A study on geopolymerization of iron ore tailings.
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Data
2019
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Resumo
Geopolymers are a relatively new technology, which is pointed as a potential alternative to the
ordinary Portland cement for some applications. The need for an alternative to this binder comes
from the environmental problems related to its production process and the tremendous volume
of non-replaceable resources extracted to its production. Considering the importance of
ordinary Portland cement, to find a suitable alternative binder is a hard task. At the same time,
the re-application of industrial by-products from several productive sectors is an effective
management way to save non-replaceable resources as well as a correct destination. In this
sense, the main objective of this study is evaluating the feasibility of the iron ore tailings as a
raw material to the production of geopolymeric composites. Additionally, two blend materials
and fine aggregate were applied and verified the influence and effects on the geopolymer final
properties. Were applied a solution of sodium hydroxide at three different molar concentrations
(8, 10, and 12 mol/l) and curing temperature of 100 °C. A depth characterization procedure was
applied in all raw materials and blend used in this work. The performance of the obtained
geopolymer was observed over mechanical strength, physical properties, dimensional stability,
and microstructural analysis. The experimental procedure enabled a closely understand of the
geopolymeric synthesis and kinetics, influence of specific aspects on the geopolymerization
and final properties, and the role of iron in this process. The experimental results showed that
the geopolymer based on iron ore tailings is an efficient binder with interesting properties to
construction industry. Finally, the geopolymers derived from iron ore tailings rise as an
interesting construction material.
Descrição
Programa de Pós-Graduação em Engenharia Civil. Departamento de Engenharia Civil, Escola de Minas, Universidade Federal de Ouro Preto.
Palavras-chave
Rejeito de barragem de minério de ferro, Geopolímero, Difração de raio x, Microestrutura
Citação
SILVA, Keoma Defáveri do Carmo e. A study on geopolymerization of iron ore tailings. 2019. 92 f. Tese (Doutorado em Engenharia Civil) - Escola de Minas, Universidade Federal de Ouro Preto, Ouro Preto, 2019.