Landela izinto kwi-petroleum coke ikakhulu i-Fe, Ca, V, Na, Si, Ni, P, Al, Pb njalo njalo. Ukwahluka ngenxa yoko umthombo we-oyile wokucoca i-oyile, umkhondo wokwakheka kunye nomxholo unomahluko omkhulu kakhulu, ezinye izinto zomkhondo kwi-oyile ekrwada zibe, njenge-S, V, kwaye ikwiproc...
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