The reliability of an industrial frequency crucible (IFC) induction furnace, used in casting manufacture, depends on its lining life. For this reason quartzite as the cheapest acid lining material is the subject of considerable research work both in our country and overseas. The aim of the present research is development of manufacturing technology and operation of an acid lining that is used for melting alloys and with melt operating temperatures above 1450°C. The action of melt thermal regimes on the change in interplanar distances within the quartzite structure affecting furnace lining life is studied.

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Effect of Melting Temperature Regimes on Change of Interplanar Distance in Quartzite

Monolithic Crown and its Benefits, Colloidal Silica Bonded Refractories Technology

The critical parameters of silica refractories, such as compressive strength,
 bulk, density, quantity of silica, microstructure and porosity were evaluated
 of unused and used bricks to line the crowns of glass furnaces, when the rate
 of corrosion of crowns were about 2 times greater. The change of these
 parameters, the chemical composition and formation of the microcracks in the
 used silica refractories material were studied. It was established that the
 short time at service of container glass furnace crown can be related to low
 quality of silica brick: high quantity of CaO and impurities, low quantity of
 silica, low quantity of silica, transferred to tridymite and cristobalite and
 formation of 5-10 μm and more than 100 μm cracks in the crown material. The
 main reason of corrosion high quality silica bricks used to line the crown of
 electrovacuum glass furnace is the multiple cyclic change of crown
 temperature at 1405 - 1430°C range in the initial zone of crown and at 1575 -
 1605°C range in the zone of highest temperatures.

http://www.doiserbia.nb.rs/img/doi/0350-820X/2011/0350-820X1103295B.pdf

A. Balandis

Papers

Silica crown refractory corrosion in glass melting furnaces