河南某微细粒复杂难选金矿回收金试验研究  

Experimental Study on Gold Recovery from a Fine Complex Refractory Gold Ore in Henan

作　　者：卢意恺 陈伟华 柳林[3] LU Yikai;CHEN Weihua;LIU Lin(Henan Fifth Geological Exploration Institute Co.,Ltd.,Zhengzhou 450000,China;Henan First Geology and Mineral Survey Institute Co.,Ltd.,Luoyang 471023,Henan,China;Zhengzhou Institute of Multipurpose Utilization of Mineral Resources,CAGS,Zhengzhou 450006,China)

机构地区：[1]河南省第五地质勘查院有限公司,郑州450000 [2]河南省第一地质矿产调查院有限公司,河南洛阳471023 [3]中国地质科学院郑州矿产综合利用研究所,郑州450006

出　　处：《有色金属（选矿部分）》2024年第9期49-56,共8页Nonferrous Metals（Mineral Processing Section）

基　　金：国家重点研发计划项目(2020YFC190880);河南省科技攻关项目(242102320151)。

摘　　要：河南某金矿石含金1.91 g/t,为主要有价元素,现场经浮选处理后尾矿中仍含金0.43 g/t,有较多损失,为进一步降低尾矿中金的含量,提高金的回收率,对原矿进行了详细的工艺矿物学分析。结果显示,矿石中含金矿物主要为银金矿,载体矿物主要为黄铁矿,脉石矿物主要为石英、长石、云母、白云石等,金的嵌布粒度整体较细,绝大部分在10μm以下,选别难度较大。针对矿石性质,进行了磨矿细度、矿浆pH值、分散剂用量、活化剂用量、捕收剂种类及用量、起泡剂用量等条件试验和金回收的闭路试验。结果表明,在磨矿细度为-0.074 mm占85%、矿浆pH自然状态、分散剂六偏磷酸钠用量为300 g/t、活化剂组合硫酸铜和KDH01用量分别为100 g/t和50 g/t、捕收剂丁基黄药用量为200 g/t、起泡剂MIBC用量为40 g/t的条件下,原矿采用“一次粗选—两次扫选—两次精选”流程,中矿采用循序返回方式,扫选药剂用量依次按粗选药剂用量减半添加,精选不加药,全流程闭路试验最终可获得金品位30.63 g/t、回收率86.28%的金精矿产品,尾矿中金品位降至0.28 g/t,显著提高了金的回收率,回收效果较好,同时,自研活化剂KDH01对该金矿有较好的适用性,增加了矿物表面活性位点,增强了浮选效能,有效指导了实际生产。The gold ore in Henan province contained 1.91 g/t of gold,which was the main valuable element.There was still 0.43 g/t of gold in the tailings after flotation treatment in the mineral dressing plant.In order to reduce the gold content in the tailings and improve the gold recovery,a detailed process mineralogy studied was conducted on the raw ore.The results showed that the gold-bearing minerals were mainly electrum,the gold-carrier minerals were mainly pyrite,and the gangue minerals were mainly quartz,feldspar,mica,dolomite,and so on.The gold disseminated grain size was generally fine,most of which was below 10μm,making the separation difficult.Based on the properties of the raw ore,the effects of experimental conditions such as grinding fineness,ore pulp pH,dispersant dosage,activator dosage,collector type and dosage,frother dosage were discussed.The results showed that under the conditions of grinding fineness of-0.074 mm accounting for 85%,ore pulp pH of natural state,sodium hexametaphosphate dosage of 300 g/t as dispersant,copper sulfate and KDH01 dosage of 100 g/t and 50 g/t as activator,butyl xanthate dosage of 200 g/t as collector,and MIBC dosage of 40 g/t as frother,the raw ore can obtain a gold concentrate product with gold grade of 30.63 g/t and recovery of 86.28%through the full process locked-cycle test of“one roughing-two scavengings-two cleanings”,and the middlings were returned in a sequential manner with the amount of scavenging reagent halved in proportion to the amount of roughing reagent,and no chemical reagent were added during the cleaning process.The gold grade in the tailings was reduced to 0.28 g/t,which significantly improved the recovery of gold.At the same time,the self-developed activator KDH01 increased the surface active sites of minerals and enhanced the flotation efficiency,which had a good applicability to this gold ore and effectively guided the actual production.

关 键 词：微细粒难选金矿 浮选 提金 综合回收 

分 类 号：TD953[矿业工程—选矿]