Generally speaking, 75# and 72# ferro silicon are only 75% and 72% silicon content in ferro silicon. 75 ferrosilicon is the so-called hard 75 with a silicon content of 74-80%, and 72 ferrosilicon is a soft 75 with a silicon content of 72-80%. At present, 72 ferrosilicon is commonly used in aluminum plants.
| Model | Chemical component | |||||||
| Si | Al | Ca | Mn | Cr | P | S | C | |
| Range | ≤ | |||||||
| FeSi75-A | 74.0-80.0 | - | - | 0.40 | 0.30 | 0.04 | 0.02 | 0.10 |
| FeSi75-B | 74.0-80.0 | - | - | 0.40 | 0.30 | 0.04 | 0.02 | 0.10 |
| FeSi75-C | 72.0-80.0 | - | - | 0.50 | 0.50 | 0.04 | 0.02 | 0.20 |
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