Fluid Phase Equilib.

Phase equilibria for the K2O-AI(2)O(3)-H2O System were investigated at 40 degrees C. In the concentrated alkali region of the phase diagram, only the equilibrium solid-phase K(2)O(.)Al(2)O(3)(.)3H(2)O was found besides (KOHH2O)-H-.. This is different from the fact of the similar system Na2O-Al2O3-H2O. Two invariant points with their respective equilibrium solid pairs (Al(2)O(3)(.)3H(2)O versus K(2)O(.)Al(2)O(3)(.)3H(2)O and K(2)O(.)Al(2)O(3)(.)3H(2)O versus (KOHH2O)-H-.) were identified with their corresponding compositions. These findings can provide a significant database for the removal of alumina from the concentrated alkali solution that was produced in the cleaner manufacturing process for chromium compounds. (c) 2005 Elsevier B.V. All rights reserved.Phase equilibria for the K2O-AI(2)O(3)-H2O System were investigated at 40 degrees C. In the concentrated alkali region of the phase diagram, only the equilibrium solid-phase K(2)O(.)Al(2)O(3)(.)3H(2)O was found besides (KOHH2O)-H-.. This is different from the fact of the similar system Na2O-Al2O3-H2O. Two invariant points with their respective equilibrium solid pairs (Al(2)O(3)(.)3H(2)O versus K(2)O(.)Al(2)O(3)(.)3H(2)O and K(2)O(.)Al(2)O(3)(.)3H(2)O versus (KOHH2O)-H-.) were identified with their corresponding compositions. These findings can provide a significant database for the removal of alumina from the concentrated alkali solution that was produced in the cleaner manufacturing process for chromium compounds. (c) 2005 Elsevier B.V. All rights reserved