黄铁矿表面溶解——不容忽视的研究领域

Dissolution of pyrite: an important study subject

矿物表面反应存在于结晶、溶解、成岩成矿、蚀变和风化等一系列地质过程中,在环境科学和材料科学也有着重要的应用,因此,表面矿物学已成为国际地学研究的热点。本文概括了近年来黄铁矿等硫化物表面反应的研究进展,指出了黄铁矿的表面溶解研究存在的问题,并重点阐述了黄铁矿表面溶解研究在诸多方面的重要意义,包括黄铁矿表面溶解研究的理论意义、黄铁矿的表面溶解对矿山环境评价的意义、尾矿堆中绝大多数黄铁矿处于酸性还原环境、黄铁矿表面溶解控制着海洋中硫的循环。本文还报道了笔者通过实验所获得的黄铁矿溶解反应动力学的初步研究结果。

Being important in such geological processes as crystallization, dissolution, alteration, mineralization and weathering and applied widely to environmental science and material science, the surface reaction of minerals has recently become a geological focus in the world. Based on analyzing the research advances in surface reaction of sulfide minerals, this paper points out that there are problems which have not yet been solved in the study of pyrite dissolution. However, pyrite dissolution is of great significance in many fields such as （1） the theoretical importance （e. g., how is S2^2- transformed into S^2-？ How are the charges balanced when S^2- is transformed into S^2-）, （2） the significance in evaluating mining environment, （3） the phenomenon that most of pyrite in tailing is under the reductive acidic condition, and （4） the control of the dissolution of pyrite over the cycle of sulfur in the ocean. Furthermore, the primary kinetic results from the experiment of pyrite dissolution are also reported in this paper.