The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 2003
Filed:
Nov. 28, 2000
Hermann Pirker, Steyregg, AT;
Abstract
In a steelmaking process in which, in order to desulfurize iron melts ( ) using a strongly basic slag in a desulfurization vessel ( ), the desulfurization slag ( ) is brought to a temperature of from 1400-1800° C. by heating, and this desulfurization slag ( ) is used to desulfurize the sulfur-containing iron melt, which is then poured off without any slag either discontinuously or continuously beneath the desulfurization slag ( ), the ratio of iron melt ( ) to desulfurization slag ( ) not exceeding the value of 10:1 parts by weight, and the desulfurization slag ( ) being regenerated continuously and/or discontinuously, and then a steel melt ( ) being produced from the iron melt ( ), to simplify a subsequent ladle treatment of the crude steel ( ) produced from the desulfurized pig iron ( ), in particular to minimize energy consumption and to avoid material which has to be landfilled, a partial amount of the desulfurization slag ( ) from the desulfurization vessel ( ) is introduced into a steel-casting ladle ( ) for the desulfurized iron melt ( ) which has been converted to form a crude steel melt ( ), and this partial amount is recirculated after the ladle treatment and after the steel melt ( ) formed in this way has been poured off (FIG.).