Slag carry-over and the production of clean steel

For effective steel refining in the ladle (secondary steelmaking) the amount of steelmaking slag that is transferred from primary steelmaking must be limited, because the steelmaking slag contains iron oxide, manganese oxide, and phosphorus oxide. Adverse effects of slag carry-over include increased...

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Bibliographic Details
Published in:Journal of the South African Institute of Mining and Metallurgy 2019-06, Vol.119 (6), p.557
Main Author: Pistorius, P.C.
Format: Article
Language:English
Subjects:
Deoxidizers
Eccentric bottom tapping
Electric arc furnaces
Electric contacts
Furnaces
Infrared imaging
Iron and steel making
Iron oxides
Ladle metallurgy
Ladles
Manganese
Phosphorus
Phosphorus oxides
Refractory materials
Slag
Steel converters
Steel industry
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Summary:For effective steel refining in the ladle (secondary steelmaking) the amount of steelmaking slag that is transferred from primary steelmaking must be limited, because the steelmaking slag contains iron oxide, manganese oxide, and phosphorus oxide. Adverse effects of slag carry-over include increased consumption of deoxidizers, phosphorus pick-up by the steel, and increased ladle refractory wear. Infrared imaging at longer wavelengths is an effective non-contact method to detect slag in the tapping stream. Various devices are used to shut off the tapping stream rapidly. These include slag darts, pneumatic slag stoppers, and slide gates for steelmaking converters, and eccentric bottom tapping for electric arc furnaces.
ISSN:2225-6253
0038-223X
2411-9717
DOI:10.17159/2411-9717/kn01/2019