Acid activated clay for use in foundry sand
US6860319B2 · kind B2 · utility
0Cited by
1References
35Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 4, 2003 |
| Grant date | Mar 1, 2005 |
| Priority date | — |
| Expiry date | Aug 13, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C1/181
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A foundry sand binder formed by reacting a smectite clay containing exchangeable calcium ions with an acid to enhance the ability of the clay to bind sand in forming a metal casting sand mold. The acid-treated clay is an excellent sand binder for metal casting molds and produces cast metal parts having improved surface finish with the elimination or substantial reduction in carbonaceous, e.g., coal, foundry sand additive, while reducing VOC emissions from the foundry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.