Method for producing ferroalloy containing nickel
AssigneeOutokumpu Oyj
InventorsTuomo MÄKELÄ, Pekka NIEMELÄ
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for producing a ferroalloy containing nickel. From a fine-grained raw material containing iron and chromium and a fine-grained raw material containing nickel, a mixture is formed with binding agent, the mixture is agglomerated so that first formed objects of desired size are obtained. The objects formed are heat treated in order to strengthen the objects so that the heat treated objects withstand conveyance and loading into a smelter furnace. Further, the objects are smelted under reducing circumstances in order to achieve ferrochromenickel, a ferroalloy of a desired composition containing at least iron, chromium and nickel.
Claims23
A method for producing a nickel containing ferroalloy, comprising:
- forming a mixture of a raw material containing iron and chromium, a raw material containing nickel, and a binder material,
- agglomerating the mixture to form objects having a desired size,
- heat-treating the objects at a temperature sufficient for removal of water of crystallization bound in the raw material, whereby the raw material containing nickel is calcinated and the objects are strengthened so that the heat-treated objects are conveyable, and
- smelting the objects under reducing conditions in order to produce ferrochromenickel containing chromium and nickel in a ratio between 1.5 and 5,
- and wherein the raw material containing iron and chromium supplies substantially all the iron and chromium in the ferrochromenickel.
Dependencies are inferred from the claim text.