The difference between 441 and 553 is the difference in purity, the silicon content of 553 is ≥98.7%, while the silicon content of 441 is ≥99.1%, specifically, industrial silicon is quartz and carbon in the high-temperature reaction in the ore furnace: SIO2+C=SI+CO2. Quartz has poor quality and good quality points, carbon as a reducing agent also has poor quality and good quality, the difference between these raw materials determines the purity of industrial silicon. From a cost point of view, it is obvious that the higher the quality of raw materials, the more expensive.
1, Metal silicon abrasives because of its high hardness, good chemical stability, with a certain toughness, is widely used in the manufacture of grinding wheels, whetstones, coated abrasives or free grinding. Mainly used for glass, ceramics, stone and other non-metallic materials, cast iron and some non-ferrous metal grinding. It is very weakly reactive with these materials. The hardness of metallic silicon is second only to diamond and has strong wear resistance.
2, Due to the high melting point (decomposition temperature), chemical inertness and thermal shock resistance of metal silicon, it is a kind of high temperature and corrosion resistant material. The main methods of producing metal silicon refractories are pressing sintering, pressing recrystallization, casting recrystallization, vapor deposition on carbon materials, etc. Metal silicon is widely used in metallurgy because of its high temperature resistance, high strength, good thermal conductivity and impact resistance.
3, Metal silicon can be used as a purifying agent for iron and steel smelting, that is, steelmaking deoxidizer and cast iron structure improver. Silicon metal can decompose in molten steel and react with free oxygen and metal oxides in molten steel to form carbon monoxide and silicon-containing slag. In cast iron smelting, too much silicon is often added, allowing a small amount of silicon to enter the hot metal. This treatment purified the structure of cast iron and promoted the perfection of cast iron castings.
| Model | Chemical Component | |||
| Si | Impurity content less than | |||
| Fe | Al | Ca | ||
| Si-2102 | 99.68 | 0.2 | 0.1 | 0.02 |
| Si-2105 | 99.65 | 0.2 | 0.1 | 0.05 |
| Si-211 | 99.60 | 0.2 | 0.1 | 0.1 |
| Si-3105 | 99.55 | 0.3 | 0.1 | 0.05 |
| Si-311 | 99.50 | 0.3 | 0.1 | 0.1 |
| Si-411 | 99.40 | 0.4 | 0.1 | 0.1 |
| Si-421 | 99.30 | 0.4 | 0.2 | 0.1 |
| Si-441
|
98.50 | 0.4 | 0.4 | 0.1 |
| Si-553
|
98.50 | 0.5 | 0.5 | 0.1 |
Silicon metal is usually classified according to the content of the three main impurities it contains: iron, aluminum and calcium. According to the percentage content of iron, aluminum and calcium in metal silicon, metal silicon can be divided into 553, 441, 411, 421, 3303, 3305, 2202, 2502, 1501, 1101 and other different grades. (Source of numbering for silicon metal: the first and second codes are the percentage content of iron and aluminum, and the third and fourth two digits represent the content of calcium).
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