Coke and Chemistry

Abstract—For Kuznetsk Basin coal of different metamorphic stages, the fundamental difference between determining the limiting wetting angle of a coal surface by means of a hanging bubble and a sitting droplet is determined. The influence of surface preparation (briquetting of powder, plane cleavage, or surface polishing after plane cleavage) on the limiting wetting angle is investigated. The methodological features of sample preparation that affect the determination of coal wettability are identified.

Abstract—The possibility of increasing the calorific value of coke from oxidized coal is established experimentally and confirmed theoretically. This entails the use of measures already developed for the rational use of oxidized coal in coking—in particular, with a view to ensuring the required coke quality. The influence of the elemental composition, actual and apparent density, porosity, and proportions of anisotropic and isotropic structure on the calorific value of blast-furnace coke is described mathematically and graphically.

Abstract—This article addresses the production of carbon materials in an electric roasting furnace, which is a universal device covering a broad temperature range (500–1400°C). It is simple in structure, completely automatic, and characterized by high productivity and economic efficiency. Pieces of nonclinkering D, SS, T, and A coal may be heated in such furnaces. In appropriate conditions, coke may be produced from DG coal (W ^r = 8.5%, A^d = 10.4%, V^daf = 45.3%, and y = 6 mm). Such coke meets many of the requirements on reducing agents for ferroalloy production: A^d = 14.6%, V^daf = 1.6%, C_fix = 84%; reactivity \({{K}_{{{\text{C}}{{{\text{O}}}_{2}}}}}\) = 4.87 cm³/g s; porosity 54.6%; and structural strength 77.5%. The coke is tested in industrial furnaces in producing ferrosilicomanganese alloy (MnS17 alloy). It permits 44.8% increase in productivity; 6.9% decrease in power consumption; and increase in manganese extraction to 83%. High-quality roasted anthracite may be produced in the electric roasting furnace. The use of such anthracite in the electrode mass permits the production of electrodes for ferroalloy furnaces without the need for Donetsk roasted anthracite or blast-furnace coke. The production of carbon materials in an electric roasting furnace is organized in accordance with specific technological instructions, including requirements on the raw materials and the products.

Abstract—The properties of tar from the high-temperature coking of volatile-rich petroleum coke (CA, coking additive) are compared with the properties of coal tar. According to thermogravimetric data for the residue at temperatures beyond 360°C, the content of high-boiling components is considerably higher for petroleum tar than for coal tar. However, its yield of coke residue is lower than for coal tar. The petroleum tar contains polyaromatic hydrocarbons and heterocyclic sulfur-containing compounds, both of which are also found in coal tar. However, much larger quantities of sulfur-containing quantities are seen in petroleum tar, while the content of individual polyaromatic hydrocarbons is much lower.

Abstract—In the catalytic high-temperature hydrogenation (hydrodealkylation) of a mixture of raw coke-plant benzene and the 180–230°C naphthalene fraction of coal tar, water vapor (steam) acts in two ways: it blocks the smallest pores in the catalyst, from which the removal of products is difficult; and it facilitates their desorption from the large pores, thereby decreasing the likelihood of polymerization of the reactive products of intermediate hydrocracking and dealkylation. Steam is found to play a positive role in slowing the formation of high-molecular compounds, which are sources of coke deposits on the catalyst.