Transcript C1a Rocks and Metals

C1a Rocks and Metals
2.2 Extracting Iron
Learning objectives


Understand which metals can be extracted using
carbon
Be able to describe how a blast furnace works
What do you understand?
1
2
3
4
5
6
7
8
9
I know nothing
I am an
expert
 How would you rate yourself when thinking about
extraction of metals?
10
The Reactivity
Series
Increasing reactivity
potassium
sodium
calcium
magnesium
aluminium
The reactivity of a
metal determines the
method of extraction.
Metals above carbon
must be extracted using
electrolysis.
(carbon)
zinc
iron
lead
copper
silver
gold
Metals below carbon
can be extracted from the ore
by reduction using carbon,
coke, or charcoal.
Gold and silver often do not need to
be extracted. They occur native.
Iron age


Iron – 2nd most common metal in the Earth’s
crust
Found as haematite
Iron (III) oxide (Fe2O3)
 Sand


Can be obtained using a blast furnace
Reduction of iron ore
carbon + oxygen  carbon dioxide
Carbon dioxide + carbon  carbon monoxide
Carbon monoxide + iron oxide  iron + carbon dioxide
Removing impurities
Calcium carbonate  calcium oxide + carbon dioxide
Calcium oxide + silicon dioxide  calcium silicate
This is called SLAG
Summary of the process





Iron is not found naturally, but in Iron Ore
We can extract iron form iron ore using a Blast
Furnace
Using chemistry we can produce pure iron
Limestone (CaCO3) is used to remove
impurities
Coke/Carbon gives us the high temperature
we need for the reactions to take place
Learning outcomes




Why can some metals be extracted using carbon
when some can’t?
What do we use to extract iron?
How does a blast furnace work?
What chemical reactions take place?
Extraction of Iron