수산화마그네슘의 침강속도에 미치는 반응조건의 영향 = An Effect of Reaction Conditions on the Rate of Sedimentation of Magnesium Hydroxide

다국어 초록 (Multilingual Abstract)

The rate of sedimentation of magnesium hydroxide precipitated with dolime and artificial sea water, was investigated under various reaction conditions, i.e. calcination temperature of dolomite, stoichiometric ratio of the reactants, reaction temperature and addition mode of dolime. The effect of silica adsorbed on magnesium hydroxide on the sedimentation of magnesium hydroxide was investigated also. There was little effect of calcination temperature on the sedimentation and calcium content of magnesium hydroxide. There was little effect of the stoichiometric ratio on the calcium content of the precipitates when the ratio was less than 1. But the sedimentation rate increased as the ratio changed from 0.76 to 0.84, and the rate decreased as the ratio increased further. Reaction temperature did not affect the calcium content, but affected the sedimentation rate greatly by modifying the crystal morphologies of the precipitates. And the sedimentation could be enhanced by adding dolime slurry slowly into the sea water. The relationship between the sedimentation rate and the amount of silica adsorbed on magnesium hydroxide was found to follow the equation y=-0.008+0.468x