Abstract
Aqueous waste containing low concentrations of tungsten are generated during printed circuit board (PCB) or e-waste recycling process. Study has been initiated to develop a suitable emulsion liquid membrane (ELM) technique for the separation and recovery of tungsten [W(VI)] from such waste using Aliquat 336 in hexane as a carrier and sodium hydroxide as a stripping agent. The waste, having a composition of nearly 600ppm W(VI), 150ppm Pb(II) and below 5ppm concentrations of Cu(II), Mn(II), Zn(II), Co(II), Ca(II), Mg(II), Na(I) and K(I) at pH 5, was used as the feed phase. Various factors that affect the emulsion stability, as well as percentage extraction of W(VI), have been optimized to obtain maximum enrichment of W(VI). An attempt was made to recover W(VI) without making any substantial changes to the waste composition. Under optimized conditions, the extraction percentage of W(VI) was found to be 80% with 4 times enrichment in stripping phase. The separation factor for W(VI) vs. other co-ions was found to be very high thereby indicating selective recovery of W(VI) from the wastewater by using ELM process.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
