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首页> 外文会议>XXI International Mineral Processing Congress >NON-EQUILIBRIUM THERMODYNAMICS IN THE OXIDATION AND FLOTATION OF SULFIDES
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NON-EQUILIBRIUM THERMODYNAMICS IN THE OXIDATION AND FLOTATION OF SULFIDES

机译：硫化物的氧化和浮选过程中的非平衡热力学

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Results of both theoretical studies, based on principles of chemical thermodynamics and electrochemistry, and experimental research show that physic-chemical interactions in aerated flotation pulps refer to "quasi-equilibrium" processes. They proceeds on the background of continuous spontaneous sulfide oxidation by corrosion mechanism, include cathode reduction of adsorbed oxygen, anode oxidation of metal sulfide, and heterogeneous chemical reaction of formation of secondary low-soluble products. A concept of proceeding associated red-ox reactions allows for the advancement of the new description of a mechanism for oxidizing semi-conductive minerals, and the regularities of formation of adsorption layer at mineral surface in conditions of variable ionic composition of pulp liquid phase. The model described for oxidizing sulfides in aerated aqueous solutions and pulps allows to quantitatively describe the stationary states of non-equilibrium processes, associated with the selective flotation of minerals from sulfide complex ores. In this case, a kinetics of the process may be determined from corrosion current density, and a composition of reaction products can be found using plots of thermodynamic stability of corresponding systems. The method, elaborated for physico-chemical modeling of separation processes, is based on the determination of typical models for the sub-processes of mineral-reagent interactions at continuous oxidation. These models involve the description of the changing relationship required among concentrations of ionic and molecular components of pulp and energy state of mineral surface when transferring from optimum flotation conditions to optimum depression conditions. The models allow taking into account the changing phase composition of reaction products in flotation systems, the genesis and the crystallo-chemistry of minerals.
机译：基于化学热力学和电化学原理的理论研究和实验研究的结果均显示，充气浮选浆中的物理化学相互作用是指“准平衡”过程。它们以腐蚀机理连续自发地进行硫化物氧化为背景，包括吸附氧的阴极还原，金属硫化物的阳极氧化以及形成次要低溶度产物的异质化学反应。进行相关的氧化还原反应的概念允许对用于氧化半导体矿物的氧化机理的新描述进行改进，以及在纸浆液相的离子组成可变的条件下在矿物表面形成吸附层的规律性。所描述的用于在充气水溶液和纸浆中氧化硫化物的模型可以定量描述非平衡过程的稳态，这与从硫化物络合物矿石中选择性浮选矿物有关。在这种情况下，可以从腐蚀电流密度确定该过程的动力学，并可以使用相应系统的热力学稳定性图找到反应产物的组成。为分离过程的物理化学建模而精心设计的方法，是基于确定连续氧化作用下矿物质与试剂相互作用的子过程的典型模型而确定的。这些模型涉及从最佳浮选条件转换到最佳凹陷条件时，纸浆中离子和分子成分浓度与矿物表面能态之间所需的变化关系的描述。该模型考虑了浮选系统中反应产物的变化相组成，矿物的成因和结晶化学。

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