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The modeling of dissolution of cobalt, nickel, and iron oxides in sulfuric acid shows that the rate determining step of the dissolution is the passage of oxide complexes formed on the surface of oxide particles to a solution. A system analysis of the dissolution curves (α-τ) of the oxides is developed to calculate the kinetic parameters ( E a ). Cobalt oxide Co 3 O 4 dissolves in H 2 SO 4 more rapidly than nickel and iron oxides (Ni 2 O 3 and Fe 2 O 3 ).

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