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Development of an injectable lime based reagent for the desulphurization of liquid iron

Conference Paper


Abstract


  • An injectable lime-based desulphurization reagent for the treatment of liquid iron was developed. Firstly, selected lime based slags containing small quantities of CaF2 to increase fluidity, and Na2O to increase the basicity, have been evaluated on laboratory scale from a thermodynamic point of view. Subsequently, pilot plant and full scale industrial injection trials were conducted. It was found that lime-based slags, containing Na2O and CaF2, are able to desulphurize liquid iron efficiently. By the injection of a lime based reagent consisting of 60% lime, 25% soda ash and 15% fluorspar at a rate of 7 kg reagent/ton hot metal, the sulphur level in the metal (115kg) was reduced from 0,07% to 0,01% within 5 minutes. The lime-based reagent developed in this study was successfully injected, both from a metallurgical and from a pneumatic point of view, on an industrial scale. The mathematical model utilised in this study, can be used successfully to predict the course and extent of desulphurization by lime-based slags.

Publication Date


  • 1996

Citation


  • Van Niekerk, W. H., & Dippenaar, R. J. (1996). Development of an injectable lime based reagent for the desulphurization of liquid iron. In The Howard Worner International Symposium on Injection in Pyrometallurgy (pp. 345-361).

Scopus Eid


  • 2-s2.0-38449107282

Web Of Science Accession Number


Start Page


  • 345

End Page


  • 361

Abstract


  • An injectable lime-based desulphurization reagent for the treatment of liquid iron was developed. Firstly, selected lime based slags containing small quantities of CaF2 to increase fluidity, and Na2O to increase the basicity, have been evaluated on laboratory scale from a thermodynamic point of view. Subsequently, pilot plant and full scale industrial injection trials were conducted. It was found that lime-based slags, containing Na2O and CaF2, are able to desulphurize liquid iron efficiently. By the injection of a lime based reagent consisting of 60% lime, 25% soda ash and 15% fluorspar at a rate of 7 kg reagent/ton hot metal, the sulphur level in the metal (115kg) was reduced from 0,07% to 0,01% within 5 minutes. The lime-based reagent developed in this study was successfully injected, both from a metallurgical and from a pneumatic point of view, on an industrial scale. The mathematical model utilised in this study, can be used successfully to predict the course and extent of desulphurization by lime-based slags.

Publication Date


  • 1996

Citation


  • Van Niekerk, W. H., & Dippenaar, R. J. (1996). Development of an injectable lime based reagent for the desulphurization of liquid iron. In The Howard Worner International Symposium on Injection in Pyrometallurgy (pp. 345-361).

Scopus Eid


  • 2-s2.0-38449107282

Web Of Science Accession Number


Start Page


  • 345

End Page


  • 361