非离子表面活性剂对氧化煤吸附及浮选行为的影响

Effects of Nonionic Surfactants on Adsorption and Flotation Behavior of Oxidized Coal

为提高细粒氧化煤表面疏水性,改善浮选效果,选取了三种含有不同疏水尾链的非离子表面活性剂:C_(12)EO_(15),AC-1215,NPEO_(15),考查了初始质量浓度和吸附时间对三种表面活性剂在氧化煤表面吸附量的影响,结合FTIR和浮选实验,对比了三者在氧化煤表面的吸附差异.结果表明,疏水尾链结构对非离子表面活性剂在氧化煤表面的吸附效果有重要影响.在实验质量浓度范围内,随着三种溶剂质量浓度增大,氧化煤对溶剂的吸附量及精煤产率均提高;C_(12)EO_(15)可以显著增强氧化煤表面疏水性,浮选精煤产率由49.39%升至84.83%;NPEO_(15)次之,精煤产率最高可达81.14%;AC-1215的吸附效果一般,精煤产率最高可达58.58%.

In order to improve the surface hydrophobicity and the floatation efficiency of fine oxidized coal,three kinds of nonionic surfactants containing different hydrophobic chains including C 12 EO 15,AC-1215,and NPEO 15 were selected.The effects of initial mass concentration and adsorption time on the adsorption amount of three surfactants on oxidized coal surface were investigated.FTIR and flotation experiments were carried out to compare the adsorption differences on oxidized coal surface of three surfactants.The results show that the structure of hydrophobic tail chain of nonionic surfactant has an important influence on the adsorption effect on oxidized coal surface.In the experimental mass concentration range,with the increase of the mass concentration of three solvents,the adsorption capacity and cleaned coal yield of oxidized coal both increase,C 12 EO 15 can significantly enhance the surface hydrophobicity of oxidized coal,the cleaned coal yield rises from 49.39%to 84.83%;and NPEO 15 is the second,the cleaned coal yield is up to 81.14%;the adsorption effect of AC-1215 is general,and the cleaned coal yield is up to 58.58%.