Effect of acidified water glass on the flotation separation of scheelite from calcite using mixed cationic/anionic collectors

Dong, Liuyang; Jiao, Fen; Qin, Wenqing; Zhu, Hua; Jia, Wenhao

doi:10.1016/j.apsusc.2018.03.097

Cited by 76 publications

(19 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Selective collectors, such as hydroxamic acids [9], quaternary ammonium salts [10], dodecylamine [11], amino phosphoric acids [12] and mixed collectors [13,14], have been investigated to improve the flotation of scheelite. Effective depressants, such as water glass (sodium silicate, Na 2 O•mSiO 2 •nH 2 O), acidified sodium silicate [15,16], aluminum-sodium silicate polymer [17], phosphates [18], tannins [19], etidronic acid [20] and calcium lignosulphonate [21], are used to enhance the separation of scheelite from calcium-bearing minerals.…”

Section: Introductionmentioning

confidence: 99%

Significant Improvement in the Scheelite Heating Flotation with Sodium Sulfide

et al. 2018

View full text Add to dashboard Cite

An efficiently optimized reagent regime was investigated to improve scheelite heating flotation. The scheelite grade and recovery in the plant were significantly improved by 5% and 6%, respectively, which remarkably augmented the economic profit by $260,000 per month. The interaction mechanisms of sodium sulfide and sodium oleate with scheelite, calcite and fluorite were evaluated by adsorption amount and Fourier transform infrared (FTIR) analyses. Sodium sulfide exhibited an excellent ability to promote the adsorption and desorption of sodium oleate on the scheelite surface and from the calcite and fluorite surfaces, thus facilitating the separation of scheelite from fluorite and calcite.

show abstract

Section: Introductionmentioning

confidence: 99%

Significant Improvement in the Scheelite Heating Flotation with Sodium Sulfide

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Based on Equations (5)- (8), the distribution of the hydrolysis species of aluminum ions at an initial concentration of 1 × 10 −4 mol/L was calculated and plotted in Figure 7. In aqueous solution, Al 3+ and mononuclear aluminum hydroxide complexes Al(OH) 2+ and Al(OH)2 + are predominant over the pH range of 3-6, while Al(OH)3(aq) species prevail across the pH range of 6-9 and Al(OH)4 − predominates at pH > 9.…”

Section: Self-assembly Of Sodium Silicate and Aluminum Ions In Solutionmentioning

confidence: 99%

“…Based on Equations (5)- (8), the distribution of the hydrolysis species of aluminum ions at an initial concentration of 1 × 10 −4 mol/L was calculated and plotted in Figure 7. In aqueous solution, Al 3+ and mononuclear aluminum hydroxide complexes Al(OH) 2+ When aluminum ions are added to a solution of sodium silicate, a dehydration condensation reaction occurs between the aluminum hydroxide complexes and the hydroxy moiety of silicic acid or polysilicic acid, forming a new composite aluminosilicate polymer [40][41][42].…”

Section: Self-assembly Of Sodium Silicate and Aluminum Ions In Solutionmentioning

confidence: 99%

“…Compared to Na 2 SiO 3 , Al-Na 2 SiO 3 adsorbs to a larger extent on the calcite surface than on scheelite [19]; therefore, the Al-Na 2 SiO 3 polymer will also present a different influence on the adsorption of Pb-BHA complexes on the scheelite and calcite surfaces. The isoelectric point (IEP) of scheelite and calcite is circa 1.3 and 9.6, respectively; therefore, in the pH range of 7-9, the scheelite particles are negatively charged but calcite is always positively charged [8,[43][44][45]. Figure 12 shows the zeta potential of scheelite and calcite at different concentrations of Pb-BHA after treatment with Na 2 SiO 3 and the Al-Na 2 SiO 3 polymer.…”

Section: Zeta Potential Measurementsmentioning

confidence: 99%

“…The flotation separation of scheelite from other calcium-containing minerals is problematic due to their similar physicochemical characteristics and flotation behavior [1][2][3][4][5][6]. 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%

See 2 more Smart Citations

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

Wei

Han

et al. 2019

Minerals

View full text Add to dashboard Cite

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.

show abstract