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Removal of zinc and alkalis
in steelmaking dusts by oxidative leaching
M.J.
Soria-Aguilar, F.R. Carrillo-Pedroza* and S. Preciado-Nuñez
Facultad de
Metalurgia – Universidad Autónoma de Coahuila, Carr. 57 km 5, Monclova,
Coahuila, C. P. 25710 México
Accepted 10 March 2005
ABSTRACT
Several processes in aqueous media have been developed to treat the dust
produced by the steel making industry, specifically dust originated from the
Iron Blast Furnace and the Basic Oxygen Furnace, BOF. The dust is not
completely recycled due to its high content of zinc, alkali and other
elements that affects the process efficiency; therefore this represents an
economical lost as a consequence of losing the iron and carbon contained in
it. The effort to treat such dust are either conventional like the
technology based on H2SO4 to the more advanced based
on alkaline lixiviation.
This work shows a comparison among several dust treatments in aqueous media
to reduce its zinc and alkali content, using diverse acid and alkaline
solutions and oxidants like the ozone. The results obtained show that the
elimination of zinc and alkalis can vary from 5% to 80% depending on the
treatment conditions (the solution, the oxidant and the temperature). The
results show that under very oxidant conditions like those reached by ozone
is possible to obtain a larger reduction of zinc and alkali content; this
represents an alternative for the treatment and recycle of the dust
originated in the steel making processes of Blast Furnace and BOF.
Keywords: Leaching, Steelmaking dust,
Ozone, Zinc, Alkalis
* Corresponding author
E-mail :
acm15322@infonte.uadec.mx |
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