METHOD AND DEVICE FOR THE PRODUCTION OF MINERAL WOOL BY USING MINERAL WOOL WASTE AS A RECYCLED STARTING MATERIAL

摘要

The melting tub (1) for producing the molten mass (2) from a mixture (21) of raw materials is associated with an additional melting unit (4) by means of which a recycled molten mass (29) is obtained from mineral wool waste (28) largely corresponding to the molten mass (2) obtained from the mixture (21) of raw materials in quality and composition. The recycled molten mass (29) is supplied to the molten mass (2) in the melting tub (1) through a suitable introduction device (43). The recycling exhaust gas (30) from the additional melting unit (4) is fed to the tub exhaust gas (24), and the mixture of exhaust gas is utilised for pre-heating combustion air and mixture of raw materials (21). Due to dividing "preparation of molten mass" into conventional production of molten mass from the mixture (21) of raw materials in the melting tub (1) and concurrent production of molten mass from mineral wool waste (28) in an additional melting unit (4), molten products and exhaust gas of which are directly supplied to the melting tub (1), it is possible to utilise mineral wool waste (28) as a recycled starting material in a cost-effective manner without affecting the complicated control of process parameters in conventional production of molten mass.