The preferred fertilizers are high-analysis types such as monoammonium phosphate and diammonium phosphate. 优质肥料是属于高浓度类型，例如磷酸一铵和磷酸二铵。
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。
