Process for removal of harmful impurities from metallurgical sulphide melts
AssigneeOutokumpu Oy
InventorsJuho K. Makinen, Kaarina M. E. Kaenniemi
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Abstract
A process for the removal of harmful impurities, particularly arsenic, antimony, bismuth and lead, from metallurgical sulphide melts, in which the sulphide melt is sulphurated before conversion, during the slag-blowing stage or after it before the blister-blowing stage, and the melt is refined with nitrogen or other inert gas during sulphuration and possibly after it, so that the amount of sulphur supplied to the sulphide melt is at least 10% in excess of the stoichiometric sulphur amount as calculated from the sulphur requirement of the principal components of the melt.
Claims10
A process for the removal from metallurgical sulphide melts of harmful impurities selected from the group consisting essentially of arsenic, antimony, bismuth and lead, comprising sulphurating the sulphide melt in an inert gas atmosphere by feeding into the melt a sulphur containing agent in an amount such that the sulphur supplied to the sulphide melt is at least 10% in excess of the stoichiometric sulphur amount as calculated from the sulphur requirement of the principal components of the melt.
Dependencies are inferred from the claim text.