Dear Sir. Concerning your issue about the gas produced at anode when extraction of aluminum in electrolysis. Aluminium is the most abundant metal on Earth. Despite this, it is expensive, largely because of the amount of electricity used up in the extraction process.

Aluminium ore is called bauxite. The bauxite is purified to yield a white powder, aluminium oxide, from which aluminium can be extracted. The extraction is done by electrolysis. But first the aluminium oxide must be made molten so that electricity can pass through it. Aluminium oxide has a very high melting point (over 2,000°C), so it would be expensive to melt it. Instead, it is dissolved in molten cryolite, an aluminium compound with a lower melting point than aluminium oxide. The use of cryolite reduces some of the energy costs involved in extracting aluminium. I think the following below links may help you in your analysis:

http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/chemicals/extractionmetalsrev3.shtml

http://mypchem.com/myp10/myp10_htm/al_ext.htm

https://scienceaid.net/chemistry/applied/aluminium.html

Thanks

Oxygen gas produce at anod, anodeis graphite (carbon) and react with oxygen to give carbon dioxide

Thanks for your answer

Thanks for your answer