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How to adjust the silicon content in ferrosilicon in smelting?

Date: 06-06-2019
How to adjust the silicon content in ferrosilicon in smelting?
 In smelting, we should always pay attention to and master the change of silicon content of ferrosilicon in order to prevent waste products. Therefore, it is one of the only tasks for smelters to correctly grasp the changing trend of silicon content and adjust the silicon content appropriately.
The low silicon content of ferrosilicon is related to the following factors:
1. Oven condition is too sticky or electrode insertion depth is shallow, ignition is serious, heat loss is large, furnace temperature is low, and silicon dioxide can not be fully reduced.
2. It is easy to reduce the silicon content in ferrosilicon by adding rusty and powdered steel chips suddenly or too short steel chips.
3. Too much iron or steel scraps are added to the furnace.
4. The smelting time is not enough to produce iron or "run eyes".
5. Burning out the taphole consumes too much round steel.
6. After hot shutdown, the temperature of the first furnace is lower.
Whenever the silicon content of ferrosilicon is less than 74%, it should be adjusted. Several batches of burden without steel chips can be added as appropriate to increase the silicon content of ferrosilicon.
When the furnace is in normal condition and the silicon content of ferrosilicon is more than 76%, and there is an upward trend, steel chips should be added to reduce the silicon content of ferrosilicon.  Practical experience has proved that 75 ferrosilicon can be smelted in a large capacity submerged arc furnace with additional steel chips of 50-60 kg for each reduction of 1% silicon. Additional steel scraps should be added to the material surface of the furnace core or surface, but not to the material surface of the tapping phase electrode.

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