炼焦中煤的尺度效应及对浮选的影响

发布时间：2018-02-09 01:23

  本文关键词： 炼焦中煤 尺度效应 浮选　出处：《煤炭学报》2016年02期 　论文类型：期刊论文

【摘要】：为了考察煤泥粒度变细对浮选效果的影响,从不同细度颗粒的几何特征、润湿热及浮选行为3方面探讨了炼焦中煤的尺度效应。使用BET比表面测定仪、微量热仪分别研究了炼焦中煤粒度减小对其比表面积、总孔容和平均孔径及润湿热的影响,用Young-Laplace方程分析了基于毛细管作用捕收剂吸附的变化,通过半经验公式计算了颗粒粒径及润湿性对上浮概率的影响,并进行了不同细度超低灰精煤的浮选试验。研究表明,随着炼焦中煤粒度的变细,其比表面积和总孔容呈数倍增大,Ⅱ类孔增多,平均孔径增加;基于毛细管作用的捕收剂吸附增强,对去离子水的润湿热值急剧降低;存在最佳粒度范围使颗粒的上浮概率最大,中等紊流强度的浮选环境中,控制疏水颗粒粒径在-200+45μm或亲水性颗粒粒径在-10μm或+45μm均可强化浮选回收。相同浮选药剂条件下,煤泥粒度越细,煤的回收率越难以保障,并且水回收率呈增加趋势,浮选效率降低。
[Abstract]:In order to investigate the effect of coal slime granularity on flotation effect, the scale effect of coal in coking was discussed from three aspects: geometric characteristics of different fineness particles, moist heat and flotation behavior. BET specific surface tester was used to measure the size of coal in coking process. The effects of coal particle size reduction in coking on specific surface area, total pore volume, average pore size and wetting heat were studied by microcalorimeter. The change of collector adsorption based on capillary action was analyzed by Young-Laplace equation. The effects of particle size and wettability on the floating probability were calculated by semi-empirical formula, and the flotation tests of ultra-low ash concentrate with different fineness were carried out. The specific surface area and total pore volume increased several times, the type 鈪，

本文编号：1496743