大同低阶煤泥浮选试验研究

Experimental research on Datong low-rank coal flotation

分析了大同侏罗纪低阶煤泥粒度组成,说明煤样泥化不严重,煤样粒度组成对浮选有利。通过X射线光电子能谱仪对煤泥表面性质进行研究,说明煤泥含有较多石英,表面含氧基团主要是C—OH和—COO,这2个基团均显示较强亲水性,对煤泥浮选不利。通过煤泥浮选试验,探讨了阳离子型表面活性剂十二胺对煤泥浮选的促进作用。结果表明:以煤油为捕收剂,仲辛醇为起泡剂进行浮选时,加入少量十二胺可降低药剂总量,提高煤泥表面疏水性,改善煤泥浮选效果;确定最佳药剂用量为:仲辛醇200 g/t,组合捕收剂1000 g/t,其中十二胺质量分数为5%,此时精煤产率、尾煤灰分、可燃体回收率和浮选完善指标分别比纯煤油提高了7.11%,13.47%,7.77%和3.69%。

The analysis of size distribution of Datong Jurassic low-rank slime show that the argillitization of coal samples is not serious and the size distribution is suitable for flotation. The X-ray photo electron spectroscopy （XPS） is used to test the surface property of coal samples, the results show that the surface oxygen-containing groups mainly are C--OH and --COO,which are highly hydrophilic and make the flotation difficult. The acceleration of cationic surfactant dodecyl amine on slime flotation is discussed through flotation experiments taking kerosene as collector and sec-octyl alcohol as frother. The results indicate that the addition of small dodecyl amine can reduce the consumption of flotation reagents, increase the sample surface hydrophobieity and improve the flotation effect. The optimum dosage of sec-oetyl alcohol and combined collector respectively are 200 g/t and 1000 g/t, and the mass fraction of dodecyl amine is 5 percent. Under this condition, the yield of clean coal, tail ash, combustible material recovery and faultless index of flotation respectively increase by 7.11 percent, 13.47 percent,7.77 percent and 3.69 percent.