高压辊磨超细粉碎对钒钛磁铁矿分选的影响
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摘要
采用常规颚式破碎和高压辊磨2种不同粉碎方式,进行钒钛磁铁矿的分选试验,探究2种破碎方式对钒钛磁铁矿分选的影响,并结合粒度分析、单体解离度测试及比磁化系数分析,进一步研究高压辊磨机在钒钛磁铁矿选别中的作用机理。研究结果表明:高压辊磨机粉碎产品的粒度较小,可直接通过弱磁选将钛磁铁矿和钛铁矿分离开,进行"铁钛平行分选";与颚式破碎机破碎产品相比,辊压产品经过一段磨矿过程就能通过相同的分选条件获得质量合格的钛磁铁矿精矿,并使钛铁矿精矿TiO2的作业回收率提高2.66%;2种破碎产品在球磨过程中的单体解离度存在差异,辊压产品中的含铁矿物能够优先实现单体解离,有利于钛磁铁矿的分选;"铁钛平行分选"能够简化磨矿过程,减少微细粒钛铁矿的生成量,提高钛铁矿强磁选的回收率,有利于钛铁矿的窄级别浮选。
The separation experiments of vanadium titanium magnetite(V-Ti) crushed by conventional jaw crusher and high pressure grinding rolls(HPGR) were conducted. The influences of two different comminuting processes on separation of V-Ti magnetite were studied. Combined with the anslysis of particle size, degree of mineral liberation and specific susceptibility, the mechanism of HPGR in the separation process of V-Ti magnetite was studied. The results show that the products of HPGR are finer than those of conventional jaw crusher. Parallel separation of titanium magnetite(Fe)and ilmenite(Ti) can be realized through direct separation of Fe and Ti by low intensity magnetic separation from product crushed by HPGR. Qualified titanium magnetite can be obtained by only once grinding and other similar conditions, and the TiO2 operational recovery of ilmenite increases by 2.66%. The mineral degree of liberation in the primary grinding from this two comminuting processes become obviously different. Iron minerals of HPGR product preferentially achieve monomer dissociation, which benefits the separation of titanium magnetite. On the other hand, the parallel separation of Fe and Ti simplifies the grinding and reduces the generation of micro-fine ilmenite, which is beneficial to the high intensity magnetic separation and flotation of narrow size for ilmenite.
The separation experiments of vanadium titanium magnetite(V-Ti) crushed by conventional jaw crusher and high pressure grinding rolls(HPGR) were conducted. The influences of two different comminuting processes on separation of V-Ti magnetite were studied. Combined with the anslysis of particle size, degree of mineral liberation and specific susceptibility, the mechanism of HPGR in the separation process of V-Ti magnetite was studied. The results show that the products of HPGR are finer than those of conventional jaw crusher. Parallel separation of titanium magnetite(Fe)and ilmenite(Ti) can be realized through direct separation of Fe and Ti by low intensity magnetic separation from product crushed by HPGR. Qualified titanium magnetite can be obtained by only once grinding and other similar conditions, and the TiO2 operational recovery of ilmenite increases by 2.66%. The mineral degree of liberation in the primary grinding from this two comminuting processes become obviously different. Iron minerals of HPGR product preferentially achieve monomer dissociation, which benefits the separation of titanium magnetite. On the other hand, the parallel separation of Fe and Ti simplifies the grinding and reduces the generation of micro-fine ilmenite, which is beneficial to the high intensity magnetic separation and flotation of narrow size for ilmenite.
引文
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[13]ZENG Shanglin,ZENG Weilong,REN Liuyi,et al.Development of a high gradient permanent magnetic separator(HGPMS)[J].Mineral Engineering,2015,71:21-26.
[14]ZENG Wenqing,XIONG Dahe.The latest application of SLon vertical ring and pulsating high-gradient magnetic separator[J].Minerals Engineering,2003,16(6):563-565.
[15]曾剑武,陈禄政,丁利,等.棒介质组合方式对脉动高梯度磁选效果的影响[J].金属矿山,2015(3):161-164.ZENG Jianwu,CHEN Luzheng,DING Li,et al.Effect of rod matrix arrangement on pulsating high gradient magnetic separation performance[J].Metal Mine,2015(3):161-164.
[16]袁致涛,王常任.磁电选矿[M].2版.北京:冶金工业出版社,2011:16-29.YUAN Zhitao,WANG Changren.Mineral processing by magnetoelectric[M].2nd ed.Beijing:Metallurgical Industry Press,2011:16-29
[17]徐翔,章晓林,张文彬.攀枝花钒钛磁铁矿浮钛时磨矿细度的影响[J].矿山机械,2010,38(9):93-96.XU Xiang,ZHANG Xiaolin,ZHANG Wenbin.Effect of grinding fineness of ilmenite from vanadium titano-magnetite in Panzhihua district[J].Mining&Processing Equipment,2010,38(9):93-96.
[2]LIU Lei,TAN Qi,LIU Lu,et al.Comparison of different comminution flowsheets in terms of minerals liberation and separation properties[J].Minerals Engineering,2018,125:26-33
[3]朱俊士.钒钛磁铁矿选矿[M].北京:冶金工业出版社,1996:3-64.ZHU Junshi.Separation of vanadium titanium magnetite[M].Beijing:Metallurgical Industry Press,1996:3-64.
[4]李亮,罗建林.攀枝花地区某钒钛磁铁矿工艺矿物学研究[J].金属矿山,2010(4):89-93.LI Liang,LUO Jianlin.Process mineralogy studies on V-Ti magnetite in Panzhihua[J].Metal Mine,2010(4):89-93.
[5]王洪彬,李丽匣,申帅平,等.微细粒级钛铁矿预富集工艺研究[J].矿冶工程,2016,36(5):37-40.WANG Hongbin,LI Lixia,SHEN Shuaiping,et al.Optimization of preconcentration process to reclaim microfine ilmenite[J].Mining and Metallurgical Engineering,2016,36(5):37-40.
[6]ZHU Yangge,ZHANG Guofan,FENG Qiming,et al.Effect of surface dissolution on flotation separation of fine ilmenite from titanaugite[J].Transactions of Nonferrous Metals Society of China,2011,21(5):1149-1154.
[7]袁致涛,郭小飞,严洋,等.攀西钒钛磁铁矿高压辊磨的产品特性[J].东北大学学报(自然科学版),2012,33(1):124-128.YUAN Zhitao,GUO Xiaofei,YAN Yang,et al.Product characteristics of vanadium-titanium magnetite from Panxi by high pressure grinding roller[J].Journal of Northeastern University(Natural Science),2012,33(1):124-128.
[8]郭小飞,袁致涛,申帅平,等.铁钛平行分选对微细粒钛铁矿强磁选的影响[J].东北大学学报(自然科学版),2016,37(2):253-257,262.GUO Xiaofei,YUAN Zhitao,SHEN Shuaiping,et al.Effect of parallel separation of Fe and Ti on high-intensity magnetic separation of micro-fine ilmenite[J].Journal of Northeastern University(Natural Science),2016,37(2):253-257,262.
[9]侯英,丁亚卓,印万忠,等.邦铺钼铜矿石高压辊磨后物料的特性[J].中南大学学报(自然科学版),2013,44(12):4781-4786.HOU Ying,DING Yazhuo,YIN Wanzhong,et al.Product characteristics of Mo-Cu ore from Bangpu by high pressure grinding rolls[J].Journal of Central South University(Science and Technology),2013,44(12):4781-4786.
[10]TORRES M,CASALI A.A novel approach for the modelling of high-pressure grinding rolls[J].Minerals Engineering,2009(22):1137-1146.
[11]TAVARES L M.Particle weakening in high-pressure roll grinding[J].Minerals Engineering,2005,18(7):651-657.
[12]CELIK I B,ONER M.The influence of grinding mechanism on the liberation characteristics of clinker minerals[J].Cement and Concrete Research,2006,36(3):422-427.
[13]ZENG Shanglin,ZENG Weilong,REN Liuyi,et al.Development of a high gradient permanent magnetic separator(HGPMS)[J].Mineral Engineering,2015,71:21-26.
[14]ZENG Wenqing,XIONG Dahe.The latest application of SLon vertical ring and pulsating high-gradient magnetic separator[J].Minerals Engineering,2003,16(6):563-565.
[15]曾剑武,陈禄政,丁利,等.棒介质组合方式对脉动高梯度磁选效果的影响[J].金属矿山,2015(3):161-164.ZENG Jianwu,CHEN Luzheng,DING Li,et al.Effect of rod matrix arrangement on pulsating high gradient magnetic separation performance[J].Metal Mine,2015(3):161-164.
[16]袁致涛,王常任.磁电选矿[M].2版.北京:冶金工业出版社,2011:16-29.YUAN Zhitao,WANG Changren.Mineral processing by magnetoelectric[M].2nd ed.Beijing:Metallurgical Industry Press,2011:16-29
[17]徐翔,章晓林,张文彬.攀枝花钒钛磁铁矿浮钛时磨矿细度的影响[J].矿山机械,2010,38(9):93-96.XU Xiang,ZHANG Xiaolin,ZHANG Wenbin.Effect of grinding fineness of ilmenite from vanadium titano-magnetite in Panzhihua district[J].Mining&Processing Equipment,2010,38(9):93-96.