Kinetics of millerite and heazlewoodite dissolution in solutions of nitric acid

The paper presents the results of a study of the kinetics of hydrolytic and oxidative dissolution of Nickel sulfides in nitric acid. Dependences of specific speed of dissolution of copper cations (W, mol/sm2s) from concentration of hydrogen peroxide (Cn, mol/dm3), рН, temperatures (T, K), frequencies of rotation disk (ω, c−1) and durations of interaction (τ, c) are studied. The mechanisms of the interaction of millerite and heazlewoodite. The values of apparent activation energy and sulfides dissolution rate constant are calculated. Interaction modes are established, probable limiting stages of dissolution processes.