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

Hamed Gholami; Bahram Rezai; Ahmad Hassanzadeh; Akbar  Mehdilo; Mohammadreza  Yarahmadi

doi:10.1007/s12613-020-2106-0

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

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Received: 8 April 2020; Revised: 19 May 2020; Accepted: 20 May 2020; Available online: 24 May 2020

Abstract

The present work initially studies the kinetics of microwave-assisted grinding and flotation in a porphyry copper deposit. The kinetics tests were carried out on the untreated and microwave irradiated samples by varying the exposure time from 15-150 sec. Optical microscopy, energy-dispersive X-ray spectroscopy and scanning electron microscopy were used for determining the mineral liberation, particle surface properties and mineralogical analyses. Results disclosed that the ore’s breakage rate constant monotonically increased by increasing the exposure time particularly for the coarsest fraction size (400 µm) owing to the creation of thermal stress fractures alongside grain boundaries. Exceeded irradiation time (>60 sec) led to the creation of oxidized and porous surfaces along with a dramatic change of particle morphologies resulting in a substantial reduction of both chalcopyrite and pyrite’s flotation rate constants and ultimate recoveries. We concluded that MW-pretreated copper ore was ground faster than untreated one but their floatabilities were somewhat similar.

References

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Corresponding author:

Bahram Rezai E-mail: Rezai@aut.ac.ir

1. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, 158754413 Tehran, Iran

2. Department of Processing, Helmholtz Institute Freiberg for Resource Technology, Helmholtz-Zentrum Dresden-Rossendorf, Chemnitzer Straße 40, 09599 Freiberg, Germany

3. Faculty of Engineering, University of Mohaghegh Ardabili, 1136756199 Ardabil, Iran

4. Research and Development Division, Sarcheshmeh Copper Mine, National Iranian Copper Industries Company, Rafsanjan, Iran

Received: 8 April 2020
Revised: 19 May 2020
Accepted: 20 May 2020
Available online: 24 May 2020

Abstract: The present work initially studies the kinetics of microwave-assisted grinding and flotation in a porphyry copper deposit. The kinetics tests were carried out on the untreated and microwave irradiated samples by varying the exposure time from 15-150 sec. Optical microscopy, energy-dispersive X-ray spectroscopy and scanning electron microscopy were used for determining the mineral liberation, particle surface properties and mineralogical analyses. Results disclosed that the ore’s breakage rate constant monotonically increased by increasing the exposure time particularly for the coarsest fraction size (400 µm) owing to the creation of thermal stress fractures alongside grain boundaries. Exceeded irradiation time (>60 sec) led to the creation of oxidized and porous surfaces along with a dramatic change of particle morphologies resulting in a substantial reduction of both chalcopyrite and pyrite’s flotation rate constants and ultimate recoveries. We concluded that MW-pretreated copper ore was ground faster than untreated one but their floatabilities were somewhat similar.

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

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通讯作者: 陈斌, bchen63@163.com

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