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

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussavertaisarvioitu

Tutkijat

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

Organisaatiot

  • National Metallurgical Academy of Ukraine
  • Ordzhonikidze mining and processing plant

Kuvaus

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.

Yksityiskohdat

AlkuperäiskieliEnglanti
OtsikkoInfacon XV : International Ferro-Alloys Congress
ToimittajatR. T. Jones, P. den Hoed, M. W. Erwee
TilaJulkaistu - 31 joulukuuta 2018
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaInternational Ferroalloys Congress - Cape Town, Etelä-Afrikka
Kesto: 25 helmikuuta 201828 helmikuuta 2018
Konferenssinumero: 15

Conference

ConferenceInternational Ferroalloys Congress
LyhennettäInfacon
MaaEtelä-Afrikka
KaupunkiCape Town
Ajanjakso25/02/201828/02/2018

ID: 32470486