The effect of microwave’s location in a comminution circuit on improving grindability of a porphyry copper deposit

Gholami, Hamed; Rezai, Bahram; Hassanzadeh, Ahmad; Mehdilo, Akbar; Jabbari, Majid

doi:10.1080/15567036.2020.1753859

Cited by 4 publications

(2 citation statements)

References 46 publications

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“…Furthermore, liberation is achieved by means of comminution operations, which are highly energy-intensive. Hence, a reliable determination is important to avoid overgrinding, which, in consequence, minimises the energy required for mineral processing and the production of fines (Wang et al 2018; Gholami et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of mineral liberation and stereological bias based on X-ray microtomography and scanning electron microscopy for an iron ore tailing

Oliveira

Horta

Silva

et al. 2021

Mineral Processing and Extractive Metallurgy

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A key factor in mineral concentration is mineral liberation. Scanning electron microscopebased (SEM-based) automated image analysis systems have been used to obtain information concerning liberation. One of the limitations of SEM-based techniques is the unavoidable loss of 3D information, leading to significant stereological errors. X-ray microtomography (μCT) emerges as an alternative that permits three-dimensional imaging and direct measurement of spatial characteristics of particles, eliminating stereological issues. We used high-resolution μCT and a microscope-based system to evaluate the characteristics of liberation of an iron ore waste. Grade and surface exposure have been overestimated by the 2D assessment. The stereological effect was more pronounced in surface exposure quantification. We found a linear relationship between (i) grade and surface exposure and (ii) particle size and surface exposure. A comparison of SEM-based and μCT techniques showed that a 3D technique is better for the purpose of particulate systems characterisation.

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Section: Introductionmentioning

confidence: 99%

Evaluation of mineral liberation and stereological bias based on X-ray microtomography and scanning electron microscopy for an iron ore tailing

Oliveira

Horta

Silva

et al. 2021

Mineral Processing and Extractive Metallurgy

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“…A little improvement in preconditioning steps may lead to remarkable changes in downstream processes, particularly selective separations. So far, the only pretreatment methods before floating are desliming [15], attritioning [16], sulphidization [17], and ultrasonic- [18] and microwave-assisted [19][20][21] processes. The most commonly used one is ultrasonic radiation [22] utilized for emulsifying flotation reagents [23] and removing surface coatings of clay and iron oxides from mineral surfaces [24].…”

Section: Introductionmentioning

confidence: 99%

An Improvement on Selective Separation by Applying Ultrasound to Rougher and Re-Cleaner Stages of Copper Flotation

et al. 2020

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It has been known that the power ultrasound is used as a pretreatment and rarely applied as a simultaneous method to improve grade and recovery during froth flotation processes. This work aimed at investigating the impact of simultaneously used ultrasonic waves under variant operating configurations on the flotation of representative porphyry copper ore during rougher and re-cleaner stages. For this purpose, four different operating outlines were examined as (I) conventional flotation, (II) homogenizer, (III) ultrasonic bath, and (IV) combination of a homogenizer and an ultrasonic bath. The ultrasonic vibration was generated by the homogenizer (21 kHz, 1 kW) in the froth zone and ultrasonic bath (35 kHz, 0.3 kW) in the bulk zone. The rougher and re-cleaner flotation experiments were conducted using Denver-type mechanically agitated cells with 4.2 and 1 L capacities, respectively. The results showed that using the homogenizer (at 0.4 kW) slightly affected the selectivity separation index of chalcopyrite and pyrite, although it positively increased the grade of chalcopyrite from 21.5% to 25.7%. The ultrasonic-assisted flotation experiments with the ultrasonic bath and its combination with the homogenizer (0.4 kW) (i.e., configurations III and IV) led to an increase of approximately 16.1% and 26.9% in the chalcopyrite selectivity index compared to the conventional flotation, respectively. At the cleaning stage, a lower grade of aluminum silicate-based minerals was obtained desirably in every ultrasonic-treated configuration, which was supported with the water recoveries. Finally, applying the homogenizer and its combination with the ultrasonic bath were recommended for re-cleaner and rougher stages, respectively. Further fundamental and practical knowledge gaps required to be studied were highlighted.

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Effect of microwave pretreatment on grinding and flotation kinetics of copper complex ore

Gholami

Rezai

Hassanzadeh

et al. 2021

Int J Miner Metall Mater

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The effect of microwave’s location in a comminution circuit on improving grindability of a porphyry copper deposit

Cited by 4 publications

References 46 publications

Evaluation of mineral liberation and stereological bias based on X-ray microtomography and scanning electron microscopy for an iron ore tailing

Evaluation of mineral liberation and stereological bias based on X-ray microtomography and scanning electron microscopy for an iron ore tailing

An Improvement on Selective Separation by Applying Ultrasound to Rougher and Re-Cleaner Stages of Copper Flotation

Effect of microwave pretreatment on grinding and flotation kinetics of copper complex ore

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