Preparation of pitch-based activated carbon with surface-treated fly ash for SO2 gas removal

Kim, Min Il; Im, Ji Sun; Seo, Sang Wan; Cho, Jong Hoon; Lee, Young-Seak; Kim, Sangjin

doi:10.1007/s42823-019-00107-y

Cited by 14 publications

(3 citation statements)

References 36 publications

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“…From another point of view, the recycling of unburned carbon is another vital issue for the comprehensive utilization of fly ash. 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.…”

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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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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“…Besides the conventional raw materials, alternate ones have been proposed to produce activated carbons. Here, the most frequently reported precursors for activated carbons are certain polymers 35 – 39 and pitches 40 – 45 , or a wide range of other organic materials 46 – 53 . Numerous reports concern use of these unconventional adsorbents for adsorption of pesticides from water.…”

Section: Introductionmentioning

confidence: 99%

Development of activated carbon for removal of pesticides from water: case study

Zieliński

Miądlicki

Przepiórski

2022

Sci Rep

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The work primarily concerns development of activated carbon dedicated for adsorption of pesticides from water prior directing it to the distribution system. We provide an information on research on important practical aspects related to research carried out to develop and to manufacture activated carbons. The paper concerns preliminary works on selection raw materials, a binder used for producing granulated adsorbent, activating gases, conditions of the production process, and others. The key attention in this research was paid to its target, i.e., industrial process to produce activated carbon revealing fulfilling required properties including satisfying adsorption of selected pesticides and meeting the requirements of companies dealing with a large-scale production of drinking water. Therefore, among others, the work includes considerations concerning such aspects like pore structure and specific surface area of the activated carbon, formation of granules that are the most demanded and thus preferred in an industrial practice form of activated carbons, and other aspects important from practical point of view. Using the results of our preliminary work, a batch of granular activated carbon was produced in industrial conditions. The obtained material was tested in terms of removing several pesticides at a water treatment plant operating on an industrial scale. During tests the concentration of acetochlor ESA was decreased from ca. 0.4 µg/l in raw water to below 0.1 µg/l. During 11 months of AC use specific surface area of adsorbent lowered significantly by 164 m2/g, and total pore volume declined from initial 0.56 cm3/g to 0.455 cm3/g. We discuss both a performance of the obtained activated carbon in a long-term removal of acetochlor and its derivatives from water and an effect of exploitation time on the removal efficiency. The explanations for the reduction in pesticide removal efficiency are also proposed and discussed.

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“…Activated carbon fibers have a high specific surface area and a well-developed pore structure. Therefore, they are widely used as environmental adsorption and energy storage materials [11][12][13]. However, since manufacturing activated carbon fibers requires many steps and high oxidation conditions, it usually entails a high cost.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Activated Carbon Fibers Derived from Linear Low-Density Polyethylene Fibers Stabilized at a Low Temperature

et al. 2021

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In this study, activated carbon fibers (ACFs) were prepared using a new method from polyethylene (PE) fibers. The stabilizing (or crosslinking) process of PE, an essential step, was achieved through a hybrid treatment using electron-beam/sulfuric acid at 110 °C that was more effective than the traditional method of using sulfuric acid at 180 °C for polyolefin. The stabilized precursor was then carbonized at 700 °C and activated at 900 °C with different activation times. The structural characteristics and morphologies of these ACFs were observed using an X-ray diffractometer and a field-emission scanning electron microscope, respectively. In addition, the N2/77K adsorption isotherm was used to discern textural properties. The total pore volume and specific surface area of these ACFs were found to be increased with a longer activation time, reaching final values of 0.99 cm3/g and 1750 m2/g, respectively. These ACFs also exhibited a high mesopore volume ratio (39%) according to crosslinking and crystallite formation conditions.

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Preparation of pitch-based activated carbon with surface-treated fly ash for SO2 gas removal

Cited by 14 publications

References 36 publications

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

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

Development of activated carbon for removal of pesticides from water: case study

Synthesis and Characterization of Activated Carbon Fibers Derived from Linear Low-Density Polyethylene Fibers Stabilized at a Low Temperature

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