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We design a novel method for the CH 4  reduction of SnO 2  for the efficient recovery of Sn from SnO 2  through a study combining theory and experiment. The atomic-level process of CH 4 -SnO 2  interaction and temperature-dependent reduction behavior of SnO 2  were studied with a combination of a multi-scale computational method of thermodynamic simulations and density functional theory (DFT) calculations. We found that CH 4  was a highly efficient and a versatile reducing agent, as the total reducing power of CH 4  originates from the carbon and hydrogen of CH 4 , which sequentially reduce SnO 2 . Moreover, as a result of the CH 4  reduction of SnO 2 , a mixture of CO and H 2  was produced as a gas-phase product (syngas). The relative molar ratio of the produced gas-phase product was controllable by the reduction temperature and the amount of supplied CH 4 . The laboratory-scale experimental study confirmed that CH 4  actively reduces SnO 2 , producing 99.34% high-purity Sn and H 2  and CO. Our results present a novel method for an efficient, green, and economical recycling strategy for Sn with economic value added that is held by the co-produced clean energy source (syngas).

Design of Reduction Process of SnO2 by CH4 for Efficient Sn Recovery