Utilization of waste cooking oil for highly efficient recovery of unburned carbon from coal fly ash

Yang, Zili; Chang, Guohui; Xia, Yangchao; He, Qi; Zeng, Hongbo; Xing, Yaowen; Gui, Xiahui

doi:10.1016/j.jclepro.2020.124547

Cited by 28 publications

(8 citation statements)

References 27 publications

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“…The chemical profile of 1030# collector is characterized by a highly diverse composition, consisting predominantly of fatty acids and acids, with trans-methyl oleate as the most abundant constituent at 40.22% relative content. In contrast, diesel is primarily composed of alkanes, cycloalkanes and aromatic compounds, as reported by Yang et al [33]. Fatty acids contain a lot of oxygen-containing groups, and the oxygen-containing groups can form hydrogen bonds with the hydrophilic sites on the surface of low-rank coal, effectively promoting the dispersion of the reagent and the interaction with the coal surface, so as to improve the hydrophobicity of coal particles and increase the flotation recovery, as noted by Xia and Wen et al [18,37].…”

Section: Gc-ms Results Of Homemade Vegetable Oil 1030#mentioning

confidence: 81%

“…The absorption peak near 3695 cm −1 and 3602 cm −1 also decreased slightly, corresponding to the hydroxyl group (OH) absorption peak, although the change was insignificant. The aliphatic methyl (-CH3) and methylene (-CH2) at approximately 2918 cm −1 and 2846 cm −1 , respectively, did not exhibit a discernible trend [33,38]. These results suggest that the two collectors had comparable shielding effects on these functional groups.…”

Section: Ftir Resultsmentioning

confidence: 85%

“…Consequently, low-rank coal is characterized by a well-developed porous structure. During the flotation process, capillary pressure attracts flotation agents to penetrate the pores of the coal sample, thereby affecting the spreading of the agents on the sample surface and resulting in excessive consumption [32,33]. The low-rank coal samples used in this paper were relatively uniform without grinding treatment, so the influence of surface roughness changes on flotation can be ignored [34][35][36].…”

Section: Surface Morphology Of Raw Coalmentioning

confidence: 99%

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Enhancing Flotation Performance of Low-Rank Coal Using Environment-Friendly Vegetable Oil

Xu,

Zhou,

Hao

et al. 2023

Minerals

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Flotation is widely used for low-rank coal upgrading, although it is always inefficient due to its rough surface morphology and rich oxygen-containing functional groups. In this study, the environment-friendly vegetable oil 1030# was used to enhance the flotation performance of low-rank coal. The mechanism of 1030# enhancing the flotation of low-rank coal was revealed through surface property analysis of coal particles and bubble–particle adhesion tests. The flotation results showed that the flotation yield of low-rank coal increased with the increase in the collector dosage, and the flotation yield of 1030# as a collector is obviously higher than that of diesel. Scanning electron microscopy (SEM) and chromatography–mass spectrometry (GC-MS) were used to analyze the surface morphology of coal particles and components of the reagent. The SEM results showed that the surface of low-rank coal is loose and contains a large number of pores and cracks, which is not conducive to the spreading of chemicals on the coal surface and the mineralization of bubbles and particles. GC-MS results showed that 1030# mainly contained methyl oleate with more unsaturated double bonds than diesel. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to analyze the surface functional groups of the low-rank coal before and after reagent treatment. The results of FTIR and XPS showed that the coal surface of low-rank coal before reagent treatment contained a large number of oxygen-containing functional groups with poor surface hydrophobicity, while the surface of low-rank coal after reagent treatment had reduced oxygen-containing functional groups and increased hydrophobicity. The contact angle of the low-rank coal surface also showed the same variation trend as the FTIR and XPS results. The adhesion force between the bubble and coal surface in different collector solutions was measured. The maximum adhesion between the bubble and coal surface increased with the increase in the collector, and the maximum adhesion force with 1030# treatment was higher than that of diesel. This indicated that 1030# with a large number of polar components is more easily spread on the surface of low-rank coal, thus improving the hydrophobicity of low-rank coal.

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Section: Gc-ms Results Of Homemade Vegetable Oil 1030#mentioning

confidence: 81%

Section: Ftir Resultsmentioning

confidence: 85%

Section: Surface Morphology Of Raw Coalmentioning

confidence: 99%

See 1 more Smart Citation

Enhancing Flotation Performance of Low-Rank Coal Using Environment-Friendly Vegetable Oil

Xu,

Zhou,

Hao

et al. 2023

Minerals

Self Cite

View full text Add to dashboard Cite

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“…Fly ash is still a problem in many countries due to the dependence on coal energy. Based on statistical data, the total production of fly ash globally is 1,200 MT (Yang et al, 2021). In Indonesia, according to the 2020 energy mix, coal fuel consumption dominates at 38%.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Fly Ash Waste in the Cement Industry and its Environmental Impact: A Review

Permatasari,

Sodri,

Gustina

2023

jppipa, pendidikan ipa, fisika, biologi, kimia

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The cement industry is one of the most important industries in the development of a country. However, the production activities of the cement industry also cause significant environmental impacts, one of which is air pollution. One of the by-products of fuel combustion in the cement industry is fly ash, which if not managed properly can pollute the air and the surrounding environment. This research aims to provide an overview of the environmental impacts of using fly ash in the cement industry, especially in relation to air pollution. This research uses the literature review method, which is by collecting and reviewing literature or documents related to the research topic. The data sources used in this research are scientific journals, books, and other related documents. Data analysis in this study was carried out by reviewing and examining literature or documents related to the research topic, then summarizing and compiling the results of the analysis into an overview. Based on the results of this study, it can be concluded that the use of fly ash in the cement industry has significant environmental impacts, especially related to air pollution. However, there are several technologies and fly ash processing methods that can reduce the environmental impact of cement industry production activities, such as the use of fly ash as raw material for making lightweight concrete or as raw material for the production of other building materials.

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“…According to the FTIR results, WBO mainly consists of C-H, C-O and -OH functional groups, in a good agreement with GC-MS results.From Fig.5, it can be observed that the peak area of -OH and C-O increases obviously and the peak area of C-H increases slightly when the SS and coal was treated by WBO. The reason may be that these oxygen-containing functional groups of WBO can strongly interact with the hydrophilic sites of SS and coal powder surface(Yang et al 2021).…”

mentioning

confidence: 99%

Influence of waste brake oil on the rheological properties of coal sludge slurry

Miao

Jiang

2022

Preprint

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In this work, the effect of waste brake oil (WBO) on the dispersion property of coal oil-sludge slurry (COSS) was investigated and comprehensively analyzed. Apparent viscosity of COSS decreases from 997mPa.s to 276mPa.s with the increasing of SS content from zero to 12% under the CV of 17.70 MJ/kg and O/S of 2.0. The combination of sewage sludge (SS) and WBO could decrease the apparent viscosity of COSS, and SS content and O/S are two important parameters to affect the apparent viscosity. WBO mainly contains the hydrocarbon compound and a lot of oxygenated functional groups according to its GC/MS results. WBO could cover on the surface of SS and coal particle, and reduce their hydrophobic character and the adsorbance amount of dispersant based on the FTIR, XPS and adsorption performance results. In addition, the mechanism of WBO on slurry characteristics of COSS was investigated. With the low content of WBO, the liquid bridges from WBO force the solid particles to adhere together and form a stable network structure, thus reducing the flow ability of the suspension. With the increasing of WBO, the network structures could be broken into cells by stirring it, resulting in a dramatic decrease in viscosity. This research provides a potential way to dispose the SS and waste industry oil.

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Utilization of waste cooking oil for highly efficient recovery of unburned carbon from coal fly ash

Cited by 28 publications

References 27 publications

Enhancing Flotation Performance of Low-Rank Coal Using Environment-Friendly Vegetable Oil

Enhancing Flotation Performance of Low-Rank Coal Using Environment-Friendly Vegetable Oil

Utilization of Fly Ash Waste in the Cement Industry and its Environmental Impact: A Review

Influence of waste brake oil on the rheological properties of coal sludge slurry

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