Inorganic coated sand

Patent metadata

Field	Value
Publication number	US-11958103-B2
Application number	US-201917258514-A
Country	US
Kind code	B2
Filing date	Jun 24, 2019
Priority date	Jul 9, 2018
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

Inorganic coated sand in a dry state having refractory aggregate; and an inorganic binder layer formed on a surface of the refractory aggregate, in which the inorganic binder layer contains a metasilicate hydrate.

First claim

The invention claimed is:

1. A method for manufacturing inorganic coated sand in a dry state, the inorganic coated sand having refractory aggregate and an inorganic binder layer formed on a surface of the refractory aggregate,
wherein the inorganic binder layer comprises a metasilicate hydrate, and
wherein amount of the inorganic binder layer to be applied is 0.05 parts by mass or greater and 10 parts by mass or less with respect to 100 parts by mass of the refractory aggregate,
the method comprising:
a step (1) of obtaining a mixture by mixing the refractory aggregate with the metasilicate hydrate at a temperature equal to or higher than a melting point of the metasilicate hydrate; and
a step (2) of cooling the mixture to a temperature lower than the melting point of the metasilicate hydrate; and
wherein in the step (1) the metasilicate hydrate is previously melted before being added to and mixed with the refractory aggregate.

2. A method for manufacturing inorganic coated sand in a dry state, the inorganic coated sand having refractory aggregate and an inorganic binder layer formed on a surface of the refractory aggregate,
wherein the inorganic binder layer comprises a metasilicate hydrate, and
wherein amount of the inorganic binder layer to be applied is 0.05 parts by mass or greater and 10 parts by mass or less with respect to 100 parts by mass of the refractory aggregate,
the method comprising:
a step (1) of obtaining a mixture by mixing the refractory aggregate with the metasilicate hydrate at a temperature equal to or higher than a melting point of the metasilicate hydrate; and
a step (2) of cooling the mixture to a temperature lower than the melting point of the metasilicate hydrate; and
wherein in the step (1), the metasilicate hydrate is mixed without being previously made into an aqueous solution.

Assignees

• Kao Corp

Inventors

• Ina Yoshimitsu
• Kato Masayuki

Classifications

• B22C1/188 Primary

  Alkali metal silicates · CPC title

• B22C1/10

  for influencing the hardening tendency of the mould material (influencing the hardening tendency of the binding agent only B22C1/16) · CPC title

• B22C1/18 Primary

  of inorganic agents {(B22C1/162 takes precedence)} · CPC title

• B22C1/00

  Compositions of refractory mould or core materials; Grain structures thereof (refractory materials in general C04B35/00); Chemical or physical features in the formation or manufacture of moulds · CPC title