Production method for medium-silicon low-carbon low-phosphorus manganese block ferroalloy

Abstract

The invention relates to a production method for medium-silicon low-carbon low-phosphorus manganese block ferroalloy. The production method for the medium-silicon low-carbon low-phosphorus manganese block ferroalloy comprises the following steps that 1, undersize powder is added into a property-improving furnace, after the property is improved through the property-improving furnace, a liquid low-carbon manganese silicon intermediate alloy is obtained; 2, furnace front hot charging is selected for liquid manganese slag which is a byproduct in the electric furnace smelting process of a high and middle low-carbon ferromanganese, and the liquid manganese slag and the liquid intermediate alloy from the property-improving furnace are successively added into a shaking ladle; 3, the shaking ladle is started to revolve, a liquid alloy with medium silicon, low carbon, low phosphorus and high manganese and slag with very low manganese are obtained; 4, the liquid alloy with the medium silicon, the low carbon, the low phosphorus and the high manganese obtained in the step 3 is directly poured with an ingot mold, and a medium-silicon low-carbon low-phosphorus manganese block is obtained, or the liquid alloy is returned to a refining furnace for hot charging; 5, after furnace discharging from the refining furnace is conducted, manganese ore and lime are added first, preheating is conducted, then hot charging is conducted on the liquid alloy with the medium silicon, the low carbon, the low phosphorus and the high manganese, the temperature is risen to 1350-1550 DEG C, and low-carbon ferromanganese or electric furnace metal manganese is refined and deeply processed; and 6, continuous production with a submerged arc furnace is conducted, and intermittent production with the refining furnace is conducted.

Description

Technical field [0001] The invention relates to a production method of a medium-silicon, low-carbon and low-phosphorus ferromanganese lump ferroalloy, in particular to a smelting manganese-based alloy to refine the sieve powder, improve the quality and remove impurities, and then combine it with high, medium and low carbon ferromanganese smelting residue A method for producing a medium-silicon, low-carbon, low-phosphorus and manganese block ferroalloy by a hot charging and shaking bag process belongs to the technical field of scrap and secondary material improvement and efficiency improvement and comprehensive utilization of industrial waste. Background technique [0002] Medium-silicon, low-carbon and low-phosphorus manganese block is a new type of steelmaking deoxidizer and alloy additive. In addition to having all the functions of manganese-silicon alloy, it can also replace low-carbon ferromanganese or even electric furnace metal manganese in the steelmaking process; It can a...

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Problems solved by technology

The third method is to use the submerged arc furnace to produce directly in one step. To make C≤0.2%, Si≥25% must be above, and Mn<65%, which leads to the fact that it cannot produce alloys that meet the requirements of the bidding document.

At the same time, in the prior art, there are still some methods of adding finishing powder to prepare medium-silicon, low-carbon, low-phosphorus manganese block ferroalloys, but the number of products obtained is limited, and the composition is also extremely unstable.

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