Effect and mechanism of phosphoric acid in the apatite/dolomite flotation system

Liu, Xing; Ruan, Yaoyang; Li, Chengxiu; Cheng, Renju

doi:10.1016/j.minpro.2017.08.006

Cited by 68 publications

(19 citation statements)

References 16 publications

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“…For apatite, it was positively charged in the pH range of 3-6, which matched well with other literature. The isoelectric point (IEP) of dolomite was near a pH of 6.5, which was also in agreement with the previous study [15,24].…”

Section: Zeta Potential Measurementssupporting

confidence: 92%

“…On the other hand, as calcium-bearing minerals, apatite and dolomite have similar surface properties. Additionally, dissolved components from apatite and dolomite will hydrolyze, precipitate, and adsorb onto the minerals [13][14][15]. All of these factors determine the interfacial properties of the minerals and make it more difficult to separate apatite from dolomite.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Sodium Pyrophosphate on the Reverse Flotation of Dolomite from Apatite

Chen,

Feng,

Zhang

et al. 2018

Minerals

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In this study, the effect of sodium pyrophosphate (NaPP) on the separation of apatite from dolomite by flotation was systematically investigated. Flotation results revealed that NaPP could selectively depress the flotation of apatite, thus realizing the separation of apatite from dolomite. Further, the selective depression mechanism of NaPP was studied through zeta potential measurements, contact angle measurements, and X-ray photoelectron spectroscopy (XPS) analysis. The results demonstrated that the adsorption of sodium oleate (NaOL) onto apatite surface was depressed by the preferential interaction of NaPP with active Ca sites. For dolomite, while the presence of NaPP hindered the interaction of NaOL with active Ca sites, it appeared to enhance the reactivity with active Mg sites. Thus, the adsorption of NaOL onto dolomite surface was hardly influenced. In this way, the separation of apatite from dolomite was achieved.

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Section: Zeta Potential Measurementssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Effect of Sodium Pyrophosphate on the Reverse Flotation of Dolomite from Apatite

Chen,

Feng,

Zhang

et al. 2018

Minerals

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“…9. It shows that fitting peaks of Ca 2p of bare apatite appeared at 347.21 eV and 350.77 eV which derived from the Ca 2p3/2 and Ca 2p1/2 in Ca5(PO4)3OH (Liu., 2017). After reacted with CBC, no new peak appeared, which showed no direct reaction between Ca and CBC.…”

Section: Xps Analysismentioning

confidence: 97%

Effect of N-carboxybutyl chitosan on the flotation separation of apatite from dolomite

Rao¹,

Liu²,

Gao³

et al. 2021

Physicochem. Probl. Miner. Process.

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With high-grade apatite resources exhausted and economic development, enhancing the apatite quality from calcium gangue such as dolomite has a great significance for production. However, it is difficult to separate apatite from dolomite effectively due to the similar surface properties. In this study, the N-carboxybutyl chitosan (CBC) was tested as a potential selective depressant to separate apatite from dolomite in the sodium oleate (NaOL). Flotation results of single mineral and artificially mixed mineral confirmed the selective depression effect of CBC. The depression mechanism of CBC was investigated using wettability analysis, Fourier Transform Infrared (FTIR), and X-ray Photoelectron Spectroscopy (XPS) analyses. The results indicated that the CBC adsorption quantity and intensity on the dolomite surface more than that on the apatite surface, which was due to CBC absorbed on apatite surface by hydrogen bonding, while absorbed on dolomite surface mainly through chemical chelating between Ca on the mineral surface and -COOon the depressant. These adsorption differences led to the flotation separation of the two minerals.

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“…Phosphate ores are raw materials that are important in the phosphorus industry (Liu et al, 2017b). Eighty percent of the global phosphate rock production is derived from sedimentary phosphate deposits (Oelkers et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Reverse flotation of collophanite at natural pH using isooctyl polyoxyethylene ether phosphate as a collector

Li¹,

Zhang²,

Qian³

et al. 2021

Physicochem. Probl. Miner. Process.

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Reverse flotation of collophanite at natural pH could significantly decrease the cost of pH regulators. In this study, isooctyl polyoxyethylene ether phosphate (AEP) was tested as a new surfactant in the reverse flotation of collophanite. Micro-flotation tests were conducted, and the adsorption mechanism of the new collector was analysed using X-ray photoelectron spectroscopy (XPS) and zeta potential analyses. The results of the flotation tests demonstrated that AEP could enable dolomite to float under natural pH (pH=7.2) and showed profound selectivity towards dolomite as opposed to fluorapatite. Based on the zeta potential and XPS results, the adsorption phenomena are mainly attributed to calcium active sites on both mineral surfaces. Dolomite possesses more magnesium active sites than fluorapatite, which tend to reinforce the interaction effect between AEP and dolomite. Furthermore, when compared to CO3 2-ions on the dolomite surface, PO4 3-ions on the fluorapatite surface tend to exhibit a stronger hindrance to the adsorption of AEP on the fluorapatite surface. This is attributed to their larger volumes and more charges on their surfaces, thereby causing a floatability difference between the two minerals.

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Effect and mechanism of phosphoric acid in the apatite/dolomite flotation system

Cited by 68 publications

References 16 publications

Effect of Sodium Pyrophosphate on the Reverse Flotation of Dolomite from Apatite

Effect of Sodium Pyrophosphate on the Reverse Flotation of Dolomite from Apatite

Effect of N-carboxybutyl chitosan on the flotation separation of apatite from dolomite

Reverse flotation of collophanite at natural pH using isooctyl polyoxyethylene ether phosphate as a collector

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