Metallurgical and Materials Transactions B
The reduction of stannic oxide with carbon
Journal Metallurgical and Materials Transactions B
Publisher Springer Boston
ISSN 1073-5615 (Print) 1543-1916 (Online)
Issue Volume 10, Number 1 / March, 1979
DOI 10.1007/BF02653980
Pages 109-115
Subject Collection Chemistry and Materials Science
SpringerLink Date Wednesday, July 18, 2007
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The reduction of stannic oxide with carbon
Rafael Padilla1 and H. Y. Sohn2
(1) Universidad Tecnica de Oruro, Oruro, Bolivia
(2) Department of Metallurgy and Metallurgical Engineering, University of Utah, 84112 Salt Lake City, UT
Received: 17 February 1978
Abstract The rate of reduction of stannic oxide (cassiterite) with carbonaceous materials was investigated in the temperature range 1073 to 1273 K, using thermogravimetic analysis. The effects of the type, the particle size, and the relative amount of carbon were studied. The results indicate that cassiterite is reduced directly to Sn proceeding through the gaseous intermediates of CO and CO2. The overall rate of reduction is controlled by the oxidation of carbon by CO2 ·
An energy of activation of 220.9 kj/mole (52.8 kcal/mole) was calculated for the reduction of SnO2 with coconut charcoal within the temperature range 1073 to 1173 K and 323.8 kjJ.mole (77.4 kcalJ.mole) with graphite within the temperature range 1198 to 1273 K.
A direct comparison was made between the rate of oxidation of coconut charcoal in CO2- CO mixtures and the rate of reduction of SnO2 with coconut charcoal, which are not in agreement. The reason for this disagreement was found to be the catalytic action of the tin formed during the reduction.
