不同碎磨方式下紫金山金铜矿石的磨矿动力学行为
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摘要
对紫金山金铜矿石进行高压辊磨和颚式破碎,然后对2种产品进行分批磨矿试验,基于磨矿动力学原理,借助MATLAB软件分析2种产品磨矿过程中各个粒级的磨矿速度,采用扫描电镜(SEM)对产品表面的微裂纹进行表征,并对磨矿产品的分布特性进行分析。研究结果表明:在磨矿初期,微裂纹是影响磨矿速度的主要原因,微裂纹越多,磨矿速度越快,高压辊磨产品的磨矿速度大于颚式破碎产品的磨矿速度;在粗级别(0.20~3.20 mm)中,高压辊磨产品磨矿速度高于颚式破碎产品的磨矿速度,而且粒度越大,微裂纹数量相差越大,磨矿速度相差越大;随着磨矿时间增加,磨机中粗粒级的质量分数越来越小,微裂纹也越来越少,磨矿概率成为影响磨矿速度的主要原因,高压辊磨产品的磨矿速度等于颚式破碎产品的磨矿速度;高压辊磨碎磨工艺可以使磨矿产品粒度分布更加均匀,优化粒度组成。
Au-Cu ore from Zijinshan was crushed by high pressure grinding rolls(HPGR) and jaw crusher(JC), and batch grinding test of the product crushed by different crushing processes was carried out. Grinding speed of each particle size of the products crushed by HPGR and JC was analyzed by MATLAB based on grinding kinetics principle. The micro-crack of the products was analyzed by means of scanning electron microscope(SEM), and distribution characteristics of the grinding product were analyzed. The results show that at the beginning of the grinding, micro-crack mainly affects the grinding speed of the products crushed by HPGR and JC. The more micro-crack is, the faster grinding speed is. The maximum of grinding speed of the products crushed by HPGR is faster than that by JC in coarse particle size(0.20-3.20 mm), and the more coarse particle size mass fraction is, and the larger the difference of the amount of micro-crack and maximum of grinding speed is. With the increase of grinding time, the content of the coarse particle and micro-crack becomes less and less. Grinding probability mainly affects the grinding speed, leading to the fact that the grinding speed of the product crushed by HPGR is equal to the product crushed by JC. Pulverization technology of HPGR can make grinding particle size distribution more uniform, and also can make size composition more optimal.
Au-Cu ore from Zijinshan was crushed by high pressure grinding rolls(HPGR) and jaw crusher(JC), and batch grinding test of the product crushed by different crushing processes was carried out. Grinding speed of each particle size of the products crushed by HPGR and JC was analyzed by MATLAB based on grinding kinetics principle. The micro-crack of the products was analyzed by means of scanning electron microscope(SEM), and distribution characteristics of the grinding product were analyzed. The results show that at the beginning of the grinding, micro-crack mainly affects the grinding speed of the products crushed by HPGR and JC. The more micro-crack is, the faster grinding speed is. The maximum of grinding speed of the products crushed by HPGR is faster than that by JC in coarse particle size(0.20-3.20 mm), and the more coarse particle size mass fraction is, and the larger the difference of the amount of micro-crack and maximum of grinding speed is. With the increase of grinding time, the content of the coarse particle and micro-crack becomes less and less. Grinding probability mainly affects the grinding speed, leading to the fact that the grinding speed of the product crushed by HPGR is equal to the product crushed by JC. Pulverization technology of HPGR can make grinding particle size distribution more uniform, and also can make size composition more optimal.
引文
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[15]侯英,丁亚卓,印万忠,等.磨矿动力学参数对磨矿速度的影响[J].东北大学学报(自然科学版),2013,34(5):708-711.HOU Ying,DING Yazhuo,YIN Wanzhong,et al.Influence of Grinding Kinetics Parameters on Grinding Speed[J].Journal of Northeastern University(Natural Science),2013,34(5):708-711.
[16]段希祥.碎矿与磨矿[M].2版.北京:冶金工业出版社,2006:179-186.DUAN Xixiang.Crushing and grinding[M].2nd ed.Beijing:Metallurgical Industry Press,2006:179-186.
[2]TORRES M,CASALI A.A novel approach for the modeling of high-pressure grinding rolls[J].Minerals Engineering,2009,22(13):1137-1146.
[3]NAMIK A A,LEVENT E,HAKAN B.High pressure grinding rolls(HPGR)applications in t he cement industry[J].Minerals Engineering,2006,19(2):130-139.
[4]KODALI P,DHAWAN N,DEPCI T,et al.Particle damage and exposure analysis in HPGR crushing of selected copper ores for column leaching[J].Minerals Engineering,2011,24(13):1478-1487.
[5]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):124-127,132.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):124-127,132.
[6]印万忠,吴凯,王纪镇,等.破碎方式对紫金山铜金矿石可磨性及浮选的影响[J].福州大学学报(自然科学版),2014,42(2):321-326.YIN Wanzhong,WU Kai,WANG Jizhen,et al.Effect of different comminuting process on grindability and flotation of Zijinshan Cu-Au ore[J].Journal of Fuzhou University(Natural Science Edition),2014,42(2):321-326.
[7]陈炳辰.磨矿原理[M].北京:冶金工业出版社,1989:318.CHEN Bingchen.Theory of grinding[M].Beijing:Metallurgical Industry Press,1989:318.
[8]MATIJASIC G,KURAJICA S.Grinding kinetics of amorphous powder obtained by sol-gel process[J].Powder Technology,2010,197(3):165-169.
[9]OZKAN A YEKELER M.CALKAVA M.Kinetics of fine wet grinding of zeolite in a steel ball mill in comparison to dry grinding[J].International Journal of Mineral Processing,2009,90(1/2/3/4):67-73.
[10]BAZIN C,OBIANG P.Should the slurry density in a grinding mill be adjusted as a function of grinding media size?[J].Minerals Engineering,2007,20(8):810-815.
[11]FUERSTENAU D W,PHATAK P B,KAPUR P C,et al.Simulation of the grinding of coarse/fine(heterogeneous)systems in a ball mill[J].International Journal of Mineral Processing,2011,99(1/2/3/4):32-38.
[12]侯英,印万忠,丁亚卓,等.不同破碎方式下产品磨矿动力学方程的对比研究[J].有色金属(选矿部分),2014(4):70-74.HOU Ying,YIN Wanzhong,DING Yazhuo,et al.A comparative study of grinding kinetics equation of the product produced by different comminution process[J].Nonferrous Metals(Mineral Processing Section),2014(4):70-74.
[13]侯英,印万忠,丁亚卓,等.不同破碎方式下产品磨矿特性的对比研究[J].有色金属(选矿部分),2014(1):5-8,34.HOU Ying,YIN Wanzhong,DING Yazhuo,et al.Comparative study of grinding characteristics of crushing product produced under different comminution process[J].Nonferrous Metals(Mineral Processing Section),2014(1):5-8,34.
[14]印万忠,吴凯,王纪镇,等.破碎方式对紫金山铜金矿石可磨性及浮选的影响[J].福州大学学报(自然科学版),2014,42(2):321-326.YIN Wanzhong,WU Kai,WANG Jizhen,et al.Effect of different comminuting process on grindability and flotation of Zijinshan Cu-Au ore[J].Journal of Fuzhou University(Natural Science Edition),2014,42(2):321-326.
[15]侯英,丁亚卓,印万忠,等.磨矿动力学参数对磨矿速度的影响[J].东北大学学报(自然科学版),2013,34(5):708-711.HOU Ying,DING Yazhuo,YIN Wanzhong,et al.Influence of Grinding Kinetics Parameters on Grinding Speed[J].Journal of Northeastern University(Natural Science),2013,34(5):708-711.
[16]段希祥.碎矿与磨矿[M].2版.北京:冶金工业出版社,2006:179-186.DUAN Xixiang.Crushing and grinding[M].2nd ed.Beijing:Metallurgical Industry Press,2006:179-186.