IGCSE Chemistry Revision - 24 - Extraction of Aluminium

This video goes into detail about the preparation and electrolysis for the extraction of aluminium from the initial natural resource bauxite.

In addition, I also discuss the economic and environmental issues that relate to this process and hence show the importance of recycling aluminium.

Timestamps:
0:00 Introduction
1:32 Bauxite (raw ingredient)
2:30 Why electrolysis? - Reactivity Series
3:06 Electrolysis Methods
3:24 Step 1 - Sodium Hydroxide Treatment
4:05 Step 2 - Precipitation
5:02 Step 3 - Formation
5:45 Step 4 - Electrolysis
9:15 Step 4 - Economic Considerations
11:16 Key Equations

I hope you enjoy this video and goodluck on your revision!

[SimpleScienceProductions]

I'm very very sorry for saying "Aluminium Hydroxide" instead of "Aluminium Oxide" multiple times in the 3. Formation slide at 5:23, so beware of my mistake. However, THE SLIDES ARE CORRECT. Please forgive me 3: - Nhan

[millie]

Hope this helps this is basically a summary of what goes on in the extraction of aluminium from the bauxite. Xx
1. Aluminium oxide is dissolved in molten cryolite
2. Graphite casing inside metal casing (cathode)
3. Aluminum (Al^+3) attracted to the negative cathode and gains electrons Al^+3 +3e ---> Al (reduction)
5. Aluminium sinks because it's more dense.
6. Oxygen forms at the anode
7. Carbon also forms there making CO2
Overall in the electrolyte:
2Al2O3--->4Al+3O2

[ayaalmanfud]

During oxidation at 8:12 wouldn't oxygen require 4 electrons since its diatomic?

[cookiesandcream]

At 8:06 you said that at the cathode the Oxygen ions will be oxidized? But doesn't oxidation take place at anode??

[sarwarn]

I don't think in industrial process they do purification process (steps 1, 2 and 3). The aluminium oxide is already exist in the raw mineral. The steps 1, 2 and 3 add more cost to the process especially the heating process in step 3.

[mariahassan]

you also said cathode instead of anode at 8:02

[BenitaOFlade]

NaAl(OH)4 is called Sodium aluminate(lll).

[mariamhaddad]

Is this both tha Bayer and Hall-Herault process?

[gullafshan]

The vedio was well prepared but the subtitles didn't let me read the equations below them ....so plz don't add subtitles or make another way for subtitles so that we may read the equations as well

[toph]

It's really good its just that you keep touching your mic with your lip and it changes the volume of your voice, so please try not to do that in the next video, thanks

[bharatsonawane]

Kitha boot karte hi bhai, Kuch nhi dimag me ghusa . Bhai electrolysis last me hota hai, tune pehela he kar diya