Effect of calcite in the production of precipitated calcium carbonate
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Date
2019-05
Authors
Arvindhra Rao A/L Kriohnamurthy
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Abstract
This research work was done on limestone and calcite samples to produce and characterize precipitated calcium carbonate in order to observe the effect of calcite in the production of precipitated calcium carbonate (PCC). The phases of work involved in producing precipitated calcium carbonate include physical processing of the raw sample, calcination, slaking of lime and carbonation. The operating parameters in this research work are type of sample and the temperature used in carbonation process to produce PCC. The temperatures used in the carbonation are 40⁰ C, 60⁰ C, 80⁰ C and 100⁰ C. The analysis done on the PCC produced includes SEM analysis, EDX analysis, XRD analysis and particle size analysis. These analysis and other data are essential in obtaining the morphology, elemental analysis, the phases present in the PCC and the particle size analysis. As the temperature increases, the particle size analysis shows that the PCC produced from the limestone sample is much finer compared to the calcite sample at all temperatures. The SEM morphology and XRD analysis both shows the presence of vaterite and calcite crystals at lower temperatures but as temperature increases, calcite becomes dominant and vaterite becomes insignificant. The EDX analysis shows that the limestone PCC produced is more stable compared to the calcite PCC. The effect of calcite on the production of precipitated calcium carbonate is that the PCC produced is more unstable compared to the limestone PCC and produces coarser size range of PCC which will increase the energy consumption and he production cost in the industry. This could be the reason why calcite is not being used in production of PCC in Lime & Lime Products Sdn.Bhd.