CARBON CATHODE MATERIALS - APPROVAL AND QUALITY-CONTROL PROCEDURES

A selected group of individuals representing carbon producers, aluminu m smelters, a test laboratory, and academia was formed to discuss test methods, approval procedures, and quality control methods of carbon c athode blocks and ramming paste. This paper presents the consensus con clusions reached thus far. Existing standards are commented upon, but the importance of performing tests tinder operating conditions is stre ssed. As described in the following, new ISO standards are proposed in the following areas: sodium expansion, sodium resistance, x-ray chara cterization, rammability of paste, expansion/shrinkage of paste.