The impact of shape and morphology of gangue minerals on pulp rheology and selective value mineral separation

Somasundaran, P., Patra, P. and Nag, D. R. (2012). The impact of shape and morphology of gangue minerals on pulp rheology and selective value mineral separation. In: Pradip (Conference President), XXVI International Mineral Processing Congress - IMPC 2012: Conference Proceedings. XXVI International Mineral Processing Congress - IMPC 2012, New Delhi, India, (5130-5137). 24-28 September 2012.

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Name Description MIMEType Size Downloads
Author Somasundaran, P.
Patra, P.
Nag, D. R.
Title of paper The impact of shape and morphology of gangue minerals on pulp rheology and selective value mineral separation
Conference name XXVI International Mineral Processing Congress - IMPC 2012
Conference location New Delhi, India
Conference dates 24-28 September 2012
Proceedings title XXVI International Mineral Processing Congress - IMPC 2012: Conference Proceedings
Place of Publication New Delhi, India
Publisher Technowrites
Publication Year 2012
Sub-type Fully published paper
ISBN 8190171437
Editor Pradip (Conference President)
Start page 5130
End page 5137
Total pages 8
Collection year 2013
Language eng
Abstract/Summary Gangue minerals can often have severe adverse effects on selective value mineral separation. Such effects can be mediated through a variety of pathways or mechanisms. One popular mechanism is that of "slime coating" or heterocoagulation, wherein the gangue mineral fines are believed to coat the value mineral surfaces and thereby reduce selectivity and floatability. Another pathway that has received relatively little attention is that mediated through the effect of gangue minerals on pulp rheology, and consequently selective separation. Our recent work in developing a scientific understanding of these effects has highlighted the prevalence and importance of this pathway. In this study, the impact of shape and morphology of serpentine gangue minerals on suspension rheology and selective Ni flotation from ultramafic ores was investigated. We found strong evidence for microand macro-network formation in the presence of acicular (needle-shaped) or fibrous minerals, which impacted pulp rheological properties. Results also supported the hypothesis that morphology has a greater role to play than mere shape. The size of the network ranged from 5 microns to 2 em depending upon the amount and aspect ratio of fibrous minerals. These networks impede many flotation sub-processes, such as gas dispersion and bubble-particle interactions. Additionally, the small pore size of the networks prevents bubble penetration leading to a large transport of the gangue minerals to the concentrate via lifting of the entire network by bubble flux, which resulted in a significant grade dilution. Based on the scientific insights generated in this study various techniques have been developed to improve selective value mineral separation.
Keyword Fibers
Aspect ratio
Microstructures
Networks
Pulp viscosity
Gangue transport
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Conference Paper
Collections: Julius Kruttschnitt Mineral Research Centre Publications
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Created: Mon, 08 Oct 2012, 14:47:29 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre