磷石膏（ PG）是工业湿法生产磷酸排放出的固体废弃物，在水泥生产中的应用是其资源化利用的主要途径。本文分析了磷石膏用于硅酸盐水泥（ OPC）和硫铝酸盐水泥（ SAC）生产所面临的问题与挑战，重点分析了磷石膏在硫铝酸盐水泥生产中的应用前景。磷石膏作水泥原料时可为硅酸盐水泥和硫铝酸盐水泥提供钙质，高温煅烧可以降低杂质对水泥性能的不利影响，但提高磷石膏分解率是需要深入研究的问题。通过过量配入磷石膏可以生产高硫型硫铝酸盐水泥，磷石膏的分解率可以控制在较高水平。作后掺石膏时，磷石膏中杂质可以作为功能组分改善硫铝酸盐水泥凝结时间。因此磷石膏在硫铝酸盐水泥生产中的应用是值得关注的方向。
Phosphogypsum ( PG) is an industrial by-product generated from the manufacture of phosphoric acid by the wet process .Considering a huge amount of PG discharge , and a wide demand of cement in infrastructure construction , utilizing PG in cement manufacture is an encouraging approach .This paper firstly reviewed the current challenges of using PG in ordinary Portland cement ( OPC ) and calcium sulfoaluminate cement (SAC) manufacturing.Then, the application of using PG in SAC production is discussed as a new promising way to utilize PG .When using PG to produce SAC as one of raw materials , PG can render calcareous material for OPC and SAC production .But the negative impact of impurities in PG on properties of SAC can also be eliminated by the calcination processing . However , further researches are needed to increase the decomposition rate of PG . Sulfate-rich SAC cement can be produced by adding excess PG in raw materials , in that way the decomposition rate of PG can be increased .In addition , the impurities in PG can be used as functional component to modify the setting of SAC .
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