利用酸碱化学方法研究磷石膏分解渣中氧化钙的提纯工艺,并结合XRD、SEM、EDS手段表征提纯物物相和光谱特征等.结果表明,通过加入去离子水和盐酸可以有效除去渣中可溶性二氧化硅和酸不溶物,经氢氧化钠处理后的物料在1050℃煅烧3.5h,形成的样品中氧化钙纯度达到89％,其结构密实紧凑,表面分布均匀,色度较高.提纯过程中,磷石膏分解渣、去离子水、盐酸和氢氧化钠的最佳质量比为5∶15:6∶8.
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