Investigations on different starches as depressants for iron ore flotation.pdf

Investigations on different starches as depressants for iron ore flotation.pdf

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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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