2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 3: Takano Intl. Symp. / Metals & Alloys Processing
| Editors: | Kongoli F, Noldin JH, Mourao MB, Tschiptschin AP, D'Abreu JC |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 550 pages |
| ISBN: | 978-1-987820-26-3 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Influence of the Binder on the Mechanical Properties and on the Reduction Process of the Chromite Self-Reducing Pellets
Cyro Takano1; Adolfo Zambrano2; Marcelo Mourao1; Solon Tagusagawa1; Alberto Nogueira1;1UNIVERSITY OF SAO PAULO, Sao Paulo, Brazil; 2PONTIFICIA UNIVERSIDAD CATOLICA DEL PERU, Lima, Peru;
Type of Paper: Regular
Id Paper: 72
Topic: 3
Abstract:
In this work, the influence of the binders on the mechanical properties at high temperatures and on the reduction process of the chromite self-reducing pellets were studied.
Compression strength was evaluated at room temperature after submitting them to the temperatures of 1173, 1273, 1373, 1473 and 1573. Bentonite, hydrated lime, molasses, carboxymethyl cellulose (CMC) and sodium silicate were tested with different contents.
Initially, all the materials (chromite, ferrosilicon, petroleum coke and binder) were characterized by chemical analysis and particle size. After this, the materials were agglomerated as 15 pellets (P1 to P15). The compression strength was measured for green pellets, during curing period for 28 days, after drying and after submitting at high temperatures profiles. Decrepitation tests were also done. After reduction experiments, at 1773K, the products obtained (slag and metal) were analyzed by SEM and EDS. The best performance was obtained by the pellet P15 (4% sodium silicate as binder): it reached a compression strength of 5 kg-f/pellet (dry pellet) and of 15 and 15.5 kg-f/pellet, after heat treatment at 1173 and 1273K, respectively. None of tested pellets presented decrepitation. The pellet P15 achieved unitary reaction fraction, after 10 minutes at 1773K. It was observed slag formation after 3.5 minutes, harming the reaction CO/Chromite.
Keywords: Ferrochromium, Self-reduction, Self-reducing pellets, Chromite.
Keywords:
Composite; Pellets; Process;References:
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