Invention Grant
- Patent Title: Method for reducing Cr in metallurgical slags containing Cr
- Patent Title (中): 含有Cr的冶金炉渣中Cr的还原方法
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Application No.: US11579102Application Date: 2005-05-18
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Publication No.: US07641713B2Publication Date: 2010-01-05
- Inventor: Markus Tschudin
- Applicant: Markus Tschudin
- Applicant Address: CH Jona
- Assignee: Holcim Technology Ltd.
- Current Assignee: Holcim Technology Ltd.
- Current Assignee Address: CH Jona
- Agency: Chapman and Cutler LLP
- Priority: ATGM367/2004 20040518
- International Application: PCT/IB2005/001342 WO 20050518
- International Announcement: WO2005/113840 WO 20051201
- Main IPC: C22B7/04
- IPC: C22B7/04 ; C21C5/28

Abstract:
A method for reducing the chromium content from a metallurgical slag, in which the slag is charged onto an iron bath in the liquid state and the reduction of Cr is effected by the iron bath having a C content of 2 to 4% by weight, wherein a) the Cr-containing slag having a Cr content of 2 to 20% by weight is charged onto an iron bath having a C content of below 1% by weight, whereupon b) the carbon content of the iron bath is raised to about 2 to 4% by weight by the addition of carbon carriers at the simultaneous supply of energy, c) the liquid slag having a Cr content of about 0.1% by weight is tapped after the reduction of Cr, d) a cooling agent, preferably scrap, is added to the iron melt and the C content of the melt is lowered to below 1% by weight, and e) a portion of the Cr-containing melt is tapped in the liquid state, while the remaining portion is left in the converter in the liquid state for the treatment of the subsequent melt.
Public/Granted literature
- US20070227307A1 Method for Reducing Cr in Metallurgical Slags Containing Cr Public/Granted day:2007-10-04
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