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Use of Ash and Slag Waste from Thermal Power Plants for the Production of Rare Earth Compounds and Ceramic Membranes

  • Inorganic Synthesis and Industrial Inorganic Chemistry
  • Published:
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Abstract

The processing of ash/slag wastes were studied, while a complete analysis of the bottom ash of the Luchegorsk thermal power plant in the Primorsky Territory was carried out, and a study was performed on the separation of rare earth elements by various methods. The ash was previously cleaned from unburned coal (underburnt) and iron oxides, the resulting product was processed with various methods. Isolation and separation of products was carried out in several stages. The acidity of the medium was determined, which corresponds to the quantitative precipitation of iron and aluminum matrix ions depending on the initial concentrations of the solutions. Silicon oxide of 97% purity with a high specific surface area was obtained, as well as a solid product with a content of rare earth elements more than 100 times higher than in the original ash samples. The content of rare earth elements in the final product is 74.5% of the content of these elements in the original material, and the product is also enriched with other trace elements such as zirconium, hafnium, and tungsten. When the ash is processed, solid waste remains, which can be further utilized to fabricate ceramic materials and membranes with high technical performance.

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Authors and Affiliations

  1. Far Eastern Federal University, 690922, Vladivostok, Russia

    N. P. Shapkin, A. L. Shkuratov, A. V. Taskin, I. G. Khal’chenko, N. V. Maslova & A. N. Fedorets

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  1. N. P. Shapkin
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  2. A. L. Shkuratov
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  3. A. V. Taskin
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  4. I. G. Khal’chenko
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  5. N. V. Maslova
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  6. A. N. Fedorets
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Correspondence to N. P. Shapkin.

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N.P. Shapkin: implementation of separate stages of ash and slag waste decomposition; decomposition of alkaline melt with a mixture of carbonates by treatment with water and acids; separation of silicic acid and aluminum hydroxide from leaching products; reprecipitation of aluminum hydroxide for its purification. A.L. Shkuratov: fusion of samples in muffle furnaces, precipitation of elements at different pH values, production of membrane materials, atomic emission analysis. A.V. Taskin: sampling of ash and slag waste at the landfill, mechanochemical preparation and enrichment of ash and slag waste, processing of samples in an autoclave. I.G. Khalchenko: implementation of the stages of acid and water leaching of the product of ash and slag waste autoclaving, determination of the operational characteristics of membranes; N.V. Maslova: determination of the elemental composition of some samples; A.N. Fedorets: obtaining of SEM images of the surface, analysis of XRD patterns.

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Shapkin, N.P., Shkuratov, A.L., Taskin, A.V. et al. Use of Ash and Slag Waste from Thermal Power Plants for the Production of Rare Earth Compounds and Ceramic Membranes. Russ J Appl Chem 95, 1394–1403 (2022). https://doi.org/10.1134/S1070427222090154

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  • DOI: https://doi.org/10.1134/S1070427222090154

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