CaCO 3 particles derived from limestone are obtained from quarry in Tuwiri Wetan, Tuban,
East Java and have been produced by calcination at temperature of 850° C for 6 hours and
by dissolving into water for 24 hours to result in a precipitate at the bottom and a layer
floating on the top of the lime solution. Characterization of the as received limestone with
XRF and ICP showed a very high purity. Further characterization of secondary precipitatin
using XRD showed the presence of CaCO 3 (calcite) as much as 35% and Ca (OH) 2 …