| 摘要 |
<p>The present invention relates to a cyclic process for continuous production of dicalcium phosphate from rock phosphate. Rock phosphate is treated with excess of spent acid or weak sulphuric acid under agitation. The slurry obtained is filtered and the filter cake is recycled for further leaching. Fresh rock phosphate is added to the filtrate under stirring followed by hydrated lime to increase the pH. This slurry is filtered and the filter cake is recycled to the first step. Hydrated lime is added to the filtrate which contains substantially pure mono calcium phosphate to convert the same to dicalcium phosphate. The filtrate obtained is recycled.</p> |
