Calcium Silicon Alloy

Calcium Silicon Alloy is an alloy composed of silicon, calcium, and small amounts of iron, aluminum, and carbon. It is an important metallurgical additive, appearing as silvery-gray lumps with a hard texture. It possesses excellent deoxidizing, desulfurizing, inoculating, and modifying properties, and is widely used in industries such as steel smelting, casting, and non-ferrous metal processing. It is a core auxiliary material for improving product quality and reducing production costs. Our calcium silicon alloy is produced using high-quality silica, quicklime, and coke as raw materials, smelted at high temperatures in an electric arc furnace. We strictly control every step of the production process to ensure uniform composition, low impurity content, and that all indicators meet domestic and international industry standards, satisfying the personalized needs of different customers.

 Steel Smelting Industry: As a highly efficient composite deoxidizer, it is used in converter and electric arc furnace steelmaking processes to quickly remove harmful impurities such as oxygen and sulfur from molten steel, reduce oxide inclusions, and improve the toughness, strength, and corrosion resistance of the steel. Simultaneously, the calcium silicon alloy also acts as an inoculator, improving the microstructure of the steel and enhancing its quality. It is suitable for producing high-quality carbon steel, alloy steel, and stainless steel.
 In the casting industry: As an inoculant and modifier, it is used in the production of cast iron and cast steel. It effectively refines grains, improves the microstructure of castings, reduces defects such as shrinkage cavities, porosity, and gas pores, and enhances the mechanical and machinability of castings. It is suitable for producing high-precision castings such as automotive parts, machine tool castings, and engineering machinery castings.

 In the non-ferrous metal processing industry: In the smelting process of non-ferrous metals such as aluminum alloys and magnesium alloys, it plays a role in deoxidation and impurity removal, improving the purity and mechanical properties of non-ferrous metal materials. It is suitable for producing non-ferrous metal parts in aerospace, electronics, and automotive fields.

The main raw materials for silicon calcium alloy production include:

Silica (SiO₂)
Lime (CaO)
Coke (C)
The smelting process occurs at 1500-1800°C in a strongly reducing atmosphere, using methods such as:
✔ Mixed Feeding Method
✔ Layered Feeding Method
✔ Calcium Carbide Method

The primary chemical reaction is:
CaO + SiO₂ + 3C → CaSi + 3CO↑

However, in real industrial production, calcium silicate slag is formed, and carbon reduction occurs at high temperatures.

1. Steel Smelting: Deoxidizer & Desulfurizer

• Deoxidation: Efficiently removes oxygen from molten steel, improving its purity and quality.
• Desulfurization: Reduces sulfur content, further enhancing mechanical properties of steel.

2. Cast Iron Production: Inoculant & Modifier

• Inoculant: Refines graphite structure in cast iron, increasing strength and hardness.
• Modifier: Improves microstructure, enhancing the mechanical properties of cast iron.

3. Non-Ferrous Metal Alloys: Strength & Durability Enhancement

Used in aluminum, magnesium, and copper alloys to improve:

Mechanical strength
Corrosion resistance
Heat resistance
Weldability
4. Chemical Industry: Reducing Agent

• Functions as a reducing agent in redox reactions, aiding in compound synthesis.

5. Special Applications

• Used in refractory materials, such as silicon-calcium bricks.
• Helps in producing special alloys and industrial compounds.

6. Environmental Protection: Wastewater Treatment

• Reacts with heavy metal ions in industrial wastewater, precipitating them for water purification.

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