Leaching ability of strategically important elements from middle-miocene coals ash of the sergeevskoye brown coal deposit (priamurie)

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Abstract

Using a set of analytical methods, the mineralogy and behavior of strategically valuable elements during their leaching from coal ash from the Sergeevskoye deposit were studied under different conditions of a laboratory experiment. The use of a sequential three-stage leaching scheme (water–alkali–acid) caused a significant (up to 97%) decrease in the concentration of most elements in the ash residue. It was found that the bulk of rare earth elements in the ash are present in the form of oxides that are readily soluble in acid; non-leachable rare earth elements are in the form of phosphate minerals similar in composition to monazite and xenotime. The maximum (70–100%) extraction of most strategically valuable elements occurs with a single-stage treatment of ash with concentrated hydrochloric acid (4.8 M) for an hour at 75°C.

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About the authors

V. I. Radomskaya

Institute of Geology and Natural Management of Far Eastern Branch of Russian Academy of Sciences (IGNM FEB RAS)

Author for correspondence.
Email: radomskaya@ascnet.ru
Russian Federation, Blagoveshchensk

L. P. Shumilova

Institute of Geology and Natural Management of Far Eastern Branch of Russian Academy of Sciences (IGNM FEB RAS)

Email: shumilova.85@mail.ru
Russian Federation, Blagoveshchensk

A. P. Sorokin

Institute of Geology and Natural Management of Far Eastern Branch of Russian Academy of Sciences (IGNM FEB RAS)

Email: sorokinap@ignm.ru
Russian Federation, Blagoveshchensk

B. R. Soktoev

National Research Tomsk Polytechnic University

Email: bulatsoktoev@tpu.ru
Russian Federation, Tomsk

V. V. Ivanov

Far East Geological Institute, Far East Branch, Russian Academy of Sciences (FEGI FEB RAS)

Email: d159327@yandex.ru
Russian Federation, Vladivostok

L. M. Pavlova

Institute of Geology and Natural Management of Far Eastern Branch of Russian Academy of Sciences (IGNM FEB RAS)

Email: pav@ascnet.ru
Russian Federation, Blagoveshchensk

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Supplementary files

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2. Fig. 1. TG and DSC curves of coal from the Sergeevskoye deposit in an argon atmosphere.

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3. Fig. 2. EDS spectra of mineral grains in coal ash from the Sergeevskoye deposit (sample U-1): a - silicates (zircon); b - tungsten oxide; c - REE phosphates.

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4. Fig. 3. IR spectra of samples: a - original ash (Z-1) and ash after treatment with water (Z-1tv); b - original ash (U-1) and ash after treatment with water (U-1tv).

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5. Fig. 4. IR spectra of samples: a - ash treated with water (U-1tv) and ash treated successively with water and alkali (U-1tv-OH); b - ash treated with water (Z-1tv) and ash treated successively with water and alkali (Z-1tv-OH).

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6. Fig. 5. EDS spectra of mineral grains in coal ash from the Sergeevskoye deposit after successive treatment with water and alkali (sample Z-1tv-OH): a — Cr and Fe; b — Au, Ag and Cu; c — monazite; d — oxides of Sn, Ni and Cu.

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7. Fig. 6. IR spectra of ash samples: a - after successive treatment with water and alkali (U-1tv-OH) and water, alkali and acid (U-1tv-OH-kt); b - after successive treatment with water and alkali (Z-1tv-OH) and water, alkali and acid (Z-1tv-OH-kt).

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8. Fig. 7. IR spectra of samples: a - original ash (U-1) and ash treated with hydrochloric acid (U-1kt); b - original ash (Z-1) and ash treated with hydrochloric acid (Z-1kt).

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