C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
57/22
C03C 11/00 (2006.01) C04B 32/00 (2006.01)
Patent
CA 1335696
Artificial pumice is produced which comprises cellular glass bodies devoid of glass crust and with rounded edges and points, and preferably having a density between about 0.2-2.0 grams per cubic centimeter and preferably having maximum size of between about 1-30 centimeters. These glass particles are relatively lightweight and are abrasive, which regular and regulatable density, mechanical strength, cell size, and an abrasivity. Particles of waste glass (e.g. of a size up to about 1 millimeter) or vitrifiable material, are mixed with a cellulating agent such as calcium carbonate. The mixture is heated, as by disposing it on an endless refractory belt which continuously passes through a kiln at a temperature of about 700°C or greater, to melt the particles, and to produce relatively small or large cellular glass bodies. The size of the large cellular glass bodies can be reduced to small bodies by sudden temperature change (e.g. quick cooling at a rate of between about 100-400°C per minute), or by mechanical action. The desired small cellular glass bodies can also be obtained by dosing the corresponding independent small portions of the mixture before the kiln process. The smaller bodies are then placed in a rotary cylinder and brought into abrasive contact with each other to remove any glass crust, dirt, etc. and round edges and points.
572455
Bereskin & Parr
Pietsch Tibor
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