Extraction Of Neodymium By Emulsion-Liquid-Membrane Within Hollow-fiber-contactor And Its Mass Transfer Properties

Emulsion-liquid-membrane (ELM) separation process is a special separation technique, which invented by L.N.N in 1968. There is not doubt that this is a promising technique. However, some disadvantages existed in dispersive-extraction of emulsion liquid membrane, such as the structure defects and membrane cracking, swelling, leakage and raffinate contamination. To solving these problems, a new extraction technique using a W/O emulsion within a hollow-fiber-contactor(HFC) for the extraction and enrichment of neodymium had been carried out in this paper.The W/O emulsion system is consisted of span80[sorbitian monooleate], D₂EHPA[2-(2-ethylhexyl-phosphonic acid)], kerosene, paraffin oil as well as HCl solution. The hollow-fiber membrane was made of polysulphone. The neodymium extraction using this new technique under various conditions such as the emulsion flow rate, the feed solution flow rate, the HCl solution concentration in receiving phase, the feed concentration...