HWAHAK KONGHAK, Vol.25, No.6, 555-562, December, 1987
수산화마그네슘의 참강속도에 미치는 반응조건의 영향
An Effect of Reaction Conditions on the Rate of Sedimentation of Magnesium Hydroxide
초록
백운석과 인공간수를 사용하여 Mg（OH）2의 제조시 반응조건이 생성물의 침강속도에 미치는 영향에 대하여 연구하였다.
백운석의 하소온도는 침강성과 무관하지만 반응비율이 변함에 따라 생성되는 Mg（OH）2의 침강성은 변한다. 이는 반응용액중에 존재하는 silica가 Mg(OH)2 입자표면에 흡착되어 표면전하를 변화시키기 때문이라고 생각된다.
반응온도는 Mg（OH）2의 침강성에 크게 영향을 미치며, 이는 반응온도에 따라 Mg(OH)2의 결정상태가 변하기 때문이라고 믿어진다.
Dolime slurry의 첨가속도를 느리게 함으로써 Mg（OH）2의 침강성을 증가시킬 수 있었다.
생성되는 Mg（OH）2 입자표면에 흡착되는 silica의 양과 침강속도 사이에는 다음과 같은 직선관계가 성립함을 알았다.
y = -0.008+0.468x
백운석의 하소온도는 침강성과 무관하지만 반응비율이 변함에 따라 생성되는 Mg（OH）2의 침강성은 변한다. 이는 반응용액중에 존재하는 silica가 Mg(OH)2 입자표면에 흡착되어 표면전하를 변화시키기 때문이라고 생각된다.
반응온도는 Mg（OH）2의 침강성에 크게 영향을 미치며, 이는 반응온도에 따라 Mg(OH)2의 결정상태가 변하기 때문이라고 믿어진다.
Dolime slurry의 첨가속도를 느리게 함으로써 Mg（OH）2의 침강성을 증가시킬 수 있었다.
생성되는 Mg（OH）2 입자표면에 흡착되는 silica의 양과 침강속도 사이에는 다음과 같은 직선관계가 성립함을 알았다.
y = -0.008+0.468x
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.
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.