Effect of the column height on the performance of liquid-solid fluidized bed for the separation of coarse slime  

作　　者：Sha Jie Xie Guangyuan Wang Hong Liu Junzhang Tang Ligang 

机构地区：[1]School of Chemical Engineering and Technology,China University of Mining&Technology,Xuzhou 221008,China [2]Beijing Huayu Engineering Co.Ltd.,Pingdingshan 467000,China [3]State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《International Journal of Mining Science and Technology》2012年第4期585-588,共4页矿业科学技术学报（英文版）

基　　金：supports for this work provided by the National Natural Science Foundation of China (No. 50974120);the Fundamental Research Funds for the Central Universities (No.2010QNB08)

摘　　要：A liquid-solid fluidized bed separator, used for the separation of coarse slime, was developed. Test parti- cles sized in the range from 0.25 to 0.5, 0.5 to 1.0, and 0.25 to 1.0 mm were separated in the liquid-solid fluidized bed. Beds with column heights of 1200, 1500, and 1800 mm were tried. The clean coal and the railings were subsequently analyzed by float-sink testing. The results showed that the ash and yield of clean coal both decreased with increasing column height, for all three size fractions, and that the ash of the clean coal obtained from tests on the broader size fraction was less than that from the narrower sized fractions. The separation density decreased with increasing column height. The lowest E value was seen for a column height of 1500 ram, for which conditions the separation density was 1.45 g/cm3. The E value was 0.084 for the 0.25-0.5 mm fraction but the corresponding separation density was 1.48 g/cm3, and the E value 0.089, for the broader 0.25-1.0 mm fraction.A liquid-solid fluidized bed separator,used for the separation of coarse slime,was developed.Test particles sized in the range from 0.25 to 0.5,0.5 to 1.0,and 0.25 to 1.0 mm were separated in the liquid-solid fluidized bed.Beds with column heights of 1200,1500,and 1800 mm were tried.The clean coal and the tailings were subsequently analyzed by float-sink testing.The results showed that the ash and yield of clean coal both decreased with increasing column height,for all three size fractions,and that the ash of the clean coal obtained from tests on the broader size fraction was less than that from the narrower sized fractions.The separation density decreased with increasing column height.The lowest E value was seen for a column height of 1500 mm,for which conditions the separation density was 1.45 g/cm 3.The E value was 0.084 for the 0.25-0.5 mm fraction but the corresponding separation density was 1.48 g/cm 3,and the E value 0.089,for the broader 0.25-1.0 mm fraction.

关 键 词：Coarse slimeLiquid-solid fluidized bedColumn heightParticle size fraction 

分 类 号：TQ051.13[化学工程] TK229.66[动力工程及工程热物理—动力机械及工程]