The process of interaction of bismuthate-borate glasses with the composition (mass content, %): 70 Bi2O3, 30 B2O3; 70 Bi2O3, 27 B2O3, 3 MoO3; 70 Bi2O3, 26.94 B2O3, 3.06 GeO2 and bismuth glasses of composition (mass content, %): 80 Bi2O3, 7 SiO2, 10 GeO2, 3 MoO3 with orthophosphoric acid. The kinetics of this pro-cess is described and the activation energies are calculated. It is shown that, at short interaction times, the process is limited by the stage of the chemical reaction; with increasing time, the stage of diffusion through the sediment layer begins to play the main role in the heterogeneous interaction. The optimal parameters of the chemical processing of glass were selected – 15 min at 373 K
The effect of Al2O3 addition introduced by the substitution method on the crystallization and spectral-luminescent properties of gallium germanosilicate glasses with ?-Ga2O3:Ni2+ nanocrystals was studied. An enhancement of the Ni2+ luminescence efficiency has been revealed. It is caused by both an increase in the degree of crystallization of glasses with Al2O3 and an increase in the crystal field strength around Ni2+ ions due to the incorporation of Al3+ into the structure of the precipitated nanocrystals
The article analyses a system for the technological regulation of Negative Environmental Impact (NEI) based upon the Best Available Techniques (BAT) concept. The authors demonstrate the necessity for updating Russian BAT Reference Document on Glass Production and clarifying the technological parameters for resource efficiency and environmental performance of production. It is proposed to regulate the secondary NEI sources by General Binding Rules. The authors emphasize that resource efficiency parameters could be used to calculate the carbon intensity indicators for glass products. These indicators could be applied for industrial greenhouse gas emissions regulation in Russia
The fundamental possibility of obtaining corundum ceramics with density close to theoretical, with defect-free polished surface, with low roughness, using as a starting material finely dispersed non-aggregated electrocorundum modified with magnesium oxide with nano addition of aluminum oxide during sintering under SPS conditions
A study of the influence of the addition of aluminosilicate cenospheres (ASC) of 2 fractions on the structure and properties of ceramics with waste from the production of mineral wool (MW) was carried out. The effect of different amounts (from 10 to 30%) and different fractions (0.125 – 0.250 mm) and less than 0.125 mm ASC on the physical and mechanical properties of ceramic specimens after firing at temperatures of 1000 – 1080 °C was determined. It has been established that the combined use of MW as a non-plastic additive and ASC of 2 different fractions makes it possible to obtain durable lightweight ceramics with low shrinkage and high porosity
The necessity of developing a new design of the pendulum clamshell for the formation of mineral wool products is shown. One of the possible variants of the design of mechanical-driven pendulum clamshells has been developed, its structure and operating principle have been described. Analytical dependences for calculating the design parameters of a pendulum clamshell are given, which allow determining their optimal values. As an example, the parameters of the kinematic scheme of a pendulum clamshell for industrial applications are calculated
We compared the granulometric composition of raw and acid-activated rocks containing aluminosilicates. We showed that during the presence of rocks in water, they gradually dissolve with a simultaneous decrease in the particle size, which is associated with the disaggregation of large particles, the diffusion of water into the interparticle space and the hydrolysis of aluminosilicates. We studied the effect of acid treatment on the adsorption-structural characteristics of diatomite. We showed the possibility of using of granulometry for a rapid assessment of the operational properties of acid-activated sedimentary rocks
The study of the ZnO–SnO2 system was carried out, in particular, the possibilities of the synthesis of zinc orthostannate were considered. The temperature of the synthesis of a compound from simple oxides by solid-phase synthesis has been established. Obtained ceramics based on zinc orthostannate with additives 5; 7.5; 10 mol. % NiO and 5; 7.5; 10 mol. % MnO. The properties of the powders were studied using XRD, SEM, and BET. The synthesis temperature of dense ceramics was 1450 °C
The magnetic and some physicochemical properties of glasses based on barium-borosilicate eutectic with additions of iron and lithium oxides have been considered. Increasing in the Fe2O3 content leads to an in-crease in the magnetic permeability. The combined introduction of Fe2O3 and Li2O has no effect on the magnetic permeability. The formation of structural configuration of barium hexaferrite in glass is responsible for the magnetic properties. According to EPR data, a part of iron ions is present in tetrahedral coordination, incorporating into the structural glass network, and the other part is present in the octahedral coordination acting as a modifier
With an increased (in comparison with conventional water treatment) concentration of ozone, pesticides and hydrocarbons are effectively eliminated from water, while elimination without ozonation requires activated carbon.
Currently, the most widespread method of ozone production is its generation in the area of barrier discharge in an ozone generator. However, the performance of this equipment directly depends on the service life of the dielectric barrier, which is primarily determined by the intensity of the impact on the dielectric directly by the electric field and the high-temperature effect of the microdischarge channels, as well as by the dielectric barrier material (insulating enamel). The use of enamels makes it possible to significantly reduce the thickness of the dielectric barrier, increase the power and productivity of the ozone generator, improve the conditions for electrodes cooling, and makes it possible to create high-frequency ozone generators operating at high-frequency currents. Also, important advantages of enameled electrodes are simplicity of design, small dimensions and low specific quantity of metal. The mass of such equipment with the same performance is 10 times less than a low-frequency one. At the same time, thermal coefficient of linear expansion values level must be the same as the metal. The highest values of dielectric properties are characteristic of low-alkali and alkali-free glasses and enamels containing a minimum number of current carriers: they have higher electrical resistance and lower dielectric losses than alkaline compositions. According to literature, SiO2–PbO–B2O3–Sb2O3 chemical system glasses were selected as objects of research to obtain Pb silicate enamels, which are characterized by good flowability and high adhesion to steel, as well as high chemical resistance. When firing Pb enamels, chemical processes take place at the metal-enamel interface, which create a strong adhesion of the enamel to the substrate
