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U konvertor se prvo dozira komadasti kvarc, na koji se uliva rastopljeni bakarni kamen, pa se zatim produvava sa vazduhom, koji energino meajui bakarni kamen oksidie sulfide bakra i eleza: 2FeS + 3O2 = 2FeO + 2SO2 + 940.000 J2Cu2S + 3O2 = 2Cu2O + 2SO2 + 775.000 J Pri tome kupro oksid (Cu2O) reaguje se FeS i ponovo prelazi u sulfid:
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