Recovery of Sc³⁺ from Red Mud Leaching Solution by Emulsion Liquid Membrane

Abstract

In this paper, recovery of scandium from red mud leaching solution by emulsion liquid membrane (ELM) was studied. Composition of ELM is P507+ span80 + sulfonated kerosene + HCl. Effects of mobile carrier and surfactant concentration, Roi, Rwe, internal and external aqueous phase acidity on the extracting rate of Sc3+were studied. Results show that it is feasible for ELM extracting Sc3+from the red mud leaching solution. The optimum condition for ELM extracting scandium from the red mud is P507%=8%, Span80%=7%, Roi=2:3, Rwe=6, internal aqueous c(HCl)=2 mol/L, external aqueous phase pH=2. The extracting rate of Sc3+can reach to 98% under optimal condition.

The Effect of Surfactants on Separation of Light Rare Earth Metals using Emulsion Liquid Membrane Method: Review

“…However, there was a decrease in extraction efficiency at a 5-7% concentration. This case shows that the best extraction efficiency for Sc 3+ separation is span-80 with a concentration of 3% (Wang et al, 2011). Purwani & Biyantoro (2013) separated Th and Ce using a span-80 surfactant with 2.5-4.5% concentrations.…”

“…(1) Span-80 Span-80 is the most frequently used surfactant in the separation of light rare earth metals by the ELM method, such as in the separation of U and Ce (Washito et al, 1996), separation of Sc (Wang et al, 2011), separation of Th and Ce (Purwani & Biyantoro, 2013), separation of Ce (Hachemaoui et al, 2015), separation of Nd (Anitha et al, 2015), and separation of Y and Dy (Basuki & Pamungkas, 2019). Washito et al (1996) performed the separation of U and Ce using a span-80 surfactant with concentrations from 1-8%.…”

“…The cause is that too much surfactant in the membrane phase will increase the viscosity of the emulsion so that it can slow down the diffusion of the complex in the membrane phase (Hidayah et al, 2017). Wang et al (2011) performed the separation of Sc using a span-80 surfactant with concentrations varying from 1-7%. Figure 6 shows the addition of 1-3% span-80 increased the extraction efficiency up to 98.5% at a concentration of 3% span-80.…”