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

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

“…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.…”

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

“…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.…”

Rheology of Slurry: A Review

“…It is important to determine the operating velocity that is higher than the superficial velocity to avoid settling and sedimentation of solid particles thus preventing blockage of pipeline, but the determined velocity should not be much above the superficial velocity as that leads to extreme wear and tear of the pipeline and pumps. For the iron ore slurry, the operating velocity is normally kept around 1.7m/s [37,39]. The present study shows the influence of solid concentration, particle size distribution, surface characteristics, additives, and temperature on the rheological behavior of iron-ore slurry.…”

“…Recently, it was found that microwave pre-treatment of iron ore reduces the slurry viscosity and yield stress exhibiting shearthinning or pseudo-plastic behavior. The viscosity and density of microwave treated ore is always lower than that of untreated [31,37,52].…”

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

“…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.…”

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

“…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.…”

Rheology of Slurry: A Review

“…It is important to determine the operating velocity that is higher than the superficial velocity to avoid settling and sedimentation of solid particles thus preventing blockage of pipeline, but the determined velocity should not be much above the superficial velocity as that leads to extreme wear and tear of the pipeline and pumps. For the iron ore slurry, the operating velocity is normally kept around 1.7m/s [37,39]. The present study shows the influence of solid concentration, particle size distribution, surface characteristics, additives, and temperature on the rheological behavior of iron-ore slurry.…”

“…Recently, it was found that microwave pre-treatment of iron ore reduces the slurry viscosity and yield stress exhibiting shearthinning or pseudo-plastic behavior. The viscosity and density of microwave treated ore is always lower than that of untreated [31,37,52].…”

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

“…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.…”

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

“…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.…”

Rheology of Slurry: A Review

“…It is important to determine the operating velocity that is higher than the superficial velocity to avoid settling and sedimentation of solid particles thus preventing blockage of pipeline, but the determined velocity should not be much above the superficial velocity as that leads to extreme wear and tear of the pipeline and pumps. For the iron ore slurry, the operating velocity is normally kept around 1.7m/s [37,39]. The present study shows the influence of solid concentration, particle size distribution, surface characteristics, additives, and temperature on the rheological behavior of iron-ore slurry.…”

“…Recently, it was found that microwave pre-treatment of iron ore reduces the slurry viscosity and yield stress exhibiting shearthinning or pseudo-plastic behavior. The viscosity and density of microwave treated ore is always lower than that of untreated [31,37,52].…”

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

“…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.…”