Compositions and methods for improving casting quality and mold sand additives
US10906088B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2016 |
| Grant date | Feb 2, 2021 |
| Priority date | — |
| Expiry date | Apr 4, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C9/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of forming a dry molding sand additive may include recovering a non-sand fraction from a foundry waste material and adding the non-sand fraction to a dry molding sand additive formulation to form a dry molding sand additive. Adding the non-sand fraction to the dry molding sand additive formulation may reduce the amount of fresh clay and carbon to produce the dry molding sand additive. A method of forming a molding sand additive may include recovering a waste molding sand additive composition having a clay or carbon content differing from a desired clay and carbon content, recycling the waste molding sand additive as a raw material in production of a fresh molding sand additive, and adjusting the amount of fresh clay or carbon added during production of the fresh molding sand additive to achieve the desired clay and carbon content.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.