电场对尾矿浸出过程中溶质迁移规律的影响

来源期刊:中南大学学报(自然科学版)2021年第2期

论文作者:吴爱祥 王少勇 尹升华 陈勋

文章页码:535 - 543

关键词:直流电场;尾矿堆浸;电场强度;溶质迁移

Key words:DC electric field; tailings heap leaching; electric field strength; solute transport

摘    要:为探究外加直流电场对堆浸过程溶质迁移规律的影响,利用标记物穿透曲线法,以Na+为示踪剂,进行尾矿堆浸体系溶质运移管柱实验。研究结果表明:电场作用加快了浸出体系被溶质穿透的进程;施加电场后浸柱各高度尾矿样中的Na+质量浓度明显增大,同时,尾矿样中Na+质量浓度随着电场强度的增大而增大;在浸柱高度方向上,Na+质量浓度随深度的增加而减小,外加电场可改善溶质在浸柱内的均匀性,均匀程度随电场强度的增大而增强;浸柱内溶质迁移速率随电场强度的增加而增大,两者呈线性关系。电迁移是电场作用下溶质迁移最主要作用机理,决定迁移速度的因素有离子质量浓度、电场强度、离子电荷数、温度、体系孔隙率和孔隙连通性。

Abstract: To explore the effect of DC electric field on the solute transport in heap leaching system, column experiment on the solute transportation was conducted by adopting marker breakthrough curve method with Na+ as tracer. The results show that the electric field can speed up the process of solute breakthrough leaching column. The Na+ mass concentration in each height of the leaching column is significantly increased when electric field was applied, and the Na+ mass concentration in tailings will increase with the increase of electric field intensity. The Na+ mass concentration in tailings decreased with the increase of its location depth in column, but the electric field can improve the homogeneity of the solute in column. The uniformity of the solute distribution increases with the increase of electric field intensity. The solute transport rate also increases with the increase of electric field intensity and the relationship is approximately linear. Electro-migration is the main mechanism of solute migration in electric field, The factors that determine the migration rate are ion concentration, electric field strength, ionic charge, temperature, system porosity and pore connectivity.

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