An investigation into the influence of microwave energy on iron ore–water slurry rheology

Sahoo, B.; De, S. K.; Meikap, B.C.

doi:10.1016/j.jiec.2014.10.022

Cited by 18 publications

(11 citation statements)

References 17 publications

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“…above the vaporization point of the oils (SL-500) dramatically changes the particle size distribution and, in particular, creates significant fines. Changes in rheological properties of iron ore have been observed previously; for example, it was found that microwave-treated iron ore have a lower density than that of untreated ore after grinding (Sahoo et al, 2015). In the present case, while SL-MW 1 samples reduce the hydrocarbon and H 2 O content and make a free flowing solid, there is no significant decrease in the particle size, which would make subsequent processing simpler due to the problems of processing fine powders.…”

Section: Msupporting

confidence: 68%

“…3 industrial wastes (Kingman et al, 2004;Kumar et al, 2010;Saito et al, 2011;Bobicki et al, 2014;Lam et al, 2015). The rheological behavior of different metallic slurries has been modified by using microwave energy (Sahoo et al, 2015), in addition microwave pyrolysis has been used as a disposal method for waste oil by using a bed of highly microwaveabsorbent material (Lam et al, 2010). Pyrolysis of waste engine oil using a metallic pyrolysis char as a microwave-absorbent material has been reported (Lam et al, 2015).…”

Section: Mmentioning

confidence: 99%

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Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste

Gómez

Wright

Esquenazi

et al. 2019

Journal of Cleaner Production

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Oily hot rolling mill (HRM) sludge containing a high percentage of iron oxides has been treated under microwave irradiation, and the products compared to hexane washed and thermal treated sludges. Metals present in the sludge act as a highly microwave-absorbent material, creating hot spots that trigger the stripping of the water and oils under air. The sludge looses 5 wt.% of water and volatiles under 5 min of microwave irradiation (1000 W at 2,450 MHz), which represents a similar reduction in weight as 4 h heating at 200 °C, but with savings in energy and time. Most importantly, after microwave irradiation, the material also shows an improvement in its rheological properties (free flowing and smaller particle size) and changes in its chemical composition. Microwaved samples are less oxidized than heated ones (lower Fe 3+ content), which is an advantage recycling the sludge as a source of iron with lower oxidation state necessitates a lower coke:ore ratio for blast furnace operation. Highlights• Oily hot rolling mill (HRM) sludge treated with microwave radiation.• Water and hydrocarbon content reduced by microwave treatment.• Reduction of the iron oxidation state of the iron oxides after microwave treatment.

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Section: Msupporting

confidence: 68%

Section: Mmentioning

confidence: 99%

Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste

Gómez

Wright

Esquenazi

et al. 2019

Journal of Cleaner Production

View full text Add to dashboard Cite

show abstract

“…, both frequency and wave number are directly proportional to energy and this indicates higher the energy photons have higher the frequency (Sahoo et al 2015). The presence of functional group and bonding characteristic of the raw and upgraded coals were determined through FTIR measurements using a Nicolet NEXUS-670 FTIR instrument.…”

Section: Fourier Transform Infrared Spectrometermentioning

confidence: 99%

Demineralization mechanism and influence of parameters on high ash Indian coal by chemical leaching of acid and alkali solution

Behera

Chakraborty

Meikap

2018

Int J Coal Sci Technol

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The current research was investigated the mechanism of coal demineralization and the effect of leaching parameters on high ash coal and study the characterization of pre and post-treated coal. The two high ash Indian coal selected from Mahanadi Coalfield Limited, Odisha, pulverized to 375, 230 and 180 lm particle size were undergone simultaneous acid and alkali treatment at a different concentration, temperature and time. The percent demineralization was increased with decrease the size of the particle and rises with leaching parameters. The investigation suggested 180 lm particle size offers efficient demineralization for both coals at 30% NaOH and 30% H 2 SO 4 concentration. The alkali leaching leads to obtaining the demineralization 46% and 42% whereas acid treatment resulted in 34% and 32% of the original coal samples. The extent of demineralization was improved the calorific value of coal. Besides, the degree of demineralization was proved from the FTIR, XRF and FESEM-EDX analysis results. FTIR analysis result showed that the peak intensity of mineral band decreased by the leaching effect and the degree of demineralization was significantly obtained to large extent by the X-ray Fluorescence spectrometer; which elucidates major minerals removed from coal by the leaching effect of acid and alkali solution.

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“…1 Fig. 2 shows absorption peaks in the FTIR spectrum at 3691.0 cm -1 and 3558 cm -1 and weak absorption peaks at 1631.3 cm -1 and 1087.7 cm -1 ; these can be attributed to the asymmetric and symmetric stretching vibrations of hydroxyl groups, indicating the presence of hydroxyl in the initial sample [16,17]. And according to Infrared spectra of mineral edited by Peng et al [18], the broad band at 2530.1 cm -1 corresponds to carbonate groups, likely because of a small amount of MgCO 3 in the sample, stretching vibration bands at 1457.7 cm -1 , 1384.6 cm -1 , 836.9 cm -1 and 711.6 cm -1 can be attributed to M-OH functional groups, in which M represents Fe or Mg, absorption at 617.1 cm -1 and 574.7 cm-1 comes from the bending vibration bands of O-H, stretching vibration bands at 1297.8 cm -1 and 1228.8 cm-1 can be attributed to B-O and bands at 1006.7 cm -1 and 435.4 cm -1 to Si-O.…”

Section: Tfementioning

confidence: 99%

Influence of microwave irradiation on boron concentrate activation with an emphasis on surface properties

Jiang

Zhang

Liu

et al. 2016

Applied Surface Science

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In this study, we employed microwave irradiation for activating boron concentrate, an abundant but low-grade boron mineral resource in China. The boron concentrate was pretreated by microwave irradiation based on TG-DTG-DSC analysis, and the influence of each parameter on processing efficiency was characterized using chemical analysis, XRD, SEM, FTIR and particle distribution analysis. Subsequently, the surface properties of boron concentrate and the mechanism of microwave irradiation was analyzed. Our results indicate that microwave irradiation decreased the processing temperature and shortened the roasting time by accelerating dehydroxylation and oxidation reactions in the boron concentrate, reducing the particle diameter and damaging the microstructure of the minerals, and it increased the B 2 O 3 activity of boron from 64.68% to 86.73%, greater than the optimal conventional treatment. Compared with the simple thermal field, microwave roasting obviously increased ability of the boron concentrate to absorb OHin the leachant and promoted boron leaching by expanding the contact area of the mineral exposed to leachant, boosting the amount of Mg 2+ and Fe 3+ on mineral surfaces, and increasing the hydrophilicity of the boron concentrate respectively. It enhanced the and of boron concentrate from 29.15 mJ/m 2 and 5.07 mJ/m 2 to 37.07 mJ/m 2 and 12.41 mJ/m 2 .

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An investigation into the influence of microwave energy on iron ore–water slurry rheology

Cited by 18 publications

References 17 publications

Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste

Microwave treatment of a hot mill sludge from the steel industry: en route to recycling an industrial waste

Demineralization mechanism and influence of parameters on high ash Indian coal by chemical leaching of acid and alkali solution

Influence of microwave irradiation on boron concentrate activation with an emphasis on surface properties

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