A defect of caking entangles the powdered MAP made by the phosphoric acidconcentrating process in China, and the company has solved this problem by research and development.

• 国内采用浓缩磷酸法生产的粉状磷酸一铵普遍存在结块缺陷,云南三环化工有限公司通过技术攻关解决了此问题。