Flotation characteristics of oxidized coal slimes within low-rank metamorphic

Cai, Yuchu; Du, Meili; Wang, Shuili; Liu, Lei

doi:10.1016/j.powtec.2018.09.006

Cited by 24 publications

(7 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cai et al’s study shows that in the pulp environment (the oxygen content in the pulp is much lower than that in the air), the coal will hardly be oxidized in a short time. Therefore, it can be considered that the oxygen content of raw coal does not change with temperature during 120 s of pulping time . At different temperatures, the oxygen content on the surface of coal after the action of diesel oil is shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, it can be considered that the oxygen content of raw coal does not change with temperature during 120 s of pulping time. 64 At different temperatures, the oxygen content on the surface of coal after the action of diesel oil is shown in Figure 9 . The surface oxygen contents of coals treated with diesel all are lower than that of raw coal.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

New Insight into Temperature Effects on Low-Rank Coal Flotation Using Diesel as a Collector

et al. 2023

View full text Add to dashboard Cite

Efficient flotation of low-rank coal is of great significance for the development of green and low-carbon cycles. Temperature is a crucial parameter of flotation, but the mechanism of its effect on flotation lacks understanding. In this paper, the mechanism was studied by kinetic flotation, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, low-temperature liquid-nitrogen adsorption (LP-N 2 A), X-ray photoelectron spectroscopy (XPS), and molecular dynamics simulation. The flotation combustible recovery gradually decreases as temperature rises. Compared with 60 °C, the combustible recovery at 5 °C increases by 18.13%. The desorption energy for oil droplets decreases as the temperature rises. As a result, the oil droplets are easier to desorb at high temperatures. The SEM and LP-N 2 A results demonstrate that the pores and fractures of the coal sample are well developed. Also, the oil−water interfacial tension and viscosity of oil droplets decrease as the temperature rises, while the diffusion ability increases. These increase the volume of oil droplets that penetrate into the pores, resulting in poor spreadability of oil droplets on the coal surface. The average volume of bubbles gradually increases as temperature rises, which renders the flotation foam unstable and worsens the flotation. Therefore, the flotation performance is better at low temperatures.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

New Insight into Temperature Effects on Low-Rank Coal Flotation Using Diesel as a Collector

et al. 2023

View full text Add to dashboard Cite

show abstract

“…As shown in Fig. 2, several absorption band for LRC/CC samples include: -OH stretching frequency around 3693cm -1 , 3618cm -1 , and 3414 cm -1 (He et al, 2018;Li et al, 2020c;Aljerf and Nadra, 2019;Fan et al, 2020); -CH stretching frequency at 3041 cm -1 , 2922 cm -1 , 2855 cm -1 (Li et al, 2020c;Zhu et al, 2019); -COOstretching frequency at 1735 cm -1 , 914 cm -1 (He et al, 2018;Zhu et al, 2020); -C=C-stretching frequency at 1607.69 cm -1 Li et al, 2020c); -CH3 stretching frequency at 1443 cm -1 , 1381 cm -1 (Li et al, 2020c;Zhu et al, 2020;Cai et al, 2018); -COC-stretching frequency at 1271.74 cm -1 , 1096.15 cm -1 , 1035.28 cm -1 , 879cm -1 (Li et al, 2020;He et al, 2018;Fan et al, 2020;Zhu et al, 2020;Yang et al, 2021); -C-C=O stretching frequency at 694.45 cm -1 , 538.01cm -1 , 470.47cm -1 (Li et al, 2020b;Fan et al, 2020;Yang et al, 2021;Marcelo et al, 2006;Xie et al, 2017;Akyıldırım et al, 2017). These indicate the presence of functional groups such as -OH, -CH, -COO-, -CH3, -COC-, -C=O on the surface of LRC and CC.…”

Section: Ftir Analysismentioning

confidence: 98%

Effect of the oxygen-containing functional group on the adsorption of hydrocarbon oily collectors on coal surfaces

He¹,

Hu²,

Luukkanen³

et al. 2022

Physicochem. Probl. Miner. Process.

View full text Add to dashboard Cite

The oxygen-containing functional groups (OCFG) on the coal surface affect the adsorption effect of hydrocarbon oily collectors (HOC). An investigation of the interaction between the HOC and OCFG in the absence and presence of water is conducive to understanding the effect of OCFG type on the adsorption of HOC on the coal surface. In this paper, FTIR analysis was used to analyze the OCFG type of coal surface. The adsorption behavior of HOC on different OCFG surfaces was investigated using molecular dynamics simulation. The results indicated the presence of OCFG such as -OH, -COOH, -C=O, and -COCH3 on the coal surface. In conditions without water, the effect of OCFG on HOC adsorption capability follows the order -COOH > -C=O > -OH > -COCH3. In an aqueous solution, the effect of OCFG on HOC adsorption capability follows the order -C=O>-COCH3>-OH>-COOH. Moreover, the hydrophilicity of OCFG is the key factor that affects the adsorption effect of HOC. In other words, the adsorption effect of HOC on the coal surface in an aqueous solution does not depend on the strength of the interaction between the OCFG and HOC in the absence of water, but on the hydrophilicity of the OCFG. The -COOH and -OH on the coal surface are not conducive to the adsorption of HOC onto the coal surface. Masking the -COOH and -OH of the coal surface is beneficial in improving the coal flotation performance with HOC as a collector.

show abstract

“…Figure 5 shows the FTIR spectra with a similar R1M trend before and after nitrate adsorption. Important bands are attributed to CH 3 at about wavenumber of 1350 cm −1 and C-H at the wavenumber of 900 cm −1 (Cai et al 2018). The band at about 1700 cm −1 can be associated with the carboxyl group (-COO) (Ren et al 2016).…”

Section: Characterization Of Adsorbent Solidmentioning

confidence: 99%

Use of coal beneficiation tailings as solid sorbents in the treatment of nitrate-contaminated real wastewater

et al. 2020

View full text Add to dashboard Cite

This work evaluates the application efficiency of coal tailings beneficiation as a solid sorbent in the treatment of real wastewater contaminated with nitrate. The solid was characterized by XDR, SEM, FTIR and TGA. Adsorption experiments were performed in batch evaluating the effects of pH, solids concentration and contact time parameters. The kinetics of nitrate adsorption was evaluated using pseudo-first-order and pseudo-second-order models. Equilibrium isotherms for this system were analyzed at three different temperatures (298, 308 and 318 K) by Langmuir, Freundlich and Sips models. The best results from the adsorption experiments were pH 6, contact time of 60 min and 1 g 100 mL −1 of solid. The thermodynamics model that best described the behavior of the process was Sips. By applying these conditions to real wastewater, a nitrate removal of 93% was achieved. This result shows that adsorption using coal beneficiation tailings is technically possible.

show abstract

Flotation characteristics of oxidized coal slimes within low-rank metamorphic

Cited by 24 publications

References 19 publications

New Insight into Temperature Effects on Low-Rank Coal Flotation Using Diesel as a Collector

New Insight into Temperature Effects on Low-Rank Coal Flotation Using Diesel as a Collector

Effect of the oxygen-containing functional group on the adsorption of hydrocarbon oily collectors on coal surfaces

Use of coal beneficiation tailings as solid sorbents in the treatment of nitrate-contaminated real wastewater

Contact Info

Product

Resources

About