磷石膏分解渣中氧化钙的分离纯化及表征  

Purification and Characterization of Calcium Oxide in the Phosphogypsum Decomposition Slag

作　　者：戴取秀[1] 马丽萍[1] 谢龙贵[1] 毛宇[1] 张杭[1] 马俊[1] 

机构地区：[1]昆明理工大学环境科学与工程学院,昆明650500

出　　处：《材料导报》2013年第8期133-137,共5页Materials Reports

基　　金：国家自然科学基金(21176108);国家高技术发展计划"863"项目(2011AA06A106)

摘　　要：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。Purification method of calcium oxide in phosphogypsum decomposition slag was studied on the basis of an acid-base chemistry method. The phase and the spectral signature of purified samples were characterized and ana- lyzed by XRD, SEM and EDS. The result shows that, the soluble silicon dioxide and the acid-insoluble material in the slag are effectively removed by de-ionized water and hydrochloric acid. The content of calcium oxide in the purified gyp- sum slag which was calcined at 1050 ℃ for 3. 5 h after being treated by sodium hydroxide increases to 89%, and the product also has a compact structure, well-proportioned surface and higher chroma. The optimum mass ratio of the decomposition product of phosphogypsum, de-ionized water, hydrochloric acid and sodium hydroxide is 5 ： 15 ： 6 ： 8 in the purification process.

关 键 词：磷石膏分解渣 氧化钙 提纯 表征 

分 类 号：TQ132.32[化学工程—无机化工]