Invention Grant
US07641713B2 Method for reducing Cr in metallurgical slags containing Cr 有权
含有Cr的冶金炉渣中Cr的还原方法

  • 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
  • Application No.: US11579102
    Application Date: 2005-05-18
  • Publication No.: US07641713B2
    Publication 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
Method for reducing Cr in metallurgical slags containing Cr
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.
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