The effect of mechanical grinding and thermal treatment on the recovery of rare earth elements (REEs) from kaolinite

Ji, Bin; Zhang, Wencai

doi:10.1016/j.powtec.2021.08.077

Cited by 16 publications

(7 citation statements)

References 40 publications

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“…3(a)), the interlayers of kaolinite in the coal waste were dehydrated and disintegrated during calcination, and as a result, the kaolinite particles were expanded. This phenomenon has been previously reported [29][30][31][32]. During the acid leaching process, the calcined coal waste was mixed with an acid solution through magnetic stirring.…”

Section: Ree Mineralogy In the Leaching Solid Residue Of The Western ...supporting

confidence: 72%

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

Tang

et al. 2022

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Section: Ree Mineralogy In the Leaching Solid Residue Of The Western ...supporting

confidence: 72%

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

Tang

et al. 2022

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“…In recent years, the recovery of valuable components from solid waste resources by a mechanochemical process has attracted extensive attention from researchers, such as recovered REEs from NdFeB wastes, waste fluorescent powders, mixed concentrates, , etc. The mechanochemical reaction mainly uses the grinding ball to produce an all-round mechanical impact in a confined space, and the solid particles are undergoing physical and chemical changes of “broken reorganization” all the time so as to improve the leaching rate of the valuable components and have the advantages of low energy, high efficiency, less waste liquid, and greenness.…”

Section: Introductionmentioning

confidence: 99%

Transformation of YF₃ into Y(OH)₃ by a Mechanochemical Process: Extracting Yttrium from Rare Earth Smelting Slag under Mild Conditions

Liu

Zhou

et al. 2023

ACS Sustainable Chem. Eng.

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The yttrium (Y) element in the calciothermic reduction YF3 smelting slag (YSS) has a recovery value, and the conventional direct alkali transformation-acid leaching method of recovering rare earth elements (REEs) from solid waste, which contains rare earth fluoride, has encountered problems of high energy and alkali consumption and low leaching rate. In this study, a green process for the transformation of YF3 to Y(OH)3 at room temperature was achieved by employing a mechanochemical method. The process is environment-friendly, with zero emission, less acid/alkali consumption, and water recyclability. It was found that YF3 will be “passivated” by a newly formed Y(OH)3 product layer under the alkaline condition, resulting in the unsustainable transformation of YF3 to Y(OH)3. However, the mechanical force could destroy the coating of Y(OH)3 and promoted the transformation of YF3 to Y(OH)3 completely; as such, the transformation efficiency of YF3 reached 98.2%. On this basis, the process of extracting Y from YSS was further studied, and the results showed that YF3 in YSS was successfully transformed into Y(OH)3 and the leaching rate of Y reached 96.2%. Therefore, it is expected to be a new technology to recover REEs from waste slag or minerals that contain rare earth fluoride and has good industrial application prospect.

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“…Ore texture features distinctively influence particle fragmentation, mineral liberation and fracture energy [23]. Ji and Zhang [24] studied the effect of mechanical grinding and thermal treatment on the recovery of Rare Earth Elements (REEs) from kaolinite. They showed that mechanical grinding for 4 hours completely destroyed the crystal structure of the material, but recovery of the total REEs was less than 20%.…”

Section: Introductionmentioning

confidence: 99%

Influence of Preheating on the Grindability of Mono/Poli Mineral Ores

rizk

2023

JES. Journal of Engineering Sciences

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In grinding practice, heterogeneous poli-mineral systems are more common than homogeneous mono-mineral system. The heterogeneity of raw materials in mineral beneficiation grinding circuit results by virtue of the varying properties of mineral constituents in an ore. In this investigation the effect of particle size and preheating conditions on the grindability of quartz as a mono-mineral ore, and nepheline syenite as a poli-mineral one was studied. 2n Factorial method was applied to arrange the studied parameters affecting the preheating of each of the two studied ores according to the importance of their relative effect on its grindability. The results revealed that incremented percentage of -200 µm in the preheated ground poli-mineral ore was less than that of monomineral one by about 32.9%. This behavior was interpreted by containing nepheline syenite on more than one mineral, consequently, phase change and anisotropic thermal expansion or contraction of the grain boundaries have a markedly effect on the grindability of preheated rocks, especially those contain more than one mineral.

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The effect of mechanical grinding and thermal treatment on the recovery of rare earth elements (REEs) from kaolinite

Cited by 16 publications

References 40 publications

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

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

Transformation of YF₃ into Y(OH)₃ by a Mechanochemical Process: Extracting Yttrium from Rare Earth Smelting Slag under Mild Conditions

Influence of Preheating on the Grindability of Mono/Poli Mineral Ores

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The effect of mechanical grinding and thermal treatment on the recovery of rare earth elements (REEs) from kaolinite

Cited by 16 publications

References 40 publications

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

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

Transformation of YF3 into Y(OH)3 by a Mechanochemical Process: Extracting Yttrium from Rare Earth Smelting Slag under Mild Conditions

Influence of Preheating on the Grindability of Mono/Poli Mineral Ores

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Transformation of YF₃ into Y(OH)₃ by a Mechanochemical Process: Extracting Yttrium from Rare Earth Smelting Slag under Mild Conditions