Haematite= Fe2O3 Magnetite=Fe3O4 Iron pyrites=FeS2 Bauxite=Al2O3 Rutile=TiO2 Ilmenite=FeTiO3
1 of 15
What are the conditions for the extraction of iron?
up to 2000 degrees, Coke as a reducing agent, hot air through tuyeres as a catalyst
2 of 15
How is Steel made?
using the BOS process where molten pig iron, scrap steel and calcium oxide are blasted with oxygen through a water-cooled oxygen lance, then the steel is tapered off
3 of 15
Why is aluminium extracted using electrolysis?
It will not be reduced by carbon
4 of 15
How does elecrolysis work?
Bauxite is purified with NaOH, it's then dissolved in a cryolite catalyst to reduce the melting point (saving money). The mixture is then electrolysed in a cell with graphite anodes and cathodes
5 of 15
What are the half equations for the electrolysis of bauxite?
2O2- -> O2 + 4e- and Al3+ + 3e- -> Al
6 of 15
Why can't Titanium and tungsten be reduced using carbon?
carbides are formed which make the metal brittle
7 of 15
How is titanium extracted?
Titanium oxide is reacted with chlorine to produce titanium chloride. Mg or Na is then used to displace the titanium, producing Ti and MgCl2
8 of 15
what are the equations for the extraction of titanium?
What are the advantages and disadvantages of reduction with carbon?
very cheap, but some metals are too reactive and can produce brittle carbides
10 of 15
What are the advantages and disadvantages of reduction with metals?
very expensive, but will produce a pure product
11 of 15
What are the advantages and disadvantages of electrolysis?
produces a very pure product, but is expensive because of energy consumption
12 of 15
What are the uses of extracted metals?
Iron-widely used because of low cost, Aluminium-cooking foil, drinks cans, aeroplane parts, Titanium- aircraft alloys, missiles, car engines(very strong and low density(cheap))
13 of 15
What are the problems related to pollution?
CO produced is poisonous, but is burnt during the extraction process, CO2 contributes to global warming, SO2/NO cause acid rain, Fine dust is produced in Al extraction which forms red mud
14 of 15
Why is recycling used instead of metal extraction?
saves money, reduces litter(/pollution) and solves the issue of declining resources
15 of 15
Other cards in this set
Card 2
Front
What are the conditions for the extraction of iron?
Back
up to 2000 degrees, Coke as a reducing agent, hot air through tuyeres as a catalyst
Comments
No comments have yet been made