Title: Method of desulfurization of a steel melt

Abstract: A steel melt is confined and subjected to a partial vacuum. A particulate additive is entrained by a neutral nonreactive carrier gas and introduced into the melt below the surface thereof at a depth such that the additive is immediately vaporized and rises toward the surface of the melt in the form of bubbles which react with components of the melt. With particulate calcium as the additive an injection depth 1500 mm, a temperature of approximately 1500.degree.C, and a vacuum of 20 Torr allows the sulfur content of a steel melt readily to be reduced below 0.005% by weight.

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Inventors: Forster, Eckehard (Oberhausen, DT)
Richter, Helmut (Oberhausen, DT)
Spetzler, Edgar (Oberhausen, DT)
Wendorff, Jochen (Oberhausen, DT)
Klapdar, Wilhelm (Essen, DT)
Rommerswinkel, Heinrich-Wilhelm (Mulheim (Ruhr), DT)

Application Number: 461714
Filing Date: 1974-04-17
Publication_date: 1976-09-14
Assignee: Thyssen Niederrhein AG Hutten- und Walzwerke (Oberhausen, DT)
Primary Class(es): 75/512 420/129
Other Classes:
US Patent Ref:

3001864	Sep, 1961	Muller	75/130.
3060015	Oct, 1962	Spolders	75/49.
3367646	Feb, 1968	Robertson	75/129.
3467167	Sep, 1969	Mahin	75/49.
3512957	May, 1970	Brotzmann	75/49.
3545960	Dec, 1970	McClellan	75/51.
3547622	Dec, 1970	Hutchinson	75/49.
3575695	Apr, 1971	Miyashita	75/51.
3598383	Aug, 1971	Moore	75/130.

Other Refs:
Primary Examiner: Rosenberg, P. D.
Assistant Examiner:
Attorney: Ross; Karl F., Dubno; Herbert