基于EDLVO理论的电化学作用强化褐煤煤泥水沉降研究

Research on Electrochemical Action to Promote Slime Water Settlement Based on EDLVO Theory

以褐煤煤泥、纯褐煤、伊利石、纯褐煤与伊利石体系为研究对象,探索了不同电位梯度条件下褐煤煤泥水和由纯矿物配制的悬浮液的沉降性能,借助EDLVO理论及扫描电镜分析了电化学作用强化褐煤煤泥水沉降的作用机理。沉降试验结果表明:电化学作用使纯褐煤悬浮液的沉降效果恶化,使伊利石、褐煤煤泥和纯褐煤与伊利石悬浮液的沉降效果改善。EDLVO计算结果表明:电化学作用下,纯褐煤颗粒间总作用能增大,表现为吸引能减弱;伊利石、纯褐煤与伊利石颗粒间总作用能减小,表现为排斥能减弱;且三种悬浮液体系都是极性吸引能起主导作用。当电位梯度为2 V/cm时,纯褐煤与伊利石颗粒间的总作用能达到最小值,沉降效果最好。本文为实现褐煤的煤泥水高效处理提供了新思路。

In order to explore the interaction between particles in coal slime water under electrochemical action and its influence on condensation and settlement effect,first,under the condition of different potential gradient sedimentation experiment was carried out on the original coal slime and suspension,and then by coal,illite,coal and illite system as the research object,through the determination and calculation different electrochemical conditions of the coal and illite Debye length,zeta potential and surface energy parameters,with the aid of EDLVO theory for calculation,interaction energy between particles and scanning electron microscope before and after electrochemical treatment on coal and illite surface microstructure observation,the study and analysis of electrochemical mechanism.The settlement test results showed that the electrochemical action worsened the settlement effect of coal suspension and improved the settlement effect of clay suspension.The settlement effect was the best when the potential gradient was 2 V/cm for the original coal slime,coal and clay suspension,and the curve variation trend was basically the same.The results of EDLVO showed that under electrochemical action,the total interaction energy between coal particles increases,and the attraction energy decreases.The total interaction energy between illite,coal and illite particles decreased,and the repulsion energy decreased.And the three suspension systems are polar attraction can play a dominant role.The electrochemical action can obviously reduce the“energy barrier”of the total interaction energy between particles.When the potential gradient is 2 V/cm,the total interaction between coal and illite particles can reach the minimum value.The theoretical calculation results are consistent with the settlement test results,and the action mechanism of electrochemical action to promote the coalesce and settlement of lignite slime water is analyzed.