VOL 75, No. 5 (2002)

The work of a pneumatic conveying installation of raw components of a glass batch is considered. Automatic control of the actuators of the installation based on the TA-23B pneumatic chamber pump is carried out using a microprocessor system and a control panel. Il. 1, bibliography: 2 titles.

The advantages and disadvantages of a high-pressure pneumatic pump in the conditions of production of porcelain and insulator factories are substantiated. The results of testing a prototype pump are presented. Il. 2.

A method for determining the geometric parameters of a glass ribbon in a bath with a tin melt has been developed, and the influence of forming conditions on these parameters has been investigated. Data have been obtained and systematized, giving a more specific idea of ??the processes occurring in various molding areas. It was found that the equilibrium thickness of the glass ribbon is formed under the influence of bead-holding machines, and not due to free spreading at the initial stage of molding, as was previously thought. Il. 2, bibliography: 5 titles.

On the basis of the drop model describing the inhomogeneous structure of liquidating glasses, a unified expression is obtained for calculating the effective value of the electrical conductivity and the diffusion coefficient of the cation depending on the total content of alkali oxide. The proposed model is consistent with experimental data for sodium and lithium silicate glasses. Tab. 2, ill. 3, bibliography: 6 titles.

The influence of the chemical and mineralogical composition of aluminosilicate rocks on the properties and structure of low-melting technical glasses has been studied. Comparative studies of glasses based on traditional glass raw materials - pegmatite and nepheline syenite, as well as unconventional ones - gelleflints and glasses from pure chemical reagents have been carried out. It was found that the use of various natural aluminosilicates in technical glasses does not significantly violate the modes of glass formation, but it makes it necessary to adjust the ratio of the main components and additives. Tab. 1, ill. 2, bibliography: 4 titles.

A generalization of the design and technological parameters of cooling grids at a critical air flow from nozzles for hardening glass of various thicknesses is proposed. Il. 3, bibliography: 3 titles.

Micropores in nanoporous ceramics prepared by pyrolysis of organosilicon polymers have been studied using the BET and mercury porosimetry methods. From the point of view of synergetics, an explanation is given for the low reproducibility of the obtained micropore structure. Bibliography: 7 titles.

With the help of model experiments carried out in the mode of linear heating of mixtures, which are promising refractory compositions: MCrO ₄ + Mg + MgO and MCrO ₄ + Al + Al _{2 O 3 (M = Mg, Ca, Ba), the temperature regimes of the combustion reactions are determined. All processes of interaction of components were carried out using solid in-reaction oxidants - chromates of alkaline earth metals, which were also products of self-propagating high-temperature synthesis. The resulting refractories, in terms of their structural and physicochemical characteristics, are not inferior to products synthesized using conventional technology. Tab. 1, ill. 3, bibliography: 4 titles.}

Conductive coatings have been developed that are formed on an enamelled steel substrate at low temperatures (560 - 580 ° C), which have good performance characteristics. Heating devices for both household and industrial use can be made on the basis of such coatings. Tab. 1, ill. 2.

Compositions have been developed using electrostatic precipitators dust to obtain thin films on sheet glass with heat-absorbing and decorative properties. The technique of transferring solid waste - a dye - into a solution has been worked out. The resulting films absorb 39 - 25% of heat rays in the infrared range of the spectrum. Tab. 3, bibliography: 4 titles.

The possibility of increasing the introduction of cullet into the batch (from 30 to 100%) in the production of rolled types of glass has been proven. A method is proposed for assessing the change in the redox potential of molten glass using data on the content of heterovalent iron and sulfur compounds in the glass composition. Tab. 2, ill. 2, bibliography: 8 titles.

The properties of clay shales of the Dzherdanak field (Uzbekistan) have been investigated. It was found that during their heat treatment, a mullite-like phase with an increased content of silicon oxide is formed. The possibility of obtaining refractories, porcelain and faience on the basis of raw materials from this deposit has been determined. Tab. 1, ill. 3, bibliography: 3 titles.