| 摘要 |
Wet process phosphoric acid containing iron, aluminum or magnesium compounds as impurities is ammoniated to produce an ammonium phosphate having a gelatinous, colloidal component of iron, aluminum or magnesium ammonium phosphate, the ammonium phosphate is heated to dehydrate the gel structure under conditions to prevent the formation of polyphosphates, and the dried material is comminuted to finely divided particles that produce a stable aqueous suspension when dispersed in water. A water soluble magnesium compound may be added to the phosphoric acid, thereby providing magnesium ammonium phosphate in the product.
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