国外尾矿酸性排水和重金属淋滤作用研究进展

尾矿引起的环境问题是水 气 矿物在地表条件下发生复杂反应的综合结果。近年来 ,国外学者研究显示 ,发生在尾矿中的风化作用不仅仅有硫化物的氧化作用 ,而且还伴随有机物氧化作用 ,碳酸盐等矿物中和作用 ,次生矿物沉淀作用、结晶作用、胶结作用 ,矿物交代蚀变作用、吸附作用、离子交换作用以及生物作用。上述各种作用互相影响 ,互相制约。目前 ,最新研究表明 ,许多因素都会影响尾矿风化作用 ,这些因素主要包括 :尾矿原生矿物组成、成因、化学成分、表面积和形态 ;尾矿酸中和潜力 ;溶液pH值 ;次生矿物形成及其吸附、离子交换、胶结作用 ;溶液中Fe3+离子的浓度 ;有机物的种类和含量 ;尾矿粒度分布和空隙度 ;气候条件和尾矿的水文地质环境

The research progress on the acid drainage and heavy metal leaching of foreign mine tailings

Environmental problems caused by mine tailings are the integrative results of complex reaction between water atmosphere minerals under surface conditions. In recent years, study of foreign scholars indicates that weathering occurring in mine tailings is not only oxidation but also neutralization, deposition, crystallization, cementation, adsorption, ion exchange, biology action. All of the actions interact and restrict each other. The latest research progress indicates that many factors can affect weathering of mine tailings. The factors include composition, genetic, chemical composition, surface area, and shape of primary minerals; acid neutralization potential of mine tailings; pH value and Fe 3+ concentration in solution; form, adsorption, ion exchange, and cementation of secondary minerals; type and concentration of organics in mine tailings; grain size distribution and interstice percent; climate and hydrogeological environment; action between bacteria and tailings.