摘要
Copper,a critical strategic metal primarily from chalcopyrite,is widely used.However,a large amount of chalcopyrite is not effectively recovered resulting from its surface characteristics due to its fine size.This study introduced the use of surface roughness(SR)as a core indicator to evaluate chalcopyrite's flotation performance.Two modification methods including mechanical activation(grinding)and nanoparticle collectors(NPCs)modification were systematically investigated.Grinding enhanced SR from 1.274 to 3.593,improved yield from 55.14%to 63.21%,and increased hydrophobicity,as demonstrated by the rise in contact angle from 55.74°to 68.38°.NPCs demonstrated superior performance,with SR reaching 4.987,contact angle up to 90.75°,and yield as high as 91.45%.The results demonstrated that physical modification(grinding)improved flotability through roughness enhancement,while NPCs offered an optimal solution for chalcopyrite flotation by combining the advantages of increased SR with strong collector interaction.Molecular dynamics simulations revealed the following diffusion coefficient order:CTAB(cetyltrimethylammonium bromide)-NPC>SDS(sodium dodecyl sulfate)-NPC>PEG(polyethylene glycol)-NPC>BX(butyl xanthate)>no collector.This trend demonstrated that higher water molecule mobility corresponded to reduced surface-water binding and enhanced chalcopyrite hydrophobicity induced by collector adsorption.These findings provide valuable insights for optimizing copper mineral processing,particularly for fine chalcopyrite resources.
基金
funded by the National Natural Science Foundation of China(grant Nos.22478231 and U21A20321)
Fundamental Research Program of Shanxi Province(grant No.202403021221011)。
