Metals in industry

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Slide 1

Metals in Industry, working with metals

Slide 2

Iron and Steel

In previous work we considered the role of the blast furnace in extracting iron from its ore.

Slide 3

Making steel – the reactions

1) Mixing oxygen with silicon impurities:

2) Decomposition of limestone:

3) Adding these products together:

Slide 4

Titanium

Titanium is a strong metal used in planes, replacement hip joints, bikes etc. Two steps are used in its manufacture:

Step 1: Convert titanium dioxide (ore) to titanium chloride

Step 2: Displace the titanium using sodium or magnesium:

Slide 5

Aluminium

Aluminium is a fairly reactive metal that doesn’t corrode due to forming a thin layer of aluminium oxide. This explains why greenhouses don’t rust and don’t need to be painted.

A thicker layer of aluminium oxide can be made artificially. There are two stages:

1) Remove the natural layer by placing the aluminium in sodium hydroxide.

2) Use electrolysis on sulphuric acid with the aluminium as the positive electrode. This is called anodising.

Slide 6

Electroplating

Solution containing silver ions