CS296 Doc No. The Outokumpu flash smelting process combines the conventional operations of roasting, smelting and partial converting into one process. Preheated oxygen-enriched air is used to provide heat such that additional fuel is not required for the reactions to proceed.
Copper concentrate is recovered from the slag and recycled through the smelter.
The clean slag is sent for disposal. Heat and dust are recovered from the smelter gases producing dust for recycle to the smelter, and SO2 gases for production of sulfuric acid. The matte is further treated in conventional converters to obtain blister copper.