Leaching recovery of rare earth elements from the calcination product of a coal coarse refuse using organic acids

Ji, Bin; Li, Qi; Zhang, Wencai

doi:10.1016/j.jre.2020.11.021

Cited by 45 publications

(9 citation statements)

References 38 publications

(49 reference statements)

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“…The introduction of organic matter leads to a sharp acceleration of the process of the transition of REE into the solution. Similar results were obtained in [ 75 , 76 ], where the studied materials—tailings, ore containing REE—were leached with separate organic acids. The total increase in the mass of dissolved REE is proportional to the increase in the introduced organic matter.…”

Section: Resultssupporting

confidence: 85%

Conditions Affecting the Release of Heavy and Rare Earth Metals from the Mine Tailings Kola Subarctic

Krasavtseva

Maksimova

Макаров

2021

Toxics

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In the Kola Subarctic, a mining industry has developed, which is a source of environmental pollution with heavy metals. The objects of study were the tailings of three large mining enterprises in the region: apatite-nepheline, complex and loparite ores. The geotechnical characteristics were studied, and the granulometric composition of the samples was established. The main minerals that make up the material of ore dressing tailings have been determined. Using inductively coupled plasma mass spectrometry, the content of trace elements, in particular heavy metals and rare earth elements, has been established. The enrichment factor, the geoaccumulation indexes, the potential ecological risk index factor and the potential environmental hazard index have been calculated. Priority pollutants characteristics for specific objects have been identified. It is noted that the finely dispersed material of the tailings of loparite and complex ores is 1.5–3 times enriched in heavy and rare earth metals in comparison with the total material of the tailings. In laboratory conditions, experiments were carried out to simulate the process of interaction of dust particles with soil solutions containing different amounts of dissolved organic matter and at average seasonal temperatures. It was found that a decrease in the pH of the solution and an increase in the amount of organic carbon and temperature lead to the mobilization of heavy and rare earth metals from the tailings.

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Section: Resultssupporting

confidence: 85%

Conditions Affecting the Release of Heavy and Rare Earth Metals from the Mine Tailings Kola Subarctic

Krasavtseva

Maksimova

Макаров

2021

Toxics

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“…Acid leaching is an efficient, economical, and widely used process in the rare metal metallurgical industry and has an absolutely necessary role in rare earth recovery from coal fly ash. Hence, the leachability of rare earth in the three samples was evaluated using mineral acid (HCl acid) and organic acid (citric acid) at the specific conditions verified in previous research [ 22 , 23 , 24 , 45 ]. On the whole, the recovery of REY using HCl acid is higher than that using citric acid from Figure 8 .…”

Section: Resultsmentioning

confidence: 99%

“…Acid leaching is a process for metal extraction from primary and secondary resources and is also used for the identification of metal leaching ability at specific conditions. The REY leaching ability was defined by hydrochloric acid and citric acid (as a proxy for mineral and organic acid leaching) under measurable conditions based on the reported literature [ 22 , 23 , 24 ]. The hydrochloride acid leaching was performed in the beaker with the conditions: T = 60 °C, the concentration of 3 M, the liquid–solid ratio of 10 (volume/mass, v / m ), leaching time of 120 min, and magnetic stirring speed of 200 rpm.…”

Section: Methodsmentioning

confidence: 99%

The Discrepancy between Coal Ash from Muffle, Circulating Fluidized Bed (CFB), and Pulverized Coal (PC) Furnaces, with a Focus on the Recovery of Iron and Rare Earth Elements

et al. 2022

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Coal ash (CA) is not only one of the most solid wastes from combustion, easily resulting in a series of concerns, but it is also an artificial deposit with considerable metals, such as iron and rare earth. The variation in the coal ash characteristics due to the origins, combustion process, and even storage environment has been hindering the metal utilization from coal ash. In this study, three ash sample from lab muffle, circulating fluidized bed (CFB), and pulverized coal (PC) furnace was derived for the discrepancy study from the combustion furnace, including properties, iron, and rare earth recovery. The origins of the coal feed samples have more of an effect on their properties than combustion furnaces. Magnetic separation is suitable for coal ash from PC because of the magnetite product, and the iron content is 58% in the Mag-1 fraction, with a yield of 3%. The particles in CA from CFB appear irregular and fragmental, while those from PC appear spherical with a smooth surface. The results of sequential chemical extraction and observation both indicated that the aluminosilicate phase plays an essential role in rare earth occurrences. Rare earth in CA from muffling and CFB is facilely leached, with a recovery of approximately 50%, which is higher than that from PC ash. This paper aims to offer a reference to easily understand the difference in metal recovery from coal ash.

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“…The reaction temperature was controlled using a water bath, while solid/ liquid mixing was achieved using a magnetic stirrer. Detailed descriptions of the leaching apparatus have been published previously [19,22]. For each test, 2.5-g solid was mixed with 250-mL HCl solution of 1.2 M, and the reaction temperature was fixed at 75 • C. The leaching conditions were consistent with those used in the authors' prior studies on REE recovery from coal refuse [18,19,23].…”

Section: Acid Leaching Testsmentioning

confidence: 99%

Rare earth elements (REEs) recovery from coal waste of the Western Kentucky No. 13 and Fire Clay seams. Part II: Re-investigation on the effect of calcination

Leaching recovery of rare earth elements from the calcination product of a coal coarse refuse using organic acids

Cited by 45 publications

References 38 publications

Conditions Affecting the Release of Heavy and Rare Earth Metals from the Mine Tailings Kola Subarctic

Conditions Affecting the Release of Heavy and Rare Earth Metals from the Mine Tailings Kola Subarctic

The Discrepancy between Coal Ash from Muffle, Circulating Fluidized Bed (CFB), and Pulverized Coal (PC) Furnaces, with a Focus on the Recovery of Iron and Rare Earth Elements

Rare earth elements (REEs) recovery from coal waste of the Western Kentucky No. 13 and Fire Clay seams. Part II: Re-investigation on the effect of calcination

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