Characterising and quantifying microwave induced damage in coarse sphalerite ore particles

被引：38

作者：

Charikinya, E. ^{[1
]}

Bradshaw, S. ^{[1
]}

Becker, M. ^{[2
]}

机构：

[1] Univ Stellenbosch, Dept Proc Engn, ZA-7600 Stellenbosch, South Africa

[2] Univ Cape Town, Dept Chem Engn, Ctr Minerals Res, ZA-7700 Rondebosch, South Africa

来源：

MINERALS ENGINEERING | 2015年 / 82卷

基金：

新加坡国家研究基金会;

关键词：

Microwaves; Sphalerite; X-ray tomography; Mineralogy; Cracks; Heap leaching; Particles; EXPOSURE MODEL; MINERALS;

D O I：

10.1016/j.mineng.2015.07.020

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Microwave induced cracks have the potential to enhance metal recovery from coarse sphalerite particles in heap leaching operations by creating new crack surface areas for lixiviant. The characteristics and quantity of microwave induced cracks and how these cracks subsequently affect heap leaching recovery has not yet been investigated. This study characterised and quantified microwave induced crack damage by applying X-ray computed tomography (XCT) and Quantitative Evaluation of Minerals by Scanning Electron Microscopy (QEMSCAN) analysis. Sphalerite ore particles representing small (-5 + 4.75) mm, medium (-16 + 9.5) mm, and large (-25 + 19) mm HPGR and cone crushed products were microwave treated at specific microwave heating energies of between 1 and 3 kW h/t Image segmentation, thresholding and spatial registration techniques were used to study crack patterns in the XCT 3D images. The results showed the presence of microwave induced cracks within the cone and HPGR microwave treated particles. The cracks consist of both interphase trans-granular and grain boundary cracks. Both XCT and QEMSCAN analysis results showed that microwave treatment resulted in a significant increase of over 500% in crack volume for both modes of prior comminution at all particle sizes. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：14 / 24

页数：11

共 31 条

[1] Bonded-particle modelling of microwave-induced damage in ore particles [J].

Ali, A. Y. ;

Bradshaw, S. M. .

MINERALS ENGINEERING, 2010, 23 (10) :780-790

[2] Quantifying damage around grain boundaries in microwave treated ores [J].

Ali, A. Y. ;

Bradshaw, S. M. .

CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION, 2009, 48 (11-12) :1566-1573

[3]

Bradshaw S, 2007, J MICROWAVE POWER EE, V40, P228

[4]

CHEN TT, 1984, CAN METALL QUART, V23, P349

[5]

Daniel M.J., 2007, Energy Efficient Mineral Liberation Using HPGR Technology

[6] Investigation of the effect of mineralogy as rate-limiting factors in large particle leaching [J].

Ghorbani, Yousef ;

Becker, Megan ;

Petersen, Jochen ;

Mainza, Aubrey N. ;

Franzidis, Jean-Paul .

MINERALS ENGINEERING, 2013, 52 :38-51

[7] Investigation and modelling of the progression of zinc leaching from large sphalerite ore particles [J].

Ghorbani, Yousef ;

Petersen, Jochen ;

Becker, Megan ;

Mainza, Aubrey N. ;

Franzidis, Jean-Paul .

HYDROMETALLURGY, 2013, 131 :8-23

[8] An experimental study of the long-term bioleaching of large sphalerite ore particles in a circulating fluid fixed-bed reactor [J].

Ghorbani, Yousef ;

Petersen, Jochen ;

Harrison, Susan T. L. ;

Tupikina, Olga V. ;

Becker, Megan ;

Mainza, Aubrey N. ;

Franzidis, Jean-Paul .

HYDROMETALLURGY, 2012, 129 :161-171

[9] Use of X-ray computed tomography to investigate crack distribution and mineral dissemination in sphalerite ore particles [J].

Ghorbani, Yousef ;

Becker, Megan ;

Petersen, Jochen ;

Morar, Sameer H. ;

Mainza, Aubrey ;

Franzidis, J. -P. .

MINERALS ENGINEERING, 2011, 24 (12) :1249-1257

[10] Large particle effects in chemical/biochemical heap leach processes - A review [J].

Ghorbani, Yousef ;

Becker, Megan ;

Mainza, Aubrey ;

Franzidis, Jean-Paul ;

Petersen, Jochen .

MINERALS ENGINEERING, 2011, 24 (11) :1172-1184

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