Effect and Mechanism of New Chalcopyrite Depressant GX3 on Flotation Separation of Copper and Molybdenum
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摘要:
针对传统黄铜矿抑制剂存在的污染环境和药剂消耗量大等问题，开发新的抑制剂以实现铜钼有效分离具有重要意义。研究了一种新型黄铜矿抑制剂GX3，通过单矿物与人工混合矿浮选实验，讨论了新型抑制剂GX3对Cu、Mo分离效果的影响，探究有无PAX、抑制剂浓度和pH值对黄铜矿和辉钼矿可浮性及铜钼分离性能的影响，采用接触角、Zeta电位、红外光谱、X射线光电子能谱等分析抑制剂与矿物间的作用机理。浮选结果表明：当PAX浓度为10 mg/L时，在pH值为8～12范围和煤油浓度为20 mg/L的条件下，GX3浓度500 mg/L时，黄铜矿的回收率降至20%，而辉钼矿上浮回收率达87%，进而实现铜钼的高效分离。机理研究表明：GX3可以氧化黄铜矿表面生成亲水的氧化物与氢氧化物，使黄铜矿受到抑制，而对辉钼矿的疏水性和表面性质几乎没有影响，从而实现铜钼的有效浮选分离。
Abstract:In view of the problems of environmental pollution and large consumption of reagents in traditional chalcopyrite depressant, it is of great significance to develop new depressant to achieve effective separation of copper and molybdenum. A new type of depressant GX3 was studied. The effects of PAX, depressant concentration and pH value on the floatability of chalcopyrite and molybdenite and the separation performance of copper and molybdenum were investigated by single mineral and mixed mineral flotation tests. The mechanism of action between depressant and minerals was analyzed by contact angle, Zeta potential, infrared spectroscopy and X-ray photoelectron spectroscopy. The flotation results show that when the concentration of PAX is 10 mg/L, the recovery rate of chalcopyrite is reduced to 20% and the recovery rate of molybdenite is 87% when the concentration of GX3 is 500 mg/L at the condition of pH value 8 ～ 12 and kerosene concentration of 20 mg/L, thus achieving efficient separation of copper and molybdenum. The mechanism study shows that GX3 can oxidize the surface of chalcopyrite to form hydrophilic oxides and hydroxides, which inhibits chalcopyrite, but has little effect on the hydrophobicity and surface properties of molybdenite, thus achieving effective flotation separation of copper and molybdenum.
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Key words:
- chalcopyrite /
- molybdenite /
- Cu-Mo separation /
- depressant /
- mechanism
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