地质学报（英文版）2000，Vol.74Issue(2)：406-411,6.
Mineral Surface after Reaction with Aqueous Solution at High Temperatures and Pressures
Mineral Surface after Reaction with Aqueous Solution at High Temperatures and Pressures
摘要
Abstract
This work presents new experimental results on surface chemistry of reacting minerals and interface kinetics between mineral and aqueous solutions. These experiments were carried out using a flow reactor (packed bed reactor) of an open system as well as a continuous stirred tank reactor, CSTR. The authors measured reaction rates of such minerals as zeolite, albite and carbonate (rhodochrosite, dolomite) in various solutions, and tested corresponding mineral surface by using SEM, XPS, SIMS, etc. This paper mainly presents the experimental results of zeolite dissolution in water and in low pH solutions at room temperature, and dolomite dissolution at elevated temperatures. The results show that the release rates of Si, Al and Na of zeolite are different in most cases. The incongruent dissolution of zeolite is related to surface chemical modifications. The Na, Al and Si release rates for dissolution of albite and zeolite in water and various solutions were measured as a function of temperature, flow velocity, pH and solution composition in the reaction system. In most cases, dissolutions of both albite and zeolite are incongruent. Dissolution of dolomite is also incongruent in most cases and varied with T, pH, and nature of aqueous solutions. For dolomite dissolution, the release rates of Mg are less than those of Ca at high temperatures as T increases from 25 to 300° C. SIMS study indicates that the contents of Al, Na and Si in the leached layer of zeolite or albite surface, change with the distance from the surface, exhibiting a non-linear behaviour within a thickness range of 1000%. The distributions of Ca, Mg, Mn, H and Cl in the leached surface layer of carbonate have a non-linear behaviour too.关键词
mineral surface/kinetics/liquid/solid interface/reactionKey words
mineral surface/kinetics/liquid/solid interface/reaction分类
天文与地球科学引用本文复制引用
..Mineral Surface after Reaction with Aqueous Solution at High Temperatures and Pressures[J].地质学报（英文版）,2000,74(2):406-411,6.基金项目
The experimental results presented in this paper were carried out with the financial support of GTB basic research 9501115, "Climbing project" 95- pre-39, and the National Science Foundation of China (Grant No. 29673008. We also thank Ms Su Yanfeng for her work in the laboratory. （）
