煤矸石-水相互作用的溶解动力学及其环境地球化学效应研究

Kinetics of Coal Mine Spoil_Water Interaction and Environmental Impact

煤矸石—水相互作用的溶解动力学及其环境地球化学效应研究党志（中国科学院地球化学研究所，贵阳５５０００２）关键词水—岩作用煤矸石地球化学动力学采煤矿区复垦环境效应收稿日期：１９９７－３－１０作者简介：党志男１９６２年生博士生环境地球化学煤矸石以其量多、...

During the natural weathering process of coal mine spoil, the release of clay mineral is very easy and rapid. Meanwhile, the release of clay minerals from coal mine spoil is a physical process. Vast amounts of fine clay minerals are released from coal mine spoil fill into soil structure and form compact layer. In our samples heavy metals are held as sulfides, not as ions, hosted in the clay mineral lattices. Under natural weathering condition, these sulfides are unstable. As S 2- of sulfides is oxidized into SO 2- 4, the crystal lattice of sulfides break down immediately and heavy metals are liberated from coal mine spoils. Because of the adsorption of both organic compounds and colloid of iron and manganese, only little of these metals are released to the environment and much of them are remained in the weathering products. Under close experimental condition, the oxidation of sulfides containing heavy metals is a surface chemical controlled kinetic process.