Decomposition of Calcium carbonate in the presence of impurities Rachmat Triandi Tjahjanto, Dwi Nur Arifiani, Yuniar Ponco Prananto
Chemistry Department, Faculty of Mathematics and Natural Science, Brawijaya University
Abstract
Calcium oxide is often used as a carbon dioxide adsorbent to form carbonate salts. The formed calcium carbonate can be recycled into calcium oxide through a calcination process at a temperature of 900 degree Celcius. Impure calcium compounds may contain magnesium, silica and alumina. This study aims to determine the effect of impurities on the recycling heating temperature and the reactivity of the resulting calcium oxide product. Three samples were prepared, namely C1 consisting of 14% \( \tt SiO_{2}\) and 86% \( \tt CaCO_{3}\), C2 consisting of 5% \( \tt Al_{2}O_{3}\) and 95% \( \tt CaCO_{3}\), and C3 consisting of 14% \( \tt SiO_{2}\), 5% \( \tt Al_{2}O_{3}\) and 81% \( \tt CaCO_{3}\). The percentages used are based on the composition found in natural limestone. Decomposition analysis was carried out using the DTG instrument and the initial and final compositions were analyzed using the XRF instrument. The results obtained indicate that the decomposition temperature is affected by the presence of impurities, and the reactivity of calcium oxide is not affected by the presence of impurities.
