Apparatus for injecting gas into molten metal
US4973433A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 1989 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Jul 28, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01F2101/26
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Apparatus for injecting gas into molten metal includes a porous ceramic body having a first surface through which gas can be introduced into the body, and a second surface through which gas can flow from the body. A refractory member is attached to the body and surrounds at least the first surface, while leaving the second surface exposed. The refractory member is impervious to gas, while having a coefficient of thermal expansion approximating that of the body. Preferably, a refractory sealant securely attaches the refractory member to the body. By use of the present invention, the refractory member and the body remain tightly connected to each other at all times. Accordingly, gas leaks are prevented and all gas flowing into the body is discharged through the second surface, as desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.