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Željezna ruda

Izvor: Wikipedija

Željezna ruda
Hematit najčešća ruda u Brazilu
Hematit najčešća ruda u Brazilu
Hematit najčešća ruda u Brazilu

Željezna ruda je ime za stijene i minerale iz kojih se željezo kao metal može ekonomično vaditi. Te rude su obično bogate željeznim oksidima i variraju u boji od tamno sive, svijetlo žute, tamno ljubičaste do zagasito crvene.

Karakteristike

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Prirodna legura željeza - Nikl-željezo, kog ima po zemaljskim nalazištima, sadrži od 21-64 % željeza i 77-34 % nikla, u meteoritima kao što je taenit ima čak 62-75 % željeza i 37-24 % nikla.[1]

Meteoriti se klasificiraju prema svom relativnom udjelu željeza i silikata i ostalih minerala na; željezo, željezni kamen ili kamen.[1] Željeza također ima u kombinaciji s drugim elementi i u stotinama drugih minerala; ali su od najveće važnosti kao željezne rude;

Magmatske stijene prosječno sadrže oko 5 % željeza. Metal se iz rude izdvaja taljenjem sa ugljikom (koks i vapnenac).[1]

Izvori

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  1. 1,0 1,1 1,2 1,3 1,4 1,5 1,6 Iron (Fe), Chemical element (engleski). Encyclopædia Britannica. Pristupljeno 08. 03. 2016. 

Vanjske veze

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Željezna ruda
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