Separation of lepidolite from hard-rock pegmatite ore via dry processing and flotation

Filippov, L.O.; Filippova, I.V.; Crumiere, Gabriel; Sousa, Rui; Leite, Mário Machado; Sousa, Ana Botelho de; Korbel, Chloé; Tripathy, Sunil Kumar

doi:10.1016/j.mineng.2022.107768

Cited by 15 publications

(6 citation statements)

References 33 publications

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“…These collectors provides good flotation of lepidolite over a wide range of pH from 2 to 11 [63]. The use of ether-amine-based collector may be an interesting alternative to primary amine because it requires lower dosages [64]. The main challenge to overcome when floating Li-micas from other silicates like quartz and albite is the lack of selectivity due to their very close surface properties [62].…”

Section: Li-mica Flotationmentioning

confidence: 99%

“…The main challenge to overcome when floating Li-micas from other silicates like quartz and albite is the lack of selectivity due to their very close surface properties [62]. However, the articles already demonstrated the feasibility of this separation on the Gonçalo pegmatite ore from Portugal with ether-amine and primary fatty ammonium acetate salt (Aeroamine 3000C), at pH 3, or on the Yichun granite ore from China with an amine-based Gemini collector [64][65][66]. [59].…”

Section: Li-mica Flotationmentioning

confidence: 99%

“…In addition, the flotation of coarse (usually above 250 µm) and platy particles is challenging since its commonly assumed that optimal particle size range for flotation is below 150 µm. This point could be addressed by using the sorting at coarse size fraction or by playing on key flotation parameters that avoid particle detachment from bubble surface like the modification of hydrodynamic regimes [64]. The recent study reported by Filippov and co-workers on the lepidolite recovery from the pegmatite ore of the Gonçalo deposit (Portugal) showed that the coarse size fractions (−2 + 0.84 mm and −0.84 + 0.24 mm) responded well to electrostatic separation resulting in a Li concentrate at >3.5% Li 2 O [64].…”

Section: Flotation Designmentioning

confidence: 99%

“…This point could be addressed by using the sorting at coarse size fraction or by playing on key flotation parameters that avoid particle detachment from bubble surface like the modification of hydrodynamic regimes [64]. The recent study reported by Filippov and co-workers on the lepidolite recovery from the pegmatite ore of the Gonçalo deposit (Portugal) showed that the coarse size fractions (−2 + 0.84 mm and −0.84 + 0.24 mm) responded well to electrostatic separation resulting in a Li concentrate at >3.5% Li 2 O [64]. The finer size fraction (−0.240 + 0.063 mm) was processed by flotation using monoetheramine as a powerful collector at 65 g/t only to obtain a lepidolite concentrate at 4.5% Li 2 O.…”

Section: Flotation Designmentioning

confidence: 99%

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Characterization and Liberation Study of the Beauvoir Granite for Lithium Mica Recovery

et al. 2023

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A significant proportion of Europe’s lithium endowment is hosted by unconventional lithium resources such as rare-metal granites (RMG) of which the Beauvoir granite in France is a prime example. In such hard-rock deposits, where lithium is mostly hosted in micas (lepidolite, zinnwaldite), the ability to assess whether lithium can be extracted economically from the ore is essential and requires a comprehensive understanding of mineralogical properties and lithium deportment. Using three exploratory drill cores distributed along the North–South axis, a preliminary geometallurgical assessment of the granite has been conducted based on a combination of techniques including Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES), Atomic Adsorption Spectroscopy (AAS), Electron Probe Microanalysis (EPMA), Scanning Electron Microscope (SEM) coupled with automated mineralogy software, X-Ray Diffraction (XRD), optical microscope and sieving. Lithium distribution appears to be variable, reflecting the evolution of the granite, with higher mica content in the southern area and higher Li grade towards the center of the orebody. The size of micas in the assessed sample does not vary significantly. The grindability and liberation size of micas varies in the different zones investigated, PERC S being the most difficult to grind. There is always more than 50 wt% of the micas that are liberated in the samples when crushed to 1 mm. Indirect estimation of Li content based on EPMA and SEM analysis suggests that the content of lithium inside mica crystals could vary. If this estimation is confirmed by direct Li measurement, it for sure makes the calculations of the Li deportment more challenging.

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Section: Li-mica Flotationmentioning

confidence: 99%

Section: Li-mica Flotationmentioning

confidence: 99%

Section: Flotation Designmentioning

confidence: 99%

Section: Flotation Designmentioning

confidence: 99%

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Characterization and Liberation Study of the Beauvoir Granite for Lithium Mica Recovery

et al. 2023

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“…to other gangue minerals i.e., quartz, albite, and K-feldspar. [12][13][14][15][16][17][18][19] The accurate quantication of lithium is essential to evaluate the performance of lepidolite concentration, as lithium is the element that distinguishes lepidolite from gangue minerals. Traditional quantication methods, such as inductively coupled plasma optical emission spectroscopy/mass spectrometry (ICP-OES/ICP-MS) or atomic absorption spectroscopy (AAS), involve complex sample preparation and hinder inline quantication, limiting exibility in processing plants and being time-consuming.…”

Section: Introductionmentioning

confidence: 99%