Oxidation of pokrovskoe coal in laboratory and natural conditions. 2. Laboratory coking of experimental batch

Abstract

When Pokrovskoe coal oxidized in laboratory conditions (at 140°C) and in natural conditions (between−1 and +22°C) is used in coal batch, the packing density is increased, its plastic–viscous properties are impaired, the expansion pressure is reduced, the content of carbon and hydrogen is reduced, the oxygen content increases, the yield of coke, tar, and benzene falls, and the yield of carbon dioxide, pyrogenetic water, and gas increases. The oxidation is greatest for coal smaller than 0.5 mm. Accordingly, the overall oxidation of the coal is determined not only by the duration and conditions of storage but also by its content of dusty classes. Oxidation reduces the expansion pressure of the coal batch, with loss of mechanical strength of the coke produced. The coke produced from coal batch containing oxidized coal has a higher proportion of isotropic coal, which increases its reactivity and impairs its strength and postreactive strength.