Ferro Silicon Powder

Make: In the standard process liquid ferrosilicon is removed from the furnace, cooled, crushed, and ground to the desired fineness. Fine and coarse powders are available. The finer one is preferred in the first stages of a sink and float plant. After some running time the coarser quality is added to make up the loss and to correct wear. The actual separating vessel is of great importance; it should be so formed that the heavy sink product at its bottom cannot grind the ferrosilicon as in a ball mill.

In many cases wet grinding is preferred as the less expensive process. This, however, is done locally because the ground sludges cannot be transported easily. Any drying must be carried out with extreme care because at higher temperatures decomposition occurs in consequence of increased corrosion. These grinding plants are rather expensive, and are often not running to their full capacity; yet it is useless to build a smaller plant for the mills must have a certain size for an economical treatment of this material. Ferrosilicon with a higher Si-content (for example, 45 or 75% Si) can be ground more easily because it is more brittle than the 15% which, as has been shown in tests, possesses a certain toughness making comminution difficult. Tests have shown that the grinding operation causes great wear of the mills and is costly.

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