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research problem Statement

the Analysis of references shows, that the kinetics of acid dissolution of nickelous sulphide (II) is investigated insufficiently.

In the works published on this theme researches on powdery samples that complicates methodically correct interpretation of the received kinetic characteristics are executed.

In them there are no data on research of kinetics of dissolution of nickelous sulphide (II) in the conditions of an equally accessible surface, therefore it is represented expedient to investigate kinetics of oxidation of the specified sulphide in water solutions of oxidizers in the conditions of adjustable convection, with use of a method of a rotating disk.

reception of mathematical models of the investigated processes Is of interest, allowing to calculate size of speed of dissolution at various combinations of concentration of reagents, 33

temperatures, intensity of agitating and duration of interaction.

the work Purpose consists in research of kinetics of hydrolytic and oxidising process of dissolution of nickelous sulphide (II) in solutions azotic, sulfuric acids and peroxide compound of hydrogen methods of a rotating disk and full factor experiment. The choice of reagents is dictated both theoretical, and practical reasons. Azotic, sulfuric acid and hydrogen peroxide compound are widely used in hydrometallurgy. Hydrogen peroxide compound, besides, represents an intermediate product of the oxidising processes proceeding with participation of dissolved oxygen.

For object in view achievement it is necessary to solve problems:

- to synthesise and prepare modelling samples of nickelous sulphide (II) for carrying out of kinetic experiment;

- to position kinetic laws of interaction of nickelous sulphide (II) with solutions H 2 SO 4 , H 2 O 2 and HNO 3 by construction of mathematical models of processes and their physical and chemical interpretation;

- to define modes of passing of processes;

- to consider possible mechanisms of processes of dissolution;

- to reveal limiting stages;

- to investigate catalytic influence of cations Cu 2 + and Fe 3 + for speed of dissolution synthesised millerita in sour environments;

- to investigate a condition of a real surface of nickelous sulphide at interaction with water solutions of acids.

the Received kinetic characteristics represent fundamental interest and can be applied to perfection available and workings out of perspective technologies of its selective hydrochemical oxidation.

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A source: Pitchugina Anna Igorevna. KINETICS of HYDROLYTIC And OXIDIZING DISSOLUTION of NICKELOUS SULPHIDE (II). The dissertation on competition of a scientific degree of a Cand.Chem.Sci. Tver - 2015. 2015

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