津巴布韦某难选铁矿选矿工艺实验  

Beneficiation Process Test of a Refractory Iron Ore in Zimbabwe

作　　者：纪振明 JI Zhenming(Zhongye Changtian International Engineering Co.,Ltd.,Changsha 410017,Hunan,China)

机构地区：[1]中冶长天国际工程有限责任公司,湖南长沙410017

出　　处：《矿产综合利用》2025年第1期113-118,共6页Multipurpose Utilization of Mineral Resources

摘　　要：为了确定津巴布韦某难选铁矿石合理的选矿工艺流程和技术指标,更好地开发该矿山铁矿石资源,在原矿化学多元素分析、铁物相分析、矿物组成分析、主要矿物单体解离度分析等矿石性质研究的基础上,进行了大量的工艺条件实验,最终确定了阶段磨矿-弱磁选-脉动高梯度强磁选-磁选精矿阳离子反浮选的工艺流程。研究表明,矿石中有用铁矿物以磁铁矿、赤铁矿为主,且结晶粒度较细,主要分布在-0.05 mm,在一段磨矿粒度P_(80) 63μm条件下进行一段弱磁选和强磁选、二段磨矿粒度P_(80) 45μm条件下进行二段弱磁选、强磁选和阳离子反浮选,可以获得产率38.25%、铁品位66.75%、SiO_(2)含量3.56%的合格铁精矿,达到精矿品位≥66.20%的目标要求。In order to determine the reasonable beneficiation process and technical indicators of the refractory iron ore in Zimbabwe and better develop its iron ore resources,a lot of process condition tests were carried out based on ore properties such as chemical element analysis of the raw ore,iron phase,mineral composition,and dissociation degree analysis of main mineral monomers.Finally,the process flow of stage grinding-low-intensity magnetic separation-pulsed high-gradient magnetic separation-cationic reverse flotation was determined.The results show that the useful iron minerals in the ore are mainly magnetite and hematite,and the crystal size is fine,mainly distributed below-0.05 mm.At the condition of primary grinding particle size P_(80)63μm,the first stage low-intensity magnetic separation and high-intensity magnetic separation are carried out,and the second stage low-intensity magnetic separation,high-intensity magnetic separation and cationic reverse flotation are carried out at the condition of secondary grinding particle size P_(80)45μm.The qualified iron concentrate with yield of 38.25%,iron grade of 66.75%and SiO_(2) content of 3.56%can be obtained,which meets the target requirement of concentrate grade≥66.20%.

关 键 词：复杂难选矿 弱磁选 脉动高梯度磁选 反浮选 

分 类 号：TD951[矿业工程—选矿]