Iranian Journal of Materials Science and Engineering

en EFFECTOFTHE TYPE OFCARBON MATERIALON THE REDUCTION KINETICS OFBARIUM SULFATE Research Paper Research Paper Abstract: the reduction agent. Pellets of barite ore containing about 95% BaSOtemperature, time, ore grain size and the type and grain size of the carbon materials. Graphite, coke and charcoal havebeen used as the reducing agent and the reduction experiments have been performed in the temperature range of 925-1150 °C. Apart from conducting the experiments using pellets made of ore powder, kinetic analysis of the experimentaldata by use of the reduced (dimensionless) time method has been another unique feature of the present study.Experimental results show that grain size of either carbon material or barite ore has not appreciable effect on thereaction rate. Kinetic analysis of the experimental data revealed the rate is strongly controlled by the chemical reactionof carbon gasification (Boudouard reaction). The reaction rate is very considerably related to the type of carbonmaterial so that the activation energy varies from 15.6 kcal.molkcal.molgasification.The present study deals with the reduction of barium sulfate (Barite) to barium sulfide by use of carbon as4 has been reduced under different conditions of-1 for charcoal to 26.3 kcal.mol-1 for graphite and 20.8-1 for coke. This behavior provides further support for the postulated reaction mechanism, i.e., carbon Keywords: Barite, carbothermic reduction, kinetic analysis, carbon gasification, activation energy. 1 7 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-3-150&slc_lang=en&sid=1 M. Sh. Bafghi * msbafghi@iust.ac.ir 180031947532846001226 180031947532846001226 Yes 1 School of Metallurgy and Materials Engineering, Iran University of Science & Technology, Tehran, Iran. A. Yarahmadi 180031947532846001227 180031947532846001227 No 2 Department of Mining Engineering, Faculty of Engineering, Yazd University, Yazd, Iran. A. Ahmadi 180031947532846001228 180031947532846001228 No 3 School of Metallurgy and Materials Engineering, Iran University of Science & Technology, Tehran, Iran. H. Mehrjoo 180031947532846001229 180031947532846001229 No 3 School of Metallurgy and Materials Engineering, Iran University of Science & Technology, Tehran, Iran.