| 摘要 |
This invention provides a process for clarifying black wet process phosphoric acid that comprises admixing said black phosphoric acid with phosphoric acid rinse water in a weight ratio of rinse water to black acid between about 0.5 and about 5, letting the resultant mixture stand thereby obtaining settled material and supernatant clarified black phosphoric acid, and, when said weight ratio is below about 1 to 1.5, depending on the quality of the black acid being clarified, separating said clarified black phosphoric acid from said settled material.
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