Use of tar pitch as a binding and reductant of BFD waste to produce reactive materials for environmental applications.

Autor: Amorim CC; Department of Sanitary and Environmental Engineering, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Minas Gerais 31270-901, Brazil. Electronic address: camila@desa.ufmg.br., Leão MM; Department of Sanitary and Environmental Engineering, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Minas Gerais 31270-901, Brazil., Dutra PR; Department of Sanitary and Environmental Engineering, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Minas Gerais 31270-901, Brazil., Tristão JC; Department of Chemistry, Universidade Federal de Viçosa, Florestal, Minas Gerais 35690-000, Brazil., Magalhães F; Department of Chemistry, Universidade Federal de Lavras, Lavras, Minas Gerais 37200-000, Brazil., Lago RM; Department of Chemistry, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, Minas Gerais 31270-901, Brazil.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2014 Aug; Vol. 109, pp. 143-9. Date of Electronic Publication: 2014 Feb 20.
DOI: 10.1016/j.chemosphere.2014.01.067
Abstrakt: In this work, a new approach is presented for the modification of the hazardous steel industry waste BFD (Blast Furnace Dust) into a versatile material for application in environmental remediation processes. Tar pitch, another waste, was used to agglomerate the very fine (submicrometric) dust particles to produce a compact and robust pelletized material that under simple thermal treatment produces notably reactive reduced Fe phases. SEM, TG/DTA, Mössbauer, XRD, Raman, BET and elemental analyses indicated that the tar/BFD composite (1:1wt ratio) pellets treated at 400, 600 and 800°C lead to tar decomposition to form a carbon binding coat concomitant with the reduction of the Fe oxides to produce primarily Fe3O4 (magnetite), FeO (wüstite) and Fe(0). Preliminary reactivity studies indicated that these treated composites, especially at 800°C, are active for the reduction of Cr(VI)aq and for the elimination of textile dye via reduction and the Fenton reaction.
(Copyright © 2014 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: