Characterization and Optimization of Calcination Process Parameters for Extraction of Aluminum from Ethiopian Kaolinite

Figure 6

Model graphs of (a) perturbation plot of calcination temperature, time, and particles size on extracted aluminum, (b) the surface plot of calcination temperature and time effect, (c) the surface plot of calcination time and particles size effect, and (d) the surface plot of calcination temperature and particles size effect on extracted aluminum.

(a)

(b)

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(d)