National Mineral Resource University

Saint Petersburg, Russia

National Mineral Resource University

Saint Petersburg, Russia
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Soots K.,Estonian University of Life Sciences | Maksarov V.,National Mineral Resource University | Olt J.,Estonian University of Life Sciences
Agronomy Research | Year: 2014

The article has indicated the principle scheme for post-harvest processing of cultural berries according to the possibilities of the developed new berry sorter. The article tackles the constructive features of the post-harvest treatment of berries as well as of the belt sorter that functions on the principle of successive sorting method. The aim of study was to evaluate the technological features of the berry sorter, based on test results, and to determine problematic assemblies in the construction of the device. Continously adjustable gaps between pulleys as new technological solution for belt sorter was tested and initial results are presented in this article with future improvements. Initial results in this article show that novel continuously adjustable berry sorter functioned satisfactorily. The properties of berry fractions produced with novel berry sorter were possible to change with short time. It was also determined that settings to ensure highest berry fraction purity need to be clarify. © 2014, Eesti Pollumajandusulikool. All rights reserved.

Sizyakov V.M.,National Mineral Resource University | Tikhonova E.V.,National Mineral Resource University | Cherkasova M.V.,National Mineral Resource University
Non-ferrous Metals | Year: 2013

The Bayer process aluminate solutions are characterized by accumulation of organic compounds, which worsen the manufacturing parameters and quality of produced alumina. Sorption methods of purification are the easiest and the most efficient. Sorption characteristics of activated carbon, magnesium oxide, hydrated carboaluminates and sulfoaluminates of magnesium are considered, concerning organic chemistry of aluminate solutions. Extra-sorbtion mechanism was defined during the processing of aluminate solutions by activated magnesia. There was also defined the high sorption potential of magnesium hydro aluminate phases. Advantages of such compounds consist in the following factors: - likeness of sorbent composition to the system; - absence of influence on solution's technological structure; - low power expenses for reagent regeneration (at the temperatures of 250-400 °C). The foregoing characteristics of synthesized sorbents can be the basis for development of technology of aluminate solutions purification from organic compounds by active sorbents (hydrated carboaluminates and sulfoaluminates of magnesium).

Argimbaev K.R.,National Mineral Resource University | Kholodjakov H.A.,National Mineral Resource University
Research Journal of Applied Sciences | Year: 2016

Results of numerical models for rock mass stress-strain behavior presented in the paper allow to reduce the risk of technogenic accidents during mineral deposits open-pit mining with taking into account the construction sequence, the pit depth and the degree of water cut. The methods in which the continuous medium is approximated by a discrete model at the stage of the numerical model development are referred to the computational methods of rock mass stress-strain behavior forecasting. In this case where further idealization when formulating and solving equations is not applied, integration is replaced by finite summation and partial differential equations are replaced by systems of linear algebraic or ordinary differential equations. In addition, the continuous medium is replaced by a discrete model having a finite number of degrees of freedom. © Medwell Journals, 2016.

Maksarov V.,National Mineral Resource University | Khalimonenko A.,National Mineral Resource University | Timofeev D.,National Mineral Resource University
Agronomy Research | Year: 2014

The article deals with the problems of improving quality of parts machined on lathe type machine tools. Improvements are suggested by predicting the operability (tool life parameter) of cutting tools equipped with replaceable ceramic inserts. It is proposed to forecast the operability of ceramic tools on the ground of relation between operational characteristics of the ceramic and microstructural parameters of the ceramic material. Microstructural parameters of ceramic inserts are determined by non-destructive testing method, evaluating them by estimating the specific electric resistance of the material. As a result of research, a relation has been detected between operability of the inserts and the specific electric resistance of the insert material. Obtained results permit one to determine the stability range borders for lathing blanks with tools equipped by ceramic cutting inserts and to predict flawless work.

Ermolin E.,National Mineral Resource University | Savichev A.,National Mineral Resource University | Ingerov I.,Advanced Geophysical Operations and Services Inc. AGCOS
Proceedings of the Symposium on the Application of Geophyics to Engineering and Environmental Problems, SAGEEP | Year: 2016

The integration of geochemical and geophysical methods was applied to epithermal gold-quartz veins exploration in Chukotka tundra (North-East Russia). The feature of the investigated area is that the gold-quartz veins are blind and are located 50-120 m below the surface under the layers of low-resistive andesitic tuff. The Audiomagnetotelluric Soundings (AMT) and Magnetovariational Profiling (MVP) methods have been applied. Ability to carry out work, productivity and the accuracy of measurements were achieved via application of precision field tripods for magnetic sensors installation. The analysis of AMT-MVP data has shown its high sensitivity to geoelectrical cross-section changes in wide depth interval. The position of known quarts-gold vein zone has been determined as a high resistivity zones. Consequently, based on the AMT and MVP data interpretation results, prognosis of new dikes has been done in the late 2013. All prognoses were confirmed by 2014 drilling program and new discoveries are estimated at around 50 ton of gold. Therefore, AMT-MVP could be considered as a very useful technique for these geological conditions.

Madissoo M.,Estonian University of Life Sciences | Rossner A.,Estonian University of Life Sciences | Olt J.,Estonian University of Life Sciences | Maksarov V.,National Mineral Resource University
Medziagotyra | Year: 2015

The paper focuses on testing the utility effect of a cutting tool holder with inserted alternate bars of different material structure in its construction. The different bars are made from rolled steel and have an anisotropic structure which also has different mechanical properties. This construction is considered as a method to improve the cutting stability of the cutting tool and helps to reduce the oscillations in the finishing turning. A method for the construction of the damped instrument holder is proposed. A series of comparative experiments was carried out with both the standard and the modified tool holder. In the cutting tests only the feed rate was changed, cutting speed and the depth of cud remained always the same. All tests were repeated three times. After each cutting the surface roughness of all the treated surfaces were measured and compared. Surface roughness measurements revealed that the average surface roughness improved 9 % with the use of the modified tool holder. Only in one case, at the feed rate of 0.1 mm r-1 a poorer surface roughness with the modified holder was achieved. © 2015, Kauno Technologijos Universitetas. All rights reserved.

Maksarov V.,National Mineral Resource University
Agronomy Research | Year: 2015

The article introduces new results on designing multilayer cutting tool holder. Experimental study of metal turning process workpieces shows efficient dynamic damping of oscillations. The coefficient of oscillations absorption and damping is increased due to large dissipative force of the material holder oriented in different deformation directions of holder material. © 2015 Eesti Pollumajandusulikool. All rights reserved.

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