Abstract: White mud wet flue gas desulfurization has achieved industrial application,but physical and chemical properties of white mud desulfurization slurry and gypsum rarely reported.Therefore the physical and chemical properties of white mud desulfurization slurry and gypsum were studied.Moisture content and pH were measured.The physical and chemical properties of white mud,white mud slurry and white mud gypsum were analyzed by XRD,XPS,laser particle size distribution,ICP-MS,ion chromatograph dialogue and SEM. The influence of paper-making process to mud composition was considered,also the cause of the changes in color of white mud and white mud slurry was discussed.The results showed that the physical and chemical properties of white mud and limestone have obvious differences:The pH of white mud was higher than that of limestone,and the moisture content of white mud was up to 40%; Na,K,Mg content in white mud was higher than that of limestone; The soluble salt in white mud slurry was too high,but the heavy metal content was low; white mud gypsum quality is better,but the soluble salt may influence the application of gypsum.White mud can be used a wet flue gas desulfurization? absorbent instead of limestone,however,the effects of different physical and chemical properties between white mud and limestone in wet flue gas desulfurization require further research.

Key words: white mud desulfurization, physical and chemical properties, white mud slurry, white mud gypsum

摘要： 目前白泥湿法烟气脱硫已实现工业化应用，但对白泥脱硫浆液与石膏理化特性方面鲜有报道，因此对白泥脱硫浆液与石膏理化特性进行了研究。实验中测定了白泥的含水率、pH，采用XRD、XPS、激光粒度分布仪、ICP-MS、离子色谱仪、SEM等对白泥、脱硫石膏及脱硫浆液进行理化特性分析；综合考虑了造纸过程对白泥成分的影响，探讨了白泥和白泥浆液颜色变化的原因。实验和分析结果表明，白泥的理化特性和石灰石有明显差异，白泥的pH高于石灰石，含水率最高可达40%，白泥中Na、K、Mg含量高于石灰石；白泥浆液溶解性盐过高，但重金属含量较低；白泥石膏质量较好，但溶解性盐对石膏应用可能产生影响。白泥可代替石灰石作为湿法烟气脱硫的吸收剂，白泥与石灰石理化特性差异对白泥应用于湿法烟气脱硫的影响有待更深入研究。

关键词: 白泥脱硫, 理化特性, 白泥浆液, 白泥石膏