羧甲基纤维素钠对煤浮选及动力学的影响

Effect of Sodium Carboxymethyl Cellulose on Coal Flotation and Kinetics

以羧甲基纤维素钠(CMC)为抑制剂,探究其对焦煤浮选的影响,分别采用一阶、二阶动力学模型对浮选过程进行拟合,并对其作用机理进行了研究。结果表明:焦煤的浮选过程符合一阶动力学模型。CMC在高岭石表面的吸附量约是煤的4倍,使颗粒表面携带更多的负电荷,与煤之间的静电斥力增强。XRD和FTIR表明,浮选后精煤中高岭石和石英的特征峰强度明显减弱,CMC对煤中高岭石和石英具有良好的抑制作用。

Sodium carboxymethyl cellulose(CMC) was used as an inhibitor to explore its influence on coal flotation.The first-order and second-order kinetic models were used to fit the flotation process,and the mechanism of action was studied.The results showed that the first-order kinetic model could give a prominent fit to the flotation process of coking coal.The adsorption capacity of CMC on the surface of kaolinite was about 4 times larger than that of coal,which made the surface of the kaolinite and coal become more negatively charged,and the electrostatic repulsion between the kaolinite and coal was enhanced.XRD and FTIR showed that the intensities of the characteristic peaks of kaolinite and quartz in the concentrate was significantly weakened,and CMC had a good inhibitory effect on kaolinite and quartz.