分散—絮凝对某微细粒磁铁矿弱磁精选效果的影响

金属矿山 ›› 2016, Vol. 45 ›› Issue (09): 83-87.

分散—絮凝对某微细粒磁铁矿弱磁精选效果的影响

苏涛¹，陈铁军^1,2，张一敏^1,2，胡佩伟^1,2，冯杨¹

1.武汉科技大学资源与环境工程学院，湖北武汉 430081；2.冶金矿产资源高效利用与造块湖北省重点试验室，湖北武汉 430081

出版日期:2016-09-15 发布日期:2016-10-18

Influence of Dispersion-flocculation on Micro-fine Magnetite Low Intensity Magnetic Separation

Su Tao¹，Chen Tiejun^1,2，Zhang Yimin^1,2，Hu Peiwei^1,2，Feng Yang¹

1.College of Resource and Environment Engineering,Wuhan University of Science and Technology，Wuhan 430081，China；2.Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan 430081,China

Online:2016-09-15 Published:2016-10-18

摘要/Abstract

摘要： 甘肃某微细粒嵌布的贫磁铁矿石因最终磨矿产品粒度极细，常规弱磁选指标较差。为改善选别效果、提高分选指标，对弱磁精选前的分散—选择性絮凝条件进行了研究，并借助激光粒度分析仪对分散—絮凝效果进行了测定。结果表明：矿石在磨矿1细度为-74 μm占90.43%、磨矿2细度为-30 μm占93.45%、弱磁精选1分散剂六偏磷酸钠用量为500 g/t，絮凝剂CMS用量为750 g/t，矿浆pH=11情况下，采用磨矿1—弱磁粗选—磨矿2—2次弱磁精选流程处理，最终获得铁品位为62.82%、铁回收率为79.12%的铁精矿，该精矿比常规弱磁精矿铁品位和铁回收率分别提高了1.28和5.08个百分点。分散—絮凝机理分析表明：在分散状态下，磁铁矿表面电荷负值较石英小，阴离子型絮凝剂CMS可通过氢键作用选择性吸附磁铁矿颗粒，显著增大磁铁矿微细颗粒的粒径，从而改善磁选效果、提高选矿指标。

关键词: 微细粒嵌布的磁铁矿, 分散, 选择性絮凝, 弱磁选

Abstract: The beneficiation index of conventional low intensity magnetic separation is poor in treating a micro-fine disseminated and low grade magnetite ore from Gansu. To improve beneficiation effect and increase separation index，dispersion-selective flocculation conditions research before low intensity magnetic separation was studied，and the dispersion-flocculation effect were determined with laser particle size analyzer. The results showed that：iron concentrate with iron grade of 62.82%，iron recovery of 79.12% was ultimately obtained with first stage grinding fineness of -74 μm accounted for 90.43%，second stage grinding fineness of -30 μm accounted for 93.45%，low intensity magnetic separation one with sodium hexametaphosphate as dispersion of 500 g/t，carboxymethyl starch(CMS) as flocculation of 750 g/t，pulp pH of 11，via grinding 1-low intensity magnetic rough separation-grinding 2- two times low intensity magnetic cleaning separation process，the grade and recovery of iron concentrate increased by 1.28 and 5.08 percentage points compared with the conventional low intensity magnetic concentrate. Dispersion-flocculation mechanism analysis showed that：little absolute value of surface charge compared with quartz makes Polymer CMS adsorbed on the surface of magnetite by hydrogen bond in dispersion condition，which lead to increased particle size of fine magnetite ore，improve the magnetic separation effect and the beneficiation indexes.

Key words: Micro-fine disseminated magnetite, Dispersion, Selective flocculation, Low intensity magnetic separation

苏涛, 陈铁军, 张一敏, 胡佩伟, 冯杨. 分散—絮凝对某微细粒磁铁矿弱磁精选效果的影响[J]. 金属矿山, 2016, 45(09): 83-87.

SU Tao, CHEN Tie-Jun, ZHANG Yi-Min, HU Pei-Wei, FENG Yang. Influence of Dispersion-flocculation on Micro-fine Magnetite Low Intensity Magnetic Separation[J]. Metal Mine, 2016, 45(09): 83-87.

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