Synergistic effects of Triton X-100 and kerosene on the flotation removal of unburned carbon from fly ash

Zheng, Kanghao; Xia, Wencheng; Wang, Rongrui; Li, Yijiang; Zhang, Wenjun

doi:10.1016/j.colsurfa.2021.126668

Cited by 14 publications

(3 citation statements)

References 29 publications

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“…The difference in chemical structure means that the surface groups are necessarily different in each maceral group. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) are commonly used to study the surface structure of coal (Xia et al, 2018;Li et al, 2021;Zheng et al, 2021). Chen et al (2012) indicated that liptinite has the lowest aromaticity and the longest aliphatic chains with the least amount of branching, while inertinite shows the highest aromaticity and degree of condensation of aromatics by using FTIR (Fig.…”

Section: Surface Propertiesmentioning

confidence: 99%

Role of maceral groups in coal beneficiation: A short review

Ping,

Liu,

Xia

et al. 2024

Physicochem. Probl. Miner. Process.

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Macerals are the basic constituents of coal that can be distinguished and identified under the microscope. Depending on the difference in optical properties, the macerals are divided into four maceral groups, including liptinite, vitrinite, huminite and inertinite. These maceral groups not only affect coal mining and utilization but also play different roles in coal beneficiation. According to the different properties of maceral groups, they can be separated (or enriched) to provide high-quality raw materials for the coal industry. This review briefly introduces the international maceral classification system and reviews in detail the role of maceral groups in coal beneficiation combined with their properties.

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Section: Surface Propertiesmentioning

confidence: 99%

Role of maceral groups in coal beneficiation: A short review

Ping,

Liu,

Xia

et al. 2024

Physicochem. Probl. Miner. Process.

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“…Therefore, removing unburned carbon from fly ash is an important method for increasing the quality of fly ash and utilizing it . There are several technologies for reducing the LOI value of fly ash, such as fluidized bed reactors, oil agglomeration, , electrostatic separation, – and froth flotation. – Flotation is one of the most promising methods for removing unburned carbon from fly ash with high efficiency, effectiveness, and easy commercialization. , Some studies carried out for the removal of unburned carbon from fly ash by flotation are summarized in Table , which shows that the LOI value for different kinds of fly ash can be obviously decreased by flotation and meets the industrial standard. However, when considering the LOI of fly ash as the kernel problem, the recovery of unburned carbon and the quality of carbon concentrate were often neglected.…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that unburned carbon collected from fly ash can be used as raw materials for auxiliary fuel, adsorption materials, metallurgical coke, activated carbon, , graphite substrate, , etc. Many studies have been carried out to improve the carbon recovery in fly ash floatation, such as optimizing the flotation reagent, , ultrasonic pretreatment, collector emulsification, strong mixing, conditioning slurry with saline water , or surfactant, , using a novel bubble generator or a original flotation column, multistage separation, etc. These above-mentioned technologies work well in improving the unburned carbon recovery and reducing the flotation cost, but the tricky problem of high ash content in the carbon concentrate is not solved; moreover, the LOI value of cleaned ash was not paid the required attention.…”

Section: Introductionmentioning

confidence: 99%

Facile Route for Effective Separation and Full-Scale Recycling of Fly Ash and Unburned Carbon

Duan,

Zhang,

Cao

et al. 2024

ACS Omega

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The synchronous production of high-quality unburned carbon concentrate and cleaned ash from high LOI (loss on ignition) fly ash without yielding secondary solid waste is a dilemma issue. In this study, a viable flotation process with one rougher and two cleaners is developed for simultaneously obtaining carbon concentrate with a yield of 18.00% and an ash content of 17.49% and cleaned ash with a yield of 82.00% and a LOI of 4.63% from fly ash, reaching 84.72% of combustible substance recovery and 80.66% of flotation perfection index. The characteristic analyses of the stage by stage releasing products using laser particle size analysis, XRF, XRD, and SEM−EDS demonstrate that the inevitable factors that lead to a remaining higher ash content in the one-step flotation carbon concentrate are the random entrainment of mineral particles in the size range of 0−20 μm, especially the quasi-colloidal parts within 0−12.5 μm and the weak selective collection of fine-grained conjoined granules in the size range of 0−40 μm. Consequently, at least two cleaning steps are required for the effective separation of unburned carbon and ash. Furthermore, batch flotation test results show that diesel is superior to kerosene in the collection of unburned carbon, with an optimum dosage of 800 g/t; no. 2 oil acts more positively than MIBC for the separation of unburned carbon and ash, with an optimal dosing amount of 600 g/t; the optimum pulp concentration and flotation time are as follows: 100 g/L and 3.5 min for the rougher, 45 g/L and 2 min for the first cleaning, and 30 g/L and 3 min for the second cleaning. This study provides an economically feasible technological solution for the full-scale recovery of high-LOI fly ash in one step and avoids the problem of secondary solid waste that would have been generated in previous studies.

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