Cost-efficient clean flotation of amorphous graphite using water-in-oil kerosene emulsion as a novel collector

Qiu, Yangshuai; Mao, Zhenfei; Zhang, Lingyan; Luo, Yuan; Qian, Yupeng; Lei, Tao

doi:10.1016/j.apt.2022.103770

Cited by 14 publications

(2 citation statements)

References 48 publications

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“…Natural graphite, as one of the critical raw materials, can be classified into microcrystalline/aphanitic (amorphous) and crystalline (flake) based on crystallinity as well as grain (flake) size and shape. , The grade of flake graphite is generally lower, and its washability is higher than other types, such as dense crystalline graphite and microcrystalline graphite. By increasing the demand for flake graphite, the beneficiation of fine and ultrafine graphite ores (fine flake and aphanitic graphite) has been widely considered. − Flotation and chemical purification (leaching) are the main processes for upgrading graphite and its ash removal. , Prior to chemical purification, flotation separation is commonly used for the preliminary enrichment of raw graphite ore with the highest amount of graphite, ∼95% …”

Section: Introductionmentioning

confidence: 99%

Ultrasound Pretreatment for Enhancing Fine and Ultrafine Flake Graphite Flotation Beneficiation

Tong,

Lu,

et al. 2024

ACS Omega

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With the severe depletion of coarse flake graphite (a critical raw material) resources, developing and utilizing fine and ultrafine graphite resources have recently attracted attention. Froth flotation is a widely used technique for the initial enrichment of graphite; however, the flotation selectivity decreases significantly along with particle size reduction. Ultrasound pretreatment would be a promising method to improve the flotation of fine particles. As an innovative approach to understand better the flotation response of different flake graphite sizes, this study conducted a comparative analysis based on flotation concentrate yield and ash as well as ash removal rate between the flake graphite with various particle sizes after ultrasound pretreatment. Particle size, X-ray powder diffraction, and scanning electron microscopy and energy dispersive X-ray spectroscopy analyses were used to investigate the effect of ultrasound treatment on mineralogical properties of the flake graphite with varied particle sizes. Process outcomes indicated that the flotation performance of fine flake graphite (mean chord length: 62.63 μm) was significantly enhanced after ultrasound pretreatment. However, flotation of the ultrafine flake graphite (mean chord length: 24.97 μm) after ultrasound treatment was limited due to the difficulty of generating sufficient fragmentation and dissociation by microjets and shock waves formed by the cavitation effect. Compared with conventional flotation, the concentrate yield of ultrasound flotation increased from 88.95 to 94.98%, ash content decreased from 5.72 to 4.87%, and ash removal rate enhanced from 36.94 to 42.61%. Particle size and mineral property analyses confirmed that further crushing and dissociation of the larger flake graphite after ultrasound pretreatment would be the main factors contributing to improved flotation performance. Additionally, the formation of air flocs in the coarse flake graphite during the ultrasound pretreatment process facilitated the flotation recovery of the crushed graphite particles.

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Section: Introductionmentioning

confidence: 99%

Ultrasound Pretreatment for Enhancing Fine and Ultrafine Flake Graphite Flotation Beneficiation

Tong,

Lu,

et al. 2024

ACS Omega

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“…Such methods as coagulation [12,13], flocculation [14,15], flotation [16,17], sorption [18], electromagnetic separation [19,20] can be used to solve the problem of wastewater treatment from oil pollution. Currently, membrane separation methods (ultrafiltration, reverse and direct osmosis) are the most promising for the purification of water-oil emulsions, due to their high energy efficiency, selectivity, and economy [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Poly(Ethylene Terephthalate) Track-Etched Membranes for the Separation of Water-Oil Emulsions

Yeszhanov¹,

Korolkov²,

Shakayeva³

et al. 2023

Eurasian J. Chem.

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Rapid industrial growth in the petrochemical, pharmaceutical, metallurgical and food industries, as well as stormwater that accumulates pollution from the roadway and the territories of motor transport enterprises, gas stations, car washes and other municipal services have led to the formation of a large amount of oily wastewater. Oil-containing wastewater is a multicomponent, multiphase water system and, as a rule, is in a state stabilized by various factors, which greatly complicates their processing. Pollution of water sources with oil-containing compounds leads to negative consequences for both living organisms and human health. Therefore, the need to treat oily wastewater is an urgent problem. In this article, poly(ethylene terephthalate) track-etched membranes (PET TeMs) with pore diameters of ~ 5.1 μm and pore density of 1∙106 pore/cm2 were modified by formation of polyelectrolyte complexes of PET TeMs surface with poly(allylamine) (PAAm) and tested for oil-water separation by using hexadecane/water (at pH=2) and chloroform/water (at pH=2) emulsions. Fourier-transform infrared (FTIR) spectroscopy, scanning electron microscope (SEM), en-ergy dispersive X-ray (EDX) analysis, contact angle measurements were used for membrane characterization. The efficiency of oil-water separation was evaluated by flux measurements. Results showed separation per-formance of 267 mL/m2·s for hexadecane/water (pH=2) and 100 mL/m2·s for chloroform/water (pH=2) at vacuum pressure of 700 mbar.

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Flotation Purification of Spent Anode Slag with Water-Soluble Kerosene: A Comparative Study

Wang,

Wei,

Kong

2024

Mining, Metallurgy & Exploration

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Cost-efficient clean flotation of amorphous graphite using water-in-oil kerosene emulsion as a novel collector

Cited by 14 publications

References 48 publications

Ultrasound Pretreatment for Enhancing Fine and Ultrafine Flake Graphite Flotation Beneficiation

Ultrasound Pretreatment for Enhancing Fine and Ultrafine Flake Graphite Flotation Beneficiation

Preparation of Poly(Ethylene Terephthalate) Track-Etched Membranes for the Separation of Water-Oil Emulsions

Flotation Purification of Spent Anode Slag with Water-Soluble Kerosene: A Comparative Study

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