METHOD FOR PRODUCING FERROMANGANESE WITH ULTRA-LOW CONTENT OF PHOSPHORUS AND CARBON AS RESULT OF USING FERROMANGANESE SLAG Russian patent published in 2012 - IPC C22C33/04 C22B7/04 

FIELD: metallurgy.

SUBSTANCE: invention may be used to produce ferromanganese with a ultra-low content of phosphorus and carbon, containing 0.1 wt % or less of carbon and 0.03 wt % or less of phosphorus. The method includes obtaining low carbon silico-manganese, which has a low content of phosphorus, obtaining molten manganese slag, the first blending and mixing of the molten manganese slag and of low carbon silico-manganese, which has a low content of phosphorus, with a ratio equal to 70-72:28-30 in the ladle, to produce metallic melt and slag, and the second blending and mixing of molten metal, separated from the above-mentioned slag and molten manganese slag identical to the slag used for the first blending and mixing used for obtaining of slag and molten metal, consisting of 91-93 wt % of manganese, 0.60-0.85 wt % of silicon, 0.05-0.10 wt % of carbon and 0.015-0.02 wt % of phosphorus.

EFFECT: invention can effectively be used in the production of ferromanganese, previously not used materials - ferromanganese production slag with a high carbon content, from which manganese slag is obtained and dephosphorised silicon manganese as a reducing agent for the desiliconisation reaction.

7 cl, 3 ex, 5 tbl