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The Metal
To produce 1 kilogram of metal 12 kilograms of materials are used (iron ore, explosives, natural gas, anthracite, limestone, coke, etc.), 91 kg of water and 1,9 kg air.
The iron is extracted from iron ore, most often from hematite. During its extraction from the ore there is 3,5 – 4,5% carbon which makes it hard but fragile. When the level of carbon is below 2% the steel is produced. That is more flexible as material. This happens when the iron is melted and air is put in it. To produce 1 kg of steel less primary materials are used – 8, 9 kg, water – 59 kg and air – 530 gr.
About 55% from the iron and the steel that we use today are recycled. To produce recycled steel the used quantities of water and air are
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