|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Aluminum Reduction Technology
||The Role of Key Impurity Elements on the Performance of Aluminium Electrolysis - Current Efficiency and Metal Quality
||Jassim Ali Al-Mejali, Geir Martin Haarberg
|On-Site Speaker (Planned)
||Jassim Ali Al-Mejali
The behavior of phosphorus and silicon in industrial aluminium cells were investigated. Measurements were carried out in QATALUM cells by analysis of bath and metal after adding of AlPO4, Na3PO4 and SiO2 compounds to the bath. Phosphorus showed to have much longer retention time in the bath than silicon. Start-up and anode effects influence the phosphorus and silicon level in the cells. Data trends showed that the amount of phosphorus decreases with increasing the temperature.
The effect of phosphorus on current efficiency was determined by measuring the metal inventory by copper dilution. The results were compared with current efficiency estimated from measuring the sodium concentration in the aluminium. Mass balance for phosphorus was presented. It was found that massive amounts of phosphorus entering the cells were transported with the off-gases to the dry scrubbers. Mass transfer coefficient for silicon was determined. It was found to be 3.1 x 10-5 m/s.
||Planned: Light Metals Volume