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The action of arsenic as a refining agent V11 48-53

The action of arsenic as a refining agent V11 48-53

Experiments have been made in which carbon dioxide bubbles were formed in melts of soda-lime-silica glass. After different times at 1200" C these melts were quenched and annealed. Bubbles in melts containing no arsenic decreased slightly in size and became slightly enriched in oxygen. When the melt contained 0.1% As203 the bubbles decreased in size much more rapidly and also became very rich in oxygen. Carbon dioxide originally in the bubbles dissolved in the melt faster than oxygen diffused into the bubbles. It is suggested that the main function of arsenic in refining may be to enable the melt to absorb rapidly the carbon dioxide initially present in the bubbles.


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