Studi Potensi Logam Tanah Jarang dari Coal Combustion Product Sisa Pembakaran PLTU Mulut Tambang

Abstract

Coal combustion product (CCP) from the combustion of the Mine-Mouth Power Plant in Muara Enim Regency, both fly ash and bottom ash, are very large in number and have not been maximally utilized. CCP contains rare earth elements, so it is necessary to study its potential to become resources and reserves for REE in the future. The stages of this study were sample preparation and grain size distribution testing using the wet & dry sieve method. Grain morphology was observed using a microscope and determination of mineralogical content by XRD, oxide content with XRF and elemental content by ICP-MS. The grain size distribution of the coal ash is 79.72% -98.16% passing the No.200 (0.074 mm) sieve. The grain morphology is sub-rounded and there is still coal that has not been completely burned. The dominant mineral content is quartz, minor minerals such as muscovite, hematite, magnetite, pyrite, lime and periclase. The dominant oxides are SiO2, Al2O3, SO3, Fe2O3, CaO and MgO. Based on the ICP-MS test results, 16 REE elements were detected. The total content of REE for each sample, FA BB and BA BB were 263.92 ppm and 105.99 ppm, respectively. REE from the remaining CCP mine mouth power plant that has the potential to be extracted is cerium at 84.8 ppm, 42 ppm neodymium, 40.6 ppm yttrium and 33.6 ppm lanthanum from fly ash while at bottom ash only cerium is 38.1 ppm.