微波预处理对钒钛磁铁矿磨矿动力学的影响
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摘要
利用磨矿动力学研究了微波处理前后不同粒级钒钛磁铁矿的破碎速率(S1)及初始破碎分布函数(B_(i,j)),并分析了磨矿产品的表面形貌及物相组成的变化.结果表明:微波处理前后钒钛磁铁矿均遵循一级磨矿动力学,微波处理后矿石的S1值均高于未处理矿石,且增加的幅度随着矿石粒度的增加而增大.微波处理前后钒钛磁铁矿的B_(i,j)取决于入料粒度,微波处理后矿石的粒度分布函数γ值均小于未处理矿石; SEM分析表明:微波处理后磨矿产品有着更小的粒度尺寸和更粗糙的表面; XRD分析表明:球磨后,微波处理后的矿石有着更强的衍射峰和更多的脉石相,说明矿石的解离程度得到提高.
The specific rate of breakage( S1) and primary breakage distribution( B_(i,j)) of untreated and microwave-treated vanadium titano-magnetite( VTM) with different particle size were investigated using grinding kinetics, and the variations of surface topography and phase composition of ground products were analyzed. The results show that the breakages of both untreated and microwave-treated VTM obey the first-order grinding kinetics. The S1 of microwave-treated VTM is higher than that of untreated ore and the S1 increment increases with increasing particle size. The primary breakage distribution parameters( γ) are dependent upon the feed particle size. The γ value of B_(i,j) of microwave-treated VTM is less than that of untreated ore.The SEM analysis shows that the ground products have smaller particle size and rougher surface after microwave treatment. The XRD analysis shows that microwave-treated VTM has stronger diffraction peaks and larger amounts of gangue phases after ball mill,compared to those of untreated ore,which indicates that the degree of dissociation of ore is improved.
The specific rate of breakage( S1) and primary breakage distribution( B_(i,j)) of untreated and microwave-treated vanadium titano-magnetite( VTM) with different particle size were investigated using grinding kinetics, and the variations of surface topography and phase composition of ground products were analyzed. The results show that the breakages of both untreated and microwave-treated VTM obey the first-order grinding kinetics. The S1 of microwave-treated VTM is higher than that of untreated ore and the S1 increment increases with increasing particle size. The primary breakage distribution parameters( γ) are dependent upon the feed particle size. The γ value of B_(i,j) of microwave-treated VTM is less than that of untreated ore.The SEM analysis shows that the ground products have smaller particle size and rougher surface after microwave treatment. The XRD analysis shows that microwave-treated VTM has stronger diffraction peaks and larger amounts of gangue phases after ball mill,compared to those of untreated ore,which indicates that the degree of dissociation of ore is improved.
引文
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[2] Kingman S W,Rowson N A. Microwave treatment of minerals:a review[J]. Minerals Engineering,1998,11(11):1081-1087.
[3] Batchelor A R,Jones D A,Plint S,et al. Deriving the ideal ore texture for microwave treatment of metalliferous ores[J].Minerals Engineering,2015,84(12):116-129.
[4] Rizmanoski V. The effect of microwave pretreatment on impact breakage of copper ore[J]. Minerals Engineering,2011,24(14):1609-1618.
[5] Jiang Y T,Zhang Q,Liu Y,et al. Influence of microwave irradiation on boron concentrate activation with an emphasis on surface properties[J]. Applied Surface Science,2016,385:88-98.
[6] Bozkurt V,Ozgür I. Dry grinding kinetics of colemanite[J].Powder Technology,2007,76(2/3):88-92.
[7]刘全军,熊燕琴.微波在铁矿石选择性磨细中的应用机理研究[J].云南冶金,1997,26(3):25-28.(Liu Quan-jun,Xiong Yan-qin. The application mechanism of microwave in selective grinding of iron ore[J]. Yunnan Metallurgy,1997,26(3):25-28.)
[8] Vorster W,Rowson N A,Kingman S W. The effect of microwave radiation upon the processing of Neves Corvo copper ore[J]. International Journal of Mineral Processing,2001,3(1):9-44.
[9]王俊鹏,姜涛,刘亚静,等.钒钛磁铁矿微波助磨实验[J].东北大学学报(自然科学版),2017,38(11):1559-1563.(Wang Jun-peng,Jiang Tao,Liu Ya-jing,et al. Experiment of microwave-assisted grinding on vanadium titano-magnetite[J]. Journal of Northeastern University(Natural Science),2017,38(11):1559-1563.)
[10] Samanli S. A comparison of the results obtained from grinding in a stirred media mill lignite coal samples treated with microwave and untreated samples[J]. Fuel,2011,90(2):659-664.
[11] Qian H Y,Kong Q G,Zhang B L. The effects of grinding media shapes on the grinding kinetics of cement clinker in ball mill[J]. Powder Technology,2013,235(2):422-425.
[12] Zhao R,Han Y,He M,et al. Grinding kinetics of quartz and chlorite in wet ball milling[J]. Powder Technology,2017,305(1):418-425.
[13] Yekeler M,Ozkan A,Austin L G. Kinetics of fine wet grinding in a laboratory ball mill[J]. Powder Technology,2001,114(1/2/3):224-228.
[14] Austin L G,Yekeler M,Dumm T F,et al. The kinetics and shape factors of ultrafine dry grinding in a laboratory tumbling ball mill[J]. Particle&Particle Systems Characterization,1990,7(1/2/3/4):242-247.
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