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

作　　者：康健 姚泽钰 胡良训 汪岸 黄鹏 刘爽 朱丹 Kang Jian;Yao Zeyu;Hu Liangxun;Wang An;Huang Peng;Liu Shuang;Zhu Dan(Key Laboratory of Rare Mineral,MNR;Hubei Province Geological Test Center;SWEM Construction Engineering Co.,Ltd.)

机构地区：[1]自然资源部稀土稀有稀散矿产重点实验室 [2]湖北省地质实验测试中心 [3]西南能矿建设工程有限公司

出　　处：《黄金》2024年第6期37-40,共4页Gold

基　　金：湖北省自然科学基金项目(2023AFD208)。

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6 h,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%。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 oxidation 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 with 80%distribution,oxygen pressure of 1000 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 pressure 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 

分 类 号：TD953[矿业工程—选矿] TF803[冶金工程—有色金属冶金]