METHOD FOR PRODUCING 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.

主权项

1. A process, comprising:
melting glass, thereby obtaining a molten glass, and then fiberizing the molten glass, thereby obtaining a mineral wool, wherein a chemical composition of the molten glass comprises, in a content by weight:SiO2from 39 to 55%Al2O3from 16 to 27%CaOfrom 3 to 35%MgOfrom 0 to 5%Na2O + K2Ofrom 9 to 17%Fe2O3from 0 to 15%B2O3from 0 to 8% wherein the melting comprises electric melting in a furnace comprising a tank comprising refractory blocks and two electrodes immersed in the molten glass, and wherein refractory blocks, in contact with the molten glass, comprise a material comprising at least 60% by weight of zirconium oxide and less than 5% by weight of chromium oxide.