VOL 93, No. 6 (2020)

The kinetics of the electroflotation process of extraction of TiO ₂ and TiN powders from wastewater has been investigated. Experimental results show that stationary values ??are reached in 20 & mdash; 25 minutes The degree of electroflotation extraction of titanium nitride powder without additive is low and amounts to 15 - mdash; 20 & # 37 ;. Introduction of anionic surfactant NaDBS and cationic SeptaSurfactant increases the degree of extraction in NaCl up to 50 - mdash; 65 & # 37; and up to 45 & mdash; 60 & # 37; in Na ₂ SO ₄. An increase in the degree of extraction of TiN is associated with the hydrophobization of the surface and an increase in the size of the particles of the dispersed phase. The highest recovery rates are obtained by adding coagulants and a coagulant - surfactant composition. In Na ₂ SO ₄ solutions, two compositions Al ³⁺ & mdash; NaDBS and Fe ³⁺ & mdash; NaDBS, the recovery is 96 & # 37 ;. High values ??of the degree of recovery are observed for TiO ₂ when adding compositions Al ³⁺ & mdash; Surfactant and Fe ³⁺ & mdash; Surfactant

A new technology for laser cutting glass along a curved contour is described, which combines the combined use of two different cutting methods in one technological cycle: the method of laser controlled thermal splitting on straight sections of the cutting contour and the filamentation method using a picosecond laser on curved sections of the contour. The proposed technology allows to significantly increase the productivity of the cutting process along a curved contour without deteriorating the strength characteristics of glass products

Nanocrystalline powders of LiZnMn ferrite were obtained by the method of solution combustion at various glycine-nitrate ratios (G / N = 0.2, 0.4,..., 1.4). Elemental analysis showed that the composition of the obtained samples corresponds to the spinel ferrite Li _0.45 Zn _0.05 Mn _0.06 Fe _{2 , 43} O ₄. Based on the SEM results, it was found that the compositions have a porous microstructure and a developed surface, and the X-ray phase analysis data indicate that the synthesized LiZnMnFe spinel is single-phase and has a high degree of crystallinity (up to 99 & # 37;). It is shown that the magnetic and dielectric characteristics of the obtained samples change systematically depending on the selected redox ratio of the reaction mixture and reach maximum values ??at a stoichiometric value of G / N = 0.6

A porous, catalytically active membrane based on coarse silicon carbide has been synthesized. To synthesize the membrane, ultradispersed additives of the eutectic composition of magnesium oxide and silicon carbide were introduced into the initial SiC powder, which, during sintering at temperatures in the range from 1100 to 1450 & # 176; C, form a liquid phase in the form of clinoenstatite MgSiO _{3, which wets the coarse SiC particles and forms a porous strong membrane framework. The dependence of the pore size of the ceramic material on the pressing pressure was investigated, which made it possible to obtain a highly porous ceramic membrane with pores of the most optimal size for the dehydrogenation of ethylbenzene to styrene. To give the synthesized membrane the catalytic properties required for the dehydrogenation process, the pore surface is modified to 10 & # 37; Re & ndash; W active ingredients using the alkox method}

The influence of underglaze paints in the form of solutions of cobalt and nickel salts on the formation of the structure of a porcelain article, especially in the zone of contact between porcelain and glaze, has been established. In this zone, salts change the character and size of crystalline neoplasms. Cobalt ions form compounds that are more soluble in the glass phase of porcelain and glaze than nickel ions, as evidenced by the color of the glassy layer of the glaze. With increasing salt content, a crystalline paint layer forms on both sides of the product.

The results of studying the morphology and optical properties of copper and fluorine-doped ceramic TiO ₂ films synthesized using electrolytic and solvothermal methods are presented. It is shown that the films obtained consist of oriented arrays of nanotubes with anatase crystal structure, narrow size distribution, and a high degree of hexagonal self-organization. The influence of the conditions of the solvothermal process on the composition, morphology, structure, and optical properties of the materials obtained has been established.

Obtained porcelain stoneware based on Russian raw materials at a relatively low temperature in the range of 1200 & ndash; 1250 & # 176; C. X-ray phase, IR spectroscopic and electron microscopic analyzes showed the presence of quartz, cristobalite, mullite and glass phase in porcelain stoneware, and the content of the latter is not less than 50 & # 37 ;. High physical and mechanical properties: strength, frost resistance, heat resistance, etc. & ndash; porcelain stoneware gives mullite

The results of studies on the use of fluorides of sodium fluoride NaF and sodium tetraborate (borax), as well as their mixtures in the synthesis of foam glass materials based on diatomite raw materials according to & # 171; hydrated & # 187; are presented. mechanism using an alkali solution. The influence of NaF and borax on the process of formation of the structure of the material and the mechanism of their action during heat treatment have been investigated. The optimal ratios of the charge components and the temperature-time regimes for the synthesis of foam glass materials with the use of these additives as materials intensifying the sintering and melting processes have been established.