Mixture molding materials containing phosphorus for producing casting molds for metal processing

Molding material mixture for producing casting molds for metalworking, comprising at least: - one base refractory material molding; - a binder based on water glass; - a portion of a particulate metal oxide that is selected from the group consisting of silicon, aluminum oxide, titanium oxide and zinc oxide; characterized in that the molding material mixture is added a portion of a phosphorus-containing compound.