Study On The New Chalcopyrite Depressor And Its Mechanism In Cu-Mo Flotation Separation

Chalcopyrite and molybdenite are mainly derived from porphyry copper-molybdenum ore.Due to their similar floatability,chalcopyrite depressor should be added to realize efficient separation of copper-molybdenum.But the traditional chalcopyrite depressors have the problems of low efficiency and serious pollution,so it is necessary to study the high efficiency,low toxicity and environmental friendly chalcopyrite depressors.In this thesis,GX1,GX2 and GX3were used as chalcopyrite depressors to carry out single mineral and artificial mixed ore tests and study the effects of different depressors on the flotation behavior of chalcopyrite and molybdomite.The interaction mechanism between depressor and mineral was analyzed by contact Angle,Zeta potential,infrared spectrum and X-ray photoelectron spectroscopy（XPS）.The conclusion is as follows:（1）The recoveries of chalcopyrite band molybdenite are 87%and 92%,respectively,without the addition of depressors under the action of 20 mg/L kerosene collector.In p H range of 8～12 and kerosene concentration of 20 mg/L,GX1,GX2and GX3 were used as chalcopyrite depressors.The results showed that in the absence of amyl xanthoxanthate（PAX）,When GX1 concentration≥400 mg/L,GX2≥60 mg/L and GX3 concentration≥400 mg/L were added,the recovery rate of chalcopyrite was reduced from 90%to below 20%,while the recovery rate of molybdenum was still above 88%.When PAX concentration is 10 mg/L,the recovery of chalcopyrite is reduced to about 20%under the conditions of GX1concentration≥600 mg/L,GX2 concentration≥60 mg/L and GX3 concentration≥500 mg/L,while the recovery of molybdenum remains above 87%.The results show that GX1 and GX3 are used more,and GX2 is used least,which indicates that GX2 has a better inhibition effect on chalcopyrite and can be used for selective separation of chalcopyrite and molybdenum.（2）The mass ratio of chalcopyrite to molybdenite is 3:1.The flotation test of artificial mixed ore was carried out with GX1,GX2 and GX3 as copper depressors under the condition of p H 10 and kerosene concentration 20 mg/L.The results showed that in the absence of PAX,When GX1 concentration≥400 mg/L,GX2concentration≥60 mg/L and GX3 concentration≥400 mg/L,the recovery rate of chalcopyrite can be successfully reduced from 90%to less than 20%,while the recovery rate of molybdenum remains above 88%.When PAX concentration is 10mg/L,GX1 concentration is more than 600 mg/L,GX2 concentration is more than64 mg/L and GX3 concentration is more than 500 mg/L,the recovery rate of chalcopyrite can be reduced from 90%to about 20%.The recovery rate of molybdomite remains above 88%,which further proves that GX2 has excellent selectivity for chalcopyrite in Cu-Mo flotation.（3）The inhibition mechanism of GX1,GX2 and GX3 on chalcopyrite and molybmolybdenum was studied.The results show that after the interaction of GX1,GX2 and GX3 with chalcopyrite,the characteristic peaks of chalcopyrite appear respectively in the infrared spectrum.GX1,GX2,GX3 may be adsorbed on the surface of chalcopyrite by chemical adsorption.A variety of hydrophilic substances are formed on the surface of chalcopyrite,such as Cu O,Cu（OH）₂,Fe OOH,Fe₂（SO₄）₃etc.These hydrophilic substances reduce the hydrophobicity of chalcopyrite surface,resulting in a small contact Angle of mineral surface.GX1,GX2 and GX3 can effectively inhibit chalcopyrite and increase the recovery gap between them to more than 70 percent,successfully achieving flotation separation of copper and molybdenum.The results showed that the contact angles,Zeta potentials,IR spectra and XPS spectra of these three depressors were similar before and after molybdenite interaction.