The phosphate-contained residue in the purifying process may be fed back to the production of ammonium phosphate fertilizer.

• 净化液经浓缩到适当密度后再冷却结晶，即可获得所需纯度的磷酸一铵产品，净化过程所产含磷滤渣可返回磷铵肥料生产系统。