Phosphogypsum is a solid waste discharged during the wet production of phosphoric acid,which contains a small amount of impurities such as phosphorus and fluorine and seriously endangers the surrounding ecological environment such as atmosphere,soil,and groundwater.The underfloor heating module is an integrated underfloor heating plate that uses insulation board grooves to fix and protect the heating pipe,and can evenly heat.It can greatly simplify the underfloor heating installation process,reduce the thickness of underfloor heating,and make underfloor heating more energy-efficient.The calcination and aging treatment of phosphogypsum as raw material were carried out firstly.Then the phosphogypsum was modified by adding organic emulsion and hydraulic cementing material,and its modification mechanism was analyzed as well.Finally,the modified phosphogypsum was foamed to prepare phosphogypsum floor heating module,and its density,thermal conductivity,volume water absorption,strength and combustion grade were tested and analyzed.Mmodified phosphogypsum is used to prepare foamed board module,which not only broadens the selection of insulation materials for floor heating module,but also provides a new idea for comprehensive exploration and utilization of phosphogypsum.
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