Electrostatic Separation

Chelgani, S. Chehreh; Neisiani, Ali Asimi

doi:10.1007/978-3-030-93750-8_4

Cited by 1 publication

(2 citation statements)

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“…Figure 4 exhibits a schematic view of the equipment and its components. Detailed information regarding the separation mechanism can be found elsewhere [27][28][29]. It is worth noting that the experiments were conducted once due to the lack of accessibility to the source material and thus the reproducibility of tests should be considered for further analyses.…”

Section: Electrostatic Separationmentioning

confidence: 99%

“…In addition to that, this electrostatic separation technique contains two steps i.e., (i) the charging of particles and (ii) separation. The first step is a particle-surface-based method because electrical conduction mainly takes place on the atomic surface layers [29]. Since the metallic iron is evenly distributed throughout the materials matrix and poly-association of different components with Fe-bearing phases (Figure 6a,b), the Fe content cannot be potentially concentrated in the conductive part.…”

Section: Electrostatic Separationmentioning

confidence: 99%

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An Investigation on Reduction of Calcium Added Bauxite Residue Pellets by Hydrogen and Iron Recovery through Physical Separation Methods

Hassanzadeh

Kar

Safarian

et al. 2023

Metals

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This study investigates the properties of H2-reduced calcium-added bauxite residue, self-hardened pellets, and the feasibility of iron recovery through electrostatic and magnetic separation methods. The oxide pellets are prepared via a mixing of bauxite residue, calcite, and quicklime. The self-hardened pellets are reduced at 1000 °C with hydrogen gas flow for 120 min. The chemical composition, phase identification, and microstructural observations are executed using X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM), respectively. The porosity and strength of the self-hardened pellets are performed by the Mercury intrusion porosimetry and tumbling tests, respectively. The separation of iron is examined through a dry electrostatic technique, and in wet conditions, i.e., via Davis Tube and low-intensity magnetic separation (WLIMS). The effect of the magnetic field (0.1, 0.25, and 0.32 T) is tested on two different particle size fractions (−212 + 106 µm and −106 + 74 µm). It is found that most of the iron oxide in the bauxite residue is converted to metallic iron, which corresponds well with both XRD and SEM results. The Carpco electrostatic tests indicate that this approach is inefficient for the studied type of material because of the intensive association of iron with the rest of the components leading to transferring it to the middling rather than to conductive product. However, both the Davis Tube and WLIMS approve a reasonable improvement in the Fe content from 22% to 37% with acceptable recoveries. The results of the Davis Tube show that there is an optimum magnetic field and particle size for maximization of Fe grade and recovery. Finally, further suggestions are highlighted for the physical beneficiation of studied bauxite residue with the purpose of maximizing iron grade and recovery.

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Section: Electrostatic Separationmentioning

confidence: 99%

Section: Electrostatic Separationmentioning

confidence: 99%