Separation of Carbon from Fly Ash Using Froth Flotation

Walker, Amanda; Wheelock, T.D.

doi:10.1080/07349340601104883

Cited by 22 publications

(7 citation statements)

References 2 publications

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“…The effects on carbon recovery and composition of the recleaned tailings are also clearly seen in Figures 1 and 2, respectively. Although the effect of collector dosage was anticipated from previous work with other fly ash samples [17,18], the pronounced improvement caused by an increase in agitator conditioning speed was not anticipated. However, an increase in agitator speed would have improved the initial dispersion of particles and collector emulsion and then improved the subsequent rate of contact between particles and emulsion.…”

Section: Resultsmentioning

confidence: 81%

“…In the second phase of the ISU study, an attempt was made to reduce the required amount of collector by adding a frothing agent and by substituting nonylphenol (NP) for DDP in the collector mixture with HEX [18]. Methyl isobutyl carbinol (MIBC) was selected for testing as a frother in a series of flotation tests, and it proved highly effective in reducing the amount of collector required to achieve a large carbon recovery.…”

Section: Introductionmentioning

confidence: 99%

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Process Conditions for the Separation of Carbon from Fly Ash by Froth Flotation

Harris

Wheelock

2008

International Journal of Coal Preparation and Utilization

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The results are presented for the third phase of an extended study of process conditions required for the efficient separation of unburned carbon from fly ash by means of froth flotation. In the previous two phases of this study it was shown that a mixture of nonylphenol (NP) and hexadecane (HEX) is a highly effective collector for the carbon when used with MIBC as a frother. During the third phase of the study, many additional flotation tests were conducted with a conventional, bench-scale, mechanically agitated flotation cell to determine the effects of several important process parameters on flotation system performance. These tests were applied to three additional samples of fly ash from two different sources. The system parameters that had a significant effect on flotation included the carbon content of the fly ash, the agitator speed used for preconditioning the pulp and collector, the collector dosage and its NP content, the MIBC dosage, and the number of flotation stages.

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Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Process Conditions for the Separation of Carbon from Fly Ash by Froth Flotation

Harris

Wheelock

2008

International Journal of Coal Preparation and Utilization

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“…Eisele and Kawatra used froth flotation to remove unburned carbon from fly ash, which reduced the LOI of fly ash from 6-11% to less than 2% [27]. Walker and Wheelock successfully separated unburned carbon and tailings from Class F fly ash by froth flotation, and the recovery of unburned carbon reached above 95% [28]. Zhang and Honaker found that collector dosage and impeller speeds at conditioning were the main factors affecting the carbon recovery for fly ash [23].…”

Section: Introductionmentioning

confidence: 99%

Recovery of Residual Carbon from Ti-Extraction Blast Furnace Slag by Flotation with Simultaneous Dechlorination

et al. 2022

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Ti-extraction blast furnace slag (EBFS) is a secondary slag produced by titanium extraction of titanium-bearing blast furnace slag (TBBFS), which is challenging to be used directly because of its residual carbon and chlorine. This study was performed to recover the residual carbon and remove chlorine from EBFS by froth flotation. The finely ground EBFS (FEBFS) contained graphitized carbon and khamrabaevite and had a 10.19% loss on ignition (LOI) and 5.52% Cl. The graphitized carbon was mainly recovered by flotation rather than khamrabaevite. Graphitized carbon appeared as flakes embedded in or stacked on the surface of the concentrate grains. The irregular-shaped particles were amorphous aluminosilicate glasses, whose presence adversely affected the quality and performance of the flotation concentrate. The Cl contents of the flotation concentrate and tailings obtained under the optimized flotation conditions were significantly reduced to 1.17% and 0.4%, respectively. The dechlorination efficiency reached 71.56%. Meanwhile, the LOI of flotation tailing was reduced to 1.32% and the carbon recovery was 84.79%. Froth flotation could recover residual carbon and remove chlorine from EBFS simultaneously, a novel way to deal with EBFS as a resource and harmless process.

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“…Xu et al [28] studied the mechanism of non-ionic surfactant Triton X-100 (C 34 H 62 O 11 ; its hydrophilic-lipophilic balance (HLB) number is 13.4) pretreatment in enhancing the flotation of fly ash and found that it can significantly improve the hydrophobicity of the unburned carbon surface, thereby increasing the recovery rate of unburned carbon. Walker and Wheelock [29], Harris and Thomas [30] optimized the process conditions required for effective separation of unburned carbon from fly ash by studying parameters such as collectors, pretreatment slurry, and flotation stages in foam flotation.…”

Section: Introductionmentioning

confidence: 99%

The Study of Carbon Recovery from Electrolysis Aluminum Carbon Dust by Froth Flotation

Wang

Hou

et al. 2021

Metals

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A large amount of carbon dust is generated in the process of aluminum smelting by molten salt electrolysis. The carbon dust is solid hazardous waste but contains a large quantity of recyclable components such as carbon and fluoride. How to recycle carbon dust more effectively is a challenge in the aluminum electrolysis field. In this study, X-ray diffraction, scanning electron microscope, and other methods were used to analyze the phase composition of electrolytic aluminum carbon dust. The effects of particle size distribution of carbon dust, impeller speed, reagent addition, mixing time, and flotation time on the flotation recovery of carbon dust were studied. The optimal flotation conditions were obtained and the flotation products were analyzed. The results show that the optimal particle size distribution is 70% of particles below 200 mesh, corresponding to a grinding time of 11 min. The optimum speed of the flotation machine was to be between 1600 and 1800 r/min with the best slurry concentration of 20–30% and 5 min mixing time, and the collector kerosene was suitable for adding in batches. Under the above conditions, the recovered carbon powder with a carbon content of 75.6% was obtained, and the carbon recovery rate was 86.9%.

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Separation of Carbon from Fly Ash Using Froth Flotation

Cited by 22 publications

References 2 publications

Process Conditions for the Separation of Carbon from Fly Ash by Froth Flotation

Process Conditions for the Separation of Carbon from Fly Ash by Froth Flotation

Recovery of Residual Carbon from Ti-Extraction Blast Furnace Slag by Flotation with Simultaneous Dechlorination

The Study of Carbon Recovery from Electrolysis Aluminum Carbon Dust by Froth Flotation

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