甘肃岷县某金矿床南矿带矿石选矿试验研究  

Experimental study of the beneficiation of the ores on the southern ore belt in a gold deposit,Minxian,Gansu

作　　者：康成鑫 杨可 姬省军 郝柏松 惠保意 Kang Chengxin;Yang Ke;Ji Shengjun;Hao Baisong;Hui Baoyi(Xi’an Mineral Resources Survey Center,China Geological Survey;Innovation Center for Gold Exploration Technology,China Geological Survey)

机构地区：[1]中国地质调查局西安矿产资源调查中心 [2]中国地质调查局金矿勘查技术创新中心

出　　处：《黄金》2025年第4期48-53,58,共7页Gold

基　　金：中央财政地质调查项目(DD20242983,DD20242949)。

摘　　要：甘肃岷县某金矿以黄铁矿为主要载金矿物,具有粒度微细、有害元素砷含量偏高等特点,金主要以包裹金形式存在。为有效回收矿石中金,对该矿床南矿带矿石进行选矿试验研究,对比浮选、重选、炭浸、焙烧等单一及联合工艺回收效果。结果表明:浮选可有效回收南矿带矿石中金和银,可获得金精矿金品位45.41 g/t、银品位134.00 g/t,金回收率73.76%、银回收率84.05%的指标。由于主要载金矿物黄铁矿中平均砷含量较高且矿石中存在毒砂,因此南矿带矿石浮选得到的金精矿含砷1.00%,经过降砷探索试验后得出金和砷的关系比较密切,不能有效地进行分离。A gold deposit in Minxian,Gansu,features fine-grained pyrite as the primary gold-bearing mineral,with elevated hazardous arsenic content and gold predominantly occurring as encased gold.To optimize gold recovery from the ores,beneficiation tests of the ores on the southern ore belt were conducted comparing the recovery effects of flotation,gravity separation,carbon-in-leach(CIL),and roasting,both individually and in combination.Results indicate that flotation effectively recovers gold and silver from the ores on the southern ore belt,yielding a gold concentrate grade of 45.41 g/t Au and 134.00 g/t Ag,with recovery rates of 73.76%Au and 84.05%Ag.However,due to high average arsenic levels in gold-bearing pyrite and the presence of arsenopyrite,the gold concentrate retains 1.00%arsenic through the flotation of the ores on the southern ore belt.Exploratory arsenic reduction tests revealed a strong correlation between gold and arsenic,rendering effective separation unfeasible.

关 键 词：资源利用 含砷 浮选 包裹金 难选矿石 卡林型金矿 

分 类 号：TD953[矿业工程—选矿]