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

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We design a novel method for the CH4 reduction of SnO2 for the efficient recovery of Sn from SnO2 through a study combining theory and experiment. The atomic-level process of CH4-SnO2 interaction and temperature-dependent reduction behavior of SnO2 were studied with a combination of a multiscale computational method of thermodynamic simulations and density functional theory (DFT) calculations. We found that CH4 was a highly efficient and a versatile reducing agent, as the total reducing power of CH4 originates from the carbon and hydrogen of CH4, which sequentially reduce SnO2. Moreover, as a result of the CH4 reduction of SnO2, a mixture of CO and H-2 was produced as a gasphase product (syngas). The relative molar ratio of the produced gas-phase product was controllable by the reduction temperature and the amount of supplied CH4. The laboratory-scale experimental study confirmed that CH4 actively reduces SnO2, 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).
Publisher
NATURE PUBLISHING GROUP
Issue Date
2017-10
Language
English
Article Type
Article
Keywords

ZINC-OXIDE REDUCTION; INDIUM-TIN-OXIDE; PYROMETALLURGICAL METHOD; THERMODYNAMIC ANALYSIS; SYNTHESIS GAS; THIN-FILMS; METHANE; METAL; CARBON; IRON

Citation

SCIENTIFIC REPORTS, v.7

ISSN
2045-2322
DOI
10.1038/s41598-017-14826-7
URI
http://hdl.handle.net/10203/240054
Appears in Collection
RIMS Journal Papers
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