低品位菱镁矿摩擦电选提纯的试验研究
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摘要
为了有效利用低品位菱镁矿,同时降低菱镁矿分选提纯成本,拟采用摩擦电选对低品位菱镁矿进行分选提纯的试验研究。试验借助X线荧光光谱仪以及扫描电子显微镜对低品位菱镁矿做基础分析后,再采用较纯菱镁矿与石英(品位分别大于47.00%和99.00%)分别研究其与不同塑料颗粒球碰撞摩擦之后的荷电性质。按照菱镁矿与石英的质量比为6:1配制MgO品位为40.80%的低品位菱镁矿作为模拟物料完成分选试验。研究结果表明:菱镁矿和石英与PVC颗粒球摩擦之后,呈现出明显荷电差异,菱镁矿表面荷电量为+3.42nC/g,而石英表面荷电量为-5.56 nC/g。在自制电选设备中,采用粒度为3 mm的PVC颗粒球作为填充摩擦介质;试验电压为15 kV,气流流量为60 m3/h,给料速度为4.5 g/s,获得MgO品位为45.09%,回收率为68.40%的分选效果。摩擦电选可以实现对低品位菱镁矿中SiO_2的脱除。
In order to effectively utilize the low grade magnesite and reduce the purification cost of magnesite, the low grade magnesite was sorted and purified by triboelectric beneficiation. After the basic analysis of low-grade magnesite with X-ray fluorescence(XRF) and scanning electron microscope(SEM), the charge properties of pure magnesite and quartz(more than 47.00% and 99.00%) after the collision with different plastic particles were studied respectively. The grade of 40.80% magnesite was prepared by pure magnesite and quartz with the mass ratio of 6:1. The results show magnesite and quartz charge differently after having friction with PVC particles. The magnesite surface charge is+3.57 nC/g, while the quartz surface charge is-5.56 nC/g. The 3 mm PVC particles are filled as the friction medium in the lab-made triboelectrostatic separator. The Mg O grade and recovery rate are 45.09% and 68.40% at 15 kV voltage,with wind speed being 60 m3/h and feed rate being 4.5 g/s. The triboelectrostatic beneficiation can remove SiO2 from low grade magnesite effectively.
In order to effectively utilize the low grade magnesite and reduce the purification cost of magnesite, the low grade magnesite was sorted and purified by triboelectric beneficiation. After the basic analysis of low-grade magnesite with X-ray fluorescence(XRF) and scanning electron microscope(SEM), the charge properties of pure magnesite and quartz(more than 47.00% and 99.00%) after the collision with different plastic particles were studied respectively. The grade of 40.80% magnesite was prepared by pure magnesite and quartz with the mass ratio of 6:1. The results show magnesite and quartz charge differently after having friction with PVC particles. The magnesite surface charge is+3.57 nC/g, while the quartz surface charge is-5.56 nC/g. The 3 mm PVC particles are filled as the friction medium in the lab-made triboelectrostatic separator. The Mg O grade and recovery rate are 45.09% and 68.40% at 15 kV voltage,with wind speed being 60 m3/h and feed rate being 4.5 g/s. The triboelectrostatic beneficiation can remove SiO2 from low grade magnesite effectively.
引文
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[2]闫平科,赵永帅,高玉娟,等.低品位菱镁矿水化试验研究[J].硅酸盐通报,2016,35(4):1096-1100.YAN Pingke,ZHAO Yongshuai,GAO Yujuan,et al.Hydration experimental of low-grade magnesite[J].Bulletin of the Chinese Ceramic Society,2016,35(4):1096-1100.
[3]周宝余,李志坚,吴锋,等.用菱镁矿碎矿生产烧结镁砂的试验研究[J].耐火材料,2015,49(2):137-139.ZHOU Baoyu,LI Zhijian,WU Feng,et al.Experimental study on the production of sintered magnesia with magnesite crushed ore[J].Refractories,2015,49(2):137-139.
[4]李志锋.辽宁低品位菱镁矿的综合开发利用研究[J].国土资源,2008(z1):78-79.LI Zhifeng.Study on comprehensive development and utilization of low grade magnesite in Liaoning Province[J].Land and Resources,2008(z1):78-79.
[5]ZHANG Qiang,TAO Qi,HE Hongping,et al.An efficient SO2-adsorbent from calcination of natural magnesite[J].Ceramics International,2017,43(15):12557-12562.
[6]高玉娟,闫平科.低品位菱镁矿资源开发利用研究[J].中国非金属矿工业导刊,2011(3):17-18.GAO Yujuan,YAN Pingke.Study on utilization of low grade magnesite resources[J].China Non-metallic Mineral Industry,2011(3):17-18.
[7]谢鹏永,罗旭东,郝长安.低品位菱镁矿的热选提纯工艺研究[J].耐火材料,2017,51(1):53-56.XIE Pengyong,LUO Xudong,HAO Changan.Study on hot-selection and purification of low-grade magnesite[J].Refractories,2017,51(1):53-56.
[8]CHEN Gonglun,TAO Danie.Effect of solution chemistry on floatability of magnesite and dolomite[J].International Journal of Mineral Processing,2004,74(1/2/3/4):343-357.
[9]马蒂斯K A,魏明安.菱镁矿和白云石的脂肪酸浮选[J].国外金属矿选矿,1995,33(5):26-34.MATISO K A,WEI Mingan.Fatty acid flotation of magnesite and dolomite[J].Foreign Metals Mineral Processing,1995,33(5):26-34.
[10]杨志超,冯雅丽,李浩然,等.菱镁矿煅烧浮选除钙及其机理[J].中国有色金属学报,2012,22(10):2944-2950.YANG Zhichao,FENG Yali,LI Haoran,et al.Separability of calcium from magnesite by flotation and its mechanism[J].The Chinese Journal of Nonferrous Metals,2012,22(10):2944-2950.
[11]张晨洋,陈建铭,宋云华.菱镁矿混合氯化镁焙烧制备高纯氧化镁[J].无机盐工业,2016,48(12):27-31.ZHANG Chenyang,CHEN Jianming,SONG Yunhua.Preparation of high purity magnesium from calcining magnesite mixed with magnesium chloride[J].Inorganic Chemicals Industry,2016,48(12):27-31.
[12]陈浩,王玺堂,胡庆华,等.熔盐法制备氧化镁粉体的研究[J].无机盐工业,2010,42(3):14-16.CHEN Hao,WANG Xitang,HU Qinghua,et al.Study on preparation of magnesium powder by molten salt method[J].Inorganic Chemicals Industry,2010,42(3):14-16.
[13]董怡为.稻谷的摩擦带电特性研究[J].农业机械学报,2006,37(8):33-37.DONG Yiwei.Study on triboelectrification property of grain[J].Journal of Agricultural Mechanization,2006,37(8):33-37.
[14]李海生,章新喜,陈英华.摩擦电选中摩擦器内颗粒的碰撞特性[J].中国矿业大学学报,2012,41(4):607-612.LI Haisheng,ZHANG Xinxi,CHEN Yinghua.Collision characteristics of particles in the friction device of triboelectrostatic separator[J].Journal of China University of Mining&Technology,2012,41(4):607-612.
[15]关明久.国内外菱镁矿选矿的进展概况[J].轻金属,1992,8(1):8-11.GUAN Mingjiu.Progress of magnesite mineralization at home and abroad[J].Light Metals,1992,8(1):8-11.
[16]SCHUTYSER M A I,VAN DER GOOT A J.The potential of dry fractionation processes for sustainable plant protein production[J].Tends in Food Science&Technology,2011,22(4):154-164.
[17]WU Guiqing,LI Jia,XU Zhenming.Triboelectrostatic separation for granular plastic waste recycling:a review[J].Waste Management,2013,33(3):585-597.
[18]TILMATINE A,BENABBOUN A,BRAHMI Y,et al.Experimental investigation of a new triboelectrostatic separation process for mixed fine granular plastics[J].IEEE Transactions on Industry Applications,2014,50(6):4245-4250.
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