Process Description of Medium And Low Carbon Ferromanganese Production by DC Refining Electric Arc Furnace

April 12, 2024

The relatively mature process for producing medium and low carbon ferromanganese is the electrosilicothermal method. The production of medium and low carbon ferromanganese by electro silicothermal method is achieved by reducing manganese ore with manganese silicon alloy in a DC refining electric furnace, which is currently the main method for smelting medium and low carbon ferromanganese. The carbon content of the medium and low carbon ferromanganese produced depends on the carbon content of the manganese silicon alloy, with very little carbon entering the alloy from the electrodes and raw materials. Due to the different states of furnace materials, they are divided into two forms: hot charging and cold charging. The hot charging method is as follows: the silicon manganese iron produced in the previous workshop does not need to be cast, but can be directly transported to the refining workshop of this project using a tractor, and then poured into the refining electric furnace using a crane to start producing medium and low carbon manganese iron. The cold charging method is to crush the finished block shaped silicon manganese products that have been cast, add them to the refining electric furnace of this project, melt them first, and then smelt them.

If the owner has already built a manganese silicon electric furnace, it is recommended to produce it using hot charging method. The electricity consumption for smelting medium and low carbon manganese iron products is less than 580kWh/t; If there is no manganese silicon electric furnace, cold charging can only be used, and the power consumption of medium carbon manganese iron products is about 1800kWh/t.

Both production methods use electric silicon thermal refining electric furnaces. Refining electric furnaces are intermittent production, and the smelting process is divided into several stages: remelting, arc ignition, feeding, melting, refining, and tapping. Based on the advanced experience in domestic smelting of medium and low carbon ferromanganese, this project adopts two 6300KVA refining furnaces, with a daily output of 55-60 tons for a single electric furnace and 110-120 tons for two electric furnaces; The annual production of two electric furnaces exceeds 36000 tons, which matches the annual production of 36000 tons of manganese silicon project.

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