Current Aspects of Prevention of Coal Freezing by Means of Inorganic and Organic Reagents

Ekaterina Shmeltser,Vitalij Lyalyuk,Maryna Kormer,S Hushko,V Solovieva,A Shaikan,I Khvostina,S Semerikov

doi:10.1051/shsconf/202110006003

Ekaterina Shmeltser, Vitalij Lyalyuk + Show 6 more

Open Access

https://doi.org/10.1051/shsconf/202110006003

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Abstract

In the cold season, irregular coal supplies to coke plants are aggravated by the need to heat the coal cars. Thawing of rail cars in garages (enclosures) is the least efficient and most expensive approach. Treatment of the coal concentrates with chemical additives reliably prevents freezing in winter during transit from suppliers to consumers. With a view to finding new reagents for preventing the freezing of coal in winter, the lime, the acetates and chlorides of alkaline-earth and alkaline metals are studied. Attention focuses on their physicochemical characteristics, methods of preparation and of introduction in coal concentrate, and their influence on freezing. The results of studies have shown that the use of organosilicon is more effective use of acetates and chlorides of metals. The high activity of organosilicon substances is explained by their elemental composition and structure of molecules.

Highlights

In the cold season, irregular coal supplies to coke plants are aggravated by the need to heat the coal cars
Among the problems encountered by coke plants in the cold season is freezing of the coal concentrates on transportation, which hinders their discharge from the rail cars
In laboratory research on the freezing of coal concentrate samples from the coal preparation shop in the coke plant at PAO ArcelorMittal Kryvyi Rig, we using the lime, the acetates and季 chlorides of alkaline-earth and alkaline metals are tested as reagents to prevent freezing of coals

Summary

INRODUCTION

Among the problems encountered by coke plants in the cold season is freezing of the coal concentrates on transportation, which hinders their discharge from the rail cars. The individual coal particles freeze together and bond with the floor and walls of the car The freezing of coal is a complex thermophysical process accompanied by the migration of moisture and temperature variation It depends primarily on the thermal conductivity and specific heat of the coal, the duration of the low ambient temperatures, the moisture content of the coal, its metamorphic stage, the composition of mineral impurities, the granulometric composition, and the hydrophilic properties of the surface. If the moisture content of the coal is at or below the safe level, freezing of the particles will not occur, and the coal will remain friable at negative temperatures [3]. The binding strength on freezing depends on the coal’s moisture content and the ambient temperature and on the material from which the car is made. The force required to separate a coal layer frozen to walls of different materials at –15°C is as follows (kN/m2), according to [3]:

ANALYSIS OF PREVIOUS STUDIES

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