煤泥含量对重介质悬浮液稳定性和流动性的影响  

Effect of coal slime content on dense medium suspension stability and fluidity

作　　者：张志军[1] 周琦 温亚培 李思凡 许振峰 Zhang Zhijun;Zhou Qi;Wen Yapei;Li Sifan;Xu Zhenfeng(School of Chemical&Environmental Engineering,China University of Mining&Technology-Beijing,Beijing 100083,China;Dandong Dongfang Measurement&Control Technology Co.,Ltd.,Dandong Liaoning 118002,China)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]丹东东方测控技术股份有限公司,辽宁丹东118002

出　　处：《矿业科学学报》2020年第6期696-702,共7页Journal of Mining Science and Technology

基　　金：国家自然科学基金(51704300);北京市自然科学基金(2192046)。

摘　　要：重介质悬浮液的稳定性和流动性是影响重介质旋流器分选效果的两个相互矛盾的因素。为探寻悬浮液性质对重介质旋流器分选效果的影响,通过测量悬浮液密度变化和零时表观黏度,研究了不同煤泥含量对悬浮液稳定性和流动性的影响,并进行了实验室重介质旋流器分选试验。结果表明:重介质悬浮液的煤泥含量是影响悬浮液稳定性和流动性的主要因素。同一悬浮液密度下,煤泥含量越高,悬浮液密度下降越慢,其稳定性越好;不同密度的悬浮液达到稳定所需的煤泥含量不同,悬浮液密度越高,达到稳定所需的煤泥量越少。重介质悬浮液的煤泥含量对其流动性的影响效果与稳定性相反,悬浮液密度越大、煤泥含量越高,则黏度越大、流动性越差。实验室重介质旋流器分选试验表明,在悬浮液密度为1.50 g/cm^3的条件下,当煤泥含量为20%时,错配物含量最低,其分选效果最好。The stability and fluidity of dense medium suspension are two contradictory factors that affect the separation performance of dense medium cyclone.By dense medium suspension density and apparent viscosity measurement,the effect of dense medium properties on the separation performance was investigated,and the best coal slime content was determined by lab-scale dense medium separation.The result showed that coal slime content was the major factor to affect the dense medium stability and fluidity.Under the same dense medium suspension density,higher coal slime content resulted in slower suspension density decline and better dense medium stability.Coal slime content required for stability of dense medium suspension varied.Dense medium suspension of higher density could become stable with less coal slime content.The effect of coal slime content on the fluidity was opposite to that on stability.Higher suspension density and coal slime content could lead to higher viscosity and fluidity deterioration.In the lab-scale dense medium separation,20%of coal slime content was optimal with the lowest mismatch rate acquired in suspension density of 1.50 g/cm^3.

关 键 词：重介质悬浮液 煤泥含量 表观黏度 稳定性 流动性 

分 类 号：TD94[矿业工程—选矿]