基于降低悬浮颗粒Zeta电位的铜精矿沉降过程研究

以内蒙古乌山铜钼矿铜精矿矿浆为例, 研究了加入絮凝剂/凝聚剂后矿浆的沉降过程, 以及絮凝剂/凝聚剂种类与矿浆的Zeta电位的关系。实验研究发现, 无机凝聚剂WA能使矿浆Zeta电位改变符号, 在不同药剂用量下, 由原来的-15.69 mV变为+2.39 mV; 有机高分子絮凝剂WB作用下的矿浆电位始终为负值, 但存在电位绝对值先降低再升高的趋势, WA和WB均能起到强化铜精矿沉降的作用。按照最佳用量下矿浆电位接近于零的原则, WA的最佳用量为850 g/t, WB的最佳用量为2.5 g/t。通过pH值条件试验, 认为WA的最佳使用范围为pH=5～9, WB的最佳使用范围为pH=9～11。并从分子结构和质子迁移理论的角度进行了解释。

Study of Copper Concentrate Settlement by Reducing the Absolute Value of ζ-potential of Particles

The influence of different coagulants/flocculants on the settlement performance of copper concentrate pulp from Wunugetushan Copper-molybdenum Mine of Inner Mongolia was studied, so does the relationship between the dosage of coagulants/flocculants and the ζ-potential of the pulp. It is found that the ζ-potential would change the sign, from -15.69 mV to +2.39 mV under different dosage of an inorganic coagulant WA; while the ζ-potential remains negative when an organic polymer flocculant WB was used, although the absolute value descends and then ascends along with the increasing of WB dosage. Both WA and WB can strengthen the settlement of copper concentrate. Observing the principle as ζ-potential of the pulp being close to zero for the best dosage of reagent, the proper dosage for WA and WB is 850 g/t and 2.5 g/t respectively. It is also found from experiment that the best pH range for WA is 5～9, while 9～11 for WB.  The results have been explained based on the study on molecular structure of coagulants/flocculants and on the theory of proton transfer.