烟气脱硫石膏中微量可溶性杂质的存在形态分析

Study on the Configuration of Soluble Impurities in Flue Gas Desulfurization Gypsum

采用无水乙醇、稀硝酸、去离子水冲洗和加热等处理措施对烟气脱硫石膏进行了不同的处理,运用离子发射光谱仪(ICP)和离子色谱仪(ICS)研究了脱硫石膏中可溶性杂质离子(钠离子、镁离子和氯离子)的存在形态。结果表明,氯离子并未进入石膏晶格,而是存在于液相包含物中;部分镁离子可能替代钙离子进入石膏晶格;大部分钠离子存在于液相包含物中,小部分钠离子进入了脱硫石膏的晶格。

Procedures of rinsing with alcohol, nitric acid and deionized water were employed for the treatment of flue gas desulfurization （FGD）. Then the quantity and configuration of soluble impurity ions（sodium ion, magnesium ion and chloride ion） in FGD gypsum were analyzed with the aid of ICP and ICS. The results show that Cl- does not occur in the lattice of FGD gypsum but exists in fluid inclusions; some Mg,2＋ may substitute for Ca2＋ in FGD gypsum; most of Na＋ exists in fluid inclusions and a few of Na＋ probably exists in gypsum lattices.