Vol 62, No 8 (2019)

Methods and conditions are outlined for improving Kemerovo coal from the Kuznetsk Basin, which is of little value for coking. The basic methods employed are gravitational fractional separation of dust samples (0.2–3.0 mm) in liquids of different density; and flotational enrichment of coal fines (<0.2 mm). Such operations permit considerable improvement of regular coal, with increase in the content of clinkering vitrinite components and considerable decrease in calcium-oxide content in the ash. The required values are obtained for the basicity index of the ash, the reactivity (CRI) of the coke, and its strength after reaction with CO₂ (CSR). The coal’s rank is increased, reflecting its greater suitability for coking.

By box coking of experimental batch that simulates the industrial batch at OAO Altai-Koks, a model is formulated for predicting the quality (M₂₅, M₁₀) of laboratory coke on the basis of the coking indices \(C{{I}^{{{{V}_{{\text{o}}}}}}}\) and CI. The relation derived between the quality (M₂₅, M₁₀) of the box coke and the quality (M₂₅, M₁₀) of industrial coke produced by wet and dry quenching permits prediction of M₂₅ and M₁₀ for the industrial coke on the basis of predicted or experimental M₂₅ and M₁₀ values for the box coke. By that means, ongoing determination of the M₂₅ and M₁₀ values of industrial coke produced with wet and dry quenching is possible in the following circumstances:—in correcting production batch on the basis of the coal components available in the store and other nearby coal resources;—in correcting production batch by means of outside concentrates not currently available at the plant;—in analysis of the reasons for quality changes of the coke at any moment;—in developing promising batches as the market for coking coal changes.

Carbon sorbents are derived from Kuznetsk Basin D, G, SS, and T coal by alkali activation. Their specific surface is estimated. The elemental composition of the sorbents is determined by X-ray fluorescent microanalysis. The composition of the surface oxygen-bearing groups is analyzed by titration. The ability of the sorbents to extract pollutant ions—specifically, iron(III), chromium(III), manganese(II), cadmium(II), molybdenum(VI), and nickel(II) cations and nitrite, nitrate, chloride, and fluoride anions—from aqueous solutions is analyzed. The carbon sorbents differ in their ability to absorb various pollutants from water. In water treatment, the sorbent that best matches the impurities to be removed must be selected.