某尾矿强磁选预富集产品的工艺矿物学研究及可选性分析  

Mineralogy Study and Washability Analysis of Tailings High Intensity Magnetic Separation Pre-enrichment Products

作　　者：郑海雷 高起方 龚明辉[1,2] 孙昊延 ZHENG Hailei;GAO Qifang;GONG Minghui;SUN Haoyan(Yunnan Gold&Mining Group Co.,Ltd.,Kunming 650299,China;Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;State Key Laboratory of Mesoscience and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]云南黄金矿业集团股份有限公司,云南昆明650299 [2]昆明理工大学国土资源工程学院,云南昆明650031 [3]中国科学院过程工程研究所介科学与工程全国重点实验室,北京100190

出　　处：《金属矿山》2024年第10期92-99,共8页Metal Mine

基　　金：国家自然科学基金项目(编号:22378405)。

摘　　要：西南某多金属原生矿现场尾矿TFe品位13.88%,有害元素S含量为1.24%,主要脉石成分SiO2含量为40.82%,铁矿物主要以赤褐铁矿、菱铁矿及磁铁矿的形式存在,属复杂难选铁尾矿资源。为制定合理的二次资源综合回收工艺,从工艺矿物学角度出发,利用场发射扫描电镜(FESEM)、背散射电子成像(BSE)、X射线能谱分析(EDS)、矿物特征自动定量分析系统(AMICS)等多种检测手段,对现场强磁选预富集产品开展了矿物组成、铁矿物粒度分布、主要元素赋存状态、嵌布特征、解离特征以及热分解特性等系统的工艺矿物学研究。结果表明:采用预氧化—低温还原磁化焙烧—弱磁选选冶联合工艺,预富集产品经550℃预氧化7.5min后,在450℃、还原势R=0.6的条件下磁化焙烧7.5min,可获得作业产率90.84%、铁品位30.02%、磁化率95.05%的磁化焙烧产品;磁化焙烧产品再磨至-38μm占89.5%,经两段弱磁选铁,可获得作业产率28.94%、铁品位60.18%、铁作业回收率63.86%的铁精矿。研究结果可为后续开展合理的资源高效、综合回收试验提供理论支撑。The grade of TFe in the on-site tailings of a polymetallic primary ore in southwest China is 13.88%,the content of harmful element S is 1.24%,and the main gangue component SiO2 content is 40.82%.Iron minerals mainly exist in the form of hematite,siderite and magnetite,which are complex and refractory iron tailings resources.In order to formulate a reasonable comprehensive recovery process of secondary resources,from the perspective of process mineralogy,field emission scanning electron microscopy(FESEM),backscattered electron imaging(BSE),X-ray energy spectrum analysis(EDS),automatic quantitative analysis system of mineral characteristics(AMICS)and other detection methods are used to carry out systematic process mineralogy research on mineral composition,particle size distribution of iron minerals,occurrence state of main elements,embedding characteristics,dissociation characteristics and thermal decomposition characteristics of on-site high-intensity magnetic separation pre-enrichment products.The results show that the pre-oxidation-low temperature reduction magnetization roasting-low intensity magnetic separation beneficiation-metallurgy combination process is adopted.The pre-enriched product is pre-oxidized at 550℃for 7.5 min,under the condition of 450℃,reduction potential R=0.6 and magnetic roasting for 7.5 min,the magnetic roasting product with operation yield of 90.84%,iron grade of 30.02%and magnetic susceptibility of 95.05%can be obtained.The magnetic roasting product is reground to-38μm particle size of 89.5%.After two-stage low-intensity magnetic iron separation,iron concentrate with operation yield of 28.94%,iron grade of 60.18%and iron operation recovery of 63.86%can be obtained.The research results can provide theoretical support for the subsequent development of reasonable resource efficient and comprehensive recovery experiments.

关 键 词：超低品位难选铁资源 菱铁矿 赤铁矿 工艺矿物学研究 预氧化-低温还原磁化焙烧 

分 类 号：TD926[矿业工程—选矿] TD981