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.
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.
A kinetic gold leaching model, based on the well-known shrinking core model, is presented in this work. The model considers the effects of internal diffusion, surface reaction and unreacted amount of gold in the concentrate particle during leaching. The model parameters are estimated by minimization of mismatching between experimental data and results of numerical computation of kinetic model made by using ReactOp software.
This article describes a mathematical model to estimate the thermophysical properties of insulation of pipelines and the development of a new type of insulating material. It is proposed to use a cellular structure insulating material, filled with air for thermal heating systems. Its effectiveness is confirmed by calculations performed using a mathematical model.
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.
Last years in all spheres of the industry the requirement for the new automated control systems has sharply increased. Management information systems new also are necessary in manufacture of precious metals from waste products of electrotechnical manufactures. In given clause main principles of designing of the automated system of process электролиза are resulted at processing a radio-electronic breakage.
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.
The article is devoted to system «Ore pretreatment» of automation of process of enrichment of factory on extraction of diamonds. Work of a site рудоподготовки and its equipment, the basic purposes and problems of introduction ASUTP «Ore pretreatment» is briefly described, the basic contours by means of which introduction, stabilization and optimization of corresponding technological parameters is reached are resulted.
The kinetic equation describing regularities of kinetics of the process of sweet roasting of the sulphide nickeliferous concentrate is offered. The considered method allows objective calculation of the time-limit of completion of investigated process. The equation can be used for the specification statement of regularities of different heterogeneous processes.
On the basis of earlier received of process of decomposition in thedevice of periodic action the mathematical model of process of decomposition in a flow reactor of full hashing in view of input of a priming in a feed is made. On the basis of the received model in a flow reactor the mathematical model of process of decomposition in the cascade of 14 rectors flow type has been developed. Models are made in the inveroment of program complex ReactOp. The solution of the equation of model has been carried out by a stabilization method.
Mathematical description of the furnace in the complex modeling software in ReactOp reactors is done. Control model on the basis of which model the melting liquid bath and device management package Matlab using visual modeling tool Simulink is presented. Simulation results provide for the parameters of the process, change the variables of furnace about changing the nominal values of oxygen, and as a consequence changes in temperature are analysed. Data on the effects of temperature on the amount of slag, stain and gas are presented. Control system based on the work done to create a system that would ensure a more stable and efficient flow processes in a furnace and improve the quality of the product.
The essence of process of roasting charge on clinker was considered. The model of a rotating furnace was constructed in software package ReactOp. Dependences of the basic components processed charge on length of the furnace of sintering and the general change of the basic mass streams were found.
Regularities of particle residence time distribution in the pilot fluidized bed furnace with return cyclones are investigated. The parameters of curve functions of particle residence time distribution at the furnace outlet for cinders and dust at the outlet from the return cyclone were determined: average residence time, dispersion and number of cells in the cell model. It is established that the flow structure in the studied fluidized bed furnace is close to the model of ideal mixing.
The article focuses on research aimed at improving fuel combustion devices, processing of gaseous energy carrier to ensure volumetric combustion by preliminary mixing of energy carrier with air and giving the burning fractions buoyancy by mineral additives due to adhesion and increasing their efficiency and reducing environmental pollution.
