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Aluminum Recycling

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by

Dianna Jacinto

on 3 December 2013

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Transcript of Aluminum Recycling

Aluminum Recycling

What is it?
By definition:
Aluminium recycling is the process by which scrap aluminium can be reused in products after its initial production.
Where is it Used?
The process of recycling aluminum has been used everywhere through out the world and has changed the lives of many
In North America it has become a good habit that has helped improve our eco foot print
People in India see recycling as a lifeline, where plant workers from the US reduce health risks for residents.
History
Who discovered Aluminum?
Hans Christian Orsted isolated the first very tiny amount of aluminum metal in 1825
Named the element "alumium"
Henri Deville produced a bit of aluminum by experimenting with electrochemical cells
Heated aluminum and sodium chloride
This lead to four tons of aluminum being produced annually by 1884
Charles Hall and Alcoa
In 1885 he discovered the electrolytic process to produce aluminum
Found financial bankers to form the Aluminum Company of America, "Alcoa"
His professor had said "Any person who discovers a process by which aluminum cans be made on a commecrial scale will bless humanity and a fortune for himself"
Redox Reaction
2Al O + 3C 3CO + 4Al
Bauxite Extraction
At high temperatures, Bauxite (consists of aluminum oxide) is dissolved in a solution of sodium hydroxide and water
This produces sodium aluminate
Residues are then removed when they gradually sink to the bottom
How Does it Work?
Paul Héroult
In 1886, he discovered the electrolytic reduction process for aluminum
Why is This Important?
Fun Facts
Half-Reaction Method
There is no limit to the number of times aluminum can be melted down and reused
75% of all aluminum produced in the 1880's is still in use today
In the beginning there was little production due to it being costly which meant little recycling
The Hall-Héroult process made it easier and brought the wages down from $12 a pound to about $0.75!
Alumina Refining
The sodium aluminate solution is pumped into a huge tank and cooled
This solution decomposes as it cools to form aluminum hydroxide and sodium hydroxide
Aluminum hydroxide forms a precipitate that sinks to the bottom of the tank and is removed.
Primary Smelting
Aluminum hydroxide is heated which forms aluminum oxide
This aluminum oxide then goes to a process known as electrolysis where they seperate aluminum and oxygen
Then you have aluminum!
Takes 80-100 years for aluminum to decompose
Why not just take advantage of aluminums ability to be infinitely recycable?
Aluminum can be recycled into soda cans, pie plates, thumb tacks, license plates, aluminum foil, etc.
2
3
2
+3
-2
0
+4
-2
0
Oxidized Lost 4 electrons x3
Reduced Gained 3 electrons x4
LEO: Carbon (C) Reducing Agent
8Al O + 9C 9CO + 16Al
2
3
2
GER: Aluminum (Al) Oxidizing Agent
There are 3 stages
AlF + 12e Al + 6F
C + 2Al OF + 12F CO + 4AlF + 12e

6
-
3-
-
2
6
-
-
6
2
+
2Al O + 3C 3CO + 4Al
By: Dianna Jacinto
Cathode
Anode
2-
2
3
2
Overall net reaction
overall net reaction
final equation!
Fun fact: the setup I have here forms an aluminum molecule
Al
Al
Cl
Cl
Cl
Cl
Cl
Cl
Full transcript