How to adjust the silicon content of ferrosilicon in smelting?

In smelting, it is necessary to pay attention to and master the change of silicon content of ferrosilicon in order to prevent waste products. Therefore, it is one of the tasks for smelters to master the trend of silicon content and adjust it properly.

The low silicon content of ferrosilicon is related to the following factors:

1. The furnace condition is too sticky or the electrode insertion depth is shallow, the puncture fire is serious, the heat loss is large, the furnace temperature is low, and the silica can not be fully reduced.

2. Suddenly add a lot of rusty and powder steel chips, or add too short steel chips, easy to reduce the silicon content of ferrosilicon.

3. Excessive amount of recycled iron or steel chips is added.

4. Smelting time is not enough.

5. Burn out the iron opening and consume too much round steel.

6. After hot shutdown, the furnace temperature is low.

Whenever the silicon content of ferrosilicon is less than 74%, it should be adjusted. Several batches of charge without steel chips can be added as appropriate to improve the silicon content of ferrosilicon.

When the furnace condition is normal and the silicon content of ferrosilicon is greater than 76%, and there is a rising trend, steel chips should be added to reduce the silicon content of ferrosilicon. Practical experience has proved that the large capacity ore furnace, smelting 75 ferrosilicon, every 1% silicon reduction, can add 50~60 kilograms of steel chips. Additional steel chips should be added to the core or large surface of the feed surface, not to the feed surface of the outlet phase electrode.