Font Size: 

Synthesis nanocalcite made of limestone using coprecipitation method has been succesfully implemented. Synthesis is held by variyng the CO₂ gas pressure and precipitation time inorder to obtain calcite with high purity and small particle size. Diffraction data were collected using a X-ray diffractometer, which then analyzed using software Match and Rietica to obtain information about fitness, degree of purity, density and particle size. From analysis using Match, it was found that limestone as base material has CaCO₃ and Ca(OH)₂ phases, while samples which synthesized by coprecipitation method has calcite phase. Analysis result by Rietica shows that the best result is sample which synthesized with CO₂ gas pressure variation of 37.5 kgf/cm³ and the settling time for 36 hours.

limestone, calcite, coprecipitation, purity