煤泥对木质素系分散剂的吸附性能研究
Study on Adsorption Performance of Coal Slime to Lignosulfonates Dispersant
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摘要: 为了解木质素系分散剂(LS)对煤泥成浆性能的影响,根据LS在煤泥表面的静态吸附试验,采用动力学方程和等温吸附模型对吸附曲线进行拟合分析,研究LS在煤泥表面的吸附作用机理。结果表明:LS初始浓度对吸附过程有显著影响,初始质量浓度为0.4 g/L时,吸附效果最佳;LS初始浓度相同时,吸附量随温度升高而增加;吸附过程符合伪二级动力学方程,吸附速率由表面扩散和颗粒内扩散联合控制;吸附行为符合Langmuir和Freundlich吸附等温方程,热力学参数计算结果表明LS主要通过氢键、静电等作用自发吸附在煤泥表面,通过增加煤泥表面润湿性,提高浆体分散稳定性。Abstract: In order to understand the influence of lignosulfonates dispersant ( LS) on the slurry ability of coal slime, the adsorption mechanism of LS in coal slime s urface was carried out through static adsorption experiments and the adsorption curves were analyzed by kinetic equations and isothermal adsorption models. The resu Its showed that the initial concentration of LS had notable effects on adsorption. The best absorption effect could be obtained while the initial concentration of LS was 0. 4 gI L. Meanwhile, the adsorption capacity increased with temperature at the same concentration of LS. Adsorption process fit well pseudo second order kinetics equati on and the adsorption rate of LS on the coal slime was controlled by the combination of surface diffusion and intraparticle diffusion. The adsorption behaviors well accor ded with the Langmuir and Freundlich isotherm equation. The thermodynamic parameters calculation results indicated that LS spontaneously adsorb on the coal slime t 0 increase the surface wetting properties of coal slime as well as the stability of coal slime water mixture by hydrogen bond and static electricity functions.
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Keywords:
- coal slime /
- lignosulfonates dispersant /
- coal water slurry /
- adsorption kinetics
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