Controlledly permeable/cristobalite-free diatomaceous filtering agents
US5710090A · kind A · utility
6Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1994 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Nov 18, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J20/14
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Unique pink/salmon diatomite agglomerates, well suited as filtering agents/aids, have a cristobalite content of less than 1.5%, a permeability ranging from 20 to 500 millidarcys, a cake density of less than 0.400 g/cm.sup.3, and are prepared by homogeneously intimately admixing a diatomite with a binder solution of silicic acid or of an alkali metal silicate, drying and optionally gently grinding the agglomerates thus formed, and then calcining the agglomerates at a temperature no greater than 850.degree. C., preferably no greater than 600.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.