Effect of KAlF4 on the efficiency of hot metal desulphurisation with magnesium

Frank Schrama, Elisabeth M. Beunder, Fuzhong Ji, Rhian Woolf, Chris Barnes, Jilt Sietsma, Rob Boom, Yongxiang Yang

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientific

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At the hot metal desulphurisation (HMD) stations of Tata Steel’s BOS plant in Port Talbot (UK), KAlF4 is injected together with magnesium in order to increase the fluidity of the slag and thus to decrease the iron loss. Although KAlF4 is successfully contributing to a lower iron loss during HMD, it also has a negative effect on the desulphurisation efficiency of magnesium. Analysis of slag samples from the plant and FactSage calculations showed that the fluorine in KAlF4 reacts with the magnesium, thus preventing the magnesium from reacting with the sulphur.
Original languageEnglish
Title of host publication8th European Oxygen Steelmaking Conference (EOSC 2018)
Number of pages9
Publication statusPublished - 2018
Event8th European Oxygen Steelmaking Conference - Taranto, Italy
Duration: 10 Oct 201812 Oct 2018


Conference8th European Oxygen Steelmaking Conference
Abbreviated titleEOSC 2018
Internet address


  • Hot Metal Desulphurisation
  • slag modifier
  • magnesium efficiency
  • fluorine
  • potassium cryolite


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