The information on distribution of microelements (ME) in organic and mineral substances of coal and other solid mineral fuels helps understanding general geochemical mechanisms of ME accumulation in the caustobioliths and selecting technologies for their integrated use at the minimized environmental impact. Currently there are no methods for the quantitative division of coal and other solid combustible minerals into organic and mineral substances with the quantitative recovery of ME contained in initial specimen. In this regards, the routine method is separation to different density fractions, and a fraction having less density and, accordingly, smaller ash content has higher content of organic substances. The quantitative estimation of ME distribution (belonging to an organic or a mineral substance) is based on two criteria: reduced content of an i-th element in a g-th fraction (Yig) and recovery of an i-th element in a g-th fraction (Uig) calculated from the relations: where Сiо and Сig —contents of the i-th element in initial coal and in the g-th fraction; Ɣg—yield of the g-th fraction.

In spotlight of the article is the method of directional solidification applied to manufacturing Ni-resist cast-iron part blanks of the type of rotary bodies for critical parts of machines operating in mining, petroleum production and refining. Inasmuch as these parts run in the extreme environment, the material is imposed with a series of special requirements: antimagnetic properties, growth-resistance under negative temperatures (to -60˚С), corrosion stability, etc. These requirements are satisfied by austenitic nickel–copper cast iron ChN15D7 with flaky graphite known under the name Ni-resist. The scope of the studies encompasses conditions of austenitic iron casting with the specific properties and technological framework for casting of hollow cylindrical part blanks with direct solidification without mold core. The presence of ferromagnetic phase in the cast iron structure is estimated, and growth-resistance of cast iron under negative temperatures is tested. The influence of structural and process parameters on casting and chilling stability is analyzed. The process stability limits are defined for manufacturing hollow small-diameter part blanks (D ≈ 40 mm) by direct solidification. Manufacturability of such hollow cylinders in continuous cyclic molding mode is determined. The article presents formulas to calculate thickness casting mold walls and to analyze graphitization constant which is an approximated characteristic of iron cast susceptibility to chilling as applied to the test cast iron grade. The conditions of guaranteed manufacture of mold part blanks without carbide inclusions are determined for all tested melting stock. The developed engineering solutions and process designs ensure production of part blanks with austenitic steel matrix without chilling as-cast irrespective of casting method and melting stock. Based on the application of the research findings on a proving ground at the Institute of Technology of Metals, National Academy of Science of Belarus, production of pilot batches of Ni-resist cats iron part blanks with the preset special properties (antimagnetic characteristics, growth-resistance under negative temperatures to - 60˚С) for the petroleum recovering and refining machines has been organized.


Austenitic nickel–copper cast iron; Ni-resist cast iron, mining, petroleum recovering and petroleum refining machine building parts, properties and structure, antimagnetic properties, growth-resistance.

Issue number: 2
Year: 2018
UDK: 621.74.047
DOI: 10.25018/0236-1493-2018-2-0-156-167
Authors: Bevza V. F., Grusha V. P., Krasnyy V. A.

About authors: Bevza V.F.1, Candidate of Technical Sciences, Senior Researcher, Head of Laboratory, Grusha V.P. (1), Candidate of Technical Sciences, Senior Researcher, Krasnyy V.A., Candidate of Technical Sciences, Assistant Professor, e-mail:, Saint Petersburg Mining University, 199106, Saint-Petersburg, Russia, 1) Institute of Technology of Metals, National Academy of Sciences of Belarus (SSI «ITM NAS of Belarus»), 212030, Mogilev, Republic of Belarus, e-mail:


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