of 1.462 g/t,belonging to the medium preg-robbing category.The alkaline pressure pre-oxidation process significantly reduced the carbonaceous preg-robbing effect and increased gold leaching efficiency.Under specific conditions of grinding fineness at-0.074 mm with80%distribution,oxygen pressure of 1 000 kPa,liquid-solid ratio of 2∶1,sodium hydroxide dosage of 5%,and pressure pre-oxidation time of 6 h at an agitation rate of 200 r/min,the gold leaching rate reached 64.15%by alkaline pres-sure pre-oxidation-cyanide leaching.
关键词
难处理金矿/含碳质金矿/加压预氧化/劫金效应/氰化浸出Key words
refractory gold ore/carbonaceous gold ore/pressure pre-oxidation/preg-robbing effect/cyanide leaching引用本文复制引用
基金项目
湖北省自然科学基金(2023AFD208)
出版年
2024
NETL
NSTL
万方数据