Method of reusing core sand

Patent metadata

Field	Value
Publication number	US-10668525-B2
Application number	US-201815949394-A
Country	US
Kind code	B2
Filing date	Apr 10, 2018
Priority date	Oct 19, 2015
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

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.

First claim

What is claimed is:

1. A method of reusing core sand comprising:
crushing a core used for casting into granules, the core including water glass as a binder;
heating the granules at a temperature of 300° C. to 550° C.;
after heating the granules, detaching the water glass from the core sand; and
separating and collecting the core sand from a mixture of the water glass and the core sand, the water glass detached from the core sand being.

2. The method of reusing core sand according to claim 1 , wherein
when the water glass is detached from the core sand, the water glass includes water-soluble water glass and water-insoluble water glass.

3. The method of reusing core sand according to claim 1 , further comprising:
after heating the granules, cooling the granules to a temperature suitable for detaching the water glass from the core sand.

Assignees

• Toyota Motor Co Ltd

Inventors

• Yamashita Daisuke
• Watanabe Hirotsune
• Morikawa Masashi

Classifications

• B22C5/04 Primary

  by grinding, blending, mixing, kneading, or stirring · CPC title

• B22C5/10

  by dust separating · CPC title

• B22C1/188

  Alkali metal silicates · CPC title

• B22C5/045

  Devices having a horizontal stirrer shaft in a fixed receptacle (B22C5/0422 takes precedence) · CPC title