Description  

The silicon off-grade is a by-product from production of silicon metal  of ≥99% purity.   To ensure the quality of the silicon metal, top  portion of the melt is separated when draining from the electric-arc  furnace. The less pure portion of silicon metal typically contains  higher contents of iron, aluminum, calcium and other slag.  With the  employment of density separation machines, different grades of off-grade  silicon are segregated efficiently.

 

Applications  

Off-grade material is much cheaper than ≥99% purity silicon metal, and has many industrial applications. For example, It is
1. Used as de-oxidizing agent in steel production to reduce oxygen levels in the melt via reaction such as
               Si + 2 O (in liquid Fe) ––> SiO2
(SiO2 is formed as a solid dispersed in molten Fe, and subsequently floats to the surface of the melt. It is
removed by either skimming or by draining molten iron from the bottom);
2. Use as de-oxidizing agent in the production of magnesium, chromium and other metals via the same
mechanism;
3. Used in the production of lower grade of Si3N4 in a cost effective manner, the material is suitable for
refractory applications such as refractory bricks and other high-temperature applications;  
4. An economical feedstock in the manufacture of silica sol or colloidal silica;
5. A low cost feedstock in the manufacture of organosilyl derivatives and silicone products.

Specification   

Size: 10-60 mm, 1-3mm, 0-3mm or as requirements 
 
Packing:1 MT per big Bag 
 
Remark:Chemical composition and size can be optimized by the customers' requirements.