A technology has been developed for the production of glass-silica based on the wastes of enrichment of ferruginous quartzites of the Kursk Magnetic Anomaly (KMA) of the Lebedinsky GOK and fractionated broken glass of colored container glasses. The use of wastes of enrichment of ferruginous quartzites KMA allowed to reduce the sintering temperature and improve the quality of glass silica. The obtained glass silica has high operational and aesthetic-consumer properties.
The substantiation and development of a methodology for a comprehensive study of the physical and mechanical properties of ceramic compositions of the system grain - ceramic binder - pores using nonparametric regression analysis are considered. Its algorithm and implementation example are given.
The possibility of obtaining ceramic fibers of zirconium oxide by electrospinning is considered. The factors influencing the fiber diameter and the presence of tape inclusions have been established. It is shown that molding solutions under the action of an electric field make it possible to obtain fibers in a wide range of viscosities. When the values ??of the viscosities of the molding solutions are 0.45 & mdash; 0.69 Pa * s, the stability of the fiber production process is achieved, while the fiber diameter is comparable to the diameter of the fibers obtained by the traditional method (0.9 - 1.5 ?m)
It is noted that significant (but usually & # 171; shadow & # 187;) parameters of magnetic separation of liquid-dispersed media (suspensions, including ceramic, for the separation of the dispersed phase of impurities of ferroparticles) are their dynamic viscosity and density of the medium. The temperature dependences of the viscosity of the slip and its dispersion component (water) are compared, variants of their description in the operating temperature ranges by functions of exponential and logarithmic forms, respectively, are given, which may also be valid for other media, including those used for other, non-industrial, purposes. The functional form of such a dependence for a slip is used in basic expressions for the efficiency and limiting rate of its filtration magnetic separation - with a convenient in practice legalization of the slip temperature in these expressions
The issues of restoration of old brick buildings are considered. Compositions of new restoration dry building mixtures with increased operational properties, recommended for restoration work, are proposed. The results of physicochemical research methods (X-ray diffraction, electron microscopic) of the original hydrite binder and the restoration dry construction mixture obtained from it are presented. There is a list of technological operations for the restoration of the facades of brick buildings
When using almost all types of additive technologies, it is mandatory to use a binder with further heat treatment of the finished product. The binder compositions can be very diverse. Correct selection of the composition and properties of the ceramic powder - binder system at all stages of the process allows creating high-performance installations for producing parts of complex shapes. Presented are studies on the development of a binder composition for oxide aluminum-zirconium powders
The results of research on the production of fused materials based on kaolinite clay and high-alumina waste using a concentrated radiant flux are presented. The phase composition, microstructure, and elemental composition of the synthesized materials have been determined. It has been established that for the formation of an optimal microstructure in the form of acicular mullite with a multidirectional orientation, the most preferable is the mass content of the additive 10 - 20 & # 37; and the rate of cooling of the melt & # 8776; 10 3 & # 176; C / s
Hardening composite materials based on calcium phosphates (hydroxyapatite, monocalcium phosphate monohydrate) and polymer binders (polyvinyl alcohol, polyvinyl pyrrolidone) have been obtained. It was found that with an increase in the content of acidic calcium phosphate in the composition, the amount of brushite and tricalcium phosphate increases. The introduction of polymer binders into the composition of hardening composite materials increases their mechanical strength and inhibits the structural phase transformations of calcium phosphates at 800 ° C. Compositions
based on 5 & # 37; solutions of polymers and powders of hydroxyapatite or its mixture with a mass content of 10 - 40 & # 37; monocalcium phosphate monohydrate can be used as a consumable for 3D printing calcium phosphate biomaterials and ceramics
Various options for transport and technological schemes for unloading and storing substandard quartz sand used for the preparation of glass batch in compound shops are considered. The possibility of using quartz sand without additional processing in drying drums is noted. A method and a device for unloading bulk material from dump trucks with increased carrying capacity into receiving bins of small volume are presented.
The results of studies of performance indicators of samples of foam glass concrete building products are presented. For a more visual representation of the possibilities of using products in various conditions, the indicators are conditionally divided into strength and energy. Strength includes density and compressive strength, energy - thermal conductivity and moisture resistance. The qualitative results of the influence of the main parameters of the main filler of products - ground glass - on performance indicators have been investigated. Nomograms have been developed to determine the rational ratio of the output indicators of products in relation to various technical and operational requirements
