Aluminum production
Presentation
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Chemistry, Science
•
10th Grade
•
Practice Problem
•
Hard
Okapi Zebraffe
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10 Slides • 10 Questions
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Aluminum production
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Multiple Select
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Multiple Select
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Poll
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Mining bauxite
its ore, bauxite (colour from an impurity) is
often dug out of the ground in open-cast mines. The ore contains hydrated aluminium oxide: reffered as Al2O3·xH2O – or sometimes Al(OH)3 - Al2O3 mixture or AlO(OH).
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Fill in the Blanks
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Poll
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Preparatory steps - physically
crushing
milling
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Separation from impurities
hot concentrated soda lye
conversion of oxide into sodium tetrahydroxo aluminate (Na[Al(OH)4])
Al2O3 + H2O + NaOH = Na[Al(OH)4]
Al(OH)3 + NaOH = Na[Al(OH)4]
AlO(OH) + NaOH + H2O = Na[Al(OH)4]
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Multiple Choice
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Poll
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Separation from impurities
removal of impurities
red mud
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RED MUD
a mixture of solid and metallic oxides
red colour arises from iron oxides (up to 60w%)
pH= 10-13
silica, unleached residual alumina, and titanium oxide.
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Multiple Choice
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Separation from impurities
extreme dilution
against equlibrium system of Na[Al(OH)4]
Na[Al(OH)4] -> Al(OH)3 + NaOH
precipitation
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Multiple Choice
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Getting alumina
alumina (timföld) Al2O3
purification of Al2O3 .x H2O into Al2O3
ready for electrolysis?
The melting point of alumina Al2O3 is 2050°C.
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Multiple Choice
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Smelting - preparatory steps
Cryolite is added (Na3AlF6) to decrease the melting point below 1000°C.
1886 Charles Martin Hall and Héroult
In 1888, Hall opened the first large-scale aluminium production plant in Pittsburgh (later became the Alcoa ).
Hall–Héroult process
Al2O3→ Al + O2
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Aluminum production
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