摘要
以某化工厂磷石膏为研究对象,通过XRD、FI-TR、SEM以及化学分析等方法测试与表征得出不同粒径下生料以及陈化半年后的磷石膏杂质含量、微观形貌、晶体特性的变化.研究表明:总磷含量随磷石膏粒径的减小从 1.07%逐渐增加至 1.46%;可溶氟含量由0.58%降低到0.10%;铁含量由0.35%增至0.72%;有机质含量减少了 17.6%;短期陈化不会改变磷石膏的pH值.此外,陈化过程会影响磷石膏各粒级的质量分布,并且增大磷石膏的平均粒径;粒径较大的磷石膏中存在的杂质含量高于粒径较小的磷石膏;磷石膏部分物相CaSO4·2H2O在陈化过程中会失去结合水转化为CaSO4·0.5H2O,部分晶型由菱形变为短棒状.
Abstract
X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FT-IR),field emission scanning electron microscopy(SEM),and chemical analysis were employed to investigate the variation of impurity content,microstructure,and crystal characteris-tics of raw and aged phosphogypsum from a chemical factory at different particle sizes.The results showed that the total phospho-rus content gradually increased from 1.07%to 1.46%with decreasing particle size,the soluble fluorine content decreased from 0.58%to 0.10%with decreasing particle size;the iron content increased from 0.35%to 0.72%,the organic matter content decreased by nearly 17.6%,short-term aging did not change the pH of phosphogypsum,in addition,the aging process affected the mass distri-bution of the phosphogypsum in each particle size and increased the average particle size of phosphogypsum.The impurity content in phosphogypsum with larger particle sizes was higher than that in phosphogypsum with smaller particle sizes.Phosphogypsum ag-ing under part of the physical phase CaSO4·2H2O in the aging process will lose the binding water converted to CaSO4·0.5H2O,part of the crystalline form from rhombic to short rod.
维普
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