Abstract
ABSTRACT Exchange isotherms and pH curves at 25.0, 40.0, 55.0 and 80.0°C are obtained. The hydrolysis degree and the amount of metallic phosphate precipitated are determined. The evolution of the solids is followed by X-ray diffraction. The substitution increases with temperature, reaching at 80.0°C the 70% (Ca2+) and the 90% (Cu2+). The results are compared with those obtained by using (CaCl2 + HCl), (CaCl2 + Ca(OH)2) or (CuSO4 + H2SO4) solutions.
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