3.1 Response surface plots for alumina dissolution in
hydrochloric acid.
The interaction effects of the variables on the alumina production by
the dissolution of clay in acid medium were studied by plotting 3D
surface response curves against any two independent variables while
keeping another variable at its central level. The 3D plots of the
calculated response (alumina production) plots from the interactions
between the variables are shown in the following plots. The order of
graphs is according to the degrees of the influences of factors on the
dissolution process.