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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
ESCI SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v1.i4.10
pages 421-432

CONTROL OF THE EVAPORATION IN A PLASMA FURNACE FOR FERROSILICON DUST TREATMENT

F. Petit
UPRES A 6015 CNRS - L.M.C.T.S. - Equipe "Plasma, Laser, Materiaux" 123, avenue Albert Thomas - 87060 Limoges Cedex - France
Alain Grimaud
L.E.T.P., Faculté des Sciences, 2 Bd Lavoisier 49045 Angers Cedex, France
C. Trassy
UPR 9033 CNRS - EPM, ENSHMG BP 95 - 38402 Saint-Martin-d'Heres - France
Pierre Fauchais
Laboratoire Sciences des Procedes Ceramiques et de Traitements de Surface UMR CNRS 6638 University of Limoges 123 avenue Albert Thomas, 87060 LIMOGES - France

ABSTRACT

The treatment of oxidized ferrosilicon dusts containing zinc and lead was studied in a plasma transferred arc reactor. Particles to be treated were injected either in the plasma arc (in-flight treatment) or directly into the crucible (bath treatment). An ICP (Inductively Coupled Plasma) analysis system was adapted to follow on-line simultaneously and continuously the metallic element concentrations. Evaporated fraction were then determined. Comparisons of fractions according to arc working parameters were performed; this allowed the control of the evaporation process dring plasma operations. The in-flight treatment has led to a selective evaporation but has shown the need of a second step, since the dust treatment is incomplete when its method is used. The in-bath treatment has led to a selective and complete evaporation of lead and zinc. The value of additives such as a reductant and a slag former was also highlighted by ICP analysis.


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