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| Impurities content (weight %) | |
|---|---|
| Insoluble in HCl substances + Silicates (SiO32-) | <0.2 |
| Calcination losses | <0.3 |
| Sulfates (SO42-) | <0.02 |
| Chlorides (Cl-) | <0.01 |
| Ammonium salts (NH4+) | <0.01 |
| Potassium + Sodium (K+ + Na+) | <0.1 |
| Vanadium(IV) oxide (V2O4) | <1.5 |



