Modeling of the solubilities of NiO/NiAl2O4 and FeO/FeAl2O4 in cryolite melts at 1300 K

Abstract

6 . The experimental solubility data were fitted to multiple simultaneous equilibria. Equilibrium constants and values for the formation reactions of the these solutes were thereby estimated. The solubilities of NiO/NiAl 2 O 4 and FeO/FeAl 2 O 4 and solute distributions in Al 2 O 3 -undersaturated cryolite melts were calculated for a number of melt compositions from the present model. The existence of several competitive solute species is inherent to highly buffered ionic cryolite solutions where the traditional log-log methodology had previously failed to identify dominant single solutes. In such solutions, individual solutes of oxides are not likely to dominate over a wide composition range so that a more global modeling is required. The principal solute species identified in the present study exhibit reasonable three-dimensional (3-D) anion geometries. ⌬G 0 f METALLURGICAL AND MATERIALS TRANSACTIONS B

Inert Anodes: An Update

“…These ceramics improve the quality of inert anodes for aluminium electrolysis. Zhang, Wu and Rapp [15] [16], who also developed an arrangement of anodes in aluminium electrolysis cells [17].…”