| 摘要 |
Phosphate rock is heat treated at 380-600 DEG C to convert the organics to filterable carbon and the rock converted to wet process phosphoric acid of reduced colour and with reduced foaming. The acid may be converted into fertilizers, calcium or alkali metal salts or may be purified to recover its acid or uranium contents. Super phosphates or triple superphosphates may also be made. Rocks having high acid soluble organics but low total organics, and rocks containing a high content of acid insoluble heat labile iron sulphide are especially suitable. |
