Preparation and properties of phosphogypsum-based phase change materials by chemical foaming method
The porous phosphogypsum matrix material was prepared by chemical foaming method with phosphogypsum as raw material,citric acid and calcium carbonate as foaming agent,calcium stearate as foam stabilizer,and fly ash as auxiliary agent.Using paraffin as phase change material,phosphogypsum-based phase change energy storage materials were prepared by impregnation method.The effects of cal-cium carbonate,citric acid,calcium stearate,and fly ash on the porosity and mechanical properties of the modified porous phosphogypsum matrix material were investigated.The characterization techniques of XRD,SEM,FTIR,DSC,and TG were used to analyze the structure and performance of phosphogypsum-based phase change energy storage materials.The results show that with the increase of the dosage of each additive,the porosity of the phosphogypsum matrix material increases gradually,and the compres-sive strength decreases gradually.The response surface optimization process experiment results show that when the mass percentage of calcium carbonate is 6.4%,citric acid is 3.2%,calcium stearate is 3.3%,and the content of fly ash is 18%,the porosity of the prepared phosphogypsum matrix material reaches the largest value of 64.53%.FTIR results show that no new diffraction peaks appear meaning no chemical reaction occurs between the modified phosphogypsum and paraffin and they are only physi-cally mixed;DSC results show that the phase change temperature of the prepared phosphogypsum com-posite phase change material is 58.88℃,the enthalpy of phase transition is 92.95 J/g.Combining phosphogypsum and paraffin to prepare phosphogypsum-based phase change materials with heat storage capacity can be used as building energy-saving materials,which provides a new technical path for resource utilization of phosphogypsum.
万方数据
维普
