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A. V. Mikhailov
A. V. Mikhailov
National Mineral Resources University (Mining University)
National Mineral Resources University (Mining University)
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Articles

Mining
  • Date submitted
    2021-02-20
  • Date accepted
    2021-05-21
  • Date published
    2021-09-20

Analysis of the screw press mouthpiece parameters for 3D extrusion of peat pieces of tubular type

The results of theoretical and experimental studies on the creation of a screw press composite mouthpiece screw press for 3D-forming of peat pieces of a tubular type in the field for intensifying the process of field drying of material in a complex mechanized pit are presented. The main purpose of the study was to substantiate the geometric and design parameters of the screw press composite mouthpiece of the spread machine for the production of peat-agglomerated products of the tubular type. The parameters of the mouthpiece are selected based on the geometric characteristics of the peat pieces. An increase in moisture loss during drying of peat-agglomerated products is provided by forming a peat piece in the form of a thick-walled pipe made of a peat raw materials composed of low and high decomposition degrees in a ratio of 1:3. Additive production of polymer-fiber peat composites by extrusion allows to produce products with improved mechanical properties in comparison with non-reinforced raw materials. The vertical arrangement of the peat tubular piece on the drying field allows to increase the loading of the field area by 10 %, increase the convective heat supply to the piece and reduce the contact coefficient of the piece with the field by three times in comparison with the peat spreading of the pieces in the form of a horizontal tape. Based on the analysis of the shape and size of the agglomerated products, the design of a screw press composite mouthpiece consisting of two conditional molding zones of various configurations has been developed. The article presents a parametric analysis of the volumetric productivity of a screw press with a composite mouthpiece of a tubular type, the energy intensity of mechanical processing is determined, the degree of mechanical processing of peat raw materials is estimated with the optimization of the screw parameters for the production of agglomerated products of a tubular type.

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Aleksandr V. Mikhailov, Aleksandr S. Fedorov (2021) Analysis of the screw press mouthpiece parameters for 3D extrusion of peat pieces of tubular type. Journal of Mining Institute. Vol 249. p. 351-365. DOI: 10.31897/PMI.2021.3.4
Mining
  • Date submitted
    2016-10-07
  • Date published
    2016-04-01

Coal-peat compositions for co-combustion in local boilers

In article results of experiments on creation of coal and peat fuel compositions for burning in solid-fuel boilers are described. The main objective of research consisted in development of combination of coal dust and natural peat without binding additives. The role of peat consists that it increases efficiency of process of granulation, being natural binding. The method of granulation allows to utilize waste of the coal industry. Joint burning of two types of fuel – coal dust and peat reduces emission of sulfur dioxides. The cost of peat raw materials is lower, than artificial binding, applied to briquetting of coal dust. The composition of mix of coal dust and peat varied in the ratio 2:1, 1:1 and 1:2 in volume ratio at humidity of mix before extrusion of 65 %. In the course of preparatory operations of coal raw materials its crushing and sifting through sieve of 24 mesh (0,707 mm) was carried out. Procedure of hashing of samples of coal and peat was carried out before receiving homogeneous mixture. After hashing mix was located in piston press for receiving granules. Coal dust and wet peat pass semifixed extrusion on piston press with formation of cylindrical granules with a diameter of 16 mm. After extrusion of granule are dried to operational humidity of 25 %. Coal and peat fuel granules showed sufficient mechanical strength for transportation and power feed in solid-fuel boilers. Burning of coal and peat fuel granules in vitro at temperature of 800 °C does not lead to ashes agglomeration. The conducted preliminary researches showed prospects of utilization of coal waste by granulation method in mix with natural peat.

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A. V. Mikhailov (2016) Coal-peat compositions for co-combustion in local boilers. Journal of Mining Institute. Vol 220. p. 538. DOI: 10.18454/pmi.2016.4.538
Manufacturing machinery and equipment
  • Date submitted
    2016-10-17
  • Date published
    2014-03-01

Validation of transport-tractor unit passability by organogenic deposits development

This paper provides an overview of the current requirement of organogenic deposits development. Results of researches by definition of bearing value of a surface of hydrolytic lignin technogenics spoils are resulted. Preliminary results indicate that the wheel transport-tractor unit can be applied by organogenic deposits development.

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A. V. Telego, A. V. Mikhailov, A. V. Bol'shunov (2014) Validation of transport-tractor unit passability by organogenic deposits development. Journal of Mining Institute. Vol 209. p. 87.
Geology and metallogeny
  • Date submitted
    2016-11-10
  • Date published
    2013-01-01

Peat resources of the North-West federal district of the Russia and prospect of their development

This paper provides an overview of the current analysis of peat resources distribution of Northwest Federal district. The analysis of peat industry is resulted. The power effective technology of career extraction of peat raw materials and manufacture of agglomerated peat fuel for needs of the distributed power is  offered.

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A. V. Mikhailov, S. L. Ivanov, A. V. Bol'shunov, E. A. Kremcheev (2013) Peat resources of the North-West federal district of the Russia and prospect of their development. Journal of Mining Institute. Vol 200. p. 226.
Mining electromechanics and mining equipment
  • Date submitted
    2016-11-21
  • Date published
    2012-02-01

Mechanisation of extraction of peat from undrained deposit

In comparison with traditional methods of extraction using the offered equipment and developed technological schemes for industrial production of a peat will allows to avoid actions on drainage of developed fields; to reduce expenses for preparation and operation of a peat deposit; to prolong a season of mining activities, and in some cases to provide an opportunity of all-the-year-round operation of a deposit.

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A. V. Mikhailov, E. A. Kremcheev, D. O. Nagornov (2012) Mechanisation of extraction of peat from undrained deposit. Journal of Mining Institute. Vol 196. p. 256.
Mining
  • Date submitted
    2017-03-01
  • Date published
    2017-02-26

Open-pit mining of lignin waste storage

The purpose of this paper is to develop performance criteria for fleet selection in surface mining of lignin as a raw material for factory-made fuel. The East Siberian Biotechnical Plant (ESBP) proposes to close the Lignin Waste Storage (LWS) at Tulun, Irkutsk Region of Russia. The LWS is a 9.6 ha facility used for the long-term storage of hydrolysis lignin and some fly ash. The project provided whole-year open-pit mining of lignin storage with one mining ledge within 3 years. Productivity – 1500 t/day or 447 000 t/year. Excavated lignin will be stockpile on the Pellet Plant territory for later processing. Part of this closure effort would involve constructing an artificial reservoir on the place of LWS. The objectives of this project were as follows: determine equipment needs and develop optimal procedures for the lignin excavation and transportation. Lignin moving may include site preparation, excavation, transportation and road surfacing. Lignin excavation is conduct by using techniques similar to those used for open-pit mining of peat. For this project, the excavator is the most important piece of equipment required for lignin removal and handling. The mining process consist of excavating the lignin (using Kraneks ЕК-270LC) and hauling it to pellet plant via six off-road tractors&semitrailers (John Deere 7730& ISON-8520).

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A. V. Mikhailov (2017) Open-pit mining of lignin waste storage. Journal of Mining Institute. Vol 223. p. 44. DOI: 10.18454/pmi.2017.1.44