International General Certificate of Secondary Education (IGCSE) Chemistry Practice Exam

The major cost factor in the extraction of aluminium through electrolysis is the large amounts of electricity required for the process. Electrolysis involves passing an electric current through molten aluminium oxide (alumina) to separate aluminium metal from oxygen. This process is highly energy-intensive, with significant electricity costs due to the high temperatures needed to maintain the molten state of the alumina and the substantial electrical power needed to sustain the electrolysis reaction.

While other factors such as initial capital investment and maintenance costs are important, the consumption of electricity is disproportionately high compared to the costs associated with raw materials or equipment upkeep over time. Therefore, the cost of electricity represents the most significant ongoing expense when extracting aluminium through electrolysis, making it the primary factor influencing the overall economics of aluminium production.