In utilizing phosphogypsum as cement retarder, the traditional burnt phosphogypsum process for granulation is unsatisfied in large investment, high energy consumption and secondary pollution.

• 针对磷石膏改质煅烧成球工艺存在投资大、能耗高、二次污染的缺点，研究了磷石膏改质直接成球作水泥缓凝剂的新工艺。