Effect of calcium hypochlorite on flotation separation of covellite and pyrite

Yin, Wanzhong; Yang, Bin; Fu, Yanghe; Chu, Fudong; Yao, Jin; Cao, Shun‐an; Zhu, Zhanglei

doi:10.1016/j.powtec.2018.11.048

Cited by 59 publications

(13 citation statements)

References 36 publications

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“…[26] After treated with OA, two new bands at 2922.23 cm À 1 and 2859.54 cm À 1 appeared which were attributed to the symmetrical vibration absorption peaks of -CÀ H in the -CH 2 and -CH 3 moieties. [27] Moreover, the most representa- ChemistryOpen tive characteristic peaks were located at 1543.87 cm À 1 and 1467.36 cm À 1 . The former was attributed to the adsorption peak of C=O asymmetric stretching in -COO À , and the latter was due to the symmetric vibration of -COO À , [28][29] indicating the chemical adsorption of OA on the fluorite surface.…”

Section: Ftir Analysismentioning

confidence: 98%

The Effect of Oleic Acid Emulsification using SPE on Fluorite and Dolomite Flotation**

Wang

Hou

et al. 2021

ChemistryOpen

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Collector OA, oleic acid, is widely used industrially for fluorite flotation. Low selectivity, dispersibility and collecting capability of the OA collector are always observed. In this study, compared with flotation of dolomite, a collector mixture of OA and SPE (styrylphenol polyoxyethylene ether) demonstrated significantly better performances for the fluorite. An optimal mass ratio 4 : 1 OA : SPE was found, and the recovery of fluorite was increased from over 85 % to more than 94 % compared with pure OA. Furthermore, the dosage of the collector agent was reduced from 50 mg mL À 1 to 20 mg mL À 1 , which did not negatively impact the recovery of dolomite. The results from the contact angle tests indicated that SPE selectively increased the surface hydrophobicity of fluorite but had little effect on dolomite. Besides, zeta potential measurements and IR analyses revealed that the addition of SPE led to strong chemical adsorption on the surface of fluorite, resulting in a significant difference in the flotation performances of the two minerals. Therefore, SPEemulsified OA is corroborated to prompt more selectivity and collecting capability on flotation of fluorite over dolomite.

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Section: Ftir Analysismentioning

confidence: 98%

The Effect of Oleic Acid Emulsification using SPE on Fluorite and Dolomite Flotation**

Wang

Hou

et al. 2021

ChemistryOpen

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“…The standard deviation, presented as an error bar, was obtained using the mean of the three measurements per experimental condition. The adsorption of the reagent on the mineral surface was calculated as follows [16,17]:…”

Section: Adsorption Measurementsmentioning

confidence: 99%

Utilization of Ammonium Chloride as a Novel Selective Depressant in Reverse Flotation of Potassium Chloride

Wang

Tian

et al. 2019

Minerals

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The separation of sylvite (KCl) and halite (NaCl), two main minerals in potash ores, is difficult because of the high ion concentration, fine particles of NaCl, and aggregation of KCl and NaCl in the saturated system. This study employed ammonium chloride (NH4Cl) as a new depressant and dodecyl morpholine as a collector in the reverse flotation process. The depressing mechanisms were studied by adsorption capacity experiments, infrared spectral analysis, and molecular dynamics simulations. The flotation tests showed that NaCl recovery increased to 97% after the addition of NH4Cl, while KCl recovery was reduced to <1%. Notably, NH4Cl not only acted as a selective KCl depressant, but also activated NaCl flotation. The FTIR measurements showed that NH4Cl was physically adsorbed onto the KCl and NaCl surfaces. Adsorption capacity experiments and molecular dynamics simulations confirmed more favorable NH4Cl adsorption on the KCl surface than on the NaCl surface. Moreover, the KCl mineral surface was more hydrophilic, while that of NaCl was more hydrophobic. Relative concentration analysis revealed that >90% ammonium and chloride ions were distributed 2–10 Å away from the KCl surface but were dispersed on the NaCl surface, indicating that NH4Cl exhibited stronger intermolecular interactions with KCl than with NaCl.

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“…Pyrite (FeS 2 ) commonly acts as fine gangue mineral during pyrite-chalcopyrite separation in view of its low economic significance and abundance in most copper ores [1][2][3][4]. Traditionally, to reduce sulfur pollution in hydrometallurgy processes through effective pyrite removal, lime was utilized as a cost-effective pulp modifier to alleviate pyrite recovery by forming surface hydrophilic Ca-bearing minerals on pyrite [5][6][7]. Additionally, the surface dissolution of clay minerals such as serpentine, talc, calcite and dolomite also release Ca 2+ and Mg 2+ into flotation systems, which easily form the Ca/Mg hydroxy species/carbonates when pH is over 8 [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Insight on Exogenous Calcium/Magnesium in Weakening Pyrite Floatability with Prolonged Pre-Oxidation: Localized and Concomitant Secondary Minerals and Their Depression Characteristics

et al. 2022

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In this study, we investigated the localized and concomitant precipitation of calcium (Ca)/magnesium (Mg)-bearing species and iron oxides/oxyhydroxides, and their depression characteristics to the pyrite floatability in flotation process at pH 9 and pH 10.5 with prolonged pre-oxidation. Contrary to the depression characteristics at pH 9, the incipient (within aeration times of 30 min) depression of pyrite floatability in Ca/Mg-bearing solutions was more obvious at pH 10.5, while the subsequent decline was only slightly when the pre-oxidation time was expanded to 120 min and 360 min. The competitive adsorption among Ca/Mg-bearing species and potassium amyl xanthate (PAX, C6H11OS2K, collector) at specific sites onto the pyrite surface was demonstrated by the regularly decreased zeta potential of the pyrite surface pretreated in Ca/Mg-bearing solutions. Further scanning electron microscopy-energy dispersive spectrometry demonstrated the concomitant secondary Ca/Mg/Fe-bearing precipitates on the pyrite surface. X-Ray photoelectron spectroscopy suggested strong reprecipitation of iron oxides/oxyhydroxides on the pyrite surface via acid–base complexation among Ca/Mg hydroxy species and iron hydroxy species. Incipient occupation efficiency of specific reaction sites by Ca/Mg-bearing species, which were mainly controlled by the metastable distribution of Ca/Mg hydroxy species and their electrostatic affinity with pyrite surface, was the crucial factor that influenced the competitive adsorption of xanthate and pyrite floatability. More obvious incipient depression at pH 10.5 rather than at pH 9 contributed to more effective Ca/Mg-bearing species and their higher affinity to pyrite surface at pH 10.5. The localized and concomitant precipitation of secondary Ca/Mg/Fe-bearing species leads to a slightly increased hydrophilic coverage upon the pyrite surface, thus a slowly decreased pyrite floatability with increasing pre-oxidation time.

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Effect of calcium hypochlorite on flotation separation of covellite and pyrite

Cited by 59 publications

References 36 publications

The Effect of Oleic Acid Emulsification using SPE on Fluorite and Dolomite Flotation**

The Effect of Oleic Acid Emulsification using SPE on Fluorite and Dolomite Flotation**

Utilization of Ammonium Chloride as a Novel Selective Depressant in Reverse Flotation of Potassium Chloride

Insight on Exogenous Calcium/Magnesium in Weakening Pyrite Floatability with Prolonged Pre-Oxidation: Localized and Concomitant Secondary Minerals and Their Depression Characteristics

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