Producing alumina granules in a fluidized bed
US4797271A · kind A · utility
20Cited by
22References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1987 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Oct 22, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/82
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The process of the present invention for preparing granules of alumina includes pretreating an alumina powder by admixing with cold water in a mixer at a temperature below room temperature, e.g., such as below about 20.degree. C., to form a pretreated alumina having a pore volume saturated with water and further having a surface area of gel structure, and agglomerating the pretreated alumina in a fluidized bed to form granules. The process is particularly suited to producing activated alumina in macroporous granules. The process in one aspect further includes a cold hopper for cooling alumina powder prior to the pretreating step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.