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1. (WO1998017832) METHOD OF DE-CHROMING AND/OR DEPLETING THE MgO CONTENT OF STEEL SLAG

Pub. No.:    WO/1998/017832    International Application No.:    PCT/AT1997/000224
Publication Date: Apr 30, 1998 International Filing Date: Oct 20, 1997
IPC: C04B 5/06
C21B 3/06
C21C 5/00
C21C 5/36
C22B 7/04
C22B 34/32
Applicants: 'HOLDERBANK' FINANCIERE GLARUS AG
EDLINGER, Alfred
Inventors: EDLINGER, Alfred
Title: METHOD OF DE-CHROMING AND/OR DEPLETING THE MgO CONTENT OF STEEL SLAG
Abstract:
The invention concerns a method of de-chroming steel slag, oxygen being introduced into the liquid steel slag in an amount sufficient to convert iron quantitatively into iron oxide and at least 5 wt % of the iron oxide present in the slag into iron-III oxide. The resultant oxidized slag is hardened and comminuted, the paramagnetic portions formed then being separated magnetically and dissociated from the de-chromed slag.