Title:
METHOD FOR DETOXIFYING SLAG OF STAINLESS STEEL
Document Type and Number:
Japanese Patent JP3675302
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a refining method for a stainless steel by which detoxification of produced slag is attained by restraining elution of hexavalent- chromium, fluorine and boron in the slag without increasing a slag-treatment process, and further, the slag can be utilized as the resource of a roadbed material, material for civil engineering, raw material for cement, etc. by preventing the stag from being powdered and the generation of the harmful slag can be reduced.
SOLUTION: In the reduction-refining period of the stainless steel, the slag composition is adjusted as follow: (%CaO)/(%SiO2)=0.5-1.5; (%Al2O3)=1-30%; (%Cr2O3)≤20%; (%B2O3)≤0.6%; (%F)≤5%; (%MgO)/(%CaO)=0.05-0.4; and (%T.Fe)+(%Cr2O3)+(%MnO)≤20%.
Inventors:
Yukitoshi Oyabu
Application Number:
JP2000160294A
Publication Date:
July 27, 2005
Filing Date:
May 30, 2000
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
C21C5/36; C21C5/54; C21C7/00; C21C7/06; C21C7/064; C21C7/076; (IPC1-7): C21C5/54; C21C5/36; C21C7/00; C21C7/06; C21C7/064; C21C7/076
Domestic Patent References:
| JP6171993A | ||||
| JP2000355711A | ||||
| JP11061219A | ||||
| JP2000319047A |
Attorney, Agent or Firm:
Shoichi Hirose