脂类捕收剂DLZ对黄铜矿和黄铁矿浮选的选择性作用

通过浮选实验、吸附量和红外光谱测定,考察了捕收剂DLZ对黄铜矿和黄铁矿浮选性能的影响及作用机理.结果表明:DLZ在pH=2.7～12.05时对黄铜矿的捕收能力强,最大回收率95.7%,而对黄铁矿的捕收能力弱,且PH=6.9～12.05时其回收率小于10%.用CaO作pH调整剂时,在pH=7～11时黄铜矿的回收率与用NaOH调PH相差不大,但黄铁矿可浮性被抑制,回收率低于5%.DLZ在黄铜矿上的吸附量比在黄铁矿上的大,特别是强碱条件下;其吸附量随用量的增加而增大.DLZ与矿物作用的红外光谱分析表明:黄铜矿与DLZ作用后出现了DLZ的相关特征吸收峰,而黄铁矿与DLZ以及Cu~(2+)作用前后的红外光谱曲线基本没有变化,可见DLZ在黄铜矿表面的吸附属于化学吸附,在黄铁矿表面的吸附属于物理吸附.

Effects of DLZ Collector on Chalcopyrite and Pyrite Flotation

The interaction mechanism of DLZ collector in the flotation process for chalcopyrite and pyrite were investigated through flotation experiments, adsorption capacity measurements and FTIR. The results show that the collecting ability of DLZ to chalcopyrite is much stronger than that to pyrite at pH=2.7-12. 05, the maximum recovery of chalcopyrite is 95.7%. The recovery of pyrite is less than 10% at pH=6.9-12.05. There is no significant change for the recovery of chalcopyrite at pH=7-11 using CaO or NaOH as pH accommodating, and the floatability of pyrite is depressed and the recovery of pyrite is less than 5% while using NaOH as pH accommodating. The adsorption capacity of DLZ onto chalcopyrite surface is more than onto pyrite surface, specially under the strong alkaline conditions. The adsorption capacity of DLZ onto two minerals surface is proportional to the dosage of DLZ. There is a characteristic absorption peak of DLZ after being absorbed onto chalcopyrite surface. The infrared spectrum of DLZ and Cu~(2+) have no obvious change after being absorbed onto pyrite surface. The adsorp-tion of DLZ onto chalcopyrite surface is chemical absorption and that onto the pyrite surface is physical adsorption.