摘要
流态化浮选为结合重选与浮选特点的新兴粗粒分选技术,其在传统的流态化干扰床分选中引入微泡以增大煤与矸石颗粒之间的密度差异,可有效提高粗粒煤的分选效率。气泡直径是影响分选效果的关键因素之一,通过改变气泡发生器结构以产生2种不同尺径分布的气泡群,探究气泡直径对不同粒级粗粒煤炭的分选影响。结果表明:随着中煤入料粒级的增大,流态化浮选的精煤产率和回收率逐渐减小;在不同粒度级入料条件下,减小气泡尺度有利于中间粒度级煤炭颗粒的流态化浮选回收;流态化浮选后的精尾煤粒度出现分级现象,而气泡尺度减小可有效减小粗粒度级精尾煤的分级程度。
Fluidized flotation is a new coarse particle flotation technique combining the characteristics of gravity separation and flotation.By introducing microbubbles into the traditional teeter bed separator,the density difference between clean coal and coal gangue can be increased to improve the separation efficiency of coarse coal particles.It is expected that bubble size is one of the key factors affecting the separation performance.The influence of bubble diameter on the separation of coarse coals with different particle sizes was investigated by changing the structure of bubble generator to produce two kinds of bubble groups with different diameter distribution.The results showed that with the increase of middling-coal feeding particle size,the clean coal yield and recovery of fluidized flotation decrease gradually.The reduction of bubble size is beneficial to the fluidized flotation recovery of intermediate coal particles under different particle size feeding conditions.There is a classification phenomenon in the concentration and tailing after fluidized flotation,and reducing the bubble size can effectively decrease the classification degree of the concentration and tailing with coarse particles feeding.
作者
张晗
李超
曹亦俊
ZHANG Han;LI Chao;CAO Yijun(Henan Province Industrial Technology Research Institute of Resources and Materials,Zhengzhou University,Zhengzhou 450001,China;School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《煤质技术》
2021年第2期53-57,共5页
Coal Quality Technology
基金
国家重点研发计划资助项目(2020YFC1908803)。
关键词
流态化浮选技术
气泡直径
分选效果
粗粒分选
入料粒级
分级程度
精煤产率
回收率
fluidized flotation technology
bubble diameter
separation effect
coarse separation
feed size
classification degree
clean coal yield
recovery rate
