| Full text | |
| Author(s): |
Botelho Junior, A. B.
[1]
;
Jimenez Correa, M. M.
[1]
;
Espinosa, D. C. R.
[1]
;
Tenorio, J. A. S.
[1]
Total Authors: 4
|
| Affiliation: | [1] Univ Sao Paulo, Escola Politecn, Dept Chem Engn, Prof Luciano Gualberto, Travessa 3, 380, BR-05508010 Sao Paulo, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Brazilian Journal of Chemical Engineering; v. 35, n. 4, p. 1241-1248, OCT-DEC 2018. |
| Web of Science Citations: | 0 |
| Abstract | |
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. (AU) | |
| FAPESP's process: | 12/51871-9 - Study Center for Technology in Waste Solid Treatment and Recycling - SCTWSTR |
| Grantee: | Jorge Alberto Soares Tenório |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 16/05527-5 - Separation of metals from sulfuric liquor of mining waste using chelating resins |
| Grantee: | Amilton Barbosa Botelho Junior |
| Support Opportunities: | Scholarships in Brazil - Master |