Aluminium and Titanium

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Presentation transcript:

Aluminium and Titanium

Learning Objectives To be able to recall properties and uses of aluminium and titanium To be able to describe the process of aluminium extraction To be able to explain why the extraction of aluminium and titanium are so expensive

Starter Activity – Key Word Bingo Reduction Reactivity Series Ore Electrolysis Carbon Hydrogen Native State Haematite Bauxite Alloy Blast Furnace Steel

Al2O3 – Bauxite (Aluminium oxide) What is the chemical name for Bauxite? How many elements are in Bauxite- name them? How many atoms in Bauxite? How is Bauxite bonded? (Ionic, Covalent or Metallic) What do we call compounds such as Bauxite, where there is a decent amount of the metal to make it worth extracting? 5 minutes

Extraction of Aluminium We extract aluminium using electrolysis as it is more reactive than carbon An electric current is passed through MOLTEN aluminium oxide at high temperatures to break it down Electrolysis is very expensive High temperatures are required so a great deal of electricity is required Environmental issues arise due to the amount of energy required Referring to the reactivity series, how do we extract aluminium?

Extraction of Titanium We can displace it from its oxide using carbon, it reacts with titanium making it very brittle Therefore we use a more reactive metal for extraction, Sodium or Magnesium However sodium and magnesium have to be extracted using electrolysis Before titanium displacement can occur, titanium oxide is converted to titanium chloride Chloride is distilled to purify it, then titanium can be displaced using sodium or magnesium This is a very costly process due to all the steps Titanium is not a very reactive metal, how do you think we extract this?

Video Highest recycling potential of all recyclable materials http://www.youtube.com/watch?v=RX14rA-tylo&list=PLD2C43638C526D33F&index=6 Video Highest recycling potential of all recyclable materials 1kg of recycled Aluminium saves 8kg of bauxite, 4kg chemical products, 14 kilowatt-hours electricity Recycling 1 aluminium can will run a TV for 3 hours Recycling rate of 90% Watch the video and write down key data relating to the recycling of aluminium

Question 5 set Exam Questions (You may need a textbook) Activity Complete ‘Uses and Properties’ Worksheet Produce a PERSUASIVE poster encouraging people to recycle aluminium EXTENSION Question 5 set Exam Questions (You may need a textbook)

Plenary Sort into Aluminium and Titanium Bicycles Racing Bikes Replacement Joints Drinks Cans Saucepans Jet Engines Aeroplanes Cooking Foil High Performance Aircrafts Nuclear Reactors