Selective inhibition of carboniferous species in lead-zinc sulfide ores by sodium 2-naphthalene sulfonate
Carboniferous species in lead-zinc sulfide ores can adsorb flotation reagents and seriously affect the mineral flotation.In this study,the effects of sodium 2-naphthalenesulfonate(2-NSS)on the flotation of galena,sphalerite and graphite were investigated.The flotation results show that 2-NSS can inhibit the flotation of refractory carboniferous species.After adding 2-NSS,the grade of galena changes from 82.28%to 85.93%,and the recovery rate changes from 82.08%to 97.06%,the grade of sphalerite changes from 61.19%to 63.48%,and the recovery rate changes from 89.31%to 93.46%.Contact angle test,infrared spectral analysis,adsorption test and flotation froth analysis results reveal that 2-NSS can easily be adsorbed on the surface of graphite and difficultly be adsorbed on the surface of galena and sphalerite.The adsorption on the graphite surface can weaken the adsorption of collectors,reduce the consumption of chemicals,and the flotation froth is more stable.The DFT calculations show that 2-NSS is adsorbed on the surface of graphite mainly through π-π stacking.
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