煤矸石中铅、铬、镉的溶出性能

Dissolution characteristics of Pb,Cr,Cd from coal gangue

以滕南煤田某煤矿风化煤矸石为研究对象,应用主成分分析法分析了煤矸石粒径对Pb,Cr,Cd溶出浓度的影响,应用回归分析法分析了浸溶时间与Pb,Cr,Cd溶出浓度的关系特征。实验结果表明:模拟湿地浸溶条件下,煤矸石中Pb,Cd,Cr溶出浓度均超出或接近Ⅲ类水体水质标准,对水环境存在污染风险;煤矸石粒径对Pb,Cd,Cr溶出浓度存在影响,粒径越小则Pb、Cr、Cd溶出浓度越大,粒径小于8.0 cm的煤矸石浸溶贡献较大。建立了表征Pb,Cr,Cd溶出浓度与浸溶时间对数(以10为底)关系的一元三次多项式回归方程,经检验均具有显著性。

The weathered coal gangue from Tengnan Mining area was taken as the research object in this paper.The effect of particle size of coal gangue on dissolution concentration of Pb,Cr,Cd was analyzed by principle component analysis method,and the relationship between leaching time and dissolution concentration of Pb,Cr,Cd was studied by regression analysis method.The experimental results show that:Under the simulated wetland leaching conditions,the dissolution concentration of Pb,Cd,and Cr in coal gangue all exceedes or approaches the quality standards of ClassⅢwater bodies,and there is a risk of water pollution;The particle size of coal gangue affects the dissolution concentration of Pb,Cd,Cr that dissolution concentrations increases as the decreasing of particle size,and for dissolution concentration of Pb,Cr,Cd,coal gangues with the size smaller than 8.0 cm play more parts.The univariate cubic polynomial regression characteristic equations are constructed to show the relationship between dissolution concentration and logarithm of leaching time(based on 10)of Pb,Cr and Cd,and the test result show that the equations are significant.