选煤厂浓缩机消泡试验研究

Defoaming experiments of thickener

针对新巨龙选煤厂浓缩机泡沫聚集、不易消除的问题,对煤质、浮选药剂制度、煤泥水工艺流程进行了分析和试验研究,结果表明泡沫聚集的原因为浮选入料中含有的黏土矿物导致细泥夹带,恶化了浮选效果;不合理的浮选药剂制度和煤泥水工艺流程导致浓缩机内浮选药剂残留;旋流器溢流带入的低灰煤样在浓缩机内残留浮选药剂的作用下发生了分选。针对以上问题提出解决方案:在浮选柱前增加浮选煤浆预处理设备以提高浮选效率;旋流器溢流进入浮选,或单独沉降;制定合理的浮选药剂制度以减少浮选药剂残留;浓缩机增加泡沫挡板,阻挡泡沫,增加泡沫中细煤泥沉降时间。

There were often a great deal of foam in thickeners in Xinjulong coal preparation plant. To resolve this problem, the coal property, flotation reagent system and coal slurry treatment progress flow were researched. The results show that, the clay minerals in flotation teed lead to fine mud entrainment and deteriorate the flotation, improper flotation reagent system and coal slurry treatment flow make the flotation reagent leave a residue in thickeners, the low-ash coal brought by hydrocyclones overflow is separated with the action of residual flotation reagent in thickeners. The solutions were provided, such as preprocessing slurry before flotation in order to improve the flotation efficiency, draining the hydrocyclones overflow to flotation or thickener, making proper reagent system, adding baffle in thickener to block foam and extend fine slime settling time.