Silicomanganese Production

Silicomanganese alloy is produced in an electric furnace. First, raw materials such as pig iron, manganese ore, limestone, and quartz sand are charged into the furnace in a specified proportion for smelting. The electric furnace used is typically a DC arc furnace or a short-arc electric furnace.

Inside the furnace, high temperatures are generated through electrode discharge, causing the raw materials to melt rapidly. A reducing agent-usually steelmaking slag and iron scrap-is then added to the molten mixture. The reducing agent reduces manganese oxides and silicon oxides in the melt, forming the silicomanganese alloy.

During the smelting process, temperature control is critical. The smelting time and the amount of reducing agent can be adjusted as needed to achieve the desired alloy composition and quality.

The silicomanganese alloy produced in the electric furnace is transferred to an external refining unit for further processing. The purpose of refining is to remove impurities and oxides generated during the furnace smelting process.

Refining is typically carried out using converters, tilting furnaces, oxygen blowing, or vacuum refining methods. Converters and tilting furnaces are common refining equipment, where oxygen is blown from the bottom to heat the molten metal and remove impurities.

In oxygen-blowing refining, high-pressure oxygen is injected into the molten pool, where it reacts with carbon in the metal to produce CO and CO₂ gases, thereby achieving decarburization.

Vacuum refining involves transferring the molten alloy into a vacuum chamber, where heating and stirring under low pressure help remove dissolved gases and impurities from the melt.