Silicon Metal

China Silicon Metal Manufacturer&Supplier

ZHEN AN INTERNATIONAL CO., LIMITED

Complete Production Facilities

We Have 4 sets of production lines for ferroalloy of 20,000 TPY; 4 sets of production lines for Alloy cored wire of 30,000 TPY; 6 sets of vacuum furnaces; and 10+ sets of furnaces for other purposes.

Customized

Our personalized services allow us to find the solution most suitable for you. Specific parameters, Dimensions, and Packaging of Products can be customized.

Quality Test

We have our own laboratory. After the goods are produced, random samples are taken and tested for element content to ensure there are no quality problems. We follow strict testing & quality check parameters, ensuring 100% customer satisfaction.

Export Business Veteran

We have 30+ years of supply experience in the Chinese domestic market and international markets. We have rich experience in exporting to foreign countries.

What is Silicon Metal?

Silicon metal is a versatile element that finds its applications in various industries such as electro, metallurgy, and chemical industry. It has a silver-gray or dark-gray appearance with a metallic luster. Silicon metal has a high melting point, good heat resistance, high resistivity, and superior oxidation resistance.

The different grades of metal silicon are divided based on the content of iron, aluminum, and calcium present in them. These grades include 553, 441, 3303, 2202, 1101, etc. The source of the silicon metal number is based on four digits, where each digit indicates the maximum content requirements of iron, aluminum, and calcium, which are the main impurity elements in the product. The iron and aluminum content takes one digit after the decimal point, while the calcium content takes two digits after the decimal point. For instance, 441 represents the content of iron, aluminum, and calcium in silicon metal as 0.4%, 0.4%, and 0.1%, respectively.

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How is silicon metal made?

Preparation of raw materials

The main raw materials used in the production of silicon metal are silicon dioxide (SiO2) and smelted silicon (Si). Silicon dioxide is usually extracted or processed from ores like quartz ore and quartz sand, while smelted silicon is obtained through high-temperature reduction smelting using a smelting furnace.

Smelting

First of all, the raw material of silicon dioxide and smelting silicon is mixed according to a certain ratio, and then sent to the electric furnace or high-temperature smelting furnace for heating, to achieve high-temperature conditions. At high temperatures, smelting silicon will undergo a reduction reaction to reduce silicon dioxide to silicon metal. At the same time, according to the process requirements, certain fluxes, deoxidizers, and alloying elements can be added to adjust the composition and properties of silicon metal.

Refining and purification

After melting silicon metal still contains certain impurities and non-metallic components, which need to be refined and purified. Commonly used refining methods include vacuum furnace refining silicon and atmosphere furnace refining silicon. Vacuum furnace refining of silicon is the use of high-temperature melting under vacuum conditions, impurities and non-metallic oxides, and other volatilization, to achieve high purity of silicon metal. Atmosphere furnace silicon refining is carried out under specific atmosphere conditions, through the gas reaction in the atmosphere to improve the purity of silicon metal.

Casting and processing

After refining and purification, silicon metal can be cast. Generally, continuous casting or crystal growth methods are used, whereby molten silicon metal is injected into a specific mold or crystal growth equipment and cooled and solidified to form silicon metal lumps or crystals. Then, after adjustment and processing, silicon metal products meeting the requirements can be obtained.

Quality Inspection and Packaging

Finally, the produced silicon metal is subjected to quality testing. Common testing methods include chemical analysis, physical property testing and impurity content testing. After passing the test, the silicon metal is packed and stored for subsequent transport and use.

What Is Silicon Used For?

1. Silicon has a wide range of applications in smelting alloying elements as a reducing agent in the melting of many metals.
2. Silicon metal is widely used in refractory materials and power metallurgy industry to improve the heat resistance, wear resistance and oxidation resistance of materials.
3. Industrial silicon powder is used as an alloy additive to improve the hardenability of steel in the metallurgy and foundry industry.
4. Mainly used in the production of alloys, polysilicon, organosilicon materials, and high-grade refractory materials.
5. It is suitable for the production of high-temperature materials, used in the manufacture of enamel and pottery; it can also meet the demand for the semiconductor industry, used to produce ultra-pure silicon wafers (silicon wafers).
6. Silicon lumps are mainly used in silicon products, aluminum alloy ingots, silicon steel sheets, aluminum alloy materials, and special steel smelting.

Classification Of Silicon Metal

Classification of silicon metal is usually classified according to the content of the three main impurities, iron, aluminum and calcium, contained in the composition of silicon metal. According to the content of iron, aluminum, and calcium in silicon metal, it can be classified into different grades such as Si Metal 553, Si Metal 441, Si Metal 3303, Si Metal 2202, and Si Metal 1101.

Metal Silicon 441

The silicon content of Silicon Metal 441 is 99.1%, the iron content is 0.4%, the aluminum content is 0.4%, and the calcium content is 0.1%.
Specification and particle size: natural blocks, 10-100mm, 10-60mm, 3-10mm, 1-3mm, 0-1mm, or customized according to customer requirements.