Figure 6 | Scientific Reports

Figure 6

From: Technospheric Mining of Rare Earth Elements from Bauxite Residue (Red Mud): Process Optimization, Kinetic Investigation, and Microwave Pretreatment

Figure 6

(a) Leaching efficiency of scandium (Sc) as a function of time at various temperatures using 1.5 M H2SO4 as the leaching agent. (b) Plots of \([1-3{(1-\alpha )}^{\frac{2}{3}}+2(1-\alpha )]\) versus time at various leaching temperatures. (c) Arrhenius equation plot to determine the apparent activation energy (E a ) of the leaching reaction. Error bars represent the standard error of the mean for four replicates.

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