Effect of sodium lignosulfonate in flotation separation of spodumene and gangue minerals with low alkalinity
The effects of sodium lignosulfonate on the floatation and separation behavior of spodumene,feldspar and quartz were studied using oleic acid/dodecyl trimethyl ammonium chloride(quaternary ammonium)as a cationic and anion collector at the natural pH of 8-9.The action mechanism of the agent was discussed by means of contact angle test,adsorption capacity test,infrared spectrum analysis and density functional theory(DFT)calculation.The results show that sodium lignosulfonate has obvious selectivity on the inhibition of three minerals,and it is an effective depressant for the flotation separation of spodumene and gangue minerals under low alkalinity conditions.The adsorption capacity of sodium lignosulfonate on the surface of quartz,spodumene and feldspar are reduced sequentially.There is competitive adsorption between oleic acid/quaternary ammonium and lignosulfonate on spodumene,feldspar and quartz.The adsorption of oleic acid/quaternary ammonium on spodumene is stronger than that on lignosulfonate,but weaker than that on feldspar and quartz surface.Therefore,as a highly efficient organic depressant,sodium lignosulfonate plays an important role in the low basicity flotation of spodumene and gangue minerals.
spodumeneflotationlow alkalinityorganic depressantdensity functional theory
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