Gold and silver in a system of sulfide tailings. Part 2: Reprecipitation on natural peat

Myagkaya, I. N.; Лазарева, Е. В.; Gustaytis, M. A.; Жмодик, С. М.

doi:10.1016/j.gexplo.2016.01.016

Cited by 20 publications

(12 citation statements)

References 98 publications

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“…In Fig. 7 a, tabular-shaped particles with approximately length of 30–40 μm suggested the presence of gypsum (Myagkaya et al 2016 ). In addition, typical gypsum morphology particles are detected in CE-446, Fig.…”

Section: Resultsmentioning

confidence: 98%

The formation of unsaturated zones within cemented paste backfill mixtures—effects on the release of copper, nickel, and zinc

Hamberg

Maurice

Alakangas

2018

Environ Sci Pollut Res

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Flooding of cemented paste backfill (CPB) filled mine workings is, commonly, a slow process and could lead to the formation of unsaturated zones within the CPB fillings. This facilitates the oxidation of sulfide minerals and thereby increases the risk of trace metal leaching. Pyrrhotitic tailings from a gold mine (cyanidation tailing (CT)), containing elevated concentrations of nickel (Ni), copper (Cu), and zinc (Zn), were mixed with cement and/or fly ash (1–3 wt%) to form CT-CPB mixtures. Pyrrhotite oxidation progressed more extensively during unsaturated conditions, where acidity resulted in dissolution of the Ni, Cu, and Zn associated with amorphous Fe precipitates and/or cementitious phases. The establishment of acidic, unsaturated conditions in CT-CBP:s with low fractions (1 wt%) of binders increased the Cu release (to be higher than that from CT), owing to the dissolution of Cu-associated amorphous Fe precipitates. In CT-CPB:s with relatively high proportions of binder, acidity from pyrrhotite oxidation was buffered to a greater extent. At this stage, Zn leaching increased due the occurrence of fly ash-specific Zn species soluble in alkaline conditions. Irrespective of binder proportion and water saturation level, the Ni and Zn release were lower, compared to that in CT. Fractions of Ni, Zn, and Cu associated with acid-soluble phases or amorphous Fe precipitates, susceptible to remobilization under acidic conditions, increased in tandem with binder fractions. Pyrrhotite oxidation occurred irrespective of the water saturation level in the CPB mixtures. That, in turn, poses an environmental risk, whereas a substantial proportion of Ni, Cu, and Zn was associated with acid-soluble phases.

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Section: Resultsmentioning

confidence: 98%

The formation of unsaturated zones within cemented paste backfill mixtures—effects on the release of copper, nickel, and zinc

Hamberg

Maurice

Alakangas

2018

Environ Sci Pollut Res

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“…Таким образом, комбинированные пиро-, гидрометаллургические способы позволяют добиться повышения извлечения цветных и благородных металлов, но данная технология потребует больших капитальных затрат [41][42][43].…”

Section: анализ современного состояния переработки техногенного сырьяunclassified

Analysis of the current state of technologies in the field of recycling technogenic gold-containing raw materials

Василькова

Васильков

Хмельницкая

et al. 2021

jour

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In this article, we review existing approaches to recycling technogenic raw materials (ore dumps, metallurgical production slag, mill tailings of ore-dressing plants, etc.), containing non-ferrous and noble metals, which are accumulated in almost non-ferrous metallurgy industries. An analysis of existing technologies for processing technogenic raw materials (pyrite cinders and flotation tailings of concentration plants), which include enrichment, pyro- and hydrometallurgical and combined ways of extracting valuable components, was conducted on the basis of a review of published sources. It was shown that enrichment (screening, desliming in a hydrocyclone, enrichment using a concentration table, magneticliquid separation, flotation), pyrometallurgical and combined ways for extracting noble metals from this type of raw materials are unprofitable. The most satisfactory results were obtained using hydrometallurgical methods to extract valuable components from technogenic raw materials. Various solvents, such as sodium cyanide, thiocarbamide, sodium thiosulphate and sodium sulphite were tested as leaching agents. Cyanation proved to be the most effective way to extract noble metals from technogenic raw materials; however, this process is characterised by a high consumption of sodium cyanide. Therefore, it is of importance to discover an approach to extracting valuable components from such problematic products in order to make their processing more cost-effective by reducing cyanide consumption while maintaining gold extraction. According to the obtained results, gold-containing raw materials are promising in terms of extraction of nonferrous and noble metals using hydrometallurgical technologies. Future research should identify rational methods for processing technogenic gold-containing raw materials in order to make the technology more profitable for extracting valuable components.

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“…Note that both compounds bind Hg and prevent it from migration and penetration into food chains, sometimes due to natural protective mechanisms, like detoxification by formation of Hg selenide in the liver of dolphins [13]. Besides the biological systems, mercury selenide often exists in supergene environments [14], sometimes as a secondary phase [15,16].…”

Section: Introductionmentioning

confidence: 99%

Mercury Speciation in Natural and Mining-Related Systems

Gustaytis

Myagkaya

Malov

et al. 2021

Journal of Siberian Federal University. Chemistry

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Mercury speciation and the composition of mercury phases in natural and mining-related environments is studied by the thermal release analysis combined with electrothermal atomic absorption spectroscopy (TA-ET-AAS), as well as scanning electron microscopy with energy-dispersive X-ray microanalysis (SEM-EDS). The analyses are applied to laboratory-made samples bearing mercury selenide and to field samples from sites known for relatively high natural or industrially induced Hg background. They are, namely, material from the dispersion train of the Ursk sulfide tailings (Ursk Village, Kemerovo region) and debris precipitated from snow sampled in the Kurai mercury zone (Aktash Village, Gorny Altai). The TA-ET-AAS method works well in discrimination and identification of Hg sulfide and Hg selenide provided that the samples contain sufficient amounts of both compounds, but the sum HgS + HgSe can be determined at any contents of the two compounds. The presence of both mercury sulfide and mercury selenide in the samples has been confirmed by SEM-EDS microanalysis. The temperature ranges for the mercury species (Hg2+; HgS+HgSe mixture; mercury bound with organic matter (Hg-OM), including CH3Hg+) are identical in the laboratory and field samples. Therefore, the suggested approach can ensure fast and reliable detection of Hg phases in rocks exposed to supergene alteration

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Gold and silver in a system of sulfide tailings. Part 2: Reprecipitation on natural peat

Cited by 20 publications

References 98 publications

The formation of unsaturated zones within cemented paste backfill mixtures—effects on the release of copper, nickel, and zinc

The formation of unsaturated zones within cemented paste backfill mixtures—effects on the release of copper, nickel, and zinc

Analysis of the current state of technologies in the field of recycling technogenic gold-containing raw materials

Mercury Speciation in Natural and Mining-Related Systems

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