Idioma:

STUDY OF THE REDUCTION PROCESS OF IRON IN LEACHATE FROM NICKEL MINING WASTE

A. B. Botelho Junior ; M. M. Jiménez Correa ; D. C. R. Espinosa ; J. A. S. Tenório

Texto completo disponível

Citações Citado por

Título:
STUDY OF THE REDUCTION PROCESS OF IRON IN LEACHATE FROM NICKEL MINING WASTE
Autor: A. B. Botelho Junior ; M. M. Jiménez Correa ; D. C. R. Espinosa ; J. A. S. Tenório
Assuntos: Chemical Engineering not elsewhere classified ; FOS: Chemical engineering
Notas: 10.1590/0104-6632.20180354s20170323
RelationTypeNote: IsSupplementTo -- 10.1590/0104-6632.20180354s20170323
Descrição: ABSTRACT A mechanism to convert Fe(III) to Fe(II) by a reduction process could be a solution to the problem of selective separation of metals in extraction processes by using the ion-exchange process. The aim of this research was to reduce Fe(III) to Fe(II) present in leachate from nickel mining waste. Reducing agents used were sodium dithionite and sodium metabisulfite. The potential was decreased in order to quantify the minimum reducing agent that was necessary for conversion. Reaction time, pH, stirring speed and temperature were also studied. Results indicated dithionite was a better reducing agent than metabisulfite and complete conversion was possible by reducing the potential to 590mV at pH 0.5-2 and 240mV at pH 2.5. Stirring speed had no influence on the reduction process at 2 hours; however, conversion decreased after 24 hours, perhaps due to oxygen present in air. The analyses were conducted by ion chromatography and voltammetry.
Editor: SciELO journals
Data de criação/publicação: 2019
Idioma: Inglês

Links

Voltar para lista de resultados