Understanding High Purity Ferro Silicon: Composition, Production, and Uses

High Purity Ferro Silicon (FeSi) is a specially refined ferroalloy composed mainly of silicon (Si) and iron (Fe), with silicon content typically above 99% and extremely low impurities such as aluminum, calcium, carbon, and phosphorus.

It plays a critical role in industries that demand high cleanliness, high performance, and chemical stability — including semiconductors, precision alloys, and high-grade steels.

Chemical Composition and Properties

High Purity Ferro Silicon differs from standard grades of ferrosilicon in its purity and microstructure.

Typical specifications include:

Key Characteristics：

High Silicon Purity: Ensures strong reducing power and consistent metallurgical reactions.

Low Impurity Levels: Reduces contamination during alloying or semiconductor production.

Stable Phase Structure: Guarantees excellent performance during smelting and casting.

Production Process of High Purity Ferro Silicon

1. Raw Material Selection

Only high-purity quartz, low-ash carbon materials, and refined iron sources are used.

Strict control of raw material quality ensures minimal impurity introduction.

2. Smelting and Refining

The materials are melted in a high-temperature electric furnace.

Advanced refining technologies such as slag removal, gas purification, and controlled cooling are applied to ensure a uniform composition and dense structure.

3. Crushing and Sieving

After cooling, the high purity ferro silicon is crushed and screened into different sizes:

Lumps: 10–100mm

Granules: 1–10mm

Powders: 100–325 mesh

Hongshun offers customized sizes according to client requirements.

Applications of High Purity Ferro Silicon

1. Semiconductor and Electronic Industry

High Purity Ferro Silicon serves as a key raw material for producing electronic-grade silicon and polycrystalline silicon.

Its low impurity levels are essential for maintaining high electrical conductivity and structural integrity in semiconductor components.

2. Special and Stainless Steel Production

As an efficient deoxidizer and alloy additive, High Purity FeSi helps eliminate oxygen and improve:

Strength and hardness

Corrosion and oxidation resistance

Surface quality and uniformity

3. Aerospace and Precision Casting

High purity ensures minimal inclusions and stable performance in aerospace-grade superalloys and high-precision castings.

This makes it indispensable for parts requiring dimensional accuracy and purity.

4. Chemical and Solar Industries

Used as a source of high-purity silicon, it supports the manufacturing of solar cells, silicones, and silicon-based compounds.

Advantages of Choosing Hongshun High Purity Ferro Silicon

1. Consistent Quality Control

Anyang Hongshun adopts advanced smelting equipment and laboratory-level testing to ensure every batch meets international standards.

2. Flexible Customization

Products are available in block, granule, and powder forms, suitable for different metallurgical and industrial processes.

3. Reliable Supply and Export Service

With years of export experience, Hongshun guarantees on-time delivery, safe packaging, and technical support for global customers.

High Purity Ferro Silicon is more than just a ferroalloy — it’ s a foundation material for modern metallurgy, electronics, and advanced manufacturing.

By providing stable quality and high purity, Anyang Hongshun Industrial Co., Ltd. continues to serve customers worldwide with reliable, high-performance ferroalloy solutions.