新型药剂对昔阳难浮煤泥浮选效果的改善及其机理研究

Research on mechanism and improvement of floatation effects on Xiyang difficult floated coalslime by new reagent

摘针对昔阳难浮煤泥,采用新型药剂和煤油分别对其进行实验室浮选试验。试验结果表明,当新型药剂用量为1800 g/t时,精煤产率可达到53.85%。采用红外光谱对昔阳煤样、煤油和新型药剂中的化学基团进行表征,结果表明昔阳煤样中含有大量的含氧官能团以及Si类矿物和高岭土等氧化矿物,煤样灰分高且受到氧化,煤泥可浮性差,采用煤油等传统烃类油难以实现高效浮选回收;新型药剂相比煤油含有大量的-OH和-C-O-C-等含氧类基团,这些含氧基团可与煤样表面的含氧基团发生弱氢键键合作用,从而增加新型药剂在煤样表面的吸附作用。采用接触角测定仪对原煤、煤油作用后和新型药剂作用后的煤样进行接触角测定,结果表明煤样与新型药剂接触后,接触角增加,疏水性和可浮性得到显著改善。

The authors conducted a laboratory floatation experiment to test Xiyang difficult floated by new reagent and kerosene.The results showed that when the dosage of the new reagent was1800 g/t,the clean coal productivity increased 53.85%.When using FTIR Spectrometer characterized the chemical groups in Xiyang coal sample,kerosene and the new reagent,the results showed that Xiyang coal sample contained a large amount of oxygen-containing functional groups,Si mineral,kaolin mineral and other oxide minerals,the ash content of coal sample was high and oxidized,floatability of coal slime was poor,kerosene and traditional hydrocarbonoils were difficult to achieve efficient flotation recovery;the new reagent contained amounts of-OH,-C-O-C- and other oxygen-containing groups which can react with oxygen-containing group on coal sample surface by weak hydrogen bonding effects,thereby increasing adsorption of the new reagent on coal sample surface.When using contact angle tester to test the contact angle of raw coal,coal with kerosene and coal with the new reagent,the results showed the contact angle increased and hydrophobicity and floatability were significantly improved after contacting withthe new reagent.