酸碱溶液对含硫尾矿砂渗透特性的影响研究

Study on the Effect of Acid and Alkali Solution on the Permeability of Sulfur-containing Tailings

为研究酸碱溶液作用下含硫尾矿砂渗透特性的变化规律,对采自辽宁阜新某尾矿库的含硫尾矿砂开展研究,测得不同p H值溶液入渗条件下尾矿砂的孔隙比、渗透系数等参数,研究了不同水化学环境条件下含硫尾矿砂渗透特性的变化规律。研究表明,经酸溶液入渗的尾矿砂在试验前24 h内,渗透系数显著增大,随着时间的增加,渗透系数逐渐降低至最小值;Na OH溶液处理后的尾矿砂渗透系数逐渐减小;经酸碱溶液入渗的尾矿砂的渗透系数均随着孔隙比的增大而逐渐增大,且各工况的渗透系数均呈现出先缓慢增长,后快速增加的变化趋势。研究成果将为尾矿坝的安全运行和稳定性分析提供重要参考价值。

In order to study the change rule of the permeability of sulphur contained tailings under acid and alkali solution, an experimental study on the tailings from a tailings reservoir in Liaoning was conducted, the variation law of the permeability under different water chemistry conditions was studied by measuring the pore ratio and permeability coefficient of the tailings.The results show that, the permeability coefficient of the tailings in acid solution increased significantly in the first 24 h of the experiment, and the permeability coefficient decreased to the minimum value with the increase of time; the permeability coefficient decreased gradually under the condition of Na OH solution; the permeability coefficient under acid and alkali solution increases gradually with the increase of void ratio, and the permeability coefficient of each working condition shows a slow growth first and then increases fast. The research results will provide important reference value for the safe operation and stability analysis of tailings dam.