Ceramics-Silikáty 45 (4) 121-127 (2001)

MISCIBILITY OF CuO, NiO, AND ZnO IN THEIR BINARY MIXTURES AND ITS IMPACT FOR REPROCESSING INDUSTRIAL WASTES

T. Grygar, Z. Salátová, P. Vorm 

Miscibility of the components in the binary oxide systems containing CuO, NiO, and ZnO were studied using their dissolution in diluted H₂SO₄ combined with the examination of the oxides lattice parameters obtained by powder XRD. In samples synthesized by heating the corresponding mixed hydroxides at 900 °C in air the following miscibility limits were found: 15 mol.% CuO and 26 mol.% ZnO in bunsenite (cubic NiO), 0.8 mol.% NiO and 1.2 mol.% ZnO in tenorite (monoclinic CuO), and 1.6 mol.% CuO and 0.5 mol.% NiO in zincite (hexagonal ZnO). The data are generally comparable or lower than those available in literature. The miscibility limits are of crucial importance for the recovery and purification of Cu, Ni, and Zn from the industrial sludges by a simple metallurgical scheme, which is currently tested in a laboratory scale.

Keywords: CuO, NiO, ZnO, Solubility, Dissolution