Surface Features of Fluorapatite and Dolomite in the Reverse Flotation Process Using Sulfuric Acid as a Depressor

Zou, Heng; Cao, Qinbo; Liu, Dianwen; Yu, Xingcai; Lai, Hao

doi:10.3390/min9010033

Cited by 21 publications

(11 citation statements)

References 22 publications

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“…The four bands at 3541, 3374, 3268 and 1656 cm −1 are related to the zeolitic and coordinate waters present in the palygorskite structure [ 106 , 119 ]. The characteristic bands of dolomite appear at 1439 and 729 cm −1 , related to the asymmetrical elongation of CO 3 and the vibrations of CO 3 , respectively [ 120 , 121 ]. This result agrees with the XRD pattern and chemical analysis presented above, which confirm the presence of dolomite.…”

Section: Resultsmentioning

confidence: 99%

Adsorption Behavior of Crystal Violet and Congo Red Dyes on Heat-Treated Brazilian Palygorskite: Kinetic, Isothermal and Thermodynamic Studies

et al. 2021

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The effect of heat treatment on the adsorptive capacity of a Brazilian palygorskite to remove the dyes crystal violet (CV) and congo red (CR) was investigated. The natural palygorskite was calcined at different temperatures (300, 500 and 700 °C) for 4 h. Changes in the palygorskite structure were evaluated using X-ray diffraction, X-ray fluorescence, thermogravimetric and differential thermal analysis, N2 adsorption/desorption and Fourier transform infrared spectroscopy. The adsorption efficiency of CV and CR was investigated through the effect of initial concentration, contact time, temperature, pH and dosage of adsorbent. The calcination increased the adsorption capacity of palygorskite, and the greatest adsorption capacity of CV and CR dyes occurred in the sample calcined at 700 °C (Pal-700T). The natural and calcined samples at 300 and 500 °C followed the Freundlich isothermal model, while the Pal-700T followed the Langmuir isothermal model. Adsorption kinetics results were well described by the Elovich model. Pal-700T showed better adsorption performance at basic pH, with removal greater than 98%, for both dyes. Pal-700T proved to be a great candidate for removing cationic and anionic dyes present in water.

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Section: Resultsmentioning

confidence: 99%

Adsorption Behavior of Crystal Violet and Congo Red Dyes on Heat-Treated Brazilian Palygorskite: Kinetic, Isothermal and Thermodynamic Studies

et al. 2021

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“…Magnesium removal by reverse flotation is usually achieved in weak acid solution, and acid inhibitors play a significant role in the selective enhanced separation of apatite and dolomite (Zou et al 2019;Liu et al 2017a;Liu et al 2017b). WFS, a mixed acid mainly composed of sulfuric acid and phosphoric acid, was used as a combination inhibitor to carry out reverse flotation tests of acidic pulp at different pH values, as illustrated in Fig.…”

Section: Effect Of Phmentioning

confidence: 99%

Reverse anionic flotation of dolomitic collophanite using a mixed fatty acid collector: Adsorption behavior and mechanism

Wang¹,

Li²,

Tian³

et al. 2022

Physicochem. Probl. Miner. Process.

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Collophanite in south China generally has a high MgO level, which negatively impacts wetprocess phosphoric acid production and cannot be utilized directly. A novel mixed fatty acid soap (GSWF01) was employed as a collector for dolomite. A single reverse flotation experiment was performed on a dolomitic collophanite from Guizhou, China under different pH and collector dosages. A phosphate concentrate with P2O5 grade of 33.73%, MgO content of 1.07%, MER value (ω(MgO+Al2O3+Fe2O3)/ω(P2O5)) of 4.86% and phosphorus recovery of 91.06% was obtained. The beneficiation indexes of GSWF01 were better than that of sodium oleate (NaOL). The adsorption behavior and mechanism of GSWF01 on dolomite surface were investigated using quartz crystal microbalance with dissipation (QCM-D), atomic force microscope (AFM), infrared spectrometer (IR), and zeta potentiometer. The results revealed that GSWF01 chemically reacted with metal ions (Ca 2+ , Mg 2+ , etc.) on the surface of dolomite to generate fatty acid salt precipitation (chemisorption). The adsorbed layer transitioned from dense to loose in two stages, resulting in a stable double-layer adsorption structure. Moreover, in a weak acidic solution environment, physical adsorption of fatty acid molecules (RCOOH (aq)) and fatty acid ion-molecular association compounds (RCOOH• RCOO − ) generated by hydrolysis can also occur on the dolomite surface. These are the main reasons for the hydrophobic floating of dolomite. This is of great significance to the development of a novel highefficiency dolomite collector and the enhancement of flotation process for carbonate collophanite.

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“…It shows that the apparent viscosity of phosphate rock slurry will not change significantly by changing the pH in the slurry. The reason for this phenomenon may be that sulfuric acid mainly combines with Ca atoms on the surface of apatite in phosphate rock slurry, which hinders the adsorption of collector on the surface of apatite and keeps apatite hydrophilic (Zhang et al, 2020;Zou et al, 2019). However, there are other minerals in the phosphate flotation slurry, which will not have a great impact on the interaction between particles in the slurry.…”

Section: Effect Of Ph On Rheological Properties Of Slurrymentioning

confidence: 99%

Influence of measuring process properties on phosphate rock slurry rheology based on Brookfield method

Chen¹,

Zhang²

2022

Physicochem. Probl. Miner. Process.

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This research aims to explore how the flotation process conditions influence the rheological properties of phosphate rock slurry. The apparent viscosity of phosphate rock slurry was measured by Brookfield DVNext rheometer. Different mineral types, grinding time, slurry mass concentration and reagent systems were adopted to study the viscosity behavior of phosphate rock slurry. The results showed that under the same conditions, the apparent viscosity of apatite and dolomite slurry was basically the same, and the apparent viscosity of the slurry after mixing the two minerals was basically the same as that of single mineral. For the same slurry concentration, the mineral particle size had a significant effect on the rheological behavior of the slurry, and its apparent viscosity increased exponentially with the decrease of particle size. In addition, phosphate rock slurry showed shear thickening fluids characteristics when the slurry concentration is 20%-40%, but changed to pseudoplastic fluid at high concentration (60%). Sulfuric acid as pH regulator and inhibitor had little effect on the rheology of slurry; when GJBW and NaOL were added as collectors, the rheology of slurry changed, and the effect of GJBW was more obvious.

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Surface Features of Fluorapatite and Dolomite in the Reverse Flotation Process Using Sulfuric Acid as a Depressor

Cited by 21 publications

References 22 publications

Adsorption Behavior of Crystal Violet and Congo Red Dyes on Heat-Treated Brazilian Palygorskite: Kinetic, Isothermal and Thermodynamic Studies

Adsorption Behavior of Crystal Violet and Congo Red Dyes on Heat-Treated Brazilian Palygorskite: Kinetic, Isothermal and Thermodynamic Studies

Reverse anionic flotation of dolomitic collophanite using a mixed fatty acid collector: Adsorption behavior and mechanism

Influence of measuring process properties on phosphate rock slurry rheology based on Brookfield method

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