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Slag Basicity: What Does It Mean?

  • G. A. BrooksEmail author
  • M. M. Hasan
  • M. A. Rhamdhani
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The concept of “basicity” has been central to our understanding of slag chemistry for many decades. Traditionally, basicity has been connected to the level of networking present in a slag, acid slags having a great deal of networking and basic slag having less networking. Qualitatively, this approach provides quite reasonable explanations to the viscosity of slags, their general interaction with refractories and their ability to dissolve oxidised elements from the metal/matte phase. Various quantitative measures of basicity have been proposed, such as optical basicity and the NBO/T ratio, and there have some successful attempts to link these measurements to important properties. However, in general, these measures have not been successfully linked to common thermodynamic relationships (other than empirically) or direct measurements from the plant. In industry, weight ratio’s and empirical relationships dominate the control logic of the metallurgical processes. In this paper, we will review what is the current state of knowledge of “basicity”, recent research into connecting NBO/T ratios to quantitative measurements and thermodynamic quantities and propose a way forward towards a more rigorous and useful understanding of “basicity”.

Keywords

Basicity Slag chemistry Slag structure Slag properties 

Notes

Acknowledgements

This paper is dedicated to the memory of the late Dr Andrew Ducret who patiently explained the fundamentals of slag chemistry to the first author of this paper between doing experiments, playing cards in the student common room and enjoying each other’s company at the University of Melbourne in 1990. We are also grateful to conversations with Mr Lesley Beyers from KU Leuven on these topics.

References

  1. 1.
    Thomas and Gilchrist (1929) Blockow and Vaughan 1879-1928. Vaughan & Co., Ltd., Middlesbrough, BlockowGoogle Scholar
  2. 2.
    Bodsworth C, Bell HB (1972) Physical chemistry of iron and steel manufacture. Longman, London, pp 66–89Google Scholar
  3. 3.
    Gilchrist JD (1989) Extraction metallurgy, 3rd edn. Pergamon Press, London, pp 198–200Google Scholar
  4. 4.
    Oeters F (1989) Metallurgy of steelmaking. Berlin, Stahl & Eisen, p 3–14Google Scholar
  5. 5.
    Rosenqvist T (2004) Principles of extractive metallurgy. Tapir Academic Press, Trondheim, pp 295–320Google Scholar
  6. 6.
    Turkdogan E (1996) Fundamentals of steelmaking. Institute of Materials, London, pp 138–179Google Scholar
  7. 7.
    Laird BB, Chang R (2009) University Chemistry. McGraw-Hill, Boston, pp 556–610Google Scholar
  8. 8.
    Sherwood Taylor F (1976) The alchemists. Palladin, LondonGoogle Scholar
  9. 9.
    Kurushkin M, Kurushkin D (2018) Acid-base behavior of 100 element oxides: visual and mathematical representations. J of Chem Edu 95(4):678–681CrossRefGoogle Scholar
  10. 10.
    Flood H, Förland T (1947) The acidic and basic properties of oxides. Acta Chem Scand 1:592–604CrossRefGoogle Scholar
  11. 11.
    Lux H (1939) Acids and bases in a fused salt bath: the determination of oxygen-ion concentration. Z Elektrochem Soc 45:303–310Google Scholar
  12. 12.
    Flood H, Grojtherm K (1952) J Iron Steel Inst 171:64Google Scholar
  13. 13.
    Sommerville I, Sosinsky D (1994) Solubility, capacity and stability of species in metallurgical slags and glasses. Pyrometallurgy Complex Mater Wastes: p 73–91Google Scholar
  14. 14.
    Richardson F (1948) Slags and refining processes. The constitution and thermodynamics of liquid slags. Discussions of the Faraday Society 4:244–257CrossRefGoogle Scholar
  15. 15.
    Duffy J, Ingram M (1976) An interpretation of glass chemistry in terms of the optical basicity concept. J Non-Cryst Solids 21(3):373–410CrossRefGoogle Scholar
  16. 16.
    Sommerville I, Sosinsky D. The application of the optical basicity concept to metallurgical slags. In: Proceedings in 2nd international symposium on metallurgical slags and fluxes. metallurgical society of the AIME, pp 1015–1026Google Scholar
  17. 17.
    Nakamura T, Ueda Y, Toguri J (1986) A new development of the optical basicity. J Jpn Inst Met 50(5):456–461CrossRefGoogle Scholar
  18. 18.
    Sommerville I, Masson C (1992) Group optical basicities of polymerized anions in slags. Metall Trans B 23(2):227–229CrossRefGoogle Scholar
  19. 19.
    Wagner C (1975) The concept of the basicity of slags. Metall Trans B 6(3):405CrossRefGoogle Scholar
  20. 20.
    Virgo D, Mysen B, Kushiro I (1980) Anionic constitution of 1-atmosphere silicate melts: implications for the structure of igneous melts. Science 208(4450):1371–1373CrossRefGoogle Scholar
  21. 21.
    De Jong B, Schramm CM, Parziale VE (1984) Silicon-29 magic angle spinning NMR study on local silicon environments in amorphous and crystalline lithium silicates. J Am Chem Soc 106(16):4396–4402CrossRefGoogle Scholar
  22. 22.
    Farges F, Brown Jr GE (1997) Coordination chemistry of titanium (IV) in silicate glasses and melts: IV. XANES studies of synthetic and natural volcanic glasses and tektites at ambient temperature and pressure. Geochimica et Cosmochimica Acta, 61(9):1863–1870CrossRefGoogle Scholar
  23. 23.
    Farges F, Brown Jr GE, Rehr J.J (1996) Coordination chemistry of Ti (IV) in silicate glasses and melts: I. XAFS study of titanium coordination in oxide model compounds. Geochimica et Cosmochimica acta, 60(16):3023–3038CrossRefGoogle Scholar
  24. 24.
    Sohn I et al (2012) Influence of TiO2 on the viscous behavior of calcium silicate melts containing 17 mass% Al2O3 and 10 mass% MgO. ISIJ Int 52(1):158–160CrossRefGoogle Scholar
  25. 25.
    Chaskar V, Richards G, McCammon C (1993) A mössbauer study of the behavior of iron cations in iron oxide-containing melts at 1400 °C. Metall Trans B 24(1):101–111CrossRefGoogle Scholar
  26. 26.
    Mysen BO, Virgo D, Seifert FA (1982) The structure of silicate melts: implications for chemical and physical properties of natural magma. Rev Geophys 20(3):353–383CrossRefGoogle Scholar
  27. 27.
    Halter WE, Mysen BO (2004) Melt speciation in the system Na2O–SiO2. Chem Geol 213(1–3):115–123CrossRefGoogle Scholar
  28. 28.
    Min DJ, Tsukihashi F (2017) Recent advances in understanding physical properties of metallurgical slags. Met Mater Int 23(1):1–19CrossRefGoogle Scholar
  29. 29.
    Park JH, Min DJ, Song HS (2004) Amphoteric behavior of alumina in viscous flow and structure of CaO-SiO 2 (-MgO)-Al 2 O 3 slags. Metall Mater Trans B 35(2):269–275CrossRefGoogle Scholar
  30. 30.
    Park Y, Min DJ (2017) A Structural Study on the Foaming Behavior of CaO-SiO 2-MO (MO = MgO, FeO, or Al 2 O 3) Ternary Slag System. Metall Mater Trans B 48(6):3038–3046CrossRefGoogle Scholar
  31. 31.
    Maroufi S et al (2016) Diffusion coefficients and structural parameters of molten slags. In: Advances in molten slags, fluxes, and salts: proceedings of the 10th international conference on molten slags, fluxes and salts 2016, SpringerGoogle Scholar
  32. 32.
    Mills KC (1993) The influence of structure on the physico-chemical properties of slags. ISIJ Int 33(1):148–155CrossRefGoogle Scholar
  33. 33.
    Shuva MAH, Rhamdhani MA, Brooks GA, Masood S, Reuter MA (2016) thermodynamics behavior of germanium during equilibrium reactions between FeOx-CaO-SiO2-MgO slag and molten copper. Metall Mater Trans B 47(5):2889–2903CrossRefGoogle Scholar
  34. 34.
    Shuva MAH, Rhamdhani MA, Brooks GA, Masood S, Reuter MA (2017) Thermodynamics of palladium (Pd) and tantalum (Ta) relevant to secondary copper smelting. Metall Mater Trans B 48(1):317–327CrossRefGoogle Scholar
  35. 35.
    Shuva MAH (2017) Analysis of thermodynamics behaviour of valuable elements and slag structure during e-waste processing through copper smelting. Ph.D. thesis, Swinburne University of TechnologyGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Swinburne University of TechnologyMelbourneAustralia

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