Method for the production of insulating material based on mineral fibres

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The invention relates to a method for producing insulating materials on the basis of mineral fibers, especially glass wool and/or rock wool. According to the inventive method, a silicate-type melt is produced in a melting unit, especially a cupola, and reduced to preferably microfine fibers in a defiberizer. Preferably binders and/or impregnants are added to the fibers and the fibers are placed on a conveyor in the form of a fibrous web. In order to improve the aforementioned method so that the use of inexpensive primary energy sources reduces the costs for carrying out the method, the method at the same time giving good melting results without impurities of the melt, the primary energy source used is a residue of approximately pure carbon produced during thermal cracking of crude petroleum, for example petroleum coke.