| 摘要 |
<p>Phosphoric acid is manufacured by the use of fluosilicic acid with or without phosphoric acid, at a temperature between ambient and 100 DEG C until the phosphate and fluorine content of the rock phosphate is solubilised, the slurry being filtered and the whole or a part of this filtrate of the slurry being concentrated until calcium silicofluoride is precipitated, the slurry being cooled and filtered to give product phosphoric acid and calcium siliofluoride as a residue.</p> |
