Process for the production of highly permeable calcined diatomites with low cristobalite content and resultant calcined diatomaceous filtration agents
US5179062A · kind A · utility
17Cited by
8References
10Claims
0Family size
Inventor
Key dates
| Filing date | Jun 7, 1991 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | Jun 7, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J20/14
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for the production of calcined diatomaceous filtration agents having a cristobalite content lower than 1% and a 50-.mu.m screen retention rate lower than 5% by rapid calcination of diatomites, comprising injecting the diatomite into a high-temperature gaseous stream and during its residence in the gaseous stream maintaining the diatomite between about 1250.degree. and 850.degree. C. for a period of time between several tens of milliseconds and several seconds, and calcined diatomaceous filtration agents having a permeability between 0.06 and 0.4 darcy and a cristobalite content lower than 1%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.