Modes of occurrence of tungsten in coals: a review

Arbuzov, S.I.; Toropov, A.S.; Ilenok, S.S.; Ivanov, V.P.; Kholodov, A.S.; Zarubina, N.V.; Ivanov, V.V.

Авторы: Arbuzov Sergey I., Toropov Andrey S., Ilenok Sergey S., Ivanov Vladimir P., Kholodov Aleksei S., Zarubina Natalia V., Ivanov Vladimir V.
Журнал: Известия Томского политехнического университета. Инжиниринг георесурсов
Том: 335
Номер: 7
Год издания: 2024
Издательство: ГОУ ВПО ТПУ
Местоположение издательства: Томск
Первая страница: 121
Последняя страница: 140
DOI: 10.18799/24131830/2024/7/4678
Аннотация: Abstract. Relevance.The necessity to know the conditions and forms of W concentration in coals for solving a number of scientific and engineering problems at complex development of coal deposits. Aim.Complex estimation of W modes of occur-rence in coal for development of measures for rational ecologically safe use of coal. Methods.Correlation analysis, scanning electron microscopy, infrared spectroscopy, coal group analysis, inductively coupled plasma mass spectrometry, instrumen-tal neutron activation analysis. Results and conclusions.The modes of occurrence of W in coal were studied by a complex of methods. In the majority of W-enriched coal deposits, a negative significant correlation of its content in coal and coal ash with ash yield was found, indicating its association with organic matter. Using the method of coal group composition analysis, it was found that the main carrier and concentrator of W in the studied lignite deposits is organic matter. The contribution of the mineral phase in general in W-rich coals and in coals with its normal content does not exceed 20%, usually less than 5%. These conclusions are also confirmed by infrared spectroscopy data, according to which no more than 15% of the metal in the samples studied is associated with mineral phases. The association of W with high molecular humic acids predominates. In anomalously W-enriched lignites, the humic acid phase represents 76 to 88% of the gross metal content. The role of bitu-men and low-molecular-weight humic acids in the balance of W is marginal at their different levels in the coals. Mineral phas-es of W are not characteristic of coal. Nano-microinclusions of scheelite, wolframite, hubnerite and ferberite were recorded as isolated occurrences. The main mineral phases are associated with Fe and Mn hydroxides, in which W is presented as a trace element in the amount of 1–5% together with other elements (Ge, As, etc.). In more metamorphosed bituminous and anthra-cite coals, authigenic mineral formations were found, represented by tungstite, phyllotungstite,native W and complex Fe-Mn-Ca-W-O mineral phases.
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Modes of occurrence of tungsten in coals: a reviewстатья

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