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Victor I. Alexandrov
Victor I. Alexandrov
Ph.D., Dr.Sci., Professor
Saint Petersburg Mining University
, Ph.D., Dr.Sci., Professor
Saint Petersburg Mining University
Saint Petersburg
Russia

Articles

Geotechnical Engineering and Engineering Geology
  • Date submitted
    2021-12-15
  • Date accepted
    2022-09-12
  • Online publication date
    2023-03-16
  • Date published
    2023-08-28

Substantiation and selection of the design parameters of the hydroficated equipment complex for obtaining backfill mixtures from current enrichment tailings

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The issue of the influence of the concentration of the solid phase on the reduction of energy costs and specific energy consumption during pulp transportation is considered. The procedure for preparing slurry from the current enrichment tailings is shown. A scheme is given and the operation of a hydroficated unit for thickening and hydraulic transport of backfill mixtures is described. A diagram of the movement of solid particles in one of the units of the complex – a lamellar thickener is shown. The summary table shows the main design parameters and characteristics of the lamellar thickener. A general view of the laboratory setup used for experimental studies with slurry at various concentrations is given. An example of calculating productivity, density and specific load is presented. The dependence of the shear stress on the velocity gradient was determined for various pulp concentrations. Experimental studies of the process of thickening the production of slurry from the current enrichment tailings have been carried out. It was found that the geometric dimensions of the thickener depend on the concentration of the solid phase in the transported mixture. It is concluded that the flow rate of the slurry and the head loss are functions of the rheological characteristics of the viscoplastic slurry and can be calculated from the derived calculated dependencies.

How to cite: Alexandrov V.I., Vatlina A.M., Makharatkin P.N. Substantiation and selection of the design parameters of the hydroficated equipment complex for obtaining backfill mixtures from current enrichment tailings // Journal of Mining Institute. 2023. Vol. 262. p. 541-551. DOI: 10.31897/PMI.2022.68
Electromechanics and mechanical engineering
  • Date submitted
    2019-05-24
  • Date accepted
    2019-07-15
  • Date published
    2019-10-27

Effective Power and Speed of Mining Dump Trucks in Fuel Economy Mode

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Existing methods for determining the effective power, based on the calculation of the average indicator operation of the engine during the piston stroke, do not take into account the change in thermodynamic parameters and the polytropic operation of the engine, the value of which depends on the polytropic efficiency of the duty cycle. This is the reason that the calculation of the effective power leads to some error – the margin of the engine features. The identification of this stock allows us to review the entire line of dump trucks in the direction of increasing their pass- port effective capacity, which will lead to a reduction in capital purchase costs due to the choice of a previously un- derestimated and cheaper option, as well as a reduction in current operating costs due to a decrease in the specific fuel consumption rate. Taking into account the stochastic nature of the transport process and assessing the influence of all external and internal factors when calculating the rational mode of operation of a mining truck can further reduce specific fuel consumption by choosing the rational speed of its movement in loaded and empty directions.

How to cite: Alexandrov V.I., Vasileva M.A., Koptev V.Y. Effective Power and Speed of Mining Dump Trucks in Fuel Economy Mode // Journal of Mining Institute. 2019. Vol. 239. p. 556. DOI: 10.31897/PMI.2019.5.556
Mining
  • Date submitted
    2018-05-07
  • Date accepted
    2018-07-06
  • Date published
    2018-10-25

HYDRAULIC TRANSPORTATION OF THICKENED TAILINGS OF IRON ORE PROCESSING AT KACHKANARSKY GOK BASED ON RESULTS OF LABORATORY AND PILOT TESTS OF HYDROTRANSPORT SYSTEM

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The object of study is the system of hydrotransport of iron ore processing tailings at JSC «EVRAZ Kachkanarsky GOK». The aim of the work was to determine the parameters of the hydraulic transport of tailings of the iron ore enrichment at weight concentrations of the solid phase from 30 to 70 % and to develop recommendations for the industrial operation of hydraulic transport systems of highly concentrated slurries of the Tailing Facilities of the Kachkanarsky GOK. Laboratory studies of the parameters of hydrotransport of thickened tail pulps were carried out with the development of a calculation method; pilot tests of the hydrotransport system under the conditions of the Tailing Facilities of the Kachkanarsky GOK. It has been established that using polyurethane coatings on the inner surface of the slurry lines significantly (1.75 times) decrease the specific pressure loss on the hydrotransport of thickened fluids. This allows to significantly increase the range of transportation for placing tailings in the distant parts of the storage zone. The introduction of research results is in the project of reconstruction and development of the tailing facility of the TF of the Kachkanarsky GOK for the period 2018-2020. It is proposed to use the results of work in the project of reconstruction of the hydraulic transport system at the TF of the Kachkanarsky GOK by switching to the hydraulic transport of slurries thickened to weight concentrations of 35-40 % in the slurry pipes with an internal polyurethane coating, which will ensure energy saving in the hydraulic transport process.

How to cite: Aleksandrov V.I., Vasileva M.A. HYDRAULIC TRANSPORTATION OF THICKENED TAILINGS OF IRON ORE PROCESSING AT KACHKANARSKY GOK BASED ON RESULTS OF LABORATORY AND PILOT TESTS OF HYDROTRANSPORT SYSTEM // Journal of Mining Institute. 2018. Vol. 233. p. 471. DOI: 10.31897/PMI.2018.5.471
Electromechanics and mechanical engineering
  • Date submitted
    2017-01-16
  • Date accepted
    2017-03-11
  • Date published
    2017-06-25

Energy efficiency of hydraulic transportation of iron ore processing tailings at Kachkanarsky MPP

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The article presents analytical calculations of specific pressure losses during hydraulic transportation of slurry tailings from iron ore beneficiation processes at the Kachkanarsky MPP during the storage of processing tailings in the tailings pond. The calculations were performed based on the results of experimental studies of dependence of specific pressure losses on roughness of inner surface of pipelines lined with polyurethane coating. In the process of experimental determination of pipeline polyurethane coatings roughness, it was established that the physical roughness of the coatings is more than four times less than the roughness of steel pipelines, which leads to a decrease in the coefficients of hydraulic resistances included in the design formula for the specific pressure losses - the Darcy-Weisbach formula. The coefficients of relative and equivalent roughnesses for pipelines with and without coating have been calculated. Comparative calculations have shown that the use of polyurethane coatings of hydrotransport pipelines contributes to a decrease in the specific energy during hydraulic transportation of processing tailings of iron ore from Kachkanarsky MPP in 1.5 times. To assess the nature and intensity of changes in the physical roughness of test pipes with polyurethane coating, experiments were performed on the roughness on a laboratory hydraulic bench. The prepared slurry of the iron ore tailings of Kachkanarsky MPP was pumped through a looped pipeline, in the linear part of which three test coated pipes were sequentially installed. Experiments showed that the roughness after running 484 hours on all the samples of the pipelines varies insignificantly. Roughness values are in the range from 0.814 to 0.862 μm. As a result of the processing of experimental data by mathematical statistics, an empirical formula is obtained for calculating the surface roughness of the polyurethane coating surface, depending on the time of operation of pipeline transporting the slurry of the iron ore processing tailings.

How to cite: Aleksandrov V.I., Timukhin S.A., Makharatkin P.N. Energy efficiency of hydraulic transportation of iron ore processing tailings at Kachkanarsky MPP // Journal of Mining Institute. 2017. Vol. 225. p. 330. DOI: 10.18454/PMI.2017.3.330
Electromechanics and mechanical engineering
  • Date submitted
    2015-08-25
  • Date accepted
    2015-10-01
  • Date published
    2016-02-01

Vibrodiagnostics of the technical state slurry pumps

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Analysis of the work hydrotransport systems in processing plants shows that the efficiency of this type transport does not match its technical capabilities: the high laboriousness involved in the operation of the equipment, high hydroabrasive wear of slurry pumps and pipelines, low working life pumps, high metal consumption and energy. The main reason for the lack of effectiveness of hydraulic transport is hydroabrasive wear impellers of slurry pumps, causing rising levels of vibra-tion pumps, reducing the pressure characteristics, general technical state of hydrotransport system and as a result - low pumps life, not exceeding 500 hours of continuous operation. In paper, it is shown that as a criterion of period normal operation slurry pump can be used coefficient of techni-cal state, the value of which is proportional to the relative head, degree of hydroabrasive wear of the impeller and time of continuous operating. The coefficient technical state of slurry pump can be represented as a function of current flow rate and the RMS value of vibration velocity. The re-sults of theoretical and experimental studies used to develop algorithms and techniques express-diagnosis and monitoring of slurry pumps in hydrotransport system, data which indicate the need for routine maintenance of pumping equipment.

How to cite: Aleksandrov V.I., Sobota I. Vibrodiagnostics of the technical state slurry pumps // Journal of Mining Institute. 2016. Vol. 218. p. 242.
Mining
  • Date submitted
    2014-12-20
  • Date accepted
    2015-02-13
  • Date published
    2015-06-01

Design procedure of pressure losses for hydrotransport of the high concetration pulps

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In the paper it is shown that application of standard design methods for hydrotransport used for slurry with small concentration of a solid phase and for hydrotransport of high concentration slurry leads to considerable divergences between practical values of pressure losses which are received as a result of calculation. A major factor, which defines errors of calculation of hydrotransport of slurry with high concentration of a solid phase by means of standard techniques, is that these techniques do not consider rheological characteristics and parameters substantially influencing the amount of spe-cific pressure losses. The offered model of a pulp movement and technique developed on the basis of this model allow to define hydrotransport parameters with a margin error no more than 0,1.

How to cite: Aleksandrov V.I., Vlasak P. Design procedure of pressure losses for hydrotransport of the high concetration pulps // Journal of Mining Institute. 2015. Vol. 216. p. 38.
Mining
  • Date submitted
    2014-09-25
  • Date accepted
    2014-11-20
  • Date published
    2015-03-01

Power consumption of hydraulic transport of products of mineral processing

Article preview

The problem of decreasing power consumption by hydraulic transport systems remains to be the most important among other problems in the mining industry. The increase of solid material concentration in the volume of transported pulp leads to reduction of general pulp flow rate on the one hand and to increase of pressure losses and, accordingly, of a necessary head for over-coming hydraulic resistance on the other hand. The problem of minimizing power consumption in slurry transport is of particular relevance now when there is a tendency for hydraulic transport of highly-concentrated pulps and pastes to be widely used in the mining industry.  The article shows that the energy intensity to a certain extent depends on the performance of hydraulic transport of solid materials, and this dependence is of extreme nature. At low concentra-tions of solid particles large volumes of recycled water have to be pumped to provide the neces-sary performance, which leads to consumption of large amounts of electricity. The increase оf concentration results in the decrease in the volumetric flow rate of the pulp and, accordingly, spe-cific power consumption of the process. The process of reducing energy consumption takes place up to a certain critical value of the concentration above which a further increase in the concentra-tion raises power consumption.

How to cite: Aleksandrov V.I., Sobota I. Power consumption of hydraulic transport of products of mineral processing // Journal of Mining Institute. 2015. Vol. 213. p. 9.
Development of oil and gas deposits
  • Date submitted
    2010-07-16
  • Date accepted
    2010-09-11
  • Date published
    2011-01-01

Parameters of high viscosity oils transportation in the form of emulsion research in order to its optimization

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The article deals with the physical model of high viscosity oil-in-water emulsion flow, which concern both structural and plastic properties of viscoplastic liquids. On the basis of theoretical study, which was proved with experimental data, computation algorithm of high viscosity oil in emulsion state pipeline transportation was developed.

How to cite: Aleksandrov V.I., Khrabrov A.P. Parameters of high viscosity oils transportation in the form of emulsion research in order to its optimization // Journal of Mining Institute. 2011. Vol. 189. p. 175-178.
Technological machinery and equipment of mining and oil & gas industries
  • Date submitted
    2007-11-22
  • Date accepted
    2008-01-30
  • Date published
    2008-05-01

Calculation of parameters of pipe-water transportation of hydraulic mixtures with high concentrations of solid phase

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In this paper the results theoretical estimation of value yield shear stress at the hydraulic transportation of poly-metallic ore tailings are presented. In basis of a method separate positions of the similarity theory are used thus in consideration the combination of numbers of Reynolds, Froud and Euler which set have led to the new dimensionless criterion describing the yield shear stress is accepted.

How to cite: Aleksandrov V.I., Pirozhenko V.P., Gurkin P.B. Calculation of parameters of pipe-water transportation of hydraulic mixtures with high concentrations of solid phase // Journal of Mining Institute. 2008. Vol. 178. p. 27-30.
Mining engineering technologies. Diagnostics and control of technical systems and their elements. New technologies
  • Date submitted
    2003-07-08
  • Date accepted
    2003-08-05
  • Date published
    2004-02-01

Modeling and designing system of hydraulic lift of mined rock at submarine development of mineral raw materials

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One of complicated aspects in designing and developing of deep-water complexes is estabfishing economical and safe systems of elevating carrying out transportation of valuable fossil from underwater face up to aqueous surface to transport vessel. Very perspective for elevating of rock mass are submarine modules with submersible camera, connected with transport piping, along which the transportation of mineral raw in the form of mixtures is carried out. To practically unknown questions, directly associated with the possibility of designing and building up of submersible cameras, the calculation of the parameters of the vertical elevating of rock mass with higher depths can be applied.

How to cite: Aleksandrov V.I., Sobota E. Modeling and designing system of hydraulic lift of mined rock at submarine development of mineral raw materials // Journal of Mining Institute. 2004. Vol. 157. p. 140-143.
Without section
  • Date submitted
    2000-07-20
  • Date accepted
    2000-08-10
  • Date published
    2001-02-01

Development of technology for preparation of water-coal suspensions for combustion in furnaces of steam boilers and combustion chambers of gas-turbine plants

Article preview

Coal-water slurry (CWS), which is a hydro mixture of ground coal and water, can be regarded as a technological type of power-plant fuels. Provided that necessary requirements are met during CWS preparation, CWS can make a valuable alternative to traditional types of liquid and gaseous power-plant fuels, such as natural gas, mineral and boiler oil, for burning in boiler furnaces and combustion chambers of gas-turbine units. To secure power plant conversion using CWS, it is necessary to consider a number of tasks related to the development of requirements for the preparation of CWS from coals of different categories, hydraulic long-distance transportation of CWS and design of CWS injection devices to ensure combustion of suspension jet in a short flame. The general problem of using CWS as a fuel for power plants is considered and general research trends in this area are shown.

How to cite: Aleksandrov V.I. Development of technology for preparation of water-coal suspensions for combustion in furnaces of steam boilers and combustion chambers of gas-turbine plants // Journal of Mining Institute. 2001. Vol. 147. p. 161-163.
Mining
  • Date submitted
    1994-09-19
  • Date accepted
    1994-11-04
  • Date published
    1995-03-01

Распределение концентрации твердой фазы при течении вязкопластичных гидросмесей

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Течение вязкопластичных гидросмесей по трубопрово­дам сопровождается перераспределением концентрации твердой фазы по сечению потока. При структурном режи­ме течения и линейном характере распределения твердой фазы концентрация в ядре потока и в кольцевом про­странстве составляет соответственно 1,6 и 0,8 от ис­ходного содержания твердого.

How to cite: Aleksandrov V.I., Dokukin V.P., Nikolaev A.K. // Journal of Mining Institute. 1995. Vol. 142. p. 150.
Without section
  • Date submitted
    1994-08-23
  • Date accepted
    1994-10-27
  • Date published
    1995-02-01

Расчет систем гидротранспорта с использованием ЭВМ

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В процессе проектирования систем гидротранспорта приходится выполнять большой объем расчетов, обусловленных необходимостью анализа различных ва­риантов компоновки схемы, определения параметров потока смеси, экономичес­ких показателей и др. Этот объем работы может быть достаточно быстро вы­полнен с помощью ЗВМ. Однако это требует разработки ряда программ, из ко­торых должен быть сформирован пакет программ, позволяющий решать различные задачи при проектировании, эксплуатации и реконструкции гндротранспортных комплексов ...

How to cite: Aleksandrov V.I., Dokukin V.P., Kuleshov A.A. // Journal of Mining Institute. 1995. Vol. 141. p. 37.
Without section
  • Date submitted
    1994-08-18
  • Date accepted
    1994-10-11
  • Date published
    1995-02-01

Модель течения гидросмеси мягкой серпентинитовой руды

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Существующие запасы окисленных никелевых руд Республики Куба состоят из лимонитовой (железистой) и серпентинитовой (магнезиальной) фракций, при этом серпентиниты составляет примерно одну треть запасов. Технологический процесс переработки серпентинитовых руд на предприятии имени Педро Сото Альба и разница геодезических высот между заводом и месторождением делают более выгодным применение самотечного гидротранспорта обогащенного минера­ла до металлургического завода как наиболее экологически чистого вида транспорта продуктов обогащения и к тому же не требующего снабжения энер­гией. Однако состав твердой фазы пульпы создает определенные трудности для ее движения ...

How to cite: Suares M., Aleksandrov V.I., Dokukin V.P., Nikolaev A.K. // Journal of Mining Institute. 1995. Vol. 141. p. 50.
Without section
  • Date submitted
    1994-08-05
  • Date accepted
    1994-10-27
  • Date published
    1995-02-01

Теоретический анализ процесса осаждения в сгустителях с наклонными пластинами

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В технологических процессах гидравлического транспортирования насып­ных материалов применяются различные типы сгустителей исходной двухфазной смеси. В последние года получили распространение, особенно за рубежом, сгустители пластинчатого типа, так называемые "Lamell". Принципиальным отличием этих сгустителей от традиционных, например типа " Dora",  является деление исходного потока сгущаемой гидросмеси на ряд ламинарных течений при помощи тонких пластин, устанавливаемых наклонно в корпусе сгустителя, на некотором малом, обычно 30-50 мм, расстоянии одна от другой.  

How to cite: Aleksandrov V.I., Nagaev R.F. // Journal of Mining Institute. 1995. Vol. 141. p. 58.
Without section
  • Date submitted
    1986-07-02
  • Date accepted
    1986-09-17
  • Date published
    1987-01-01

Рабочий ресурс перистальтического насоса и показатели его надежности

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Перистальтический насос по принципу действия относится к насосам вытеснения (объемным). Основным элементом, определяющим в конечном ито­ге надежность насоса, является рабочий шланг, воспринимающий в процессе работы нагрузки, определяемые деформацией стенок шланга и внутренним давлением ...

How to cite: Aleksandrov V.I. // Journal of Mining Institute. 1987. Vol. 110. p. 79.