Decoupling pyrite and arsenopyrite in flotation using thionocarbamate collector
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Date
2021
Authors
Forson, P.
Skinner, W.
Asamoah, R.
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Journal article
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Powder Technology, 2021; 385:12-20
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Thionocarbamate collectors are noted for their high flotation selectivity against pyrite under alkaline condition. In this study, selectivity of O-isopropyl-N-ethyl thionocarbamate (IPETC) is investigated in decoupling flotation response of pyrite and arsenopyrite under single mineral and artificial composite systems. The influence of copper addition, collector adsorption behaviour and mineral surface speciation on flotation response were characterised using complementing electrokinetic and spectroscopic techniques. The results showed no pyrite and arsenopyrite flotation at pH 11 until CuSO4 (2.5 × 10−5 mol/l) addition where arsenopyrite displayed remarkably good, CuSO4 concentration dependent flotation response relative to pyrite. Collector concentration (> 4 × 10−6 mol/l IPETC) had little effect whilst the flotation response was highly pH dependent. The preferential IPETC adsorption on copper-treated arsenopyrite at pH ≥11, yielding 90% arsenopyrite and 11% pyrite concentrate recovery, was ascribed to chelate formation between sulphur and copper and a synergistic coordination of the σ bond of arsenic and deprotonated nitrogen of IPETC.
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Data source: Supplementary data, https://doi.org/10.1016/j.powtec.2021.02.057
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Copyright 2021 Elsevier
Access Condition Notes: Accepted manuscript available after 1 April 2023