Abstract
In this study, salicylhydroxamic acid (SHA) was added before the depressant dextrin during flotation process as a pre-adsorbent to pre-adsorb chlorite subordinating elements (Al) and hinder the subsequent adsorption of depressants on chlorite, which utilizing reverse flotation to separate specularite from chlorite and reveal the mechanisms behind it. Single-mineral flotation test results indicated that dextrin and starch have comparable depression effect, while dextrin exhibits better selectivity towards specularite than starch. Chlorite's high floatability can be maintained under the same experimental conditions by adding 9 mg/L SHA and there is an effective separation achieved. Zeta potential data, FT-IR and X-ray photoelectron spectroscopy demonstrated that SHA forms four or five membered ring chelates with Al sites and a few Fe sites on the surface of chlorite through O-O bonding, which forms steric hindrance the adsorption of dextrin, and then forms electrostatic attraction with DDA to improve the floatability of chlorite. In addition, the active Fe sites on specularite surface were sufficiently depressed by dextrin, resulting in the selective separation of chlorite from specularite.
Published Version
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