L-半胱氨酸与NaHS组合抑制剂在铜钼分离浮选中的应用及其机理研究

针对目前铜钼分离中黄铜矿抑制剂用量大、环境污染严重等问题,采用L-半胱氨酸(L-CYS)与NaHS的组合作为抑制剂,对黄铜矿和辉钼矿浮选分离进行了研究.在黄药体系下,分别考察了单一抑制剂L-CYS、NaHS和组合抑制剂对单矿物及人工混合矿浮选效果的影响.结果 表明,在pH=8,药剂配比为1∶30,药剂用量为310 mg...

Application and Mechanism of Combined Depressant of L-cystein and NaHS in the Flotation of Chalcopyrite and Molybdenite Separation

In this paper, L-cysteine (L-CYS) and Sodium hydrogen sulfide (NaHS) were mixed used as a combined depressant to separate chalcopyrite and molybdenite, which aims to solve the flotation problems of large dosage of chalcopyrite depressant and serious environmental pollution in the separation of copper and molybdenum. Under the xanthate system, the effects of L-cysteine, NaHS and combined depressant on the flotation experiments of single mineral and mixed mineral were investigated respectively. The flotation results show that when the dosage of reagent is 310mg/L (L-CYS: NaHS=1:30) at pH 8, the depressing effect of combined depressant on chalcopyrite is the best. At this time, compared with the single depressant, the concentration of NaHS was reduced from 600mg/L to 300mg / L, the consumption of NaHS has been halved. The results of Zeta potential suggested that both L-cysteine and NaHS are chemically adsorbed on the mineral surface, and they can also be adsorbed together on the surface of chalcopyrite under the condition of mixed use. The results of infrared spectroscopy showed that butyl xanthate was chemisorbed on the surface of chalcopyrite, NaHS could desorb the xanthate on the surface of chalcopyrite, by contrast the L-cysteine could not remove the xanthate alone. When they were used in combination, firstly, the xanthate on the mineral surface is desorbed by NaHS, and then NaHS and L-CYS are adsorbed together on the chalcopyrite surface, making the chalcopyrite surface hydrophilic.