Siliceous phosphate rock (A-layer ore)
Main chemical components：
1. P ₂ O ₅: Content ≥ 28%.
2. MgO: content<2.0%.
3. R ₂ O ∝: Content<4%.
4. SiO ₂: Content of 10% -15%.
Product characteristics：
1. Silicate type.
2. High ferric oxide content.
3. High silicon content.
4. It mainly exists in the form of block minerals.
5. The arsenic content is below 30 ppm.
6. The content of heavy metals (lead, mercury, chromium) is less than 20 ppm.
Application：Suitable raw materials for yellow phosphorus production.
