Method and apparatus for manufacturing high-grade nickel matte
CA 2008167 C · Owner: Hanniala, Pekka · Inventors: Hanniala, Pekka; Asteljoki, Jussi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method and apparatus for manufacturing high-grade nickel matte. In the method of the invention comprises, a concentrate under treatment together with flux, recirculated flue dust and oxidizing gas is fed into a suspension smelting furnace. In the suspension smelting furnace there is formed slag and highgrade nickel matte. At least the slag from the suspension furnace is conducted into an electric furnace where it is reduced, in the presence of a reducing agent so that the electric furnace slag and metallicized matte are formed and at least part of the metallicized matte from the electric furnace is returned as feed to the suspension smelting furnace. The apparatus …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed January 19, 1990 and granted December 3, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 19, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.