Dissolution of Alumina in Molten Aluminum Electrolyte Based on Perforated Anode

Abstract

To solve the problem of alumina dissolution in perforated anode technology, dissolution behavior of alumina has been studied in the laboratory by simulating electrolyte parameters of the factory which has adopted the technology. The results show that alumina saturated solubility is 3.991% for system at 940°C. The relationship between dissolution rate and concentration of alumina does not have regular change when alumina concentration is less than about 1%. When the concentration is greater than about 1%, the dissolution rate declines with the increasing concentration of alumina. Combined with the production, the suggestions which can improve energy-saving effect are proposed as follows: the particle size and the concentration of alumina in the electrolyte should be controlled in the range of 44μm to 100μm and 1.5% to 3% respectively; the time interval of point loading and the alumina supply every time can be cut down properly and alumina can be preheated.