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Ryabyi D.V.,Donetsk National Technical University | Kondrukevich A.A.,Russian University of Chemical Technology
Refractories and Industrial Ceramics

Astudy is made of local (pitting) wear of the working layer of a periclase-carbon lining in a steel-pouring ladle used in a ladle-furnace unit without vacuum degassing of the steel that is being treated. The main causes of this type of wear are evaluated. © 2016 Springer Science+Business Media New York Source

Shcherbakov V.V.,Russian University of Chemical Technology | Artemkina Yu.M.,Russian University of Chemical Technology
Russian Journal of Inorganic Chemistry

The specific electrical conductivity (EC) of the KOH-H2O system was analyzed in the range 0-100°C. The maximal EC of KOH solutions for a given temperature and the concentration corresponding to the maximal specific EC were used as generalizing parameters. The values of normalized EC (the ratio of the EC to its maximal value for a given temperature) fall on one curve for temperatures over a range of 0-100°C and concentrations over a range of 0.01-12 mol/L if the normalized concentration (the ratio of the solution concentration to the concentration corresponding to the maximal specific EC) is used as the argument. The normalized EC values for NaOH-H2O and LiOH-H2O systems fall on the same curve. Analytical expressions fitting normalized EC as a function of concentration are given. © Pleiades Publishing, Ltd., 2010. Source

Tuzova S.Yu.,Russian University of Chemical Technology | Nikolaev A.Yu.,Russian Academy of Sciences | Nikitin L.N.,Russian Academy of Sciences | Pestrikova A.A.,Russian University of Chemical Technology | Gorbunova I.Yu.,Russian University of Chemical Technology
Russian Journal of Inorganic Chemistry

A new method is proposed for preparing redispersible polymers in supercritical carbon dioxide; this method makes it possible to reduce the number of stages and simplify the hardware embodiment of the synthesis process. © 2015 Pleiades Publishing, Ltd. Source

Kozak G.D.,Russian University of Chemical Technology | Tsvigunov A.N.,Russian University of Chemical Technology | Akinin N.I.,Russian University of Chemical Technology
Central European Journal of Energetic Materials

Properties that cause explosion hazard of organic peroxides, hydroperoxides and nitrocompounds are examined in the article. Ability to thermal explosion initiation of benzoyl peroxide and of nitrocompounds is compared. Explosion properties of peroxides are analyzed. Measurements of burning temperature by means of micro thermocouples and the comparison of their values with the calculated ones of benzoyl peroxide and hydroperoxide of isopropyl benzene lead to the conclusion that burning of them propagates in condensed phase. It is noted that heat instability of benzoyl peroxide burning, contrary to many nitrocompounds, is absent. Burning of benzoyl peroxide is stable even in vacuum. It is noted that, although benzoyl peroxide is not applied as explosive, in some cases the explosion hazard of benzoyl peroxide heating can be bigger than that of PETN. This conclusion was made on the basis of an investigation carried out by means of DSC method. The explosion process of benzoyl peroxide and hydroperoxide of isopropyl benzene propagates in a regime reminiscent of a low velocity detonation and the explosive effects are sufficient for severe destructions during accidents. This conclusion unfortunately is confirmed by bitter experience in practice. The results of the investigation of condensed products of explosion at impact of mixtures aluminum with peroxides and with nitrocompounds by means of impact-testing machine that were carried out in this work by X-ray diffraction analysis are discussed. It was shown that if the temperature of explosion of a mixture is T p ≥ 2200-2300 K, practically all aluminum or aluminum hydride in the mixture transformed into aluminum oxide. Source

Kolesnikov A.V.,Russian University of Chemical Technology | Gaidukov E.N.,Russian University of Chemical Technology | Kolesnikov V.A.,Russian University of Chemical Technology
Theoretical Foundations of Chemical Engineering

Kinetic trends of electroflotation extraction of sparingly soluble lanthanum compounds from solutions containing NaCl, NaNO3, Na2SO4, and Na2CO3 were established and studied. The role of surfactants of anionic, cationic and nonionogenic natures, as well as flocculants (first, of anionic and cationic type) that depend on background electrolyte composition (sulfate, chloride, carbonate, nitrate) is determined as positive. The electroflotation extraction of lanthanum hydroxide is shown to proceed with an degree of extraction of up to 96%. © 2016, Pleiades Publishing, Ltd. Source

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