Silicon metal is mainly used as an additive in non-ferrous metal alloys, also known as crystalline silicon or industrial silicon. Silicon metal is a product made by smelting quartz and coke in an electric furnace. The main component of silicon is about 98% (in recent years, the silicon content in silicon metal has also reached 99.99%). The remaining impurities are iron and aluminum, calcium, and so on.
| Grade | Composition | |||
| Impurities(%) | ||||
| Si | Fe | AI | Ca | |
| ≥ | ≤ | |||
| 1101 | 99.79 | 0.1 | 0.1 | 0.01 |
| 2202 | 99.58 | 0.2 | 0.2 | 0.02 |
| 3303 | 99.37 | 0.3 | 0.3 | 0.03 |
| 441 | 99.1 | 0.4 | 0.4 | 0.1 |
| 553 | 98.7 | 0.5 | 0.5 | 0.3 |
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