Minelco Gmbh

Ralf-Joachim Gerlach

Bettina Wehren

A core or foundry sand that can be used for the production of cores and casting molds for the casting of molten metals includes a basic molding material, a layer of an adhesive agent coating the basic molding material, and a layer of water glass lying over the adhesive agent layer. The core or foundry sand has a water content in the range of &#x2266; approximately 0.25% by weight to approximately 0.9% by weight in relation to the overall weight of the core or foundry sand.

Core or foundry sand coated and/or mixed with water glass with a water content in the range of &#x2267; approximately 0.25% by weight to approximately 0.9% by weight

A molding material mixture for foundry purposes, comprising a mold sand, a sodium hydroxide solution, an alkali-silicate binding agent, and an additive suspension. The molding material mixture contains 0.1 to 10% by weight of sodium hydroxide solution with reference to the weight of the sand, 0.1 to 5% of binding agent with a solid matter percentage of 20 to 70%, and 0.1 to 3% by weight of the additive suspension. The additive suspension comprises 30 to 70% by volume of an amorphous, spherical SiOparticles, which have a first grain size in the range of 1 to 5 micrometers, and a second grain size in the range of 0.01 to 0.05 micrometers.

Molding material mixture, molded part for foundry purposes and process of producing a molded part

The molding material or molding part for foundry purposes, comprising 1-10% of binding agent based on alkali silicate, an aggregate containing 1-10 percent by weight of amorphous silicon dioxide, remainder quartz sand with a grain size range of 0.01 to 5 mm, and to a process of producing a molding material and molding parts. The abstract of the disclosure is submitted herewith as required by 37 C.F.R. &#xa7;1.72(b). As stated in 37 C.F.R. &#xa7;1.72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading 'Abstract of the Disclosure.' The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims. Therefore, any statements made relating to the abstract are not intended to limit the claims in any manner and should not be interpreted as limiting the claims in any manner.

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Krefeld, Germany

Ralf-Joachim Gerlach