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Precipitation of impurities from synthet

Z. Zhu, Y. Pranolo

2026enlateritenickelcobaltneutralisationprecipitation

Abstract

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The precipitation of metals from a synthetic laterite leach solution was studied within the pH range of 4–7 at 40 °C with MgO and NaOH as neutralisation reagents. It was found that the precipitation order was Cr(III) > Al(III) > Cu(II) > Fe(III) at pH below 4.5, while the order changed to Cr(III) > Fe(III) > Al(III) > Cu(II) at pH above 4.5. The precipitation of chromium was almost complete (<0.2 mg/L) and only about 1 mg/L Al remained in the neutralised solution at pH 5.2, whereas precipitation of iron was almost complete (<0.2 mg/L) at pH 5.6. Copper and zinc were nearly completely precipitated (<0.2 mg/L) only at pH 7.0. Notably, nickel and cobalt were present in the precipitate even at a low pH of 4, much lower than their precipitation pH of 7.0, assumed to occur in two chemical forms: sulfate from chemical adsorption below pH 5.7 and hydroxide from co-precipitation above pH 5.7. Manganese, magnesium, and calcium showed no significant precipitation within the pH range of 4.0–7.0.

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@article{442f6b45-72f3-4fa8-b6b6-9757f5a7375a,
  title={Precipitation of impurities from synthet},
  author={Z. Zhu and Y. Pranolo},
  year={2026},
  language={en}
}
TY  - JOUR
TI  - Precipitation of impurities from synthet
AU  - Z. Zhu
AU  - Y. Pranolo
PY  - 2026
LA  - en
ER  -

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