Selective flotation of ilmenite from olivine using the acidified water glass as depressant

Yang, Yaohui; Xu, Longhua; Tian, Jia; Liu, Yachuan; Han, Yuexin

doi:10.1016/j.minpro.2016.10.001

Cited by 54 publications

(11 citation statements)

References 20 publications

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“…At present, the main collectors that are being studied in ilmenite flotation are fatty acids or their salts [11][12][13][14]. However, one outstanding issue to be solved is that these collectors are not completely ionized, and they exist mostly in molecular forms under acidic conditions (the required pH range for practical yields from ilmenite), which generally leads to a low effectiveness of collector species in solution, and thus a lower recovery rate or a higher rate of collector consumption in flotation.…”

Section: Introductionmentioning

confidence: 99%

The Performance and Adsorption Mechanism of a Novel Collector, Dodecyl Dimethyl Betaine (BS-12), for the Flotation Separation of Ilmenite and Titanaugite

et al. 2020

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In this paper, a novel collector, dodecyl dimethyl betaine (BS-12), was used in the selective separation of ilmenite from titanaugite. The flotation performance and associated adsorption mechanism were studied by micro-flotation experiments, particle size analysis, Fourier-transform infrared (FT-IR) spectroscopy analysis, and X-ray photoelectron spectroscopy (XPS) analysis. The micro-flotation results indicated that BS-12 exhibited a stronger collecting ability towards ilmenite than titanaugite within an acidic pH range, and that the recovery of ilmenite was about 50% higher than that of titanaugite under the optimum flotation conditions. Particle size analysis demonstrated that BS-12 could selectively agglomerate ilmenite to a certain extent and then contribute to the flotation difference between ilmenite and titanaugite. FT-IR results showed some characteristic bands of BS-12 on treated ilmenite, and on titanaugite with BS-12. The XPS analysis further confirmed that BS-12 chemisorbed onto ilmenite and titanaugite in a similar way, but the limited active sites on titanaugite in comparison with ilmenite accounted for their differences in flotation.

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Section: Introductionmentioning

confidence: 99%

The Performance and Adsorption Mechanism of a Novel Collector, Dodecyl Dimethyl Betaine (BS-12), for the Flotation Separation of Ilmenite and Titanaugite

et al. 2020

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“…In the first part of this article, based on literature, we acidified sodium silicate with three acids (sulfuric, oxalic and hydrochloric) to improve its performance. Indeed, acidified water glass (AWG) is supposed to have a stronger depressing effect on gangue at lower dosages than alkaline water glass (Fuerstenau et al, 1968;Yang et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Acidified water glass in the selective flotation of scheelite from calcite, part II: species in solution and related mechanism of the depressant

Kupka¹,

Kaden²,

Jantschke³

et al. 2020

Physicochem. Probl. Miner. Process.

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Sodium silicate is one of the main depressants against calcite and fluorite in the scheelite flotation industry. In the first part of this article, the authors acidified sodium silicate (AWG) with three acids (sulfuric, oxalic and hydrochloric) to improve its performance. Results showed that acidified water glass outperforms alkaline water glass in terms of selectivity: it increases mainly the grade by further depressing silicates and calcium-bearing minerals. In most cases, AWG requires lower dosages to do so. The effect of acidified water glass is evaluated through Mineral Liberation Analysis (MLA), froth analysis, Raman and Nuclear Magnetic Resonance (NMR) spectroscopy in order to hypothesize its mechanism. MLA shows that AWG affects silicates and sulfides more intensely than semi-soluble salttype minerals. Froth observations indicate other species in solution associated to the acid having an impact on the flotation results. Raman spectroscopy and NMR measurements indicate that the solution undergoes deep depolymerization when water glass is acidified. Lower molecular weight silica species, specifically Si-O monomers such as SiO(OH)3-will be responsible for the depression of the gangue minerals and are the drivers of the selectivity of AWG, more than orthosilicic acid. Depolymerization is more or less effective depending on the mass ratio of the acid to water glass and depending on the acid.

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“…Sodium silicate is commonly used in scheelite flotation to depress calcium-bearing gangue minerals and silicate minerals; however, the selectivity of sodium silicate for scheelite flotation is inadequate, whereby the floatability of scheelite is somewhat reduced [7][8][9]. Modification of sodium silicate with polyvalent metal ions, oxalic acid, sulfuric acid, ammonium salt, and some other reagents has been proven to be effective in enhancing the depression of gangue minerals with little effect on the desired minerals [7,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Selective Separation of Scheelite from Calcite by Self-Assembly of H2SiO3 Polymer Using Al3+ in Pb-BHA Flotation

Wei

Han

et al. 2019

Minerals

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The flotation separation of scheelite from calcite is problematic, where sodium silicate modified by polyvalent metal ions has shown some advantages for selective depression. In this study, an Al-Na2SiO3 polymer was used as the depressant for the flotation separation of scheelite from calcite using a lead complex of benzohydroxamic acid (Pb-BHA) as the collector. Furthermore, a number of measurements were conducted to investigate the structure of the Al-Na2SiO3 polymer and its adsorption behavior with Pb-BHA complexes on the mineral surface. Flotation experiments indicated that the Al-Na2SiO3 polymer shows good selectivity for the flotation separation of scheelite from calcite at pH 8, where the optimum ratio of sodium silicate to aluminum sulfate was 2:1. Fourier-Transform Infrared (FTIR) and solution chemical analyses revealed that aluminum hydroxide complexes and the hydroxy moiety of silicic acid are able to self-assemble via condensation affording an Al-Na2SiO3 polymer, i.e., a composite aluminosilicate polymer. The zeta potential measurements and adsorption capacity measurements indicated that, upon adsorption of the Al-Na2SiO3 polymer and Pb-BHA complexes on the mineral surface, the Al-Na2SiO3 polymer had less influence on the adsorption of Pb-BHA complexes on the scheelite surface, while the opposite was true for calcite. Therefore, more Pb-BHA complexes and fewer Al-Na2SiO3 polymers were deposited on the scheelite surface, while fewer Pb-BHA complexes and more Al-Na2SiO3 polymers were adsorbed on the calcite surface. The selective separation of scheelite from calcite was attributed to the cooperative selectivity of the Pb-BHA complexes and Al-Na2SiO3 polymer.

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Selective flotation of ilmenite from olivine using the acidified water glass as depressant

Cited by 54 publications

References 20 publications

The Performance and Adsorption Mechanism of a Novel Collector, Dodecyl Dimethyl Betaine (BS-12), for the Flotation Separation of Ilmenite and Titanaugite

The Performance and Adsorption Mechanism of a Novel Collector, Dodecyl Dimethyl Betaine (BS-12), for the Flotation Separation of Ilmenite and Titanaugite

Acidified water glass in the selective flotation of scheelite from calcite, part II: species in solution and related mechanism of the depressant

Selective Separation of Scheelite from Calcite by Self-Assembly of H2SiO3 Polymer Using Al3+ in Pb-BHA Flotation

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