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Crystals of artificial cassiterite

Published online by Cambridge University Press:  14 March 2018

J. J. Frankel
J. J. Frankel*
Affiliation:
University of the Witwatersrand, Johannesburg, South Africa
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Extract

The crystals of artificial cassiterite, described below, were produced by volatilization of South African low-grade tin ores. In the sinter-pot method employed, air was blown through a charge of alternate layers of coke and of a 12 % metallic tin concentrate mixed with fine coke. This charge was placed above a basal layer of previously ignited coal. Occasionally sodium chloride was mixed with the concentrate to remove tin as chloride as well as oxide fume. The air-flow was carefully controlled to prevent slagging and was maintained until the evolution of copious fumes of tin oxide, and at times of chloride, ceased.

Optical pyrometer readings on the charges during the experiments gave temperatures of 1050°C. approximately, but it is certain that this value is a grave under-estimate of the actual temperatures in the interior of the sinter-pot.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 28 , Issue 197 , June 1947 , pp. 111 - 117
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1947

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