Authors: T.G. Cherkasova, D.A. Barantsev, V.A. Plotnikov, A.V. Tikhomirova, E.S. Legocheva

Title of the article: Hydrofluorination of coal ash of Kuzbass thermal coal

Year: 2023, Issue: 5, Pages: 40-46

Branch of knowledge: 2.6.8. Technology of rare, scattered and radioactive elements

Index UDK: 502.171: 661.183.4:661.482:662.613.1

DOI: 10.26730/1999-4125-2023-5-40-46

Abstract: The constantly growing volumes of ash and slag waste (ASW) in the Russian Federation create environmental and economic problems related to the anthropogenic impact on the environment and the need to allocate territories suitable for economic activity for their storage. In order to reduce this negative impact, it is necessary to increase the level of recycling of this type of waste. In terms of raw materials, ASW can be considered as complex ores that have valuable components in their composition, such as rare and rare earth elements. The mineral composition of the ASW has a large proportion of aluminosilicates, which, due to their physical and chemical properties, have a limited number of separation methods. The article presents the results of fluoridation of ash and slag waste of Kuzbass energy coals taken from the enterprise "Central Processing Plant "Berezovskaya"", Berezovsky. A laboratory installation suitable for carrying out the fluorination process is described. In the initial sample, the silicon content is 54.54% by weight, in terms of SiO2, whereas after fluorination, the residual content is 0.47% by weight. In addition, an ammonium hexafluorosilicate precipitation product with a silicon content of 99.62% by weight in terms of SiO2 was obtained. The conclusion is made about the high efficiency of this method in the separation of silicon and, as a consequence, the possibility of concentrating micro-components.

Key words: silicon ash and slag waste sublimation fluoridation ammonium hydrofluoride laboratory installation concentration of microelements

Receiving date: 30.05.2023

Approval date: 20.11.2023

Publication date: 30.11.2023

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