Production process of Mineral Wool which comprises Melting spinning stage and stage of Molten Glass; Electric furnace for Melting, and mineral Wool.

摘要

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.