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An Experimental Study of Limestone Dissolution at High Temperature and High Pressure in Liquid-Flow Reaction Set

Author: XuWei
Tutor: GongQingJie
School: Chinese Geology University (Beijing)
Course: Geochemistry
Keywords: limestone high temperature high pressure water-rock kinetics
CLC: P641.3
Type: Master's thesis
Year: 2006
Downloads: 98
Quote: 1
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Abstract


Rock-water reaction plays an important role in many aspects of geology science. Scientists spend a lot on studying dissolution kinetics . It is a hot spot. Limestone covers nearly 15% of the whole area of earth surface.In this paper we studied the solubility of limestone in HCl-H2O system respectively at 250℃、300℃、350℃、400℃at a stable pressure of 25 MPa . They are 24.12、65.07、60.84、53.21 mg/l. The experimental study thus indicates that it is a rapid process that limestone dissolutes in HCl-H2O system. On the base of this, we then changed HCl-H2O into NaCl-H2O system of 0.6mol/ to determine the limestone dissolution kinetics at 50℃、100℃、150℃、200℃、250℃、300℃、350℃、400℃、450℃、500℃of 25 MPa . The experimental study thus indicates the process of limestone dissolution in NaCl-H2O system is regularity. When temperature is not changed , the concentration of Ca2+ decrease with the increase of the velocity of flow in a nilpotent way. The rate constant and the reaction progression are different at different temperature. The rate constant increase with the increasing of the temperature blow 300℃which is the highest, than it is fall. These dates are very important . It is necessary in uncovering and solving some relative geological matters.

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CLC: > Astronomy,Earth Sciences > Geology > Hydrogeology and Engineering Geology > Hydrogeology (groundwater hydrology ) > Hydrogeochemical
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