复配药剂浮选低阶煤泥的效能研究

Efficiency of compound reagents flotation of low-rank coal slime

基于传统捕收剂浮选低阶煤产率低,药剂消耗大的问题,将煤油与活性物质混合,配制了由煤油与酯或脂肪醇聚氧乙烯醚类非离子表面活性剂按照一定比例配制而成的4种复配药剂,并对葫芦素不黏煤进行了浮选试验,测定了4种药剂在水中的分散粒径及对煤的吸附热,并通过多元回归研究了分散粒径、吸附热以及吸附平衡时间与浮选精煤产率之间的相关关系。结果表明:相同药剂用量下,4种复配药剂浮选精煤产率均高于煤油;当精煤产率相同时,复配药剂的用量至少比煤油节省50%。4种复配药剂的分散粒径均小于煤油,在矿浆中更易分散;润湿热均大于煤油,在煤表面吸附作用更强,使煤表面疏水性进一步增大。回归分析表明:在浮选过程中,分散粒径、吸附热和吸附平衡时间对浮选均有显著作用,其中浮选精煤产率与吸附热正相关,与吸附平衡时间、分散粒径负相关,分散粒径与吸附热之间存在交互作用。煤油与活性物质的复配,能够显著增强煤油的捕收能力,提高精煤产率及可燃体回收率,为低阶煤煤泥浮选提供了新的高效捕收剂。

Due to the problems of low yield of low-rank coal flotation with traditional collectors and large consumption of reagents,using kerosene with the active substance,four kinds of compound medicaments are prepared by kerosene and ester or fatty alcohol polyoxyethylene ether nonionic surfactant according to a certain proportion were prepared,flotation was performed on the Hulusu non-cohesive coal,the dispersed size of the mixed and the adsorption heat were measured.the relationship between dispersed size,adsorption heat and the time of wetting balance on the clean coal yield were study by regression analysis.The results showed that the clean coal yield was higher than that of kerosene for the mixed at the same dosage.When the clean coal yield was the same,the mixed was at least 50%lower than that of kerosene.The dispersed sizes of the mixed are all smaller than kerosene,so easily dispersed in the pulp;the adsorption heat is greater than kerosene,and the adsorption on the coal surface is stronger,so the surface hydrophobicity of the coal is further increased.regression analysis showed that the dispersed size,the adsorption heat and the time of adsorption balance had significant effects on the flotation,and the clean coal yield was positively correlated with the heat of wetting,and negatively correlated with the time of wetting balance and the dispersed size,and there is an interaction between the dispersed size and the adsorption heat.The compounding of kerosene and active substances can significantly enhance the collection ability of kerosene,increase clean coal yield and the recovery of combustibles,provide a new efficient collector for the low-rank coal slime flotation.