| 摘要 |
Phosphoric acid is produced by a wet process in a homogeneous medium from calcium phosphate ore, sulphuric acid and a continuously added aqueous solution of recycled acid. Part of the phosphate is treated in a primary reaction medium, prepared separately and differing in composition from the final medium sought. By regulating the compositions of the various reaction media, the present process advantageously increases the concentration of the phosphoric acid produced and/or enhances the quality of filtration, along with other advantages. The process can advantageously be applied for the economic treatment of low-grade, poorly reactive or unground phosphates. |
