結晶種添加法による缶石附着防止について (第3報):かん水中に於ける石膏の転移の際の溶解及び析出速度に関する研究

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As a fundamental item for the method "addition of crystal seeds", having studied the change of Ca concentration during transition of calcium sulfate in the brine, we calculated the velocities of dissolution and crystallisation during transition, moreover researched certain factors which effected to the velocities. Following conclusions were obtained. (1) With increase of calcium sulfate suspended in the brine, velocity of dissolution has increased, but that of crystallisation has been unchanged. There may be, however, a constant value which does not increase the velocity by more addition. (2) Concentration of the brine has greatly effected to both velocities by the change of Ca concentration and velocity constant K. (3) The smaller is particle size, the more rapidly reaction goes, but we can not gain the definite connections between them. (4) With elevation of temperature, reaction velocity should be increased, but when saturation degree of Ca decreases, velocity has a max. value at a temperature, and decrease at higher or lower temperature than the point. (5) With increase of stirring velocity, the thickness of diffusion layer δ decreases, therefore K increases, but the latest may not increase more than a constant value.
日本海水学会の論文