This process, however, does not pass without challenges and the main problem is brought about by the high cost of anodes used up in the process. The other problem is the number of impurities that remain in the molten metal, especially the one originating from petroleum cokes used in the fabrication process. Most of these impurities include silicon, titanium, nickel, sulfur, vanadium, and iron. Sulfur is a specific pollutant to the environment as it produces harmful gases during the oxidation process. The other impurities, specifically metals, contaminate the end product and they need more costly procedures in cases where pure Aluminium is needed. If by any chance carbon was not used in the reaction the equation would be 2Al2O3â€”>4Al+302 hence recovering the oxygen consumed. This wou
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