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 |
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Received: 27 February 2018; Accepted: 17 March 2018. Published online: 8 May 2018. |
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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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