ТЕРМОДИНАМИЧЕСКОЕ ОБОСНОВАНИЕ ПРОЦЕССА СУЛЬФИДИРОВАНИЯ ОКИСЛЕННЫХ МЕДНЫХ МИНЕРАЛОВ СЕРОЙ
Investigation of the methods for hard-to-beneficiate and mixed ore processing is currently the main scientific and technical challenge in non-ferrous metallurgy. High-temperature sulphidation of oxidized copper minerals in practice is rather complicated, economically is not profitable, therefore only low- In the Teghut mine, a zone of oxidized copper rocks with a relatively rich mineralization is distinguished. In the oxidized zones, there are copper minerals: tenorite - CuO, cuprite - Cu2O, azurite - Cu3(OH)2[CO3]2, malachite-Cu2(OH)2[CO3], and also, in limited quantities, turquoise - CuAI6 (OH)8[PO4]4.4H2O. When beneficiating such copper minerals, a more acceptable type of surface activation is the process of mechanical activation in combination with adding reagents. The method of the deep sulphidation of the surface of oxidized ore minerals with the given physical and chemical properties is based on the distortion of the crystal structure of the ore. The influence of the mechanical energy on the crystal structure increases the number of defects and, affecting the process of structural and chemical transformations, the process of sulphidation takes place in the sulphuric environment, which reduces the degree of defectiveness and internal energy. The degree of imperfection of minerals affects flotation. To determine the probability of the interaction reactions of oxidized copper minerals with sulphur, thermodynamic calculations were initially carried out. As a criterion for the reaction under conditions of constant pressure and temperature, the Gibbs energy lowering theory G was adopted. The Gibbs energy was calculated by the Temkin-Schwartzman method of redox reactions at temperatures K: 308, 318, 328, 338, 348. In order to obtain comparative data, calculations were performed for 1 mole of sulfidization. A thermodynamic calculation was first used to substantiate the technological process of deep sulphidation of Teghut oxidized copper minerals on the surface, which is carried out in the processes of grinding and crushing azurite, malachite, cuprite and tenorite in the presence of sulphur. It was shown that the interaction occurs with a large negative value of the energy of Gibbs, which is necessary to obtain copper sulphides for further flotation.