煤泥分选超净煤的药剂研究

Research on reagent for coal slime separation of ultra-clean coal

选取动力煤选煤厂煤泥为研究对象,利用傅里叶红外光谱（FTIR）仪和接触角测量仪对比了超细粉碎后的煤泥以及和乳化柴油作用后的煤泥的官能团和润湿性的变化,分析了在絮团浮选中乳化柴油的作用机理。在此基础上,研究了乳化柴油的种类和用量以及分散剂或起泡剂的添加对煤泥絮团分选超净煤的影响。试验结果表明,乳化柴油中的非离子型表面活性剂极性基与煤表面的合氧官能团发生氢键吸附,使煤表面含氧官能团含量减少,接触角增大,疏水性增强;1~#乳化柴油的浮选效果优于2~#乳化柴油;1~#乳化药剂的最佳药剂用量为57.96 kg/t;在分选过程中添加分散剂后得到的超净煤灰分减小,产率也减小;添加起泡剂后分选效果优于单独使用乳化柴油的分选效果。

The authors took coal slime of steam coal preparation plant as object of study, used FTIR and contact angle goniometer to compare the changes of functional groups and wettability of coal slime with or without adding the emulsified diesel oil after ultrafine grinding, analyzed functional mechanism of emulsified diesel during flocculation flotation, and based upon the experiment, studied the influences of types, dosages of emulsified diesel and addition of disper- sant or frother on coal slime flocculation separating ultra-clean coal. The results showed that the hydrogen bonding adsorption occurred between the nonionie surfactant polar groups in emulsified diesel oil and the oxygen-containing functional groups on surface of coal, which leaded reducing on content of oxygen containing functional groups on the surface of coal and increasing of the con- tact angle and wettability, therefore, the flotation results of 1^# emulsified diesel was better than the 2^# emulsified diesel, the optimum dosage of 1^# emulsified diesel was 57.96 kg/t, the ash of the ultra-clean coal with dispersants reduced during separation and the yield was decreased, and the separation results with adding frother was better than the separation results with single emul- sified diesel separately.