酸性体系中蛇纹石矿泥的抑制及其对硫化铜镍矿浮选的影响

Suppression of serpentine slime in acid flotation and its effect on flotation of copper-nickel sulfide ore

为了消除硫化铜镍矿物表面的氧化膜,抑制蛇纹石等含镁脉石矿泥对浮选影响,在硫化铜镍矿的酸性浮选工艺的基础上研究了羧甲基纤维素(CMC)对硫化铜镍矿浮选过程的优化效果,并探讨了CMC的作用机理。结果表明:1×10^−3 mol/L盐酸溶液及20 min超声预处理可以显著强化硫化铜镍矿的可浮性,酸性浮选体系可以在更宽的pH范围内取得较好的回收率;在pH=3的酸性体系中添加20 mg/L CMC,硫化铜镍矿浮选精矿镍品位提高至19.42%,回收率提高至60.05%;分别比同等条件下不添加CMC的浮选指标分别提高了1.78%和22.79%;CMC对蛇纹石矿泥选择性抑制是其优化硫化铜镍矿浮选过程的主要原因;浊度及表面动电位测试表明CMC加入量必须控制于20 mg/L以内,过量的CMC产生有团聚作用,不利于矿泥颗粒间的分散。

The optimization effect of carboxymethyl cellulose(CMC)in the acid flotation of vulcanized copper-nickel was studied in order to eliminate the oxide film on the surface of Copper-Nickel sulfide ore and inhibit the influence of magnesium-containing mineral,such as serpentine.And the mechanism of CMC’s action was discussed.The results show that the floatability of copper-nickel sulfide ore can be significantly enhanced by the pretreatment of 1×10^−3 mol/L hydrogen chloride solution and 20 min ultrasonic.And there can obtain a better recovery rate in the wider pH range of acid flotation.After adding 20 mg/L CMC to the ore slurry with pH of 3,the nickel grade of concentrate and the recovery rate increase to 19.42%and 60.05%,respectively,which are 1.78%and 22.79%higher than those without CMC.It is the main reason for optimizing the flotation that the CMC has selective suppression of serpentine slime.The turbidity and surface dynamic potential test show that the dosage of CMC must be controlled within 20 mg/L.The excess CMC has a cohesion effect,which is not conducive to dispersion between the mud particles.