High carbon silicon slag is a type of silicon slag. Just like other silicon slag models, it is the dross of silicon metal. During silicon metal production, there will be unqualified metallic silicon came out along with silicon metal. It is a by-product . Sometimes in ferrosilicon furnaces also produce it accidentally, but ferrosilicon slag usually contains of higher grade of iron.
In the production of silicon metal, main raw materials includes silica (SiO2) and charcoal(Carbon). On the other hand, the raw materials of ferrosilicon are Silica, Coke and iron scraps. The key difference is FeSi contains of Iron while silicon metal dose not. So, the iron in high carbon silicon slag is very low. So it is not a kind of FeSi or other ferroalloys.In the high-temperature furnace, silica and carbon undergo a reduction reaction. At this time, the oxygen atoms in the furnace gradually combine with carbon atoms to form carbon dioxide and will be discharge out of the furnace. The metal silicon inside the furnace gets higher and higher, and the carbon content gets lower and lower.
High Carbon Silicon Slag Types
However, if the heating suddenly stops at this time and the temperature of the furnace drops rapidly, the mixture of silicon and carbon will cool and solidify, forming high carbon silicon. Its another name is silicon carbon alloy. This is the most common high carbon Si slag. Generally speaking, its carbon content is more than 65%. Si68C18 Si65C15 are two typical models.
Another type of high carbon silicon slag is actually silicon dross from the production of Si metals. For example, in the manufacturing process of silicon metal 553, dross is continuously produced. These dross contain silicon and carbon. After screening, we can get a silicon slag with a Si content of 15-55% and a carbon content of 2%-10%. Compared with products such as Si 553, Si 441, and Si 3303, the C in this High C Si Slag is It is already very high, so we call it high carbon silicon. This product also contains a large amount of SiO2, as well as other impurity elements, such as aluminum.
There is also a kind of HC Silicon Slag, which is the residue for normal production of industrial silicon. It exists at the bottom of the electric arc furnace or submersible furnace. When the discharged out of the furnace with the silicon metal liquid. After years of accumulation, it will form a certain thickness. Workers remove this silicon slag when the clieanning and servicing the furnace. These removed silicon residues contain more than 60% silicon. Likewise, they also need to be screened and classified.
High Carbon Silicon Slag Sizes & Usage
The raw material of High carbon silicon slag is irregular natural blocks. Silicon slag manufacturer processes it into standard lumps with particle size of 10-100mm, 10-50mm. We process it into particles of 1-10mm, or 1-5mm, 0-10mm powders. Sometime we press it into Silicon Carbon Briquette. H-C silicon slag can be used as a deoxidizer for steelmaking. Because it is cheap, it is very cost-effective. At the same time, the carbon element it contains can play the role of carbonization.