Flotation Behavior Of Chalcopyrite And Pyrite Under Different Collector Systems Inhibited By Cyanide

Cyanidation tailings are produced after gold extraction by cyanidation method,and contain a variety of recyclable valuable metal element minerals.As the metal element minerals in the tailings are suppressed by cyanide for a long time,it is difficult to recover valuable minerals in the tailings,resulting in resource waste.In view of the difficulty in recovering and separating Cu and S elements from tailings,flotation separation tests of pyrite and chalcopyrite which were deeply inhibited by Na CN were carried out with butyl xanthate,Z200 and modified thiamine BIB as collectors.The flotation behaviors of the two minerals under different conditions were explored,and the effects of different factors on the flotation behaviors of the two minerals were investigated.The mechanism of the activation of the two minerals with three collectors was studied by measuring XPS,contact Angle and infrared spectrum analysis.The differences of collecting performance of three kinds of collectors to two kinds of minerals under different conditions were compared.Na CN has a deep inhibition effect on both pyrite and chalcopyrite,and the amount of Na CN required for the deep inhibition of chalcopyrite is much larger than that of pyrite.The higher the p H of the pulp,the deeper the inhibition of both minerals.Both Cu SO₄ and Na₂S₂O₅ can activate the two minerals,but the amount of activator needs to be controlled.The higher the p H value of pulp is,the weaker the activation effect of activator is.The collecting ability of the three collectors was butyl xanthate>Z200>BIB,and the selectivity of BIB>Z200>Butyl xanthate for the two activated minerals.XPS analysis results show that the activated pyrite and chalcopyrite have different modes of action with the three collectors,and the activated pyrite and chalcopyrite can have strong chemical adsorption with butyl xanthate.BIB and Z200 interact weakly with activated pyrite,but have strong chemisorption with activated chalcopyrite.The contact Angle of the two minerals treated with Na CN greatly decreases and the hydrophilicity of the mineral surface increases.The contact Angle of activated pyrite and chalcopyrite increased greatly after the interaction with butyl xanthate,and the adsorption of butyl xanthate on the surface of the two minerals enhanced their hydrophobicity.The contact Angle of activated pyrite with BIB and Z200 changes little,indicating that the two collectors are not adsorbed on the surface of pyrite,while the contact Angle of activated chalcopyrite with BIB and Z200 increases significantly,indicating that BIB and Z200 have adsorption with chalcopyrite.The infrared spectrum analysis shows that CN^-can act on the surface of pyrite and chalcopyrite by means of chemical adsorption.Cu SO₄ and Na₂S₂O₅ can eliminate and alter cyanide-inhibiting components on mineral surfaces.Butyl xanthate acted on the surface of the two activated minerals in the form of chemical adsorption.BIB and Z200 did not interact with the activated pyrite,but had chemical adsorption with the activated chalcopyrite,indicating that the selectivity of BIB and Z200 was better than that of butyl xanthate.