Ferro Silicon Alloy Production Process

Raw Material Preparation

Select high - quality quartz, coke, and iron ore as raw materials. Quartz should have a high silicon dioxide content, while coke needs to possess appropriate fixed carbon content and low ash content. Iron ore is chosen based on its iron grade and impurity content. These raw materials are accurately proportioned according to the required alloy composition and then crushed and screened to ensure proper particle size for smelting.

Smelting Process

The prepared raw materials are fed into a submerged - arc furnace. In the furnace, under high - temperature conditions (usually around 1800 - 2200°C), a series of chemical reactions occur. The carbon in coke reduces the silicon dioxide in quartz to produce silicon, which then combines with iron in the iron ore to form silicon - iron alloy. The smelting process requires strict control of electrical power input, furnace temperature, and reaction time to ensure the quality and yield of the alloy.

Refining Process

After smelting, the molten silicon - iron alloy is refined to remove impurities. This may involve processes such as slag - metal separation to remove unwanted slag components, and sometimes additional additives are used to further adjust the chemical composition and improve the purity of the alloy.

Casting and Cooling

The refined molten alloy is cast into molds of appropriate shapes, such as ingots. Then, the castings are cooled slowly to avoid internal stress and ensure the structural integrity of the alloy. After cooling, the silicon - iron alloy ingots are ready for further processing or packaging.

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Specification

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Technical Parameters

Chemical Composition

Silicon (Si): Usually within the range of 45% - 75% depending on different grades (e.g., FeSi45 contains about 45% silicon, and FeSi75 contains about 75% silicon).

Iron (Fe): The balance part, along with trace amounts of other elements.

Impurities:

Aluminum (Al): Generally ≤ 2.0% for common grades, but can be lower in special low - aluminum grades.

Calcium (Ca): ≤ 1.0%.

Phosphorus (P): ≤ 0.05%.

Sulfur (S): ≤ 0.02%.

Physical Properties

Density: Approximately 6.5 - 7.0 g/cm³.

Melting Point: Around 1260 - 1400°C, varying with different silicon contents.

Hardness: Mohs hardness is about 5 - 6.

Granularity

Ingot form: Standard ingot size is usually (length × width × thickness) 600mm × 120mm × 60mm, but can be customized according to customer requirements.

Granular form: Commonly available in particle sizes such as 10 - 50mm, 20 - 80mm, etc., with particle size distribution meeting relevant industry standards.

Application

🏭 Steelmaking

Ferro Silicon is primarily used as a deoxidizer and alloying agent in the production of various steel grades:

Carbon steel

Stainless steel

Electrical steel

High-strength low-alloy (HSLA) steel

⚒️ Foundry Industry

Used as an inoculant to promote graphite formation and improve the microstructure in grey and ductile cast iron. It also reduces shrinkage defects during solidification.

🔥 Ferroalloy Production

Acts as a reducing agent in the manufacture of other ferroalloys, such as:

Ferro Manganese

Ferro Chromium

Ferro Tungsten

🧪 Magnesium Production

In the Pidgeon process, silicon from FeSi serves as a critical reducing agent for producing magnesium metal.

Why Choose Our Ferro Silicon

🏭 Advanced Production Facilities

We use state-of-the-art electric arc furnaces and precision metallurgy processes to produce high-quality FeSi with low impurities and excellent consistency.