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US 5,492,554 AGranted
Method for producing high-grade nickel matte from at least partly pyrometallurgically refined nickel-bearing raw materials
AssigneeOutokumpu Engineering Contractors Oy
InventorsPekka Hanniala, Risto Saarinen, Olli Saarinen
Life of this patent
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Abstract
The invention relates to a method for producing high-grade nickel matte and slag in a combination of a suspension smelting furnace and some other furnace without charge-type converting, so that at least part of the concentrate and/or ore fed into the process is first refined pyrometallurgically into nickel matte, which then is fed into the suspension smelting furnace, where the high-grade nickel matte proper is produced.
Claims16
A method for producing high-grade nickel matte from a raw material containing nickel sulfide concentrate comprising the steps of:
- (a) refining at least part of the raw material in a pyrometallurgic furnace (III) in the presence of flux to produce nickel matte;
- (b) feeding the nickel matte produced in step (a), together with flux, flue dust, additional fuel and oxygen-enriched air as feed materials into a suspension smelting furnace (I);
- (c) treating the feed materials fed into the suspension smelting furnace in step (b) in the suspension smelting furnace to form high-grade nickel matte and slag;
- (d) conducting the high-grade nickel matte formed in step (c) to a hydrometallurgic treatment process;
- and
- (e) processing slag formed in step (c) in a pyrometallurgic furnace in order to recover metals therefrom.
3 more elements
Dependencies are inferred from the claim text.