Beneficiation of fluorite by flotation in a new chemical scheme

Zhang, Y; Song, Shaoxian

doi:10.1016/s0892-6875(03)00136-5

Cited by 70 publications

(27 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the main minerals in the fluorite ore are fluorite, calcite, and quartz which have their isoelectric point (IEP) at different pH, the addition of dispersant changes the pH of slurry and endows the minerals with different charges, which are beneficial for the separation of the minerals and getting the high concentrate grade of CaF 2 [13,14]. It can be explained that the existence of potential energy barrier between particles keeps from the approach of particles, which causes the aggregative stability of colloidal suspensions, but the interaction energies of electrical double layer and van der Waals cause the potential energy barrier to arise and the particles with different charge to separate [15][16][17]. Meanwhile, the sample was characterized by the method of EDX in order to analyze the composition of the sample.…”

Section: Fesem-edx Characterizationmentioning

confidence: 99%

The Improvement Effect of Dispersant in Fluorite Flotation: Determination by the Analysis of XRD and FESEM-EDX

Sun

Zhou

et al. 2015

Journal of Spectroscopy

View full text Add to dashboard Cite

Different dispersants were added in the dispersion process to improve the efficiency of fluorite flotation. The types and dosage of dispersant on the improvement of fluorite flotation were investigated; when the sodium polyacrylate (SPA) was used as the dispersant and its addition is 0.5%, the concentrate grade of CaF 2 increased from 90% to 98% and the fluorite recovery increased from 81% to 85%. Methods of X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), and Energy dispersive X-ray spectrometer (EDX) were used to characterize the sample. According to the analysis of results, the optimal sample consisted of CaF 2 and very little CaCO 3 in the size range of 0-5 m. It could be concluded that the mechanism of improvement for the concentrate grade and recovery of CaF 2 was attributed to the change of potential energy barrier which caused the separation of particles with different charge. All results indicate that SPA has a great potential to be an efficient and cost-effective dispersant for the improvement of fluorite flotation.

show abstract

Section: Fesem-edx Characterizationmentioning

confidence: 99%

The Improvement Effect of Dispersant in Fluorite Flotation: Determination by the Analysis of XRD and FESEM-EDX

Sun

Zhou

et al. 2015

Journal of Spectroscopy

View full text Add to dashboard Cite

show abstract

“…Different mechanisms of fatty acid collector adsorption on the mineral surface, including physisorption, chemisorption, surface precipitation, and chemisorptions, followed by surface precipitation and chemisorption, and then followed by the formation of hydrophobic aggregates, have been reported in previous studies [4][5][6][7]. In recent years, a new flotation scheme, involving the mixing of collectors and novel depressants for fluorite beneficiation from other gangue minerals, was reported and achieved satisfactory results [2,8,9]. Natural pure fluorite is colorless and transparent, but in general, natural fluorite exhibits various colors such as yellow, green, pink, blue, purple, and sometimes black, due to different color centers or impurities.…”

Section: Introductionmentioning

confidence: 98%

“…It is mostly used for manufacturing glass, cement, fillers, and hydrofluoric acid, and as a flux in steel-making in various industries [1][2][3]. In order to obtain high grade fluorite raw materials (CaF 2 ≥ 97%), froth flotation has been the most commonly used beneficiation process for fluorite ores, employing fatty acid collectors.…”

Section: Introductionmentioning

confidence: 99%

Flotation Behavior of Different Colored Fluorites Using Sodium Oleate as a Collector

et al. 2017

View full text Add to dashboard Cite

Using sodium oleate (NaOL) as a collector, the flotation characteristics of natural colorless fluorite (CF), green fluorite (GF), and purple fluorite (PF) were investigated through micro-flotation tests, collector adsorption measurements, and surface tension measurement. The micro-flotation results indicated that CF had a much better flotation response than both GF and PF, and had higher floatation recovery. The results demonstrated a considerable discrepancy in the interfacial properties between colorless and colored fluorite, even though all the samples were obtained from the same deposit, holding a similar high purity of CaF 2 . The adsorption capacity of CF, GF, and PF for NaOL was 2.27, 4.18, and 8.21 × 10 −6 mol/g under neutral conditions, respectively. Fourier transform infrared (FT-IR) measurements revealed that the carboxyl groups of NaOL reacted with Ca sites on the surface of fluorites by chemical adsorption. From the zeta potential analyses, PF exhibited a lower positive potential than CF and GF, mainly due to its surface carbonation. In the presence of NaOL, the surface potential of fluorites changed from positive to negative because the NaOL collector had been adsorbed onto the mineral surface and changed their surface potential, which was consistent with the flotation results at different pH values. We found that the floatability of the fluorite samples was influenced by their surface roughness, measured by an atomic force microscope (AFM) and scanning electron microscope (SEM). PF can be floated with adding more reagent dosage than CF and GF to compensate for its higher surface roughness.

show abstract

“…Some fluorite processing plants are located in northern China, which is characterised by long cold winters, necessitating thermal heating of the ore slurry translating to high energy costs. Apart from the proper selection of depressants, high-temperature pulp treatment has also been shown to improve the selectivity in fluorite flotation [2][3][4]. There is therefore a need to come up with customised flowsheets and efficient optimised reagent regimes for improved selectivity and reduced energy costs in fluorite flotation [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

The Role of Gangue Mineralogy on Flowsheet Development in Fluorite Processing

2020

View full text Add to dashboard Cite

Fluorite, CaF2, is considered a strategically important mineral as it is a raw material for many strategic industries. Froth flotation is reported to be the most efficient and economically viable process for the production of an acid-grade product with a CaF2 content of at least 97%. Selective flotation of fluorite from gangue minerals, e.g., calcite and barite, is challenging because these minerals have similar physicochemical properties. This study employed batch flotation tests coupled with mineralogical analysis to design suitable customised flowsheets and efficiently optimised reagent regimes for optimum production of acid-grade fluorite concentrate from two different fluorite ores by the froth flotation process. The effect of pulp temperature on fluorite flotation was investigated in this study with the objective of lowering pulp temperatures in fluorite flotation. The results showed that an acid-grade CaF2 concentrate could be obtained from the flotation of both ores at ambient pulp temperatures. This eliminates the requirement for high-temperature pulp treatment, which would result in a significant reduction in thermal energy costs. This study showed that an understanding of gangue mineralogy is key to process optimisation for acid-grade CaF2 production. Although an acid-grade CaF2 concentrate could be produced from both ores, the flowsheets and reagent regimes were markedly different. For instance, the production of an acid-grade CaF2 product from a high quartz and calcite ore was achieved by employing a simple rougher–multiple cleaner flotation circuit using tannin and sodium silicate as calcite and quartz depressants, respectively. On the other hand, the production of an acid-grade CaF2 product from the flotation of the pyritic ore required a pre-sulphide flotation stage for upfront sulphur removal and the use of a sulphide depressant. Multiple stages of cleaning were required for improved selectivity in the flotation of both ores.

show abstract

Beneficiation of fluorite by flotation in a new chemical scheme

Cited by 70 publications

References 3 publications

The Improvement Effect of Dispersant in Fluorite Flotation: Determination by the Analysis of XRD and FESEM-EDX

The Improvement Effect of Dispersant in Fluorite Flotation: Determination by the Analysis of XRD and FESEM-EDX

Flotation Behavior of Different Colored Fluorites Using Sodium Oleate as a Collector

The Role of Gangue Mineralogy on Flowsheet Development in Fluorite Processing

Contact Info

Product

Resources

About