Iron ore grindability improvement by microwave pre-treatment

Kumar, Pravin; Sahoo, B.; De, S. K.; Kar, Debanjana; Chakraborty, Sudipto; Meikap, B.C.

doi:10.1016/j.jiec.2010.05.008

Cited by 77 publications

(18 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The scanning electron micrograph (SEM) of iron ore characterized micro cracks and fissures developed along grain boundaries after microwave treatment, resulted in smoothing of surface. X-ray powder diffraction (XRD) measurements confirmed that microwave treated sample has peak more than that of untreated, which indicated the increase of crystallinity with the microwave exposure time [12,20,21].…”

Section: Fourier Transform Infrared Spectrometer (Ftir Spectrometer)mentioning

confidence: 99%

See 1 more Smart Citation

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

Sahoo

Meikap

2015

Journal of Industrial and Engineering Chemistry

Self Cite

View full text Add to dashboard Cite

Section: Fourier Transform Infrared Spectrometer (Ftir Spectrometer)mentioning

confidence: 99%

“…Experiments were carried out in microwave oven at 3 kW in batch operation for iron ores containing hematite, magnetite and goethite and heated to average maximum temperatures between 840 and 940 8C [19]. Grinding characteristics of Indian coal and iron ore was improved by microwave pre-treatment at 900 W power level [20,21].…”

mentioning

confidence: 99%

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

Sahoo

Meikap

2015

Journal of Industrial and Engineering Chemistry

Self Cite

View full text Add to dashboard Cite

“…The main reasons are the different absorption characteristics of each component in the NCS and the non-uniform electric field of the microwave field, which produces a large temperature gradient and makes the material particles crack. This characteristic of microwave is often used in assisting grinding, as Sahoo [37] and Kumar [38] report. In addition, the weight of NCS is reduced by more than 20% after roasted at 450 • C for 10 min in microwave field, shown in Figure 9b.…”

Section: Microwave Heating Curves Of the Ncsmentioning

confidence: 98%

High-Temperature Permittivity and Microwave Pretreatment Characteristics of Nickel-Containing Sludge from Battery Production

Guo

Ping

et al. 2019

Processes

View full text Add to dashboard Cite

Permittivity is a vitally important parameter for the description of the absorption and heating characteristics of materials under microwave irradiation. In this paper, the permittivity of nickel-containing sludge (NCS), which is created during battery production as a cheap secondary resource, was measured at temperatures from 20 • C to 600 • C at 2.45 GHz using the cavity perturbation method. In addition, the loss tangent (tanδ) and penetration depth (Dp) of microwaves into the material were calculated. The results of the permittivity study show that the dielectric constant (ε ) and dielectric loss factor (ε") of the NCS increase with increasing temperature. The variations of the loss tangent (tanδ) and penetration depth (Dp) with the temperature can be divided into two parts at 200 • C. The effect of the initial moisture content on the dielectric properties of the material is notably greater than that of the temperature, which was confirmed by the heating curve. After microwave pretreatment, the nickel-containing phase is transformed into NiO, while the weight of NCS is reduced by more than 20%, the particle size is significantly reduced and the leaching time reduce 20 min than that of conventional heating.

show abstract

“…It can be concluded that microwave radiation has a positive effect on magnetic separation from non-magnetic minerals with low energy consumption, thereby obtaining high iron recovery. It is well known that energy consumption during mill process could reach 50-70% in the whole beneficiation process, but some studies show that energy consumption of the mill could reduce by 25% by application of microwave technology [8,15,26]. Figure 13 shows the XRD patterns for the magnetic and non-magnetic fractions after magnetic separation of the microwave-treated sample for 40 s of exposure time at 4 kW of microwave power.…”

Section: Effect Of Microwave Radiation On the Magnetic Separation Of mentioning

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.

View full text Add to dashboard Cite

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.

show abstract

Iron ore grindability improvement by microwave pre-treatment

Cited by 77 publications

References 18 publications

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

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

High-Temperature Permittivity and Microwave Pretreatment Characteristics of Nickel-Containing Sludge from Battery Production

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

Contact Info

Product

Resources

About