抑制剂对屯兰选煤厂细煤泥浮选效果的影响研究

Study on the effect on fine coal flotation performance produced by depressing agent at Tunlan Coal Preparation Plant

针对屯兰选煤厂细煤泥浮选效率低、生产成本高等问题,分别以煤油和仲辛醇作为捕收剂、起泡剂,探索水玻璃和三偏磷酸钠、羧甲基纤维素钠三种抑制剂对细煤泥浮选效果的影响规律,并确定不同药剂的最佳用量。试验结果表明:在试验范围内,随着抑制剂用量的增加,细煤泥浮选效果逐步改善,但过量添加抑制剂会使其浮选效果变差;当羧甲基纤维素钠用量为40 g/t时,细煤泥浮选效果最好,浮选精煤产率为69.72%,对应的灰分为9.81%,精煤可燃体回收率为78.60%,浮选完善指标为44.40%。

The fine coal flotation system of Tunlan Coal Preparation Plant is operating with a low efficiency and high cost. For tackling this problem,experiments have been conducted on the performance of the flotation system with the use of kerosene as collector and sec. Octyl alcohol as frother and sodium silicate,sodium trimetaphosphate and sodium carboxymethyl cellulose as depressing agents. It is aimed to making known the law of the influence produced by the use of each kind of depressant and determine its optimal dosage. As evidenced by test result,within the extent of the experiments,the flotation performance tends to improve gradually with the increase of dosage of depressing agent and become deteriorated with over-dosage. It is found that when CMC is used at a dosage of 40 g / t,a best flotation performance as follows can be expected： concentrate yield and ash-69. 72% and 9. 81%; recovery rate of combustible matter-78. 60%; and flotation performance index-44. 40%.