摘要
通过浸出实验和对浸出产物的粒度、相成分等的后续分析研究表面活性剂及其混合物对锌精矿加压浸出效果的影响。所用表面活性剂为木质素磺酸盐(Lignosulfonate,LS)和十二烷基硫酸钠(sodium dodecyl sulfate,SDS)。通过测量表面张力研究表面活性剂对人工模拟溶液表面活性的影响。结果表明,同时添加LS和SDS具有协同效应,导致表面张力降级。在一系列加压浸出实验中,研究表面活性剂及其混合物浓度(СLS/SDS=0.2~0.8 g/L)、温度(T=120~140℃)、氧分压(pO_(2)=0.5~0.7 MPa)和时间(t=20~120 min)等参数对溶液中锌、铁、铜和铟浸出效果的影响。根据研究结果确定的锌精矿浸出的最优参数为:СLS=0.6~0.8 g/L、СSDS=0.2~0.6 g/L、pO_(2)=0.5 MPa、T=140℃和t=100~120 min。在最优条件下溶液中的锌、铟、铜和铁的浸出率分别为93%~94%、65%~66%、64%~68%和48%~49%。
The influence of surfactants and their mixtures on the efficiency of the pressure leaching of zinc concentrates was studied by leaching tests and subsequent analysis,including granulometric and phase composition studies of the leaching products.Lignosulfonate(LS)and sodium dodecyl sulfate(SDS)were used as surfactants.Additional experiments were performed on artificial solutions to study the effect of surfactants on the solution surface activity by surface tension measurements.The obtained results indicated a synergistic effect of the combined LS and SDS addition,resulting in surface tension reduction.In a series of pressure leaching tests,the effects of the concentration of surfactants and their mixtures(СLS/SDS=0.2−0.8 g/L),temperature(T=120−140°C),oxygen partial pressure(pO_(2)=0.5−0.7 MPa),and time(t=20−120 min)on the extraction of zinc,iron,copper and indium into solution were investigated.Based on the results,optimal parameters were determined to carry out the leaching of zinc concentrates:surfactant mixtures of the compositionСLS=0.6−0.8 g/L,СSDS=0.2−0.6 g/L,pO_(2)=0.5 MPa,T=140°C,and t=100−120 min.These optimal conditions result in extraction of 93%−94%zinc,65%−66%indium,64%−68%copper,and 48%−49%iron into solution.
基金
supported by RF State Assignment,grant number 075-03-2021-051/5(FEUZ-2021-017).
