Method for producing casting molds, cores and basic mold materials regenerated therefrom

A process for producing casting molds, cores and mold base materials regenerated therefrom, comprising the following steps for production of a casting mold or a core:

• providing or producing a molding material mixture comprising
• a mold base material
• a solution or dispersion comprising waterglass
• 0.1% to 3% by weight of particulate amorphous silicon dioxide
• and, to facilitate the breakdown and/or to increase the regeneratability of the casting mold or the core,
• one or more particulate sheet silicates in a total amount of 0.05% to 0.4% by weight, where the d90 of the total amount of the sheet silicates is less than 45 μm,
• where the percentages are each based on the total mass of the molding material mixture,
• shaping the molding material mixture,
• curing the molding material mixture by chemical reaction of constituents of the molding material mixture with one another, so as to result in the casting mold or the core.