|
The DON process is a shorter and more flexible version of the early nickel flash smelting process chain. It was first put to commercial use in 1995 in Harjavalta, Finland. In developing the DON process our target has been the elimination of the Peirce-Smith batch operation.
The continuous DON process saves both capital and operational expenditures in the smelter and the acid plant. In addition, the flexibility to treat a wide range of raw materials brings additional saving opportunities as well.
Suitable for high grade matte production, the DON process enables high recovery of nickel and copper, since there is no unnecessary internal material circulation. In addition to cost benefits, the working conditions are improved by the elimination of the expensive converter aisle ladle transfer of molten material.
Sulfur capture cost and emissions to the environment and the work place are also minimized, thanks to the high sulfur fixation from the continuously high SO2 gas flow.
The Fortaleza smelter in Brazil began nickel production with the DON process in 1998. Using the DON process, operating and capital costs can be reduced drastically.
The dominating smelting method
Flash Smelting has an impressive track record. Already 30% of the world’s nickel production from sulfide concentrates are based on Outotec Flash Smelting. In terms of capital expenditure and operating costs, Flash Smelting is a highly attractive choice.
The well-proven flash smelting process has been continuously developed over the decades. With improved efficiency and higher oxygen enrichment, a modernization of an old smelter can result in a 2- to 3-fold increased capacity with a relatively small investment.
For further information, please contact  pyro(at)outotec.com
|