Process for the environmentally tolerable disposal of mineral fibres and substances containing mineral fibres and their conversion into materials of value

摘要

Technical problem. The disposal of mineral fibres and substances containing mineral fibres, some of which are carcinogenic, in particular asbestos types, is still a great problem. Previous processes (dissolution in acids, fusion into glasses, burning in furnaces) are either highly energy-consuming or produce additional wastes. The end products obtained in all of these processes are in general waste materials which then must for the most part be stored in landfills. (As in, e.g.: DE 4035358 A1, DE 4027844 A1, DE3827157 A1, DE 3718000 A1; PCT/US89/00057 and 0372084, DE 4004201 A1; DE 3931686 A1, DE 4034026 A1). The aim of the invention is therefore a process which converts these mineral fibre materials into valuable materials. The process is moreover to be energy-effective and cost-effective. Solution of the problem. A process is described by which asbestos types and asbestos-containing materials (e.g. sprayed asbestos, asbestos-containing cements) and industrially produced mineral fibres (e.g. rock fibres, basalt fibres, slag fibres, ceramic fibres, glass fibres) and materials which have been produced from these, such as composite materials, felts, mats, insulating materials, can be converted by heating with additives in a tubular rotary furnace into valuable materials such as Portland cement and cement clinker. The process comprises the following part-steps: a) grinding and homogenising the materials to the particle size necessary for cement manufacture, either dry or with the addition... Original abstract incomplete.