Effects of Flotation Reagents on Flotation Kinetics of Aphanitic (Microcrystalline) Graphite

Hu, Xinnan; Tong, Zheng; Sha, Jiahao; Bilal, Muhammad; Sun, Yujin; Gu, Rui; Ni, Chao; Li, Chaoqun; Deng, Yumeng

doi:10.3390/separations9120416

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…When the dosage of sodium metasilicate was increased, the Zeta potential on the particle surface changed, and the particle surface's Zeta potential electronegativity increased, which suggests that sodium metasilicate was becoming more and more adsorbent on the surface of minerals. For the surface of the graphite particles to thoroughly touch the collector, the dispersion of impurity minerals and their reduction in adsorption on the surface of the graphite particles both benefit from the proper quantity of sodium metasilicate (Hu et al, 2022). To optimize flotation, it improves the hydrophobic difference between graphite particles and contaminant minerals.…”

Section: Analyses Of Zeta Potential Measurement Resultsmentioning

confidence: 99%

Study on Improving Flotation Effect and Mechanism of Fine Anthracite by Polyacrylamide, Sodium Silicate and Sodium Oleate

Rahman

Dong

2023

ejtas

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The flotation performance of clean coal with different reagents and pretreatment agents was investigated. The study examines the efficient recovery of anthracite coal using polyacrylamide flotation pretreatment. The mechanism of pretreatment agents and anthracite was investigated using Fourier transform infrared spectroscopy (FTIR), zeta potential measurements and focused beam reflectance measurement (FBRM). The wetting behavior and flotation performance of anthracite and pretreatment agents were investigated using contact angle measurements and series of flotation tests. The coal samples were treated with reagents like kerosene, sec-octanol and pretreatment agents like polyacrylamides, (cat-ionic polyacrylamide, non-ionic polyacrylamide, an-ionic polyacrylamide), sodium silicate and sodium oleate to investigate their impact on coal surface properties and the subsequent flotation performance. The optimum dosage of kerosene was found to be 10 kg/t and that of sec-octanol was 1.84 kg/t. Moreover, the optimum dosages of cat-ionic polyacrylamide, sodium oleate and sodium silicate were 200 g/t, 350 g/t and 500 g/t respectively. The yield of clean coal of cat-ionic polyacrylamide was 70.70 %, ash content of clean coal of cat-ionic polyacrylamide was 11 %. The sodium silicate (Na2SiO3) has the yield of 66.66 % and the ash content of 13.9 %. The results indicated that the cat-ionic polyacrylamide demonstrated the most substantial improvement in flotation performance, particularly when used in conjunction with kerosene and sec-octanol.

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Section: Analyses Of Zeta Potential Measurement Resultsmentioning

confidence: 99%

Study on Improving Flotation Effect and Mechanism of Fine Anthracite by Polyacrylamide, Sodium Silicate and Sodium Oleate

Rahman

Dong

2023

ejtas

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“…Even the retention time of fotation is extended indefnitely, and it is unlikely that the recovery of hard foating particles with weak hydrophobicity will be 100%. Figure 14 shows the plots of experimental data ftted by the two kinetic models occurred at diferent fotation time intervals, pertaining to the actual fotation yields [54,[68][69][70]. Te parameters of the kinetic models are summarized in Table 3.…”

Section: Flotation Kineticsmentioning

confidence: 99%

Effective Removal of Ibuprofen from Aqueous Solution Using Cationic Surface-Active Agents in Dissolved Air-Flotation Process

Pooja,

Senthil Kumar,

Chitra

et al. 2024

International Journal of Chemical Engineering

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This research paper focuses on the removal of the nonsteroidal anti-inflammatory drug, ibuprofen, from an aqueous solution using a dissolved air flotation process. The comparison of different types of cationic surface-active agents such as cetyltrimethyl ammonium bromide (CTAB), tetrabutyl ammonium bromide (TBAB), and octyltrimethyl ammonium bromide (OTAB) have been employed to scrutinize the effective removal of the ecotoxic pharmaceutically active compound. The work included the influencing parameters such as pressure, contact time, surfactant dosage, pH, flow rate, and initial concentration owing to the best-optimized conditions. The maximum removal rate of 96.09% was achieved at 15 min for CTAB, TBAB had 62.36% at 45 min, and 89.6% was obtained for OTAB at 30 min, with 50 mg L−1 as the initial concentration and pH = 4. The removal rate was better with the optimized dosage of CTAB at 0.6 g, TBAB at 1.2 g, and OTAB at 1.0 g. It was observed that the geometric shape of the surface-active agents had greater impacts on the contaminants’ efficiency. CTAB and OTAB were combined to find out the best possible removal rate of contaminants. The synergistic effect augments surfactant-based occurrence to be better in forming a good foaming effect and tends to have a lower critical micelle concentration (CMC). From the evaluation of kinetic models, pseudo-second-order flotation kinetics fitted the experimental data best. Furthermore, the formed metabolites that had been identified using gas chromatography-mass spectrometry were found to be less toxic than the parenting compounds.

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“…The coal flotation process is a complex and dynamic process that involves various physicochemical aspects, and its final outcome is influenced by multiple factors, such as feed mineral properties, concentration, process flow, equipment performance, and agent regime [1][2][3][4][5][6]. The use of flotation agents can significantly modify the nature of the solidliquid-gas phase of the system, thereby improving the hydrophobicity of fine-grained coal and enhancing the flotation effect [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Na+ on the Adsorption Behavior of Polystyrene Nanoparticles onto Coal and Quartz Surfaces

et al. 2023

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The recovery of difficult-to-float coal using traditional nonpolar hydrocarbon oil collectors can be challenging, particularly for low-rank or oxidized coal. Thus, there is a need for more efficient flotation agents. Nanoparticle flotation collector technology has become increasingly popular in the field of mineral processing, and the presence of various ions in the slurry can significantly affect the interaction between collectors and mineral surfaces. In this study, cationic polystyrene (PS) nanoparticles were prepared using an emulsion polymerization method, and the effects of Na+ ion concentration on the in situ adsorption and desorption processes, adsorption layer configuration, and adsorption kinetics of PS particles on amorphous carbon (coal model) and SiO2 sensors (quartz mineral model) were analyzed using the quartz crystal microbalance with dissipation (QCM-D) technique. Our results showed that the hydrophobic PS nanoparticles irreversibly adsorbed onto both amorphous carbon and SiO2 sensors under different environmental conditions, and their adsorption capacity decreased gradually with increasing Na+ ion concentration. Increasing Na+ ion concentration from 0 M to 1.0 M resulted in a 24.4% and 30.9% decrease in equilibrium adsorption capacities of PS nanoparticles onto amorphous carbon and SiO2 surfaces, respectively. The adsorption rate of PS nanoparticles onto the SiO2 surface was much greater than that on the amorphous carbon surface. The adsorption rate constant of PS nanoparticles onto SiO2 surfaces was 0.782 at 0.1 M Na+ ion concentration, while its adsorption rate constant onto amorphous carbon surfaces was only 0.060. Moreover, the adsorption process was found to be more in line with the quasi-primary kinetic model. These findings suggest that PS nanoparticles may serve as promising flotation collectors for the recovery of difficult-to-float coal, and highlight the importance of considering the effect of dissolved ions on the adsorption properties of flotation collectors.

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Effects of Flotation Reagents on Flotation Kinetics of Aphanitic (Microcrystalline) Graphite

Cited by 8 publications

References 30 publications

Study on Improving Flotation Effect and Mechanism of Fine Anthracite by Polyacrylamide, Sodium Silicate and Sodium Oleate

Study on Improving Flotation Effect and Mechanism of Fine Anthracite by Polyacrylamide, Sodium Silicate and Sodium Oleate

Effective Removal of Ibuprofen from Aqueous Solution Using Cationic Surface-Active Agents in Dissolved Air-Flotation Process

Effect of Na+ on the Adsorption Behavior of Polystyrene Nanoparticles onto Coal and Quartz Surfaces

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