Dissolution Characteristics of Limestone in Laboratory Experiments
Dissolution Characteristics of Limestone in Laboratory Experiments
复制标题
室内实验中石灰石的溶解特性
DOI：
10.5026/jgeography.115.2_136
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发表时间：
2006
影响因子：
3.1
通讯作者：
Y. Matsukura
中科院分区：
文献类型：
--
作者：
Yasuhiko Takaya;Yasuhiko Takaya;T. Hirose;H. Aoki;Y. Matsukura
为阐明影响石灰石溶解特性的一些因素，在间歇(封闭)系统中进行了三个实验室实验的结果：实验A：用蒸馏水在不同固液比(0.25、0.5和1)下处理石灰石，时间为960小时(40天)。实验B：用蒸馏水(50.0mL)处理粘土粒度粉状样品(1.00g重量)或块状样品(3.54×3.54×20mm3)417小时(约17天)；实验C：用蒸馏水(250.0毫升)在不同温度(5、50和75℃)下处理块状样品2164小时(约90天)。实验结果表明：(1)粉碎样品的表面积和温度对溶解速率的影响小于固液比；(2)反应初期的溶解速率受岩石物理性质(孔隙度)和水温的影响；(3)初始阶段的速率决定步骤是一个传质过程(如离子在溶液中的扩散)。因此，石灰岩的持续溶解对于促进溶解物质的运移是必要的。换句话说，它的一个条件是通过在间歇(封闭)系统实验中搅拌溶液，将相对于碳酸盐矿物不饱和的水送到岩石表面。
The results of three laboratory experiments in a batch (closed) system were reexamined to elucidate the influence of some factors related to the dissolution characteristics of limestone;Experiment A : an experiment in which the samples (200 g in weight) crushed to fragments with three kinds of grain size (coarse : a diameter of 45-32 mm; medium : 16-8 mm; and fine : 2-1 mm) were treated with distilled water under various solid/liquid ratios (0.25, 0.5, and 1) over 960 hrs (40 days); Experiment B : an experiment in which clay-size powder sample (1.00 g in weight) or a block sample (3.54×3.54×20 mm3) was treated with distilled water (50.0 mL) over 417 hrs (ca. 17 days); Experiment C : an experiment in which a block sample (5.0×5.0×40.0 mm3) was treated with distilled water (250.0 mL) at various temperatures (5, 50, and 75°C) over 2164 hrs (ca. 90 days). Electric conductivity (EC) of aqueous solution, as an index of solute concentration, was measured.Experimental results showed that (1) surface area of crushed samples and temperature influence the dissolution rate less than solid/liquid ratio, (2) the dissolution rates at the initial stage of reaction are influenced by both physical property of rock (porosity) and water temperature, and (3) the rate-determining step at the initial stage is a mass transport process (e.g., diffusion of ions in solution). Therefore, it is necessary for the continuous dissolution of limestone to prompt the transport of dissolved materials. In other words, a condition for it is to send water undersaturated with respect to carbonate minerals into the rock surface by stirring a solution in a batch (closed) system experiment.
影响因子：
2.9
作者：
S. Nakashima
通讯作者：
S. Nakashima