2007 Volume 14 Issue 330 Pages 281-286
This paper was made to investigate synthesis of hexagonal plate like calcium hydroxide by suspending gypsum dihydrate in potassium hydroxide solution. The calcium hydroxide was synthesized easily by suspending gypsum dihydrate in potassium hydroxide solution. The product was characterized by means of X-ray diffraction, thermal analysis (TG-DTA) and scanning electron microscopy.
The single phase of calcium hydroxide was obtained above OH/Ca molar ratio of 2.6. The reaction time which was obtained single phase of calcium hydroxide from gypsum dihydrate was approximately 15 minutes. The shape of calcium hydroxide was hexagonal plate. This particle size of calcium hydroxide was controllable by OH/Ca molar ratio in the range of 0.5-5μm. The formation of calcium hydroxide was hardly influenced by suspension concentration.
