Silicon metal is a type of monomeric silicon, so there is no metallic silicon in natural ores. Silicon in nature is usually found in the form of oxides, such as silicon dioxide. Silicon metal is not a metal, it is mainly smelted from quartz stone containing silicon dioxide at high temperatures into different grades of silicon metal, and silicon metal with high silicon content is smelted by reducing silicon from silicon dioxide using carbides such as petroleum coke or semi-coke as a reducing agent. At present, China is the country that produces silicon in abundance, due to the natural advantages of raw materials, making China the main producer of silicon metal. According to the global silicon metal export share analysis survey in 2021, China's annual silicon metal export volume accounts for 83% of the total global silicon metal export volume, which is about 777,800 tons.
silicon metal for aluminum for aluminum is a very important furnace additive in the production of aluminum products, which can effectively enhance the plasticity and wear resistance of aluminum products. Silicon metal 441 is used in the production of silicon aluminum alloys and casting aluminum alloys to effectively enhance the flow properties and thermal properties of aluminum, thus making aluminum products have better casting properties and weldability.
Silicon metal is processed and purified as a raw material for the production of silicone rubber, silicone resin and silicone oil. Silicone rubber purified from Silicon metal 2202 has good elasticity and high-temperature resistance, and is used to manufacture medical supplies and high-temperature-resistant gasket products. Silicone resins purified from silicon metal are mainly used in the production of insulating and high-temperature resistant paints. Silicone oil is used as a raw material for the production of lubricants, polishers and fluid springs.
High-purity silicon metal is an important semiconductor material. High-purity silicon elements are added to monocrystalline silicon, resulting in silicon semiconductors, which are important raw materials for the production of solar cells and electronic components.
The use of silicon metal allows the production of highly transparent glass fibers, and lasers are transmitted numerous times in glass fiber tubes, replacing bulky cables. And the glass fiber made with metallic silicon, as the raw material of optical fiber, has better communication ability and can transmit 256 phone calls at the same time without electromagnetic interference, and has high confidentiality.
The raw materials for the production of silicon metal includes silica, wood chips (charcoal), petroleum coke, etc. Silica is used as the main raw material in the production of silicon metal, and wood chips and petroleum coke are added as reducing agents in the smelting process of mineral furnace to reduce silicon dioxide in silica to silicon, forming silicon metal solution. After cooling, the resulting product is silicon metal.
| Grades | Specifications | |||
| Chemical composition(%) | ||||
| Si | Fe | Al | Ca | |
| Min | Max | |||
| Silicon Metal 553 | 98.5 | 0.5 | 0.5 | 0.3 |
| Silicon Metal 441 | 99.0 | 0.4 | 0.4 | 0.1 |
| Silicon Metal 421 | 99.0 | 0.4 | 0.2 | 0.1 |
| Silicon Metal 3303 | 99.0 | 0.3 | 0.3 | 0.03 |
| Silicon Metal 2202 | 99.0 | 0.2 | 0.2 | 0.02 |
| Silicon Metal 1101 | 99.0 | 0.1 | 0.1 | 0.01 |
| Off grade silicon | 97.0 | 1.5 | - | 0.3 |
| Size:1-10mm, 3-8mm, 10-50mm, 10-100mm, 200 mesh, 325 mesh, | ||||
