Reduction of metallurgical wastes in an RF thermal plasma reactor

I. Mohai, J. Szépvölgyi, Z. Károly, M. Mohai, M. Tóth, I. Z. Babievskaya, V. A. Krenev

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12 Citations (Scopus)

Abstract

Recovery of metals from iron and zinc oxides, as well as from zinc-containing metallurgical wastes, such as flue dust from the Siemens-Martin process and sludge from hot galvanizing, has been studied in an rf thermal plasma reactor under reducing conditions. The product composition was estimated by thermodynamic calculations based on the minimization of the Gibbs free enthalpy. Effects of the plate power of rf generator and the feed rate of powder on the chemical and phase composition of products have been investigated in detail. It has been proved that the rf thermal plasma treatment makes possible to produce unstable species in thermodynamic terms: metallic zinc was gained in the reaction of ZnO and hydrogen. The gradient cooling along the plasma reactor led to the segregation of the iron and zinc compounds. Valuable products were made from the particular wastes by a single step thermal plasma processing.

Original languageEnglish
Pages (from-to)547-563
Number of pages17
JournalPlasma Chemistry and Plasma Processing
Volume21
Issue number4
DOIs
Publication statusPublished - Dec 1 2001

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Keywords

  • Metallurgical waste
  • Reduction
  • Thermal plasma
  • XPS
  • XRD

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

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