Metallic silicon is hard and brittle, insoluble in acid at room temperature, but easily soluble in alkali. The properties of metal silicon are similar to those of germanium, lead, and tin, and have semiconductor properties. Silicon is extremely rich in resources in the earth’s crust, second only to oxygen, accounting for more than a quarter of the total weight of the earth’s crust, and exists in the form of silica or silicate.
Silicon is used in large quantities to be smelted into ferrosilicon alloy as an alloying element in the iron and steel industry, and as a reducing agent in the smelting of many metals. Silicon is also a good component in aluminum alloys, and most cast aluminum alloys contain silicon.
Silicon is the raw material of ultra-pure silicon in the electronics industry. Electronic devices made of ultra-pure semiconductor monocrystalline silicon have the advantages of small size, light weight, good reliability and long life.
| Type | Content of Elements | ||||
| % Si | % Fe | % Al | % Ca | % P | |
| 1501 | 99.69 | 0.15 | 0.15 | 0.01 | ≤0.004% |
| 1502 | 99.68 | 0.15 | 0.15 | 0.02 | ≤0.004% |
| 1101 | 99.79 | 0.1 | 0.1 | 0.01 | ≤0.004% |
| 2202 | 99.58 | 0.2 | 0.2 | 0.02 | ≤0.004% |
| 2502 | 99.48 | 0.25 | 0.25 | 0.02 | ≤0.004% |
| 3303 | 99.37 | 0.3 | 0.3 | 0.03 | ≤0.005% |
| 411 | 99.4 | 0.4 | 0.1 | 0.1 | ≤0.005% |
| 421 | 99.3 | 0.4 | 0.2 | 0.1 | – |
| 441 | 99.1 | 0.4 | 0.4 | 0.1 | – |
| 551 | 98.9 | 0.5 | 0.5 | 0.1 | – |
| 553 | 98.7 | 0.5 | 0.5 | 0.3 | – |
1.The main use of silicon metal is as an additive for non-ferrous alloys.
2.Alloying agent for demanding silicon steel.
3.Deoxidizer for smelting special steel grades and non-ferrous alloys
4.Silicon metal is a good component in aluminum alloys, and most cast aluminum alloys contain silicon.
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