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ArticleName Improvement of the fine coking coal flotation technolgy
DOI 10.17580/or.2021.03.02
ArticleAuthor Alexandrova T. N., Kuskov V. B., Afanasova A. V., Kuznetsov V. V.

Saint-Petersburg Mining University (St. Petersburg, Russia):

Aleksandrova Т. N., Head of Chair, Doctor of Engineering Sciences, Professor,
Kuskov V. B., Associate Professor, Candidate of Engineering Sciences, Associate Professor,
Afanasova А. V., Teaching Assistant, Candidate of Engineering Sciences,
Kuznetsov V. V., Postgraduate Student


The paper presents data on the development of a reagent regime for the flotation of fine coal fractions of –0.5+0 mm. The study focuses on coking coal from the Butovskaya mine (Kemerovo coal deposit, Russia). The ash content in the rock mass mined ranges from 23 to 30 %. Using the methods of optical microscopy, the presence of rock-forming minerals in the flotation feed, mainly represented by silicates (quartz), was established, which supports the addition of liquid glass to the process as a depressant for silicates. The study of the flotation kinetics allowed establishing the coal flotation time for a more complete recovery of the combustible matter. The paper compares the basic and alternative reagent regimes. The basic regime is represented by an apolar collector in the form of a mixture of hydrocarbon liquids of petroleum origin and a frother containing oxygen-bearing chemical compounds of various molecular structures in its group chemical composition. The alternative regime includes a depressant (liquid glass), an apolar collector (diesel fuel), and a frother represented by a mixture of aliphatic alcohols, ethers, and esters. Using the technology developed, coal flotation concentrate was obtained with the mass fraction of ash of 7.36 % and recovery of 9.78 %, allowing to generate a product meeting the requirements of GOST R 51588-2000.
The work was carried out with the support of the Russian Science Foundation (project No. 19-17-00096).

keywords Coking coal, coal slimes, flotation, densimetric analysis, coal concentrate, ash content, combustible matter

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