Products Parameters
| Type | Chemical Composition (%) | ||||
| Si | Al | S | P | C | |
| ≤ | |||||
| Silicon Slag 35-38 | 35-38 | 5 | 0.1 | 0.05 |
5 |
| Silicon Slag 38-42 | 38-42 | 5 | 0.1 | 0.05 | 5 |
| Silicon Slag 42-47 | 42-47 | 5 | 0.1 | 0.05 | 5 |
| Silicon Slag 50-55 | 50-55 | 5 | 0.1 | 0.05 | 5 |
| Silicon Slag 55-60 | 55-60 | 5 | 0.1 | 0.05 | 5 |
| Silicon Slag 60-65 | 60-65 | 5 | 0.1 | 0.05 | 5 |
| Size | 10-50mm 90% min/10-70mm 90% min /10-100mm 90% min | ||||
Products Description
Silicon slag is a by-product in the metallurgical industry, mainly derived from the production process of ferrosilicon alloy or metallic silicon. It usually contains a certain proportion of silicon, as well as other impurities such as aluminum, calcium, iron, etc. Although silicon slag is not the main product, its application value in metallurgy and other industrial fields has gradually been valued and has become one of the important links in resource recycling.
Silicon slag is mainly produced during the smelting process of ferrosilicon alloy or metallic silicon. In a blast furnace or electric furnace, silica reacts with a carbonaceous reducing agent at high temperature to produce silicon, and a certain amount of slag is also produced. These slags usually contain incompletely reduced silicon elements, as well as other metal oxides and non-metallic impurities. The specific composition of silicon slag varies depending on the raw materials and production process, but it usually contains 30%-70% silicon, and the rest is aluminum oxide, calcium oxide, iron oxide and other compounds.
Silicon slag can be used as a deoxidizer in steel smelting. During the steelmaking process, the presence of oxygen will reduce the quality of steel, so deoxidizers need to be added to remove excess oxygen. The silicon element in silicon slag can combine with oxygen in molten steel to form silicon dioxide and float to the slag layer, thereby purifying the molten steel. Compared with pure silicon, silicon slag has a lower cost, so it has an economic advantage in some steel grades that do not have strict requirements on silicon content. In the foundry industry, silicon slag can be used to improve the properties of cast iron. By adding silicon slag, the silicon content in molten iron can be adjusted, thereby affecting the strength, hardness and fluidity of cast iron.
In addition, other elements in silicon slag such as calcium and aluminum may also have a positive effect on the microstructure of castings. Part of the silicon slag can be further processed to recover the silicon element. Through crushing, sorting and chemical treatment, the silicon in silicon slag can be extracted and reused in the production of ferrosilicon alloy or metallic silicon. This recycling not only reduces resource waste, but also reduces environmental pollution. Silicon slag can also be used to produce refractory materials, cement additives, etc. For example, alumina and calcium oxide in silica slag can be used as components of refractory materials, while fine powder of silica slag can be used to improve certain properties of cement.
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