Ash residue beneficiation and processing technology

The issues connected with concentration of rare earth elements from ash residue of Chita Thermal Power Plant 2 using the methods of ore pretreatment and magnetic separation are studied. The applicability of the hydrochemical processing in recovery of rare earth elements from ash residue is determined. The processing technology is developed for ash residue, including pretreatment, magnetic separation, heavy medium separation or flotation, and leaching. The experimental research findings on the chemical composition of the test ash residue, its electromagnetic separation, as well as the contents of rare earth elements before and after leaching in nitrogen and hydrochloric acids, and in sulfuric and nitrohydrochloric acids are presented. The experimental results allow drawing a conclusion that leaching essentially reduces the content of rare earth elements in ash residue as these elements are transferred to solution and are made extractable later on. Regarding the ash residue from Chita Thermal Power Plant 2, titanium, strontium, gallium and rubidium exhibit the highest extraction ratios. The aim of the studies was mitigation of the environmental impact of ash residue from coal combustion at Chita Thermal Power Plant 2 by means of beneficiation and processing with manufacture of marketable products (rare earth elements).

Keywords: ash residue, adverse effect, environment, beneficiation, electromagnetic separation, leaching, content, rare earth elements, technology, extraction.
For citation:

Razmakhnin K. K., Khatkova A. N., Shumilova L. V., Nomokonova T. S. Ash residue beneficiation and processing technology. MIAB. Mining Inf. Anal. Bull. 2023;(10):122–135. [In Russ]. DOI: 10.25018/0236_1493_2023_10_0_122.


The study was supported by the Russian Science Foundation, Project No. 22-17-00040: Scientific Substantiation and Development of Environmentally Clean and Wasteless Technologies for Treatment of Natural and Manmade Mineral Raw Materials, 2022– 2023.

Issue number: 10
Year: 2023
Page number: 122-135
ISBN: 0236-1493
UDK: 622.7:553.556: 622.353.4.004
DOI: 10.25018/0236_1493_2023_10_0_122
Article receipt date: 02.05.2023
Date of review receipt: 31.07.2023
Date of the editorial board′s decision on the article′s publishing: 10.09.2021
About authors:

K.K. Razmakhnin1, Dr. Sci. (Eng.), Assistant Professor, e-mail:, ORCID ID: 0000-0003-2944-7642,
A.N. Khatkova1, Dr. Sci. (Eng.), Professor, e-mail:, ORCID ID: 0000-0001-6527-0026,
L.V. Shumilova1, Dr. Sci. (Eng.), Professor, e-mail:, ORCID ID: 0000-0001-5991-9204,
T.S. Nomokonova1, Graduate Student, e-mail:, ORCID ID: 0009-0002-9096-864X,
1 Transbaikal State University, 672039, Chita, Russia.


For contacts:

K.K. Razmakhnin, e-mail:


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