Specificity of properties of coal processing waste regarding their storage

Despite the progress in green energy, the strategy of most coal-rich countries is to increase coal production in the next 20 years, which makes the issue of storage and reuse of coal processing waste one of the most urgent problems in the industry. In connection with the prospects for the secondary use of waste, the technology of separate coal waste disposal in dumps becomes more widespread. Separate disposal of coal-bearing rocks, sludge and slurry, leads to the formation of a heterogeneous soil body, which explains the relevance of studying patterns of waste properties formation and their changes in time. The results of laboratory testing of coal processing waste from the plant in the Pechora coal basin are presented. The mixtures of wastes in various proportions were tested, as well as samples from the already constructed dump. Drained direct shear tests demonstrate similar values of the angle of internal friction and cohesion for various types of waste:  = 29°–32°, C = 27–50 kPa. Nonetheless, the undrained shear strength of slurry is much lower, which justifies the need to take into account pore pressure when increasing the height of dumps. Based on the results the recommendations concerning ensuring the long-term stability of the dumps are provided.

Kutepova N. A., Moseykin V. V., Kondakova V. N., Pospehov G. B., Straupnik I. A. Specificity of properties of coal processing waste regarding their storage. MIAB. Mining Inf. Anal. Bull. 2022;(12):77-93. [In Russ]. DOI: 10.25018/0236_1493_2022_12_0_77.

N.A. Kutepova¹, Dr. Sci. (Eng.), Chief Researcher, e-mail: Kutepova_NA@pers.spmi.ru, Scopus ID: 57192982854,
V.V. Moseykin, Dr. Sci. (Eng.), Professor, National University of Science and Technology «MISiS», 119049, Moscow, Russia, e-mail: moseikin.vv@misis.ru, ORCID ID: 0000-0002-2286-1480,
V.N. Kondakova¹, Graduate Student, e-mail: s185009@stud.spmi.ru, ORCID ID: 0000-0002-4883-7972,
G.B. Pospehov¹, Cand. Sci. (Geol. Mineral.), Assistant Professor, Leading Researcher, e-mail: pospehov@spmi.ru, ORCID ID: 0000-0001-9090-5150,
I.A. Straupnik¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: Straupnik_IA@pers.spmi.ru, Scopus ID: 57195337967,
¹ Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

V.N. Kondakova, e-mail: s185009@stud.spmi.ru.

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