ekk, metal production?

(this is soo chemically sick ahaha)

production of Aluminium from Aluminium ore
(the hardest part to memorize in metal production!! wekk!)

Aluminium minerals contains impurities - Al2O3, SiO2, Fe2O3

Crusher:
to increase surface area for higher rate of reaction

Digester:
dissolved with hot caustic soda (NaOH) - Na2SiO3, NaAlO2, Fe2O3

Filter 1:
discard red mud (Fe2O3)

Precipitate:
add H2O & seed crystal of hydrated alumina
2NaAlO2 + 4H2O ---> Al2O3.3H2O + 2NaOH

Filter 2:
separate hydrated alumina from Na2SiO3

Rotary kiln:
Calcination > roasting of hydrated alumina = powder (anhydrous alumina Al2O3)

Electrolytic reduction:
electrolyte > alumina dissolved in molten cryolite (eg: Na3AlF6)
electrodes > graphite (replaced periodically - electrodes burnt away)
anode [o]: 2O2- ---> 4e- + O2
cathode [r]: Al3+ + 3e- ---> Al
overall: Al2O3 ---> 2Al + 3/2O2

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^_^ i was suggested by daniel to blog about chemistry since i'm awake for blogging BUT will certainly be falling asleep if i read chemistry notes haha...quite a good idea though! got it almost perfect now, whee~


p/s: did not refer to any chem books OK!~


....


fine! i lied! i peep the book a bit =P