Abstract
A series of metallic-starch complex (MSC) solutions, synthesized by mixing relevant metallic ionic solutions with the caustic starch solution, were used as the flotation depressants to investigate their depressing effects on hematite ore. The MSC is a nano-sized colloidal complex which is configured by hydrophilic metallic hydroxide as the colloidal nucleus on which starch and hydroxyl complex are adsorbed, resulting in a larger molecule than starch itself. The flotation tests showed that the depressing abilities of various MSC (Fe3+, Zn2+, Pb2+ and Mg2+) on the iron minerals were higher than the caustic starch, and the order of depression ability was: Zn2+-starch > Pb2+-starch > Fe3+-starch > Mg2+-starch > caustic starch. Based on the adsorption analysis, the high depressing ability of the MSC arose from increasing the adsorption density of starch on iron minerals and slightly reducing the absorption of the collector dodecylamine. Adsorption behaviour also indicated that the adsorption of the MSC on mineral surfaces was thicker than the caustic starch, and among various MSC the adsorption of Fe3+-starch exhibited the thickest adsorption layer while that of Mg2+-starch the thinnest. Zeta potential indicated that with a weaker electronegativity than the caustic starch, MSC adsorbed onto iron minerals more easily, and the strong electrostatic adsorption with the aid of the hydrogen bonding and chemisorption agreed well with the high depressing ability of the MSC.
Highlights
As to flotation of iron ores, much attention is attached to the reverse flotation as a significant commercial separation process using polysaccharide as the depressant for iron minerals and amine as the collector for silica [1,2]
X-ray diffraction, Fourier Transform Infrared Spectroscopic (FTIR), turbidity analysis, and nano-particle size testing techniques were used to and Mg2+) could be transformed into corresponding hydrophilic metallic hydroxides and hydroxyl understand the properties of metallic starch complexes (MSC)
The metallic-starch complex (MSC) is a type of nano-sized colloidal complex which is configured by hydrophilic metallic
Summary
As to flotation of iron ores, much attention is attached to the reverse flotation as a significant commercial separation process using polysaccharide as the depressant for iron minerals and amine as the collector for silica [1,2]. Starch usually adsorbs onto iron minerals via its active groups forming hydrophilic films, producing its depressing effect on the iron minerals [3]. The amylopectin starch usually produces strong depression on the flotation [5,6], and specially exhibits better depressing action on iron minerals. The chemical modification is one of the most widely used modification methods, and so are their modified products, such as dextrin, carboxyl methyl starch, the oxidized starch, and phosphate ester starch. These modified starches have been widely reported only for laboratory studies, but industrially caustic starch has Minerals 2018, 8, 85; doi:10.3390/min8030085 www.mdpi.com/journal/minerals
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