Method for producing powdered iron oxide
US5032367A · kind A · utility
4Cited by
5References
4Claims
0Family size
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Key dates
| Filing date | Dec 16, 1988 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Dec 16, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S423/01
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for producing a powdered iron oxide comprises the steps of adjusting the pH of a crude iron chloride solution to 2.5-4.5; reducing the P content of the solution by mechanical stirring or air bubbling and filtering; and oxidizing the solution into a powdered iron oxide having a maximum P content of 0.005 wt. %. The P content of the solution may also be reduced by ultrafilter treatment. The soft ferrite made by using the powdered iron oxide by this process shows excellent magnetic properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.