Effect of high alkali content in ferrosilicomanganese smelting slags on slag properties and on the destruction of furnace lining

Michael Gasik, M.I. Gasik, S. P. Shuvaev

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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Abstract

Recovery of manganese from metallurgical wastes adds important value to the
environment and sustainable economy. Here industrial experience of re-use of tailings from gas-cleaning units of ferrosilicomanganese smelting is presented, and the results and challenges are discussed. One of the most important issues is the very high alkali content (up to 20–23% Na2O + K2O) in the tailings. Despite the positive effect of alkalis on slag viscosity, especially at low temperatures, they nevertheless play a destructive role in the furnace lining. This limits the share of these tailings in the charge composition.
We have experimentally processed viscosity data for different slag compositions and temperatures, especially for variable alumina and alkali concentrations. The pre-exponential factor of the Arrhenius equation was found to be highly dependent on the activation energy values. For the first time for these slag compositions, it is shown that their viscosity can be estimated based on temperature and composition, by applying the Meyer-Neldel rule. The activation energy is shown to correlate mainly with two parameters, namely alumina content and the mass ratio of alkalis to alumina. These practical correlations can be used to optimize slag properties for viscosity and its reactivity towards the lining.
Original languageEnglish
Title of host publicationInfacon XV : International Ferro-Alloys Congress
EditorsR. T. Jones, P. den Hoed, M. W. Erwee
Place of PublicationCape Town
PublisherSouthern African Institute of Mining and Metallurgy (SAIMM)
Pages307-313
Volume2
ISBN (Print)978-1-928410-02-7
Publication statusPublished - 31 Dec 2018
MoE publication typeA4 Conference publication
EventInternational Ferroalloys Congress - Cape Town, South Africa
Duration: 25 Feb 201828 Feb 2018
Conference number: 15

Conference

ConferenceInternational Ferroalloys Congress
Abbreviated titleInfacon
Country/TerritorySouth Africa
CityCape Town
Period25/02/201828/02/2018

Keywords

  • ferrosilicomanganese
  • slag
  • Viscosity
  • alkali
  • activation energy
  • lining

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