Method for treating steel works dust by wet process
US6500229B1 · kind B1 · utility
6Cited by
3References
22Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 6, 2000 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Oct 6, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S75/961
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for treating steel works dust in order to recuperate elements capable of being upgraded. The method comprises attrition in water followed by hydraulic grading of the resulting load. The method is characterized in that is further comprises: a washing step to separate the water soluble saline fractions of the insoluble oxides; hot treatment to eliminate metals in the form of free oxides such as zinc and lead; treatment by heating at a temperature ranging between 240 and 800° C.; treatment with sulphuric acid having a concentration between 5 and 8%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.