Importance

Loading Importance Indicators...

Abstract

A process for the manufacture of mineral wool can involve, first, a melting stage which makes it possible to obtain a molten glass. The chemical composition of the molten glass comprises the following constituents, in a content by weight, within the following limits: SiO₂, 39-55%; Al₂O₃, 16-27%; CaO, 3-35%; MgO, 0-5%; Na₂O+K₂O, 9-17%; Fe₂O₃, 0-15%; and B₂O₃, 0-8%. The melting stage is carried out by electric melting in a furnace that has a tank made of refractory blocks and at least two electrodes immersed in the molten glass. At least one of the refractory blocks, in contact with the molten glass, is made of a material having at least 60% by weight of zirconium oxide and less than 5% by weight of chromium oxide. The molten glass is fiberized to obtain the mineral wool.

Loading the Abstract Image...

First Claim