Uddeholms Aktiebolag

Per-Ake Lundstrom

Lars-Gunnar Norberg

M K Johnsson

Rune H Lindstrom

A process for the production of ferro alloys containing manganese, chromium, molybdenum, and small amounts of carbon is provided. To a converter having a previous product melt and a slag rich in oxides of chromium or manganese is added a reducing agent having an excess of silicon or aluminum. Fluid is injected into the melt to create intensive agitation of the melt, slag and reducing agent, whereby the oxides in the slag are reduced. Lime is added to fix the resulting silicoc acid or aluminum oxide, and the slag with reduced chromium or manganese content is removed from the converter. Injection into the melt of a pulverulent oxide concentrate of chromium or manganese is continued, with additional lime, until the excess of silicon or aluminum in the melt, supplied by the reducing agent, reduces the injected oxide concentrate and the chromium and manganese are oxidized and go into the slag. The resulting product is partially tapped from the converter and the process is repeated.

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Hagfors, Sweden

Per-Ake Lundstrom