Effect of microwave pre-treatment on the magnetic properties of iron ore and its implications on magnetic separation

Omran, Mamdouh; Fabritius, Tapio; Elmahdy, Ahmed M.; Abdel-Khalek, N. A.; El-Aref, Mortada; Elmanawi, Abd El-Hamid

doi:10.1016/j.seppur.2014.09.011

Cited by 81 publications

(39 citation statements)

References 16 publications

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“…This finding confirmed by other researchers [13,44,47,48]. This result was investigated by Omran et al [4]. They concluded that the improvement in iron recovery is attributed to microwave radiation enhancement of the magnetic properties of weak magnetic mineral (hematite) through the altering of the paramagnetic hematite mineral to more magnetic phases.…”

Section: X-ray Photoelectron Spectroscopy (Xps)supporting

confidence: 85%

“…and the satellite peak has disappeared from the spectrum, which indicated that the iron found is a mixture of Fe(+II) and Fe(+III) oxidation states. These results indicated that after microwave radiation a portion of Fe(+III) was reduced to Fe(+II) and more magnetic phase was formed as investigated elsewhere [4]. These results indicated that microwave radiation had a positive effect on the magnetic properties of iron oxide, through the formation of ferromagnetic phases.…”

Section: Fe2p 3/2 Satellitesupporting

confidence: 65%

“…Omran et al [4] investigated the influence of microwave radiation on the magnetic properties and magnetic separation of iron ore. The results indicated that the improvement in iron recovery is attributed to microwave radiation enhancement of the magnetic properties of weak magnetic mineral (hematite) through altering the mineral to more magnetic phases (maghemite or magnetite).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

XPS and FTIR spectroscopic study on microwave treated high phosphorus iron ore

Omran

Fabritius

Elmahdy

et al. 2015

Applied Surface Science

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137

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a b s t r a c tA growing interest in microwave heating has emerged recently. Several potential microwave applications regarding minerals' processing have been investigated. This paper investigates the effect of microwave radiation on Egyptian high phosphorus iron ore. Three different iron ore samples have varying Fe 2 O 3 and P 2 O 5 contents and mineralogical textures were studied. A comparative study has been carried out between untreated and microwave treated iron ore. XRD and FTIR analyses showed that after microwave radiation the crystallinity of iron bearing minerals (hematite) increased, while the functional chemical groups of phosphorus bearing minerals (fluorapatite) and other gangues dissociated. High resolution XPS analyses of Fe 2p peaks showed that after microwave radiation a portion of Fe(+III) was reduced to Fe(+II). This means that after microwave radiation iron oxide (hematite, Fe 3+ ) transformed into more magnetic phase. The results indicated that microwave radiation had a positive effect on the magnetic properties of iron oxide, through formation of ferromagnetic phases.

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Section: X-ray Photoelectron Spectroscopy (Xps)supporting

confidence: 85%

Section: Fe2p 3/2 Satellitesupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

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XPS and FTIR spectroscopic study on microwave treated high phosphorus iron ore

Omran

Fabritius

Elmahdy

et al. 2015

Applied Surface Science

Self Cite

137

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“…The magnetic properties of minerals can be improved by using microwave treatment, which is a potentially efficient technology for magnetic separation with low energy consumption. The effect of microwave radiation on a number of minerals, e.g., chalcopyrite, hematite and wolframite, exhibits a considerable increase in magnetic susceptibility after being exposed to microwave radiation [8]. Uslu' study indicates that the magnetic susceptibility of pyrite could be increased obviously after microwave radiation due to decomposition of pyrite to improve magnetic phases of pyrrhotite [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of microwave pre-treatment on the magnetic properties of Ludwigite and its implications on magnetic separation

Liu

Jiang

Liu

et al. 2018

Metall. Res. Technol.

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To improve magnetic separation and recovery for Ludwigite, the influences of microwave radiation on the heating characteristics, microstructure, magnetic properties and the magnetic separation of Ludwigite are investigated. The magnetizations of untreated and microwave-treated samples with various microwave powers are analyzed using vibrating sample magnetometer. It is found that magnetite is an active material, while ascharite and serpentine are inactive materials. The heating rate of magnetite is faster than those of ascharite and serpentine, resulting in temperature gradient and internal stress among different components in Ludwigite. The effect of microwave power on the internal stress for mineral phases is positive. The internal stress significantly induces intergranular fractures and facilitates mineral liberation. After microwave treatment from 0 to 4 kW exposed for 40 s, serpentine is dissociated and the crystallinity of magnetite is increased, which leads to the saturation magnetization of samples increasing from 12.39 to 24.51 emu/g. Compared with untreated ore, the energy demand for microwave-treated Ludwigite is only about 0.44 kWh/kg, the grade of iron concentrate of microwave-treated Ludwigite increases from 48.56% to 58.06% and iron recovery increases from 69.44% to 96.35%, respectively. It can be concluded that microwave radiation has a positive effect on magnetic properties of Ludwigite and is conducive to magnetic separation from non-magnetic minerals with low energy consumption, thereby obtaining high iron recovery.

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“…[1][2][3] In high phosphorus iron ore, the apatite phase and hematite phase are so intimately intermixed, [4,5] which makes it hard to grind the ore to a fine enough size to separate iron oxides and phosphorous containing phase by the conventional mechanical crushing methods. [6,7] In recent years, Omran et al [8][9][10][11] have widely investigated the influence of microwave heating on the structureand the separation of phosphorus and magnetic properties of high phosphorus oolitic iron ores; the results show that microwave treatment improves phosphorus separation and magnetic properties, and consumes considerably less energy compared with the conventional thermal treatment.…”

Section: Introductionmentioning

confidence: 99%

Separation of P Phase and Fe Phase in High Phosphorus Oolitic Iron Ore by Ultrafine Grinding and Gaseous Reduction in a Rotary Furnace

Gao

Guo

2015

Metall Mater Trans B

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Due to the oolitic structure of the high phosphorus iron ore and the closely wrapping of apatite and hematite phases, an approach using jet mill was utilized to grind the ore to ultrafine 0.01 to 0.001 mm, which realizes the dissociation of apatite phase and hematite phase. Then in a laboratory scale rotary furnace, high phosphorus ores of different sizes were reduced by reducing gas at sub-melting point temperatures (973 to 1173 K [700 to 900°C]). In the rotating inclined reactor, the ore particles reacted with the reducing gas coming from the opposite direction in a rolling and discrete state, which greatly improved the kinetic conditions. In this study, the reaction rate increases significantly with the decrease of particle size. For the ultrafine high phosphorus iron ores, the metallization ratio can reach 83.91 to 97.32 pct, but only 33.24 to 40.22 pct for powders with the size of 0.13 to 0.15 mm. The reduced particles maintained their original sizes, without the presence of sintering phenomenon or iron whisker. Hence, two kinds of products were easily obtained by magnetic separation: the iron product with 91.42 wt pct of Fe and 0.19 wt pct of P, and the gangue product with 13.77 wt pct of Fe and 2.32 wt pct of P.

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Effect of microwave pre-treatment on the magnetic properties of iron ore and its implications on magnetic separation

Cited by 81 publications

References 16 publications

XPS and FTIR spectroscopic study on microwave treated high phosphorus iron ore

XPS and FTIR spectroscopic study on microwave treated high phosphorus iron ore

Effect of microwave pre-treatment on the magnetic properties of Ludwigite and its implications on magnetic separation

Separation of P Phase and Fe Phase in High Phosphorus Oolitic Iron Ore by Ultrafine Grinding and Gaseous Reduction in a Rotary Furnace

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