Production of Colourless Glass in Tank Furnaces with Reference to Use of Selenium JSGT_V07_T309-T324
When we consider the different constituents of the batch we find considerable differences in the amount of selenium retained. The actual percentages are stated in the tables, and on comparison it becomes clear why the salt-cake-containing batches needed distinctly more selenium for decolorising than those containing soda ash alone. It was clearly due to the much greater volatilisation of selenium, leaving so small an amount behind as to be ineffective, under some conditions, for decolorising and being insufficient also to develop the yellow colour by prolonged heating. It was noticed in our own small scale melting that the rise and fall of the batch during the melting process seemed to be rather more prolonged when salt-cake was present, a fact which would be favourable to the escape of selenium.
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