Industrial investigation of decarburization and desulphurization behaviour of 120 t new single snorkel degasser

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Abstract
New single snorkel degasser (NSSD) has been developed for vacuum refining of high-efficiency decarburization and desulphurization. Lifting gas modes of the NSSD have three modes: ladle bottom blowing, immersion tube's side blowing and side-bottom combined blowing. The side blowing is composed of equidistant argon-blowing pipes arranged on immersion tube, which can freely control ladle top slag behaviour. Then, effect of different lifting gas modes and process parameters on decarburization and desulphurization behaviour is investigated by industrial experiments. Results show that: ① compared with other lifting gas modes, side-bottom combined blowing mode under asymmetrical blowing with larger flow rate difference on immersion tube can not only achieve higher decarburization rate, but also does not need discharge slag before vacuum treatment. ② The NSSD can not only obtain high desulphurization degree of above 80% by slag-steel reaction and side-bottom combined blowing mode under symmetrical blowing on immersion tube, but also avoid unfavorable fluorite desulphurizer.