How is auminum extract from bauxite?

Answer 1

Bauxite is hydrated aluminum oxide, mixed with sand and a few other things.

You first crush the bauxite and put it in heated sodium hydroxide solution. This dissolves the silicon oxide and aluminum oxide; the other impurities fall to the bottom of the container and are filtered out.

Next, bubble carbon dioxide through the solution. This neutralizes it, and causes the aluminum oxide to fall out of solution. Filter it and dry the aluminum oxide.

You next need cryolite - sodium fluorite plus aluminum fluorite. Mix it with the aluminum oxide, heat it up to melting, pour it into an electrolysis pot, insert a carbon anode, and apply 5 volts at 150,000 amps - I'm not kidding, that's how much power it takes. The aluminum will sink to the bottom and flow out a hole in the bottom of the pot. When it stops flowing, you replace the anode - they don't last long - scrape out the junk, refill the pot and go back to work.

Answer 2

High temperatures of about 800°C/1,470°F) are required to melt the ore . Electric currents are then passed through the molten ore.

Answer 3

Al2O3xH2O(s) + 2 OH¯(aq) 2 Al(OH)4¯(aq) + (x­3) H2O(l)

heat

2 Al(OH)3(s)

Al2O3(s) + 3 H2O(g)

Answer 4

Aluminium is an element in its own right so therefore is not created by a chemical reaction

Answer 5

Aluminum ore (bauxite) is melted and a strong electric current is passed thru it. Electricity cost is a major component of the cost of aluminum.

Answer 6

The reaction at the cathode in aluminum extraction is:

Al+3 + 3 e- => Al.

Answer 7

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