磷石膏用作水泥缓凝剂时，其中含有的杂质对水泥的性能产生不利影响，因此使其应用受到限制。
Impurities from phosphogypsum had deleterious effect on the property of cement when used as cement retarder, which caused limited application.
杂质对水泥性能影响不大，不经预处理作水泥缓凝剂，其性能与采用天然石膏的水泥相当。
The properties of cement with titanium gypsum are similar to those of Portland cement with natural gypsum.
深度越大，为完成注水泥作业所需的时间越长，而且由于升高的温度对水泥浆凝固过程的影响，因而对水泥浆缓凝的需求也越高。
The need for cement retardation increases with depth due to the greater time required to complete the cementing operation and the effect of increased temperature on the cement-setting process.
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