Method for preparing inorganic pigments, resulting inorganic pigments, and apparatus therefor
US6022406A · kind A · utility
7Cited by
7References
25Claims
0Family size
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Inventors
Key dates
| Filing date | May 27, 1998 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | May 27, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for preparing inorganic pigments from steel mill dust, particularly electric steel mill dust, wherein (a) the dust is separated into a magnetic fraction and a non-magnetic fraction; (b) the non-magnetic fraction is subjected to a basic leaching reaction; (c) the resulting solid batch is rinsed until neutralized and then separated; (d) the resulting batch is calcined at 450-650.degree. C.; (e) the calcined batch is treated with sulfuric acid in the presence of a catalyst; (f) the inorganic pigments are recovered; and (g) the solutions from (c) and (e) are used to precipitate other pigments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.