Abstract: A moulding material mixture with at least one refractory material and water glass as an inorganic binding agent is used for producing casting moulds. The binding agent is cured with the aid of a carbonyl compound that has a molecular weight greater than 88 g/mol and less than 200 g/mol and a boiling point at 1013 hPa greater than 20° C. and less than 200° C. The at least one carbonyl compound is introduced into the gas phase, or carried with the gas phase. The at least one carbonyl compound has the formula R1R2C?O, where R1 is H or a C1 or C2 alkyl and R2 is a carboxyl group R—C(?O)—O— bonded via the oxygen atom, where R is a C1 to C3 hydrocarbon.

Abstract: The invention relates to lithium-containing molding material mixtures comprising a refractory main molding material, an inorganic binder, and amorphous silicon dioxide as an additive in the production of molds and cores for metal casting. The invention further relates to a method for producing molds and cores using the molding material mixtures and to molds and cores produced according to the method.

Abstract: The invention relates to a method for producing casting moulds and cores, according to which a moulding material mixture consisting of at least one refractory material and water glass as an inorganic binding agent is cured with the aid of a carbonyl compound introduced into the gas phase, or carried with the gas phase. The invention also relates to a corresponding moulding material mixture, to a multi-component system and to moulds and cores produced according to the method.

Abstract: The invention relates to lithium-containing molding material mixtures comprising a refractory main molding material, an inorganic binder, and amorphous silicon dioxide as an additive in the production of molds and cores for metal casting. The invention further relates to a method for producing molds and cores using the molding material mixtures and to molds and cores produced according to the method.