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RELEASE MECHANISM OF SULPHUR BEARING MINERALS IN SOUTH AFRICAN COAL SAMPLES DURING THE INITIAL COMBUSTION STAGE
Abstract
Coals, being heterogeneous matter in general have very complex composition. In South Africa, coal is mainly utilized for electricity generation followed by metallurgical and industrial usages. During the combustion of coal as the main utilization process, there are different chemical components released and these have been found to be the cause of many challenges of using coal for fuel. Out of many challenges of coal utilization, there is the release of SOx, NOx and other harmful minerals, which are highly attributed to health and environmental problems. Different SOx scrubbing and capturing techniques employed only focus on the gaseous products while the solid products are used in other industries or dumped with the discards which when in contact with other minerals and water they leach out and this poses a danger to the environment. The current research explored the different Sulphur bearing mineral compositions released in the initial combustion stages, where it was observed that there is an abundance of such minerals although their release mechanics differ from one sample to the other. The studies of the predetermined five samples were combusted at different temperatures and quantitative XRD analyses of the original and the ash produced conducted. Focus was on the Sulphur bearing minerals detected in the analyzed samples. The results from this work can be useful as predictive analyses of different Sulphur bearing coals concerning ash and other waste production potential. Moreover, the potential impact of waste disposal would be determined and addressed accordingly.
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