The invention relates to a mold material mixture for producing casting molds for metal processing, a process for producing casting molds, casting molds which can be obtained by the process and their use. The production of the casting molds is carried out using a refractory base molding material and a binder based on water glass. A proportion of a particulate metal oxide selected from the group consisting of silicon dioxide, aluminium oxide, titanium oxide and zinc oxide is added to the binder, with particular preference being given to using synthetic amorphous silicon dioxide. The mold material mixture contains a surface-active material as further significant constituent. The addition of the surface-active material enables the flowability of the mold material mixture to be improved, which makes it possible to produce casting molds having a very complicated geometry.

A core discharge device is provided for discharging a sand core from a cast material in which the sand core contains a binder having water glass. The core discharge device includes a humidified gas supply device that supplies humidified gas to the sand core inside the cast molded article. The humidified gas is a gas to which humidity has been added and from which droplets have been removed.

The present invention provides a nanoparticle based sand conditioner composition a method of synthesizing the same. The composition comprises the raw material compound RM 1, RM 2, RM 3 and RM 4. The RM1 comprises of carbonaceous material, hydrocarbons, ultrafine metal/metal oxide and ceramic oxide nanoparticles and metallic wires. The RM 2 comprises natural carbon source. The RM 3 comprises synthetic/non-renewable carbon source. The RM 4 comprises hydrocarbons. The method of synthesizing nanoparticle based sand conditioner comprises mixing RM 2 and RM 4 in a mixer for 10 minutes for coating RM 2 with RM 4 to obtain an intermediate product. The RM 1 and RM 3 are added to intermediate product in a mixer and mixed for 10 minutes to get a uniform/homogeneous mixture which is cooled to obtain a sand conditioner composition impregnated with nanoparticles into carbon.

A core discharge device is provided for discharging a sand core from a cast material in which the sand core contains a binder having water glass. The core discharge device comprises a humidified gas supply device that supplies humidified gas, to which humidity has been added, to the sand core inside the cast molded article. The core discharge device

The present invention relates to a binder composition for making self-hardening foundry molds that is capable of improving the hardening speed of the molds and the strength of the molds, and is excellent in storage stability; and a method for producing a foundry mold, using this composition. The binder composition for making self-hardening foundry molds of the present invention is a binder composition for making self-hardening foundry molds, comprising a furan resin and an ion compound, wherein the ion compound contains at least one anion selected from the group consisting of a hydrogensulfite ion, a sulfite ion, a pyrosulfite ion, a thiosulfate ion, a thionate ion, and a dithionite ion; the content of the anion is from 0.006 to 0.60 parts by weight for 100 parts by weight of the furan resin; and the composition has a pH of 6 or less at 25 C.

The present invention relates to the use of closed-pore microspheres of expanded perlite as a filler for producing moldings for the foundry industry, to a composition for producing moldings for the foundry industry, comprising closed-pore microspheres of expanded perlite as a filler, and a binder, the binder being selected from the group consisting of water glass, phenol-formaldehyde resins, two-component systems comprising as reactants a polyisocyanate and a polyol component containing free hydroxyl groups (OH groups), and starch, and also to moldings for the foundry industry and to a process for producing a molding for the foundry industry.