Figure 7 | Scientific Reports

Figure 7

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

Figure 7

The effect agitation on the leaching efficiency of REE from bauxite residue in 1.5 M H2SO4 at 90 °C (with and without microwave pretreatment) within 30 min residence time. The dashed lines represent the maximum leaching efficiency that could be achieved using 3 M HNO3 at 90 °C without microwave pretreatment. Error bars represent the standard error of the mean for four replicates.

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