分散剂在煤泥及其主要组分表面的吸附机理研究

Study on the adsorption mechanism of dispersants on the surface of coal slime and its main components

针对煤泥结构特性及利用现状,本文以腐殖酸钠(SH)和木质素磺酸钠(SLS)为研究药剂,探究了不同分散剂在煤泥表面的吸附性能,并借助分子模拟手段揭示了药剂在煤泥主要组分表面的作用机制。结果表明,SH和SLS在煤泥/兰炭表面的吸附动力学过程遵循准二级动力学方程,拟合所得相关系数R2均大于0.99,分散剂在颗粒表面的吸附受化学吸附控制。同时,SLS在水/煤界面和水/高岭石界面都具有较优的吸附性能,说明SLS更易于与在煤泥内主要组分发生吸附,吸附SLS后高岭石体系水分子的扩散系数D降低至6.69×10^(-9)m^(2)·s^(-1),从微观层面解释了SLS在煤泥表面的吸附量大于腐殖酸钠以及加入木质素磺酸钠能更明显改善含煤泥燃料浆浆体性能的原因。

In response to the structural characteristics and application status of coal slime,this article selected sodium humate and sodium lignosulfonate as research reagents to explore the adsorption performance of different dispersants on the surface of coal slime,and revealed the mechanism of action of the reagents on the surface of the main components of coal slime using molecular simulation methods.The results showed that the adsorption kinetics of SH and SLS on the surface of coal slime/semi-coke in this experiment followed the pseudo-second-order kinetic equation,and the fitted correlation coefficients R^(2) were greater than 0.99.The adsorption of dispersants on the particle surface was controlled by chemical adsorption.At the same time,SLS had better adsorption performance at both the water/coal interface and the water/kaolinite interface,which indicated that SLS was more likely to adsorb the main components in the slime,and differen coefficient D of water molecules in the kaolinite system was reduced to 6.69×10^(-9)m^(2)·s^(-1) after adsorption of SLS,explaine the adsorption amount of SLS on the slime surface was greater than that of sodium humate,and the addition of sodium lignosulfonate could significantly improve the performance of the slurry containing coal slime.