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Kaluga, Russia

Bortnikov A.V.,CJSC | Kutolin V.A.,RAS Institute of Geology and Mineralogy | Samukov A.D.,RAS Institute of Geology and Mineralogy | Spiridonov P.A.,RAS Institute of Geology and Mineralogy | And 2 more authors.
Obogashchenie Rud | Year: 2014

The paper describes the compositions of raw materials, conventionally used for mineral cotton production. These raw materials are characterized by quite high costs and short supply. However, in the territory of Russia, billions of tons of mineral ore processing waste materials have been accumulated, and these tailings storage growth continues, causing environmental pollution. Obviously, such inexpensive raw materials should be studied with respect to possible utilization as a main mix component in production of high-efficiency thermal and sound insulation material - mineral cotton. The mix in question shall comply with the main criteria of application, including acidity index (at least 1.4-2.0, depending on type of mineral cotton) and mix molten viscosity (3-10 Pa·s), providing for super-thin fiber formation by means of air blowing. The paper proposes a possible mix preparation technique for mineral cotton production from crushed granitoid and dolomite stone screenings, a certain combination of which theoretically provides for the required acidity index, low melting temperature and the required molten viscosity of mix. It was verified through the experimental testing, that 80 % granite dust and 20 % limestone mix satisfies with all criteria to the required mix.

Grubich A.,CJSC
Journal of Environmental Radioactivity | Year: 2015

The influence of the variation of soil density and the uncertainty of activity measurements on the statistical distribution of radionuclide concentrations on a site is considered. It is demonstrated that the influence of these factors adequately explains the observed deviation of radionuclide empirical probability distribution functions (empirical PDFs) from lognormal. In all probability lognormality of activity density distributions is the consequence of the atmospheric fallout process, as observed for deposition from Chernobyl and Fukushima. The results obtained are in no way specific to radioactive contaminants, and are consequently applicable for depositions of non-radioactive pollutants as well. © 2015 Elsevier Ltd.

Maksimov I.I.,CJSC | Otrozhdennova L.A.,CJSC | Zavarina R.I.,CJSC | Yegorova V.G.,CJSC | Belov A.Y.,CJSC
Obogashchenie Rud | Year: 2014

A technology, developed for beneficiation of sulfide copper ores with low lead content, requires addition of potassium bichromate into sulfide copper flotation cycle in order to increase copper concentrate grade through depression of lead minerals, remaining in flotation slurry. Potassium bichromate consumption is 225 g/t, with that, Cr (VI) ions concentration in flotation tailings exceeds the sanitary norms several times over. The paper presents a brief review of application of waste water purification methods from Cr (VI) compounds by means of reagents, as described in the literature. It is shown, that reducing agent dosage depends on Cr (VI) starting concentration in waste water and upon pH of purified water. Sodium sulfite was applied for waste water purification from Cr (VI) compounds, and tested for a wide pH range. It was established, that the best results were provided through decrease of starting water pH (pH = 8) to pH = 3 by means of its acidization. Waste water heating was not required.Two stages of purification from Cr (VI) and Cr (III) were joined into one operation through addition of solid flotation tailings to purification cycle. Duration of purification operation was ∼ 15 min. The paper presents the purification circuit flow sheet, and shows Cr (VI) and Cr (III) contents in discharged water - 0.01 and 0.03 mg/dm3, respectively. © 2014 John Wiley & Sons, Ltd.

Fedorov V.A.,CJSC | Mil'Man O.O.,CJSC | Shifrin B.A.,CJSC | Anan'Ev P.A.,CJSC | And 3 more authors.
High Temperature | Year: 2014

This article presents new results of an experimental study of the process of condensation of superheated water vapor inside inclined tubes as applied to air-cooled condensers of steam-turbine plants. © 2014 Pleiades Publishing, Ltd.

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