aluminum is extracted from aluminum oxide by a process called electrolysis. first of all aluminum oxide needs to be in molten form to extract the aluminum ions. aluminum oxide however has a high melting point. therefore aluminum oxide is dissolved in molten cryolite.
this process produces a thick paste that is collected in special containers and heated with steam to remove most of the silicon present in bauxites. the ore is loaded into autoclaves and treated with lime–caustic soda. aluminium oxide appears in the resulting slurry while all the admixtures settle to the bottom as red mud.
the extraction of aluminium involves two steps that is purification of bauxite by baeyer 39;s process and electrolysis of alumina. 1. purification of bauxite by baeyer 39;s process in the baeyer 39;s process the bauxite ore is heated with concentrated naoh solution under pressure (aluminum is purified by leaching method).the alumina dissolves as sodium meta aluminate.
the extraction process converts the aluminium oxide in the ore to soluble sodium aluminate 2naalo 2 according to the chemical equation: al 2 o 3 + 2 naoh → 2 naalo 2 + h 2 o. this treatment also dissolves silica but the other components of bauxite do not dissolve.
extraction and uses of aluminium. note: you may find all sorts of other formulae given for the product from this reaction.these range from naalo 2 (which is a dehydrated form of the one in the equation) to na 3 al(oh) 6 (which is a different product altogether).. what you actually get will depend on things like the temperature and the concentration of the sodium hydroxide solution.
the bayer process is the principal industrial means of refining bauxite to produce alumina (aluminium oxide) and was developed by carl josef bayer. bauxite the most important ore of aluminium contains only 30–60% aluminium oxide (al 2 o 3) the rest being a mixture of silica various iron oxides and titanium dioxide.
the hall–héroult process is the major industrial process for smelting aluminium. it involves dissolving aluminium oxide (alumina) (obtained most often from bauxite aluminium 39;s chief ore through the bayer process) in molten cryolite and electrolysing the molten salt bath typically in a purpose-built cell.
carbon steel is a heating element which carries the heat evenly to all parts of the cooking utensil and in the process prevents hot spots. i use both conventional and waterless. both do what i need. i can spend $2500 at ws on a full set of all clad d5 (more with the copper core); i can spend the same amount on salad master or 360 cookware
aluminium alloys. the process where the aluminium is shaped to its required form. this process is used for making the vast majority of aluminium products from spectacle frames telephone bodies aeroplane fuselages or spaceship bodies. the malleability of aluminium means it can be easily rolled into thin sheets.