A method of reusing core sand includes crushing a core used for casting into granules; heating the granules at a temperature of 300 C. to 550 C.; causing the heated granules to collide against each other such that water glass used as a binder detaches from the core sand; and blowing air into a mixture of the water glass and the core sand, which are detached from each other, such that the core sand is separated and collected from the mixture due to a difference in specific gravity between the water glass and the core sand.

A casting article according to an exemplary aspect of the present disclosure includes, among other things, a circuit forming portion and an interior channel formed inside of the circuit forming portion. The interior channel defines a leaching path that extends at least partially through the circuit forming portion.

The present invention relates to investment casting moulds comprising a furnace dust, wherein said furnace dust comprises ZrO.sub.2 and/or Al.sub.2O.sub.3. The present invention also relates to investment casting moulds comprising a metal oxide dust comprising ZrO.sub.2 and one or more materials selected from alumina, silica and aluminosilicate, and wherein said metal oxide dust has a d.sub.50 of 10 m or less. The invention also relates to compositions for the production of investment casting moulds, the use of dusts in the formation of investment casting moulds, and the use of investment casting moulds of the invention.

The present invention relates to investment casting moulds comprising a furnace dust, wherein said furnace dust comprises ZrO.sub.2 and/or Al.sub.2O.sub.3. The present invention also relates to investment casting moulds comprising a metal oxide dust comprising ZrO.sub.2 and one or more materials selected from alumina, silica and aluminosilicate, and wherein said metal oxide dust has a d.sub.50 of 10 m or less. The invention also relates to compositions for the production of investment casting moulds, the use of dusts in the formation of investment casting moulds, and the use of investment casting moulds of the invention.

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.

What are described are the use of a refractory coating composition for production of cores for diecasting, a kit for production of cores for use in diecasting, a method of producing cores for use in diecasting, cores for use in diecasting, and the use of such cores in diecasting, especially of lightweight metals.

Provided herein is a system, apparatus, and method for producing refractory products, and more particularly, to producing heated refractories, passive refractories, transition plates, moldable refractories, and accessories such as heated spouts, heated pins, thimbles, and dams. A heated refractory channel as disclosed herein may include a working surface to contain molten metal within the channel; a core adjacent to the working surface; one or more heating elements disposed within the core; and insulation, where the core is disposed between the working surface and the insulation. The one or more heating elements may be molded into the core. The heating elements may be electrical resistance heating elements.

Compositions useful for foundry processes such as green sand casting are discussed. The compositions may comprise an aggregate, at least one inorganic binding agent, and at least one high aspect ratio silicate. For example, the composition may comprise sand, one or more clay materials serving as a binding agent, and a high aspect ratio silicate chosen from mica, talc, or a combination thereof. The composition may be formed into a green sand mold for use in casting molded articles. Incorporation of the high aspect ratio silicate may help to improve the quality of the casted article.

Compositions useful for foundry processes such as green sand casting are discussed. The compositions may comprise an aggregate, at least one inorganic binding agent, and at least one high aspect ratio silicate. For example, the composition may comprise sand, one or more clay materials serving as a binding agent, and a high aspect ratio silicate chosen from mica, talc, or a combination thereof. The composition may be formed into a green sand mold for use in casting molded articles. Incorporation of the high aspect ratio silicate may help to improve the quality of the casted article.

The present invention relates to methods for the layered construction of molds and cores that include refractory molding base material, a hydrophobized metal oxide as solids and a binder containing at least water glass in the form of an aqueous alkali silicate solution. The methods involve applying a refractory molding base material in layers and selectively print the molds and cores using the binder. The present invention further relates to molds or cores produced in accordance with these methods.