Synthesis of nanopyroaurite using bauxite-washing residues as low cost starting material

•Bauxite-washing residues.•Chemical and mineralogical characterization.•Transformation into nanopyroaurite material.•Characterization by XRD, FT-IR, Raman spectroscopy and HRTEM-EDS analysis. In this work, nanopyroaurite was successfully obtained from bauxite-mining residues via co-precipitation and...

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Bibliographic Details
Published in:Materials letters 2019-01, Vol.235, p.246-249
Main Authors: Nascimento, R.S., Figueira, B.A.M., da Silva, L.N., Callejas, P., Telles, G.C., Lavra, T.C., Mercury, J.M.R.
Format: Article
Language:English
Subjects:
Bauxite
Bauxite-washing residues
Bayer process
Characterization
Chemical synthesis
Crystallization
Fourier transforms
Infrared spectroscopy
Materials science
Nanomaterials
Nanoparticles
Nanopyroaurite
Raman spectroscopy
Residues
Spectrum analysis
Synthesis
Temperature
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Summary:•Bauxite-washing residues.•Chemical and mineralogical characterization.•Transformation into nanopyroaurite material.•Characterization by XRD, FT-IR, Raman spectroscopy and HRTEM-EDS analysis. In this work, nanopyroaurite was successfully obtained from bauxite-mining residues via co-precipitation and hydrothermal synthesis. The effect of crystallization time and temperature on the formation of layered-type material were investigated. The product was characterized by XRD, FT-IR, Raman spectroscopy and HR-TEM with EDS analysis. The results revealed that bauxite residues could be transformed into aggregate nanoparticles with nanosizes around 50–60 nm, confirming the residues as raw material for the synthesis of nanomaterial.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2018.09.166