Abstract: The water-oil-water (W/O/W) double-phase emulsion was prepared with Span-80 as surfactant, TBP as oil membrane phase, NH3×H2O solution as internal aqueous phase and kerosene as diluting agent. The effects of various factors on the extractive result were examined. The suitable composition of liquid membrane was 5% Span-80, 4% TBP, 2% paraffin, 89%(j) kerosene. And technological operating conditions were determined as follows: the volume ratio of oil phase to the internal phase was 1:1, and the volume ratio of emulsion to the water phase 1:3. Under the optimal operation conditions, the secondary extraction rate of nickel(II) from acidic leaching solution of laterite ores was up to 80%. The extraction mechanism of nickel(II) with emulsion liquid membrane was discussed by differential method. The results indicated that concentration series (nC=1) was less than time series (nt=2.8). So chemical reaction was controlling step.

Key words: emulsion 1iquid membrane, nickel(II), reaction order, acidic leaching solution of laterite ores

摘要： 采用Span-80-TBP-NH3×H2O体系乳状液膜法提取红土矿浸出液中的Ni(II)，研究了膜相组成、内水相试剂浓度、膜相与内水相体积比(油内比)、乳水体积比对镍离子提取效果的影响. 采用微分法测定并比较了反应的浓度级数nC和时间级数nt. 结果表明，膜相组成为Span-80:TBP:石蜡:煤油(体积比)=5:4:2:89、内水相氨水浓度为2 mol/L、油内比为1:1、乳水体积比为1:3、外水相硫酸浓度为0.3 mol/L的条件下，经过二级提取后，红土矿浸出液中Ni(II)去除率可达80%；由浓度级数(nC=1)小于时间级数(nt=2.8)可知，该过程为化学反应控制过程.

关键词: 乳状液膜, 镍, 反应级数, 红土矿酸浸液