THE IN-LINE INSPECTION OF CARBON ANODES FOR ALUMINUM PRODUCTION

In this paper, methods for measuring the quality of carbon anodes cons umed ill the commercial production of aluminum are discussed. The elec trical and mechanical qualities of these anodes are important for the economic operation of the aluminum plant. While the investigation is o ngoing, results from tests made al an aluminum reduction plant are inc luded. The methods reviewed include direct resistivity measurement usi ng core samples, ultrasonic measurement, the hammer method, analysis o f the Hall effect, the four-probe method, ann use of magnetic coils (v arious arrangements).