Okuqukethwe Okuphansi Komlotha Nesulfure: Inqubo yokubala i-calcination inciphisa okuqukethwe komlotha nesulfure ku-petroleum coke, okwenza ifaneleke ukusetshenziswa okudinga amazinga aphansi okungcola. Okuqukethwe okuphansi kwesulfure kubaluleke kakhulu ekwenzeni insimbi, njengoba kusiza ukunciphisa ukukhishwa kwemvelo nokuthuthukisa ikhwalithi yomkhiqizo;