Ceramics-Silikáty 45, (4) 121 - 127 (2001) |
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MISCIBILITY OF CuO, NiO, AND ZnO IN THEIR BINARY MIXTURES AND ITS IMPACT FOR REPROCESSING INDUSTRIAL WASTES
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Grygar Tomáš 1, Salátová Zuzana 2, Vorm Petr 1
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1 Institute of Inorganic Chemistry,
Academy of Sciences of CR,
250 68 Řež, Czech Republic
2 Institute of Chemical Technlogy,
Technická 5, 160 00 Prague, Czech Republic
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Keywords: CuO, NiO, ZnO, Solubility, Dissolution
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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. |
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