Обоснование способов интенсификации выщелачивания медьсодержащего минерального сырья с позиции модели Лоренца

Based on the experiment and its interpretation in the framework of Lorenz model the ways of intensification of leaching copper from the poor mineral raw have been proposed.На основе эксперимента и его интерпретации в рамках модели Лоренца предложены способы интенсификации выщелачивания меди из бедного минерального сырья

An analysis of kinetic data on solution of metal oxides in terms of fractal geometry

The influence of the topology (fractal characteristics) of the surface on the character of the kinetic curves of solution of copper and iron oxides in acid media was studied, and methods for calculating the kinetic constants were suggested. The methods are based on applying heterogeneous kinetics principles and the use of the concepts of fractal dimensions of the volume and surface of particles undergoing solution

An analysis of kinetic data on solution of metal oxides in terms of fractal geometry

The influence of the topology (fractal characteristics) of the surface on the character of the kinetic curves of solution of copper and iron oxides in acid media was studied, and methods for calculating the kinetic constants were suggested. The methods are based on applying heterogeneous kinetics principles and the use of the concepts of fractal dimensions of the volume and surface of particles undergoing solution

Calculations of acid-base equilibrium constants from the pH dependence of the electrokinetic potential and potentiometric titration data on aluminum oxides and hydroxides

A comparative analysis of calculated acid-base equilibrium constants at the aluminum oxide(hydroxide)/solution interface is presented. The constants were obtained from the experimental pH dependences of the electrokinetic potential and potentiometric titration curves for Al2O3, AlOOH suspensions. The equilibrium constants and pHzcp values underwent displacement to the alkaline region as the degree of oxide hydration increased

Calculations of acid-base equilibrium constants from the pH dependence of the electrokinetic potential and potentiometric titration data on aluminum oxides and hydroxides

A comparative analysis of calculated acid-base equilibrium constants at the aluminum oxide(hydroxide)/solution interface is presented. The constants were obtained from the experimental pH dependences of the electrokinetic potential and potentiometric titration curves for Al2O3, AlOOH suspensions. The equilibrium constants and pHzcp values underwent displacement to the alkaline region as the degree of oxide hydration increased

Calculation of thermodynamic acid-base equilibrium constants at oxide-electrolyte interfaces from experimental electrokinetic potential versus pH data

A procedure is described for determining the parameters of the electrical double layer and acid-base equilibrium constants at oxide-electrolyte interfaces from the pH dependence of the electrokinetic potential when there is no specific adsorption of ions. The procedure is used to calculate the parameters of the electrical double layer and acid-base equilibrium constants for 20 oxides. At a given background electrolyte concentration, the dependence of the calculated parameters on the difference pH - pH(0) is insensitive to the nature of the oxide

Interaction between lanthanide cuprates and hydrochloric acid

The interaction between lanthanide cuprates Ln2CuO 4-δ (Ln = La-Gd) and hydrochloric acid is investigated. The effects of solution pH, temperature, and the nature of the rare-earth element ion on dissolution is studied. The formal order of the reaction in the acid is the same for all the substances under study and is 0.53 ± 0.05. The effective activation energy for the process is 40 ± 0.5 kJ/mol. A scheme of Ln2CuO4-δ interaction with HCl is proposed. © Pleiades Publishing, Ltd., 2011

Complexone effects on the kinetics of solution of copper(II) oxide in acid media

The influence of complexones (hydroxyethylenediphosphonic acid, ethylenediaminetetraacetate, and diethylenetriaminepentaacetate) on the kinetics of solution of copper(II) oxide in acid media was studied. The decelerating action of the complexones was found to be related to the formation of surface complexes of copper, which decrease the number of active solution sites on the surface of copper(II) oxide. The products of solution were studied. A mechanism of the inhibiting action of complexones was suggested and given a quantitative description. The mechanism is based on the assumption that the rate-determining step of copper(II) oxide solution in solutions of complexones is transfer of the complexes formed in the reaction from the surface into solution