Identification of Phase CaCO_3/MgO in Bangkalan Dolomite Sand as An Antibacterial Substance

摘要

Dolomite sand has several ingredients such as CaCO_3 and MgO which have the potential as an antibacterial substance. The making of this antibacterial substance uses the heating/calcination method of dolomite powder with a variation of holding time from 0.5 to 2.5 hours at a temperature of 700°C. The nanoparticles produced from the calcination process were then characterized by XRD to identify the formed phase. This study aimed to determine the effect of holding time on phase formation on dolomite. The results of this study are identified as forming four phases namely calcite (CaCO_3), periclase (MgO), calcium hydroxide (Ca(OH)_2) and lime (CaO) with different percentages in each variation of holding time. The Ca(OH)_2 and CaO phases include the impurity phase with a lower percentage than the CaCO_3 and MgO phase percentages. The most dominant phase is CaCO_3 and the MgO phase formed optimally at 1 hour holding time with a percentage of 47.1% CaCO_3 and 35.9% MgO.