浮选尾煤脱泥再选及其可浮性评价
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摘要
为了解决开滦集团公司某选煤厂浮选尾煤产量大、灰分低、异质细泥含量多的问题,采用φ150、φ75、φ50、φ10 mm串联小锥角水力旋流器组进行脱泥试验研究,通过顺序评价试验,对旋流器组脱泥前后和各级底流煤泥进行可浮性评定。结果表明:各级底流灰分均低于原煤泥灰分,其中φ10mm旋流器底流与溢流灰分差值为11.15%;小于0.015 mm的高灰细泥脱除量占全级的19.73%,脱泥后煤泥灰分降低2.73%,说明小锥角旋流器组脱泥有效。原煤泥可浮性为极难浮,脱泥后提升为难浮,其中φ75 mm与φ50 mm混合底流、φ10 mm底流为较难浮,在精煤灰分不大于11.50%时,脱泥后入浮精煤产率较脱泥前(19.21%)提高8.91%,各级底流单独入浮精煤产率和为31.48%,较脱泥前提高12.27%,说明脱泥后煤泥可浮性得到有效改善。
In order to solve the problem of large amount,low ash and high content of heterogeneous fine mud of coal flotation tailings from a coal preparation plant of Kailuan Group,desliming experiment was conducted using small taper angle hydrocyclone group installed in series of φ150 mm,φ75 mm,φ50 mm,φ10 mm.Through sequential evaluation experiment the hydrocyclone group before and after as well as all levels of the underflow coal slime were evaluated.The results show that all levels of the underflow ash are less than raw fine coal.Withφ10 mm hydrocyclone,the ash difference between underflow and overflow is 11. 15%; the removal rate of less than 0.015 mm high ash content fine slime is 19.73%; the ash yield of fine coal after desliming decreases 2. 73% indicating high effective of hydrocyclone group desliming.The floatability of the raw fine coal is extremely difficult-to-float; after desliming it is promoted to be difficult-to-float. The mixed underflow of φ75 mm and φ50 mm,and underflow of φ10 mm are less difficult-to-float.When ash content of cleaned coal is 11. 50% or less,the yield of the clean coal after desliming is 8.91% higher than before( 19. 21%); the mixed yield of the clean coal from separating flotation is 31. 48%( 12. 27% increase),which means the desliming is able to improve the flotability of fine coal.
In order to solve the problem of large amount,low ash and high content of heterogeneous fine mud of coal flotation tailings from a coal preparation plant of Kailuan Group,desliming experiment was conducted using small taper angle hydrocyclone group installed in series of φ150 mm,φ75 mm,φ50 mm,φ10 mm.Through sequential evaluation experiment the hydrocyclone group before and after as well as all levels of the underflow coal slime were evaluated.The results show that all levels of the underflow ash are less than raw fine coal.Withφ10 mm hydrocyclone,the ash difference between underflow and overflow is 11. 15%; the removal rate of less than 0.015 mm high ash content fine slime is 19.73%; the ash yield of fine coal after desliming decreases 2. 73% indicating high effective of hydrocyclone group desliming.The floatability of the raw fine coal is extremely difficult-to-float; after desliming it is promoted to be difficult-to-float. The mixed underflow of φ75 mm and φ50 mm,and underflow of φ10 mm are less difficult-to-float.When ash content of cleaned coal is 11. 50% or less,the yield of the clean coal after desliming is 8.91% higher than before( 19. 21%); the mixed yield of the clean coal from separating flotation is 31. 48%( 12. 27% increase),which means the desliming is able to improve the flotability of fine coal.
引文
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[17]付晓恒,何为军,王新文,等.一种新的浮选尾煤高附加值综合利用技术[J].中国矿业大学学报,2005,34(6):740-743.FU Xiaoheng,HE Weijun,WANG Xinwen,et al.A novel technology of profitably comprehensive utilization of flotation tailing[J].Journal of China University of Mining&Technology,2005,34(6):740-743.
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[19]荣葵一,宋秀敏.非金属矿物与岩石材料工艺学[M].武汉:武汉工业大学出版社,1996.
[2]张波.我国选煤技术的发展方向与环境保护[J].科技情报开发与经济,2009,19(33):108-109.ZHANG Bo.On the coal preparation technology trend&environmental protection in China[J].Sci-Tech Information Development&Economy,2009,19(33):108-109.
[3]谢广元,吴玲,欧泽深,等.煤泥分级浮选工艺的研究[J].中国矿业大学学报,2005,34(6):759-760.XIE Guangyuan,WU Ling,OU Zeshen,et al.Research on fine coal classified flotation flow sheet[J].Journal of China University of Mining&Technology,2005,34(6):759-760.
[4]李延锋,张晓博,桂夏辉,等.难选煤泥形貌特征及搅拌强化可浮性试验研究[J].中国矿业大学学报,2012,41(6):930-935.LI Yanfeng,ZHANG Xiaobo,GUI Xiahui,et al.The morphological feature of hard-to-float fine coal and enhancing its floatability by stirring[J].Journal of China University of Mining&Technology,2012,41(6):930-935.
[5]XU Zhenghe.Electro kinetic study of clay interactions with coal in flotation[J].International Journal of Mineral Processing,2003,68(1):183-196.
[6]桂夏辉,刘炯天,陶秀祥,等.难浮煤泥浮选速率试验研究[J].煤炭学报,2011,36(11):1895-1900.GUI Xiahui,LIU Jiongtian,TAO Xiuxiang,et al.Studies on flotation rate of a hard-to-float fine coal[J].Journal of China Coal Society,2011,36(11):1895-1900.
[7]岳增川,马力强,李吉辉,等.粗煤泥棒磨和浮选特性试验研究[J].煤炭科学技术,2014,42(11):116-120,100.YUE Zengchuan,MA Liqiang,LI Jihui,et al.Experiment study on characteristics of coarse slime rod-grinding and flotation[J].Coal Science and Technology,2014,42(11):116-120,100.
[8]谢广元.选矿学[M].徐州:中国矿业大学出版社,2001.
[9]任瑞晨,程明,张乾伟,等.小锥角水力旋流器对难浮煤泥脱泥浮选工艺试验研究[J].煤炭学报,2014,39(3):543-548.REN Ruichen,CHENG Ming,ZHANG Qianwei,et al.Study on small taper angle hydrocyclone for pre-desliming flotation process of a difficult-to-float coal slime[J].Journal of China Coal Society,2014,39(3):543-548.
[10]谢广元,吴玲,欧泽深,等.从细粒煤泥中回收精煤的分选与脱水技术研究[J].煤炭学报,2004,29(5):602-605.XIE Guangyuan,WU Ling,OU Zeshen,et al.Study on separation and dewatering techniques of recovering clean coal from fine coal[J].Journal of China Coal Society,2004,29(5):602-605.
[11]王婕,付晓恒,胡二峰,等.煤泥絮团分选超净煤的试验研究[J].煤炭学报,2015,40(8):1929-1935.WANG Jie,FU Xiaoheng,HU Erfeng,et al.Experimental study on flocculation flotation of ultra-clean coal from slime[J].Journal of China Coal Society,2015,40(8):1929-1935.
[12]付晓恒,张龙,胡晓星,等.超细粉碎技术在降低精煤灰分中的应用[J].煤炭科学技术,2010,38(8):125-128.FU Xiaoheng,ZHANG Long,HU Xiaoxing,et al.Application of super fine crushing technology to reduce ash content of clean coal[J].Coal Science and Technology,2010,38(8):125-128.
[13]OATS W J,OZDEMIR O,NGUYEN A V.Effect of mechanical and chemical clay removals by hydrocyclone and dispersants on coal flotation[J].Minerals Engineering,2010,23(5):413-419.
[14]徐初阳,郑描,张明旭,等.浮游选煤中抑制剂的应用及作用机理[J].煤炭学报,2006,31(3):351-354.XU Chuyang,ZHENG Miao,ZHANG Mingxu,et al.Application and affect mechanism of depressant in coal flotation process[J].Journal of China Coal Society,2006,31(3):351-354.
[15]郭德,张秀梅,吴大为,等.脱泥浮选工艺的实践与认识[J].煤炭学报,2000,25(2):208-211.GUO De,ZHANG Xiumei,WU Dawei,et al.Practice and view of deshime floatation technology[J].Journal of China Coal Society,2000,25(2):208-211.
[16]于跃先,马力强,张仲玲,等.浮选尾煤再选试验研究[J].煤炭工程,2014,46(4):109-111.YU Yuexian,MA Liqiang,ZHANG Zhongling,et al.Experimental study on recleaning of coal flotation railings[J].Coal Engineering,2014,46(4):109-111.
[17]付晓恒,何为军,王新文,等.一种新的浮选尾煤高附加值综合利用技术[J].中国矿业大学学报,2005,34(6):740-743.FU Xiaoheng,HE Weijun,WANG Xinwen,et al.A novel technology of profitably comprehensive utilization of flotation tailing[J].Journal of China University of Mining&Technology,2005,34(6):740-743.
[18]王亚伟.DZSN2431三质体高频脱水筛在东曲选煤厂尾煤回收中的应用[J].选煤技术,2015(6):55-58.WANG Yawei.Application of DZSN2431 three masses high frequency ccreen for tailings recovery in Dongqu coal preparation plant[J].Coal Preparation Technology,2015(6):55-58.
[19]荣葵一,宋秀敏.非金属矿物与岩石材料工艺学[M].武汉:武汉工业大学出版社,1996.