水酸化カルシウムの炭酸化反応

概要

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In this study on the carbonation of calcium hydroxide, some fundamental problems in the carbonation of hydrated cement were discussed, and distinctive features in the carbonation of calcium hydroxide were examined. Several species of calcium hydroxide were carbonated with CO2 gas at a poor coexistence of water (gas reaction), or at a rich coexistence of water (liquid reaction) and examined for a rate of carbonation and for a crystallinity of calcium carbonate in the reacted layer. The results obtained are as follows:1) A rate equation of the solid state reaction presented in this study has several advantages; the equation can apply to rates of different processes successfully, and the value of n in the equation indicates the rate determing process quantitatively.2) Rates of the carbonation are differed in the gas reaction and in the liquid reaction. The water quantity coexisting in the reaction influences the crystallinity of calcium carbontae, resulting the porosity difference of reacted layer of specimens.3) Reactivity of species of calcium hydroxide depends on preparing condition and crystallinity of species, and determine the rate of reaction and species of products.4) The results on the rate equation and on the difference between gas reaction and liquid reaction obtained in this experiment, will be similarly held in carbonation of the other components of hydrated cement.
1971-03-01