Developing flotation reagents for niobium oxide recovery from carbonatite Nb ores

Ni, Xiao; Parrent, Marc; Cao, Mingcui; Huang, Liubin; Bouajila, Ahmed; Liu, Qingxia

doi:10.1016/j.mineng.2012.03.003

Cited by 42 publications

(11 citation statements)

References 9 publications

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“…After adding 500 g/t sodium metaphosphate, the carbonate recovery was lowered to only 3?8% and niobium oxide recovery was still 50%. 15 The results demonstrated the selectivity of sodium metaphosphate in the flotation of pyrochlore from carbonatite niobium ores. The origin of selectivity of the metaphosphate was studied in this work.…”

Section: Introductionmentioning

confidence: 83%

“…12 They were also found as selective depressants for the carbonate gangues in the flotation of pyrochlore from carbonatite niobium ores. 15 Ni et al 15 showed that hydroxamic acid and sodium metaphosphate formed a suitable reagent combination for the flotation of this type of ore. The addition of sodium metaphosphate could depress the carbonate minerals without significantly adversely affecting pyrochlore recovery.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption behaviour of sodium hexametaphosphate on pyrochlore and calcite

Liu

2013

Canadian Metallurgical Quarterly

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FTIR, XPS and zeta potential measurements were performed on pyrochlore and calcite to study the adsorption mechanisms of sodium hexametaphosphate (NaHMP). While no hexametaphosphate could be detected on the FTIR spectra of NaHMP treated pyrochlore or calcite, the observed chemical shifts of the binding energies of Ca 2p 5/2 (0?25 eV) and P 2p (0?20 eV) electrons indicated that the hexametaphosphate groups formed a complex with calcium on calcite. The complex seemed soluble in water leaving a low concentration of its residue on calcite surface after water washing, thus undetectable by FTIR. The binding energy shifts of Nb 3d 5/2 (0?13 eV) and Ca 2p 5/2 (0?10 eV) electrons on NaHMP-treated pyrochlore were within instrumental resolution, therefore, NaHMP was not strongly bound to pyrochlore. The zeta potentials of pyrochlore and calcite were both lowered in the presence of NaHMP. However, for pyrochlore, the zeta potential drop occurred mainly in the acidic pH range, while the drop for calcite was independent of pH, indicating possible chemisorption of NaHMP on calcite. The work explained the selective depressive function of NaHMP in the hydroxamic acid flotation of carbonatite niobium ores.On a effectué des mesures de FTIR, de XPS et de potentiel zê ta du pyrochlore et de la calcite afin d'é tudier les mé canismes d'adsorption de l'hexamé tahosphate de sodium (NaHMP). Bien qu'on ne puisse pas dé tecter d'hexamé taphosphate dans les spectres de FTIR du pyrochlore ou de la calcite traité s au NaHMP, les dé calages chimiques observé s des é nergies de liaison des électrons de Ca 2p 5/2 (0?25 eV) et de P 2p (0?20 eV) indiquaient que les groupes d'hexamé taphosphate formaient un complexe avec le calcium sur la calcite. Le complexe semblait soluble dans l'eau, laissant une faible concentration de son ré sidu à la surface de la calcite aprè s lavage à l'eau, donc indé tectable par FTIR. Les dé calages de l'é nergie de liaison des é lectrons du Nb 3d 5/2 (0?13 eV) et du Ca 2p 5/2 (0?10 eV) du pyrochlore traité au NaHMP se situaient dans les limites de ré solution de l'instrument. Donc, le NaHMP n'é tait pas fortement lié au pyrochlore. Les potentiels zê ta du pyrochlore et de la calcite s'abaissaient tous deux en pré sence de NaHMP. Cependant, la chute de potentiel zê ta du pyrochlore se produisait principalement dans la gamme de pH acide, alors que la chute pour la calcite é tait indé pendante du pH, indiquant la possibilité d'une chemisorption du NaHMP sur la calcite. Ce travail explique la fonction sé lective et dé pressive du NaHMP lors de la flottation à l'acide hydroxamique des minerais de carbonite de niobium.

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Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Adsorption behaviour of sodium hexametaphosphate on pyrochlore and calcite

Liu

2013

Canadian Metallurgical Quarterly

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“…As applied in mineral processing, styrene phosphonic acid (SPA) and diphosphonic acid (DPA) have been adopted as collectors for flotation recovery of metal oxide minerals [14,15]. Zhang and Chen concluded that DPA was an effective collector for fersmite and niobite [16,17].…”

Section: Introductionmentioning

confidence: 99%

Flotation performances and adsorption mechanism of α-hydroxyoctyl phosphinic acid to cassiterite

Zhong

Gang

et al. 2015

Applied Surface Science

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“…These collectors are mixtures of hydroxamic acids and alcohols that have been previously used as collectors in various flotation systems [56][57][58]. Aerofroth-70 (containing methyl isobutyl carbinol) was obtained from Cytec Canada and was used as frother in the course of micro-flotation tests.…”

Section: Chemical Reagentsmentioning

confidence: 99%