Characteristics of Manganese Silicon Alloy Submerged Arc Furnace

The manganese silicon alloy submerged arc furnace is a submerged arc furnaces specially used for the production of manganese silicon alloy (an important ferroalloy, the main components of which are manganese, silicon and iron). Its characteristics are mainly reflected in the following aspects.

Characteristics of Manganese Silicon Alloy Submerged Arc Furnace

1. High temperature reduction smelting

The production of manganese silicon alloy requires high temperature (usually the temperature in the furnace can reach 14001600℃) and a strong reducing atmosphere to reduce the oxides of manganese and silicon (such as MnO₂, SiO₂) to metal.

The submerged arc furnaces provides a high temperature environment through arc and resistance heating, and relies on carbonaceous reducing agents (such as coke) to complete the reduction reaction.

2. Furnace structure

Closed or semi-closed SAF is usually used to reduce smoke emissions and heat energy loss, while recovering coal gas (such as CO) as energy.

The melting furnace furnace body is composed of refractory material (such as magnesia bricks, carbon bricks) lining and steel shell to withstand high temperature and chemical corrosion.

3. Electrode system

Self-baked electrodes or pre-baked electrodes are used to control the temperature and reduction conditions of the reaction zone in the furnace by adjusting the electrode insertion depth and current.

The electrode system needs to have good conductivity and high temperature resistance.

4. Raw material requirements

The main raw materials include manganese ore (such as manganese oxide ore, manganese carbonate ore), silica (SiO₂), coke (reducing agent) and iron additives (such as steel scraps).

The raw materials need to be crushed, screened and batched to ensure the appropriate particle size and chemical composition.

5. High energy consumption

The power consumption of producing manganese silicon alloy is high, usually 3500 - 5000 kWh/ton alloy, accounting for a large proportion of the production cost.

Optimizing the furnace conditions of the electric furnace (such as voltage, current, power factor) is crucial to reducing energy consumption.

6. Smelting process characteristics

The smelting process is divided into a melting period and a reduction period. The slag basicity (CaO/SiO₂ ratio) needs to be controlled to promote the reduction of manganese and silicon.

The fluidity of slag has a significant impact on the reaction efficiency, and lime (CaO) or fluorite (CaF₂) is usually added to adjust the slag properties.

7. Environmental protection & resource utilization

Closed industrial electric furnaces can recycle coal gas (rich in CO) for power generation or heating.

Slag can be used comprehensively (such as building materials or manganese ore recovery) to reduce waste emissions.

8. Product characteristics

Manganese silicon alloy is mainly used in the steel industry as a deoxidizer and alloy additive, and its composition must meet national standards (such as Mn ≥ 60%, Si ≥ 14%).

By adjusting the raw material ratio, different grades of manganese silicon alloy (such as Mn65Si17, Mn60Si14) can be produced.

9. Automatic control

Modern manganese silicon alloy submerged arc furnaces are usually equipped with computer control systems to monitor parameters such as electrode position, temperature, power, etc. in real time to optimize smelting efficiency.

The core features of manganese silicon alloy submerged arc furnace are high temperature reduction, high energy consumption, closed design and complex raw material ratio control. Its efficient operation depends on stable power supply, reasonable furnace design and sophisticated process management, while taking into account environmental protection and resource recycling.

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