Process for producing refractory or fire-resistant light-weight mouldings

摘要

The invention relates to a process for producing refractory or fire-resistant light-weight mouldings with the use of a mixture of refractory or fire-resistant materials having a maximum grain size of 0.5 mm, especially 0.1 mm, plaster and, if appropriate, organic and/or inorganic fibres by preparing a mixture of these constituents with water and addition of a separately prepared foam, production of the mouldings by conventional moulding procedures, mould release, drying and firing of the light-weight mouldings, and to refractory or fire-resistant light-weight mouldings produced by the process. The process according to the invention is characterised in that a foam is used, in the production of which the foaming agent used is a) a mixture of an ammonium alkyl ether-sulphate with an aromatic sodium sulphonate or b) a sodium alkyl polyglycol ether-sulphate or c) a mixture of a sodium alkyl polyglycol ether-sulphate, an aromatic sodium sulphonate and a fatty acid diethanolamide. The light-weight mouldings produced by the process according to the invention are distinguished by a particularly fine porosity and good mechanical properties.