Abstract
Iron(III) oxide prepared by the prefiring of jarosite compounds is used for the synthesis of spinel pigments, e.g. ZnFe1−xCr1+xO4. The reactivity of this iron(III) oxide towards zinc oxide decreases as the temperature and duration of the precalcination are increased. The conditions of jarosite compound decomposition significantly influence the colour of the ceramic pigment of Zn-Fe-Cr type too. As concerns the processing of jarosites for the production of H2SO4 and Fe2O3, the optimal conditions of their thermal decomposition are determined.
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