粉煤灰磁珠精细化分级试验研究

Experimental study on fine classification of magnetosphere from coal flyash

粉煤灰的磁选产物磁珠中Fe含量差异大,物化性质波动范围广。研究采用套筛与摇床对磁珠进行联合分级,获取了粒径和密度不同的产物,并对产物的物化性质进行了分析。磁珠筛分试验得到〉75、75~58、58~38、<38μm粒级的分级产物,随着磁珠粒径减小,Fe含量依次为22.48%、38.07%、46.03%、52.44%。选取<38μm粒级磁珠再进行摇床分级试验,得到三组密度不同的产物,随着密度增加,Fe含量依次为47.49%、64.36%、71.43%。研究结果表明,粉煤灰磁珠通过筛分与摇床联合的精细化分级,可实现铁含量的富集,有利于对磁珠进行高值化利用。

The magnetosphere produced through magnetic separation of flyash not only varies in Fe content but also fluctuates widely in physiochemical property.Analysis is made of the physiochemical properties of the magnetosphere products of different sizes and densities obtained through combined classification with screen set and shaking table.Through classification 4 different graded products in sizes of>75,75〜58,58〜38,<38μm are obtained,which have each an ash content of 22.48%,38.07%,46.03%and 52.44%,indicating that the smaller the size,the higher the Fe content becomes.After resizing of the<38μm size through tabling,three groups of the products with different densities are produced with their Fe contents being 47.49%,64.34%and 71.43%respectively showing that the Fe content tends to increase with increase of density.Test result shows that fine grading of flyash magnetosphere through sizing and tabling combined process can yield a Fe-enriched magnetosphere product,beneficial to its utilization as a high-value material.