Abstract

CISNEROS-SANCHEZ, Deisy et al. Nickel hydroxide (II) synthesis with sulfide leaching multi-element solution from Caron technology. Rev.Colomb.Quim. [online]. 2021, vol.50, n.2, pp.49-57.  Epub Sep 09, 2021. ISSN 0120-2804.  https://doi.org/10.15446/rev.colomb.quim.v50n2.89644.

The most favorable conditions for the synthesis of nickel (II) hydroxide were determined by chemical precipitation, from the leached solution of nickel sulfide from the Caron technology. The leached solution with an ionic strength equal to 4.6 mol-L-1 was treated with ammonium and sodium hydroxides. Thermodynamic properties such as enthalpy, entropy, and free energy were calculated and predominance zone diagrams were constructed. The convenience of performing the process at 303 K, pH between 11 and 13, and ammonia concentration of 0.5 to 1.0 mol•L-1 was demonstrated. Under these conditions, high precipitation efficiencies of the metal cations from the initial solution were obtained. The precipitated solid was characterized by atomic absorption spectrometry and X-ray diffraction. Nickel (II) beta-hydroxide with the following chemical composition was obtained: 58.5 ≤ Ni ≤ 59.1%, 1.7 ≤ Co ≤ 2.1%, 0.5 ≤ Fe ≤ 0.6%, Cu, Zn, Mn and Mg ≤ 0.2%.

Keywords : Chemical precipitation; nickel beta hydroxide; predominance diagram.

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