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Hannachi Y.,Belgorod State Technological University | Shapovalov N.A.,Belgorod State Technological University | Hannachi A.,El Manar Preparatory Institute for Engineering Studies
Korean Journal of Chemical Engineering | Year: 2010

The removal of Ni(II) from aqueous solution by different adsorbents was investigated. Calcined phosphate, red mud, and clarified sludge (a steel industry waste material) were used for the adsorption studies. The influence of pH, contact time, initial metal concentration, adsorbent nature and concentration on the selectivity and sensitivity of the removal process was investigated. The adsorption process was found to follow a first-order rate mechanism and rate constant was evaluated at 30 °C. Langmuir and Freundlich adsorption isotherms fit well in the experimental data and their constants were evaluated. The thermodynamic equilibrium constant and the Gibbs free energy were calculated for each system. The adsorption capacity (qmax) calculated from Langmuir isotherm and the values of Gibbs free energy obtained showed that calcined phosphate has a higher capacity and affinity for the removal of Ni(II) compared to the other adsorbents used in the study. © 2010 Korean Institute of Chemical Engineers, Seoul, Korea.

Shemanin V.G.,Kuban State University | Atkarskaya A.B.,Belgorod State Technological University
Technical Physics | Year: 2014

The influence of the aging period (duration) and the aging-related rheological characteristics of film-forming solutions (sols) on the refractive index and thickness of coatings, light reflection and light transmission coefficients, and optical losses in glass substrate-nanodimensional oxide (CuO-TiO2) composites is considered. It has been shown that the increase in the CuO concentration in the coating and the extension of the sol aging period favor crystallization and change the form of inclusions in the coating from pseudospherical to dendritic with a different degree of branching. The refractive index of the film and its related coefficient of mirror reflection of the composite are functions of the density of packing sol disperse-phase particles into a nanodimensional layer. The packing density of dendritic particles drops decreases with the degree of their branching and transverse size of fragments. In every case, an optimal sol aging period should be found to obtain glass composites with nanodimensional coatings offering desired optical properties. © 2014, Pleiades Publishing, Ltd.

Vasilenko T..,Belgorod State Technological University
Solid State Phenomena | Year: 2016

The paper shows the possibility of production of the expanded clay aggregate with the use of electric steel melting slag up to 3.0 % produced by JSC “Oskol Electric Steel Works”. It was determined that at the temperature of 1170 °C the expanded clay aggregate with high strength properties and a high coefficient of swelling is formed. The preliminary thermal preparation of the samples with slag addition was at 500 ºC. An opportunity to use iron-containing waste was revealed which lowers the temperature of the expanded clay aggregate burning. By means of the X-ray phase analysis the mineral mullite Al5SiO9.5 was found in the resulted samples of the expanded clay aggregate with an optimal addition of slag which reinforces a glass phase of granules and strengthens it. The results can be used for production of the expanded clay gravel with the use of industrial wastes. The technological scheme of the expanded clay production with the use of waste can be carried out without making any additional capital investments. © 2016 Trans Tech Publications, Switzerland.

Doroganov V.A.,Belgorod State Technological University
Refractories and Industrial Ceramics | Year: 2012

Aspects of the modification of refractory concretes with different grades of Ludox nanosilica are discussed. It was established that the addition of nanosilica TMA to the binder in amounts no greater than 25% of the binder's weight increases the strength of medium-cement concretes and alleviates their softening. The grade of nanosilica that is optimum for super-low-cement concretes is AS-40. © 2012 Springer Science+Business Media, Inc.

Il'ina T.N.,Belgorod State Technological University
Chemical and Petroleum Engineering | Year: 2013

Methods are considered for sintering fine materials, and a requirement is demonstrated for classifying fine materials in order to select a sintering method, binding additive, and equipment provisions. A material fineness index is proposed, taking account of material natural features and its surface energy, depending on the powder material preparation method. Powder materials are classified as low-fineness, medium-fineness, and very-fine. Recommendations are developed for organizing sintering in fineness systems of different stability. It is demonstrated that low-fineness heavy materials are pelletized with moisture-containing plastifiers, which it is expedient to add in the charge mixing stage for binding material free moisture in order to provide pellet plastic deformation during molding. For medium-fineness materials, it is possible to obtain pellets by extrusion and nodulizing with a moisture content of 18-23%. For very-fine materials, a preliminary charge compaction stage is necessary in order to remove a gas phase and form micropellets for subsequent growth and compaction. © 2013 Springer Science+Business Media New York.

Rubanov V.G.,Belgorod State Technological University
International Journal of Soft Computing | Year: 2015

By analyzing of temperature control system of unit for sapphire crystal growing, applied in production are revealed significant disadvantages, affecting both the quality of the process and energy consumption in manufacturing. Here is proposed a structure of microprocessor automatic control system and software of its functioning, eliminating revealed lacks, associated with phase imbalance of supply voltage and appearance of higher harmonics, negatively affecting industrial voltage supply quality. Providing technological modes of heating installation carried out using the power supply circuit of two groups of field-effect transistors, operating in dynamic mode with minimum drain-source resistance at the time of switching which required the development of control system on a monostable multivibrator. To implement regulating laws are used modern microcontroller tools and technological programming languages, recommended by the IEC. Usage of visualization tools enables graphical representation of current information, operational control and corrective parameters as well as notification of emergency modes. Also, here is shown efficiency of system operation using PID control law with width modulation and proposed specific technological solutions. © Medwell Journals, 2015.

Il'ina T.N.,Belgorod State Technological University
Chemical and Petroleum Engineering | Year: 2010

Methods are considered for protecting the surface of polydispersed materials from dust carry-over with open stockpiling methods, shipment and storage. Requirements are developed for the physicochemical parameters of solution of technical-grade binders for agglomeration of the surface layer of powder materials with the aim of forming a protective coating. Compositions are proposed that contain technical-grade lignosulfonate (TLS), latexes for securing the dusty surface of phosphogypsum and ferrous titanium slurry, stored in open territory of a cement plant. In order to treat the open surface of bituminous coal, shipped by river transport, compositions are developed containing a sodium salt of carboxymethyl cellulose and TLS, and the optimum consumption of binder material aqueous solutions is established. Compositions containing TLS and polyacrylamide (PAA), and also PAA and phenolformaldehyde resins, are developed for reducing dust carry-over from the open surfaces of an iron ore enrichment combine waste dump. © 2010 Springer Science+Business Media, Inc.

Bel'Maz N.S.,Belgorod State Technological University
Refractories and Industrial Ceramics | Year: 2010

Information is provided for preparing high-alumina ceramic concretes based on a combined silicate-phosphate binder. Features are revealed for structure formation of the ceramic concrete developed during hardening, drying and firing; probable chemical reactions that occur are indicated. © 2010 Springer Science+Business Media, Inc.

Cherevatova A.V.,Belgorod State Technological University
Refractories and Industrial Ceramics | Year: 2010

The combined interaction of factors is presented determining the principles of creating nanostructured binders based on highly concentrated ceramic binder systems (HCBS). Presence in HCBS of particles at a nano-level, and also intentional optimization of the spatial structure of this system has a comprehensive favorable effect on structure, rheotechnological properties of HCBS, and the technical and operating properties of materials prepared based upon them. © 2010 Springer Science+Business Media, Inc.

Trepalina Yu.N.,Belgorod State Technological University
Refractories and Industrial Ceramics | Year: 2010

The process of manufacturing protective coatings by means of deposition of aqueous suspensions is distinguished by the simplicity of the technological process and the low temperature at which it is realized. Phosphate-containing binders and concretes based on these types of binders increase the resistance of the particular material to corrosive media. Through their use it is possible to increase the service life of refractories. © 2010 Springer Science+Business Media, Inc.

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