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Hydrothermal Alteration Zoning and Kinetic Process of Mineral-Water Interactions

Acta Geologica Sinica(English Edition) 2002年第3期76卷 351-366页

作者：张荣华胡书敏苏艳丰 Open Research Laboratory of Geochemical Kinetics Institute of Mineral ResourcesChinese Academy of Geological Sciences 26 Baiwanzhuang Road Beijing 100037 China

This study reports the kinetic experimental results of albite in water and inKCl solution at 22 MPa in the temperature range of 25 to 400 deg C. Kinetic experiments have beencarried out in an open flow-through reaction system (packed bed reactor). Albite dissolution isalways incongruent in water at most temperatures, but becomes congruent at 300 deg C (close to thecritical point 374 deg C). At temperatures from 25 to 300 deg C, the incongruent dissolution ofalbite is reflected by the fact that sodium and aluminum are easily dissolved into water; from 300to 400 deg C it is reflected by silicon being more easily dissolved in water than Al and Na. Maximumalbite dissolution rates in the flow hydrothermal systems have been repeatedly observed at 300 degC, independent of flow rates. The kinetic experiments of albite dissolution in a KCl aqueoussolution (0.1 mol KCl) indicate that the dissolution rate of albite increases with increasingtemperature. Maximum silicon release rates of albite have been observed at 400 deg C, while maximumaluminum release rates of albite at 374 deg C. The reaction rates of albite also depend on thepotassium concentration in the aqueous solution. These results can be used to interpret themechanism for forming hydrothermal alteration. The kinetic experiments of mineral-aqueous solutionsinteractions in the hydrothermal system from 25 to 400 deg C and at 22 MPa indicate that theformation of the feldspar-mica-kaolinite zoning occurring in some ore deposits may depend not onlyon the mineral stability but also on the kinetics of feldspar hydration, which is affected by thewater property variation when crossing the critical point.

关键词： albite dissolution reaction rate incongruent dissolution criticalpoint

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Mechanisms of surface charge development of serpentine mineral

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Transactions of Nonferrous Metals Society of China 2013年第4期23卷 1123-1128页

作者：冯博卢毅屏冯其明丁鹏罗娜中南大学资源加工与生物工程学院长沙410083

The electrokinetic behavior and surface dissolution of serpentine mineral were studied through Zeta potential measurements, dissolution experiments and X-ray photoelectron spectroscopy. The results show that serpentine has an iso-electric point （IEP） of 11.9, which is higher than that of other phyllosilicate minerals. dissolution experiments show that the hydroxyl is easy to dissolve with respect to the magnesium cations in the magnesium oxide octahedral sheet. As a result of hydroxyl dissolution, the magnesium ions are left on serpentine surface, which is responsible for serpentine surface charge. The removal of magnesium ions from serpentine surface by acid leaching results in a decrease of serpentine IEP. Therefore, it has been clearly established that the surface charge developed at the serpentine/aqueous electrical interface is a function of the serpentine surface incongruent dissolution.

关键词： serpentine magnesium ions hydroxyl surface charge incongruent dissolution

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