| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1992: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1991: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Research Abstract |
Reactive crystallization tests were done batch-wisely, to examine the effect of l-aspartic acid and l-glycine on the crystallization rate. From the results, effect of them was recognized not to be significant in comparison to the effect of crystallization operation factors. Then studies on reactive crystallization were carried out to obtain the effect of supersaturation, the rate of its formation, temperature and mixing on the shape of calcium carbonate crystals. Based on the results of above studies, direct mixing of calcium salt and carbonate sollution was applied to calcium carbonate crystallization under normal temperature and pressure, to recognize that solid sodium chloride addition was effective to form calciteselectively, althogh vaterite crystallized much without its addition. And also method of addition, reactant concentration affected crystal shape and size distribution. Consequently new phenomena that unstale microfines were transformed selectively to calcite by dissolution of sodium chloride surface, was found, and growth rate of calcite was obtained. This study could be located as a germic reserach, and it will contribute not only to the new process development of carbon dioxide flxation by calcium carbonate crystallization,
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