Astrelin I.M.

Structure and Morphology of Zirconium Oxide (IV) Powders Synthesiized by the Thermal Method from Different Precursors

ZrO2 powders were synthesized from different precursors by the thermal method: zirconium hydroxide (ZrO(OH)2) and zirconium oxalate (ZrOC2O4). In synthesized samples by XRD analysis it was researched phase composition; sample, synthesized from ZrO(OH)2, consists of, mainly, the monoclinic modification, and sample, synthesized from ZrOC2O4 – of the tetragonal modification. It was calculated crystal grates parameters of obtained ZrO2 powders by the method of XRS analysis.

Synthesis and Characterization of Nanodispersed Powders of Tin Oxide (IV) from Tin Oxalate (II)

We synthesize powders of tin oxide (IV) from tin (II) oxalate by thermal method with and without chemical pretreatment. The microstructures of samples are investigated by XR-diffraction and microscopic methods of analysis. We establish that the powders obtained by both methods have a tetragonal structure of rutile. It was determined that the sample obtained by chemical method followed by heat treatment, has a more porous structure than the sample obtained by thermal method. The lattice parameters and size of crystallite of the samples are calculated.

Turbidimetry Method of Evaluating the Nanoparticles Sizes in “White Zoles” ZrO2

We determine the possibility of employing turbidimetric method for the express evaluation of particles sizes in “white sols” of zirconium oxide (IV) synthesized by hydrothermal method. We define the phase content in zirconium oxide (IV) synthesized by this method, which mainly comprises the tetragonal modification. We find the particles sizes of zirconium oxide (IV) obtained employing the turbidimetric method, as well as by using the ZetaSizer device. Hence the particles sizes are 62 and 65 nm.

Study of hard water pre-treatment methods for membrane purification

This paper describes hard water pre-treatment and mineralization for subsequent water conditioning, using membrane methods. Furthermore, we show that application of ion exchange water softening at its preliminary preparation stage is appropriate on the condition that water hardness is less than 20meq/dm3. Through experiments performed, we prove that the antiscalants usage is efficient for water pre-treatment with a high level of noncarbonated hardness.

An Effective Reagent for Perufication of Flow Waters

In this paper, we make the comparative analysis of efficiency of flow waters perufication by coagulants on the basis of aluminium sulfate - industrial standard (Al2(SO4)318H2O) as well as a novel coagulant, synthesized by our technology. The efficiency of coagulants action is tested on the models and real standards of flow waters in the processes of perufication from lees, dyes, some ions of heavy metals. We also set the limits of рН efficient work of the synthesized standard.

The solvent sublation of iron ions from low concentration solutions

This study investigates the regularities of solvent sublation of iron ions from the low concentration water solution (CFe3+ = 10 mg/L). We determine optimal conditions of this process (the pH, the molar ratio of Fe3+: SAC, where SAC is the surface-active compound, the process duration, the temperature, the speed of gas flow). Relying on the ion association theory, we propose the mechanism of solvent sublation

The regularities of the flotoextraction process during the wastewater cleaning from the ions of heavy metals

Using the salts of unsaturated acids as surfactant, isoamyl alcohol and octan as an organic phase, we investigate the flotoextraction of heavy metals’ ions on the sample of nickel(II) ions. Moreover, we determine the optimum conditions for the process.

Investigation of the kinetics to reactions of joint hydrolysis of the ferric(ІІ) sulphate in whitness of carbamide

In this paper, we describe the kinetic features of a joint hydrolysis of the ferric sulphate with carbamide in water solution. Moreover, we determine the order of reactions, velocity constant, preexponential factor and activation energy. Through experiments performed, we obtain the equation of the dependency degree of the ferric sulphate hydrolysis from the process life.

The alkaline extraction of copper from galvanic dross

On the theoretical side, we investigate the possibility of chemical extraction of copper from galvanic dross. We study the processes of extracting copper from the model mixtures and original dross of ammoniac solution. Furthermore, we consider the electroextraction of copper from lixiviation solutions. An emphasis is laid on determining the technological conditions of extracting copper from galvanic waste production. Finally, we propose the fundamental technological scheme of reprocessing galvanic dross containing copper with the calculation of material balance.

The study of non-isothermal kinetics of the process of kaolin sulphatization furnacing

This study considers the non-isothermal kinetics of kaolin sulphatization process with obtaining the crude aluminium sulphate as a main product. Using the methods of non-isothermal kinetics ensures obtaining the principal kinetic constants of the process in the temperature interval 50–235 °С within the scope of one experiment. Moreover, we demonstrate that the sulphatization process proceeds in several stages and we calculate the kinetic parameters for every single stage. Through experiments performed, we obtain the kinetic equation of the process speed.