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Transcript of Aluminum Recycling
Structure Aluminum and other products can be easily recycled but the expenses surrounding that idea can be overwhelming, recycling these products saves money as well as energy. The Product Benefits of Recycling Aluminum Recycling By Damian & Sujith City in Mumbai that homes over 14 billion people. (12000 people per acre)
Low class society surprisingly recycles 80% of the city's garbage.
Whole community devoted to one industry increasing job opportunities for the homeless. The Mega City The Slums of Dharavi Small network of home based interactive factories The Modern Day Bayer Process A Way of Living
A Livestyle? Resources Why recycle aluminum? Profitable because extracting aluminum from oxide ore is expensive.
Refinement of Bauxite ore extracts pure aluminum from within. (Bayer Process)
Recycling is much cheaper and environmentally friendly. Condensed Recycled Aluminum Mixture and filtration As the aluminum oxide journeys through the electrically impulsive furnace, the rods emit pressure which reconstructs the chemical structure of the aluminum oxide and cryolite passing through, each rod it charged positively and negatively.
Meaning they give and consume electrons, however the anodes are made of carbon which allows the fusion of CO2 to begin from the excess oxidation. The anodes give off the excess electrons which stabilizes the compound and allows the aluminum to exist in its pure form without the fluorine bonding. Collecting for a Living Trash can be found almost everywhere in the streets of Dharavi.
Its collected by local vendors to be sufficiently disposed of.
Each "home factory" consists of its own aluminum deconstructive machinery. Recycled aluminum is collected and soaked in acid.
Its later crushed and refined for further decomposition. Dharavi Technique Dharavi Technique Cont. 2 As the neutralized aluminum have been soaked clean of foreign substances, Its thrown into 'Home-made' furnaces, where the aluminum is melted and poured into molds where it can be reused. The 'Pre-Product' The molten aluminum is carefully crafted into ingots to be used in the manufacturing of aluminum products. The collected aluminum is dissolved in Sodium Hydroxide. (NaOH)
As the Sodium Hydroxide purifies the product, it leaves residue behind like iron and silicon.
-Al2O3 + 2NaOH + 3H2O 2NaAl(OH)4-
The sodium aluminate is pumped into another tank where it is allowed to cool, this initially starts the decomposition stage of the process.
The sodium aluminate breaks down into aluminum hydroxide and sodium hydroxide.
-NaAl(OH)4 Al(OH)3 + NaOH-
The Final stage is for evaporation. The residou collected from the last step was the aluminum hydroxide at the bottom of the tank. Its heated to 980 degree which evaporates the hydrogen and leaves only aluminum oxide. Bayer Process Part 2 Electrolysis This is the second half of the Bayer Process, where the molecules of the product are divided into two different compounds.
This technique is called electrolysis, where the compound is stripped to its bare bone. This process decomposes Aluminum oxide to just aluminum and oxygen.
This can only occur in a liquid, and since aluminum oxide doesnt dissolve easily its mixed in with cryolite. (Na3AlF6) The different ions have opposite magnetic pulls which is the base for electrolysis.
Al2O3 + (4Al6)3- --> (3Al2OF6)2- + 6F- The Finished Product Here we have reached the final step in the extraction process.
As the molten aluminum is collected from the tank, its cooled and molded into ingots that can be used in many ways.
Example: Most ingots are pressed down so they are less then a inch thick so they can be sent to soft drink companies to be made into soda cans again. Recycling reduces the amount of waste that needs to be burned or buried.
Recycling comes with an economic advantage as well as a environmental one. This has been Aluminum Extraction and recycling