The quality indicators of ferrosulfur mainly include the following:
1. Iron Content: Generally, the iron content is required to be no less than 60%.
2. Sulfur Content: Low-sulfur ferrosulfur has a sulfur content of less than 0.05%, medium-sulfur ferrosulfur has a sulfur content between 0.05% and 0.10%, and high-sulfur ferrosulfur has a sulfur content greater than 0.10%.
3. Wet Oxidation Index: For low-sulfur and medium-sulfur ferrosulfur, the wet oxidation loss should not exceed 15%.
4. Particle Size: The particle size of ferrosulfur should meet the requirements for use, typically between 40 and 300 mesh.