Separation of Critical Metals Using Supported Liquid Membranes PTFE-Cyanex 272

Most common separation processes in hydrometallurgical processes are ion exchange and precipitation. However, novel technologies have been developed aiming at greener technologies and lower energy consumption and greenhouse gas emissions. Membrane technologies are being studied as a potential separation technique in hydrometallurgical processes including ultrafiltration, nanofiltration, and electrodialysis. Supported liquid membranes have been studied due to their selectivity and easy synthesis supported with organic extractants. This study aimed at the evaluation of Co(II) separation from Ni(II) through a membrane supported with phosphinic acid extractant. Experiments were carried out with two chambers at 25 degrees C, where the feed chamber contained the metals in sulfuric media and receiving acid solution. The membrane was prepared with PTFE/PVDF and Cyanex 272 10% diluted in kerosene as carrier. The effect of membrane preparation, Cyanex concentration, and pH in receiving chamber were evaluated. Results demonstrated the Ni/ Co separation factor reached 4 without the use of concentrated acid for stripping.