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Investigations on different starches as depressants for iron ore flotation
Minerals Engineering 49 (2013) 1–6Contents lists available at SciVerse ScienceDirect
Minerals Engineering
journal homepage: www.elsevier .com/locate /minengInvestigations on different starches as depressants for iron ore flotation0892-6875/$ - see front matter 2013 Elsevier Ltd. All rights reserved.
/10.1016/j.mineng.2013.05.004
? Corresponding author.
E-mail address: bdas@immt.res.in (B. Das).Bhagyalaxmi Kar, Hrushikesh Sahoo, Swagat S. Rath, B. Das ?
CSIR – Institute of Minerals and Materials Technology, Bhubaneswar 751 013, India
a r t i c l e i n f o a b s t r a c tArticle history:
Received 12 February 2013
Accepted 3 May 2013
Available online 24 May 2013
Keywords:
Starch
Depressant
Flotation
Surface charge
Adsorption
FTIRFour different starches, namely soluble starch, corn starch, potato starch and rice starch with different
characteristics have been studied as depressants for hematite in cationic flotation using dodecylamine
as the collector. Surface charge measurement and Fourier transform infrared spectroscopy (FTIR) have
been used to understand the starch–hematite interaction. The lowering of surface charge and change
of peaks at 750–1500 cm1 region indicate the presence of hydrogen bonding and chemical interaction
between hematite and starches. The results of flotation studies with pure minerals of hematite and quartz
and a low grade iron ore at different conditions suggest that all the starches are good depressants for
hematite. Maximum adsorption for all the four starches with hematite occurs at the pH value 5–9.
However soluble starch is found to be the better depressant at slightly alkaline pH. The flotation of nat-
ural occurring banded iron ore using different starches has indicated that it is possible to achieve an iron
grade of 63–65% Fe with 85–88% recovery.
2013 Elsevier Ltd. All rights reserved.1. Introduction
Iron ore production and export play an important role in the
economical development of India. In this context, Indian iron ore
indus
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