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Alkali fusion followed by a two step lea

Reginaldo José Farias da Silva, Achilles Junqueira Bourd Dutra

2026enzirconalkali fusionleachingzirconyl sulfatekinetics

Abstract

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This work describes the processing of a Brazilian zircon (ZrSiO4) concentrate via fusion with sodium hydroxide. The goal was to produce a zirconyl sulfate solution (ZrOSO4). The effects of NaOH/ZrSiO4 mass ratio, temperature and reaction time were investigated. The dried mass was leached with pure water, followed by leaching of the insoluble matter with sulfuric acid. The effects of temperature and liquid/solid ratio on water leaching were investigated, as well as the influence of temperature and acid concentration on ZrOSO4 purity. The best fusion conditions were: NaOH/ZrSiO4 mass ratio = 1.5:1; temperature, 575 °C; reaction time, 30 min. Water leaching was conducted with a water/ferred mass ratio, as acid leaching required 100 mL 3.0 mol L−1 H2SO4 g−1 water-insoluble solid at 25 °C. 97 wt.% of ZrSiO4 was decomposed and around 91.5 wt.% of Zr was recovered in the final product.

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Cite This Work

@article{658c1d48-91ac-4bb7-82d5-12fc080ae636,
  title={Alkali fusion followed by a two step lea},
  author={Reginaldo José Farias da Silva and Achilles Junqueira Bourd Dutra},
  year={2026},
  language={en}
}
TY  - JOUR
TI  - Alkali fusion followed by a two step lea
AU  - Reginaldo José Farias da Silva
AU  - Achilles Junqueira Bourd Dutra
PY  - 2026
LA  - en
ER  -

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