Research on the separation of malachite from quartz with S-carboxymethyl-O, O′-dibutyl dithiophosphate chelating collector and its insights into flotation mechanism
2020
Zhang, Xingrong | Lü, Liang | Zhu, Yangge | Han, Long | Li, Chengbi
In present research, a new chelating collector S-carboxymethyl-O, O′-dibutyl dithiophosphate (CMDT) was used in the flotation separation of malachite from quartz. The flotation performances of CMDT on malachite (Cu₂CO₃(OH)₂ and quartz (SiO₂) were evaluated by micro-flotation tests. The flotation results demonstrated that CMDT exhibited a stronger adsorption and a better selectivity on malachite against quartz. A good separation efficiency for artificially mixed minerals was obtained at pH around 9.0 with Na₂S as a regulator together. The CMDT adsorption mechanism was investigated and analysed by Fourier transform infrared spectroscopy (FT-IR), zeta potential and X-ray Photoelectron Spectroscopy (XPS) analysis. The FT-IR spectra showed that CMDT could react with Cu²⁺ ions and might adsorb on malachite surface by strong chemisorption. On the other hand, zeta potential and XPS analysis results provided enough evidences that CMDT possessed a stronger affinity on malachite than quartz.
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