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1916-2016

The influence of the size of raw materials on the rate of melting of glass V3 117-123

The influence of the size of raw materials on the rate of melting of glass V3 117-123

It is suggested that the batch free time (0) of a melt can be written 0=08+0, where Oi is an intensive term depending only on the physical and chemical nature of the batch whilst 0e is another term allowing for bulk effects such as the size of the batch. Experiments were made to observe the melting behaviour of 0-03 g samples of sheet glass batch, thus approaching the condition 0=0&. The size of the sand grains had an important effect on melting, the batch-free time decreasing and homogeneity increasing (according to Nomarsky interferograms) as the sand grain size decreased. For melts made with narrow particle size ranges it was possible to relate batch-free time directly to specific surface but further experiments with sands containing particles of greatly differing sizes showed that it was in general necessary to specify both surface area and size distribution. Compaction of the batch or moistening the batch had no effect on batch-free time, nor did the size of limestone or dolomite grains, unless they were much larger than the sand grains.

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