When the particle size is too large, the resistance of the furnace material decreases, making it difficult for the electrodes to deeply insert into the furnace material, resulting in low furnace temperature and small crucible, and abnormal smelting. If the particle size is too small or there is too much powder, the burning loss will be greater, which can easily make the furnace condition sticky and affect the permeability of the material surface. Therefore, coke must have a certain particle size for use. It is not allowed to place the pouring at a fixed position, and the pouring should be moved repeatedly to prevent mold sticking and reduce segregation. It is advisable to use coke with a particle size of less than 8 millimeters for large ferrosilicon electric furnaces. The temperature of the small ferrosilicon electric furnace is low, and in order to increase the temperature, a "smoldering" process is adopted in operation. Adding some coke powder can help to sinter the material surface, so that the electrode can be deeply inserted into the furnace material. So, when smelting small capacity ferrosilicon electric furnaces, a small amount of coke powder can be used.
There are no specific requirements for the physical properties of coke. You can choose a more suitable coke based on production practice.