Landela izakhi ku-petroleum coke ikakhulukazi i-Fe, i-Ca, i-V, i-Na, i-Si, i-Ni, i-P, i-Al, i-Pb njalonjalo. Ihluka ngenxa yalokho umthombo kawoyela wefekthri ehluza uwoyela, ukwakheka kwezakhi zokulandelela kanye nokuqukethwe kunomehluko omkhulu kakhulu, ezinye izici zokulandela umkhondo kuwoyela ongahluziwe zibe, njenge-S, V, futhi isesimweni...
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