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THE WORK GENERAL CHARACTERISTIC

Research urgency. At reception of nickel from the sulphidic and acidifyed minerals use pirometallurgicheskie technologies which are interfaced to use of a considerable quantity of energy, allocation of toxic gases, significant losses with slags and pyleunosom.

Hydroengineering chemistries demand smaller power expenses and result in to decrease in an ecological damage. For working out of hydrochemical methods of extraction of nickel, research of processes of dissolution of its minerals, in particular nickelous sulphide (II) in sour environments is necessary.

In this connection search of reagents and definition of kinetic parametres of processes of dissolution NiS, and as details of the mechanism of its interaction with reagents is actual.

Despite the importance of discussed processes, in the literature practically there are no data on kinetics disolutions NiS received in the conditions of an equally accessible surface, and the mathematical models, allowing to count specific speed of interaction at simultaneous change of several influencing factors.

The present work is devoted research of kinetics of processes of dissolution of nickelous sulphide (II) in sour environments. As reagents, sulfuric acid, peroxide compound of hydrogen and the hydrogen nitrate, widely used in hydrometallurgy are used.

The basic part of the yielded work is executed by a method of the rotating disk providing ravnodostupnost surfaces in the diffusive relation and the most correct kinetic data about dissolution of solid matters.

The purpose and research problems. The work purpose consists in research of kinetics 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.

For object in view achievement problems are formulated:

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

- To position kinetic laws of interaction of nickelous sulphide (II) with solutions H2SO4, H2O2, HNO3;

- To construct mathematical models of studied processes and to make them fizikoyohimicheskuju interpretation;

- To define modes of passing of processes;

- To come out with the proved assumptions of mechanisms of the studied processes;

- To reveal limiting stages;

- To investigate influence of cations Cu2+и Fe3+на speed of dissolution millerita in sour environments;

- To investigate a condition of a surface of nickelous sulphide (II) at interaction with solutions of acids.

Scientific novelty and the practical importance of work. For the first time in the conditions of an equally accessible surface of a rotating disk dependences of specific speeds of processes of dissolution of nickelous sulphide (II) in solutions azotic, sulfuric acid and peroxide compound of hydrogen from concentration of a reagent, temperature, intensity of agitating and duration of interaction are studied. The mathematical models are received, allowing to calculate specific speed of dissolution of the specified sulphide at simultaneous change of the listed parametres. Interaction modes are positioned, details of the mechanism of the studied processes are defined. The proved schemas of the mechanism of interaction corresponding to observable kinetic dependences are offered.

The fundamental data received in dissertational work on kinetics and the mechanism of nickelous sulphide (II) can be used by working out of technological recommendations about extraction of nickel from sulphidic raw materials. The practical importance of scientific work is confirmed by award in 2012 of the grant of Fund Bortnika under the program "U.M.N.I.K", the state contract № 11706р/17152.

The personal contribution of the author. All results resulted in the dissertation are received or the author, or within the limits of cooperation in which he played a main role in the problem formulation, statement and carrying out of experimental researches, and also in the theoretical analysis and treatment of the received data.

Work is executed on chair of Chemistry of the Tver state technical university at cooperation with National exploratory Mordovian state university of a name of N.P.Ogaryov on a problem of hydrometallurgical extraction of nickel from sulphidic raw materials.

Work approbation. Dissertation original positions are reported and discussed at following conferences: the International scientific conference with the international participation “Chemical thermodynamics and kinetics” (Donetsk, 2011); XVII - XXII
The All-Russia scientific and technical conference of young scientists Physics, chemistry and new technologies: Regional Karginsky readings with the international participation (Tver, 2010-2015); Total scientific and technical conference on the program U.M.N.I.K. “Youth and innovations of the Tver area”: - 1 stage (Tver, 2012), - 2 stage. (Tver, 2014.гг.); III International scientifically-practical conference “the Domestic science during an epoch of changes: postulates of the past and the theory of new time” (Ekaterinburg, 2014); the Fifth International scientific conference “Chemical thermodynamics and kinetics” (Great Novgorod, 2015).

Publications. The basic results of research are published in 16 printed works, including in 7 articles from them 4 in the editions recommended VAK.

Volume and dissertation structure. The dissertation consists of the introduction, four heads, the conclusion and conclusions, the list of the used sources and appendices. Work total amount - 157 pages. In dissertations of 62 tables, 72 drawings. The list of the used sources includes 162 names of works of domestic and foreign authors.

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A source: PITCHUGINA Anna Igorevna. KINETICS of HYDROLYTIC And OXIDIZING DISSOLUTION of NICKELOUS SULPHIDE (II). The dissertation AUTOABSTRACT on competition of a scientific degree of a Cand.Chem.Sci. Tver - 2016. 2016

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