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 قسمتی از متن .ppt : 

The Blast Furnace

By Chan, Sam and Elly

What is a Blast Furnace?

The purpose of a blast furnace is to reduce and convert iron oxides into liquid iron called "hot metal".

The blast furnace is a huge, steel stack lined with refractory brick.

Iron ore, coke and limestone are put into the top, and preheated air is blown into the bottom.

Why does Iron have to be extracted in a Blast Furnace???

Iron can be extracted by the blast furnace because it can be displaced by carbon.

This is more efficient method than electrolysis because it is more cost effective