The article presents the results of a mathematical model development for the process of gold leaching from gold-containing ores and concentrates. A mathematical model has been developed by analyzing the chemistry of reactions and mass transfer processes. On the base of a kinetic extraction model and a hydrodynamic complete mixing model a mathematical model of thiosulfate leaching process in various types batch reactors, complete mixing flow process vessels and complete mixing reactor columns with different numbers of vessels in a column has been developed. The effect of the number of reactors in a column has been investigated and optimal segmentation conditions have been found. Based on the investigation of the process using the mathematical model a control system structure has been designed to provide maximum conversion at the exit area of a reactor column.
Main features of purification of recycled water of industrial enterprises have been considered. It has been shown that using membrane methods of purification allows to remove of dissolved metals salts from recycled water and to bring their concentration to standardized level. Using this method doesn’t require such large energy consumption as evaporation method. The analyze of membrane purification methods have been fulfilled. Mathematical model of this process has been developed. The solution algorithm has been developed and some results of simulation of membrane purification have been presented.
The method of recovery the refractory sulfide ores with the aid of pressure oxidation was examined. The basic processes of oxidation was discovered and the mathematical description of the process of sulfide oxidation in a heterogeneous system, the liquid – solid, was suggested. The ReactOp allowed to solve inverse problem – determination of kinetic parameters (E = 112 kJ/mol, ln(K) = 20 m/s) from the experimental data. On the basis of defined parameters is made and investigated the cascade of continuous stirred-tank reactors.
The article considers the role of the lining in the tubular rotary kilns used for heat treatment processes of raw material in the metallurgical, chemical and other fields of industries. The method of selecting a new design thermal insulation elements, ensuring reduction of heat loss to the environment and more accurately to provide the required thermal processing mode through simulation can be used with ANSYS FLUENT software package. A system of monitoring the state of the lining with a thermal imager and control system that provides consistency lining without stopping the operating kiln has been developed.
This article is devoted to the study of the kinetics and the development of kinetic models of chemical reactions of minerals that occur during roasting and sintering of alumina in the tubular rotary kiln. To study the kinetics was used DSC firm NETSCH. Determination of kinetic constants and thermal effects of the individual stages were performed by solving the inverse problem in the environment of software system ReastOp. The experimental responses were used in sample mass change with time and heat speed (heat absorption).
the method of circulating industrial waters treatment from metallurgical works with high content of phosphates is considered. It includes treatment via reagent precipitation with alkalization and flocculant addition, filtration of residue on a press-filter, further purification of water on a filter with granular loading, purification from residual calcium on an ion-exchange filter, neutralization of softened water and its final desalting in the unit of reverse osmosis.
Possible reasons arising destroying of storage and apparatuses for potential hazard materials have been analyzed. Thermal explosion has been indicated as one of most impotent reasons of destroying chemical reactors and storages. Basic equations for describing of this phenomena have been evaluated for different type geometry and conditions of heat exchange on outside surface. Numerical procedures have been proposed and tested for solving and analyzing of evaluated equations with using special program package ThermEx. Processes of evaluation arising clouds of hazard substances have been considered. Basic mathematical equations have been proposed for analyze of considered processes. The procedure for solving of considered problems has been proposed and tested on base of special program package ReactOp.
