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Korean Journal of Metals and Materials > Volume 56(5); 2018 > Article
Korean Journal of Metals and Materials 2018;56(5): 384-391. doi: https://doi.org/10.3365/KJMM.2018.56.5.384
Modification of the Amount of CH4 Supplied for the Efficient CH4 Reduction of SnO2
Taeyang Han1, Youhan Sohn1, Hyunwoo Ha1, Mi Yoo1, Sangyeol Kim2, Sang-ro Lee2, Hyun You Kim1, Jun Hyun Han1
1Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
2A1 Engineering Co. Ltd., Suncheon 58034, Republic of Korea
Correspondence  Hyun You Kim ,Tel: +82-42-821-5632, Email: kimhy@cnu.ac.kr
Jun Hyun Han ,Tel: +82-42-821-5633, Email: jhhan@cnu.ac.kr
Received: 27 February 2018;  Accepted: 17 March 2018.  Published online: 8 May 2018.
ABSTRACT
The methane reduction (MR) of SnO2 has been proposed as a highly efficient method for recovering Sn from SnO2 containing industrial wastes. The MR of SnO2 also produces a mixture of H2 and CO, which can be further utilized as a syngas for the production of various fuels through the Fisher-Tropsch process. To optimize the process parameters, we studied the effect of the amount of supplied CH4 (CH4/SnO2 molar ratios of 1, 3, or 5) on the recovery of Sn from SnO2 and the H2/CO ratio in the produced gas. Through a combination of thermodynamic simulation and experimental confirmation, we found that the recovery rate of Sn, and the molar ratio of H2/CO in the product gas, increased as a function of the supplied-CH4/SnO2 ratio. We found that the recovery of Sn increased as a function of supplied-CH4 (95.5% at CH4/SnO2=5) however, the purity of Sn was consistent for all studied samples (~99.90%). Our results confirm that 3N quality highpurity Sn can be easily recovered from SnO2 containing industrial wastes by direct solid-gas reduction.
Keywords: SnO2, CH4, reduction, syngas, thermodynamic simulation, recovery rate
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