脱硫石膏制备半水石膏晶须的研究
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摘要
脱硫石膏是电厂湿法烟气脱硫的固体废弃物,不仅造成资源浪费,还会对环境产生污染。为提高脱硫石膏的附加值,以脱硫石膏为原料,采用盐溶液法制备半水石膏晶须,研究了氯化钠浓度、温度、液固比、p H对转化率的影响,并研究了柠檬酸的含量对形貌的影响。采用傅立叶变换红外光谱仪(FTIR)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)等对制备的半水石膏晶须做了表征,并研究了柠檬酸对形貌影响的机理。研究表明:当氯化钠质量分数为20%、反应温度为100℃、液固比为5∶1、反应时间为2 h、柠檬酸的质量分数为0.25%时,可制备出长度为50~100μm、长径比为(30~50)∶1的半水石膏晶须。
Desulfurized gypsum is the solid waste from wet flue gas desulfurization technology of power plants.It can not only waste valuable resources,but also pollute the environment.In order to promote the added-value of utilization,hemihydrate gypsum whiskers were prepared by salt solution method and using desulfurized gypsum as materials.The influences of the concentration of sodium chloride,reaction temperature,ratio of liquid to solid,and p H on conversion rate and the effect of the content of citric acid on morphology were investigated.The hemihydrate gypsum whiskers were characterized by scanning electron microscopy,X-ray diffraction and infrared spectroscopy instruments.The mechanism of the effect of citric acid on the morphology was also studied.The results showed that the best technological conditions were as follows:mass fraction of sodium chloride was 20%,reaction temperature was 100 ℃,reaction time was 2 h,ratio of liquid to solid was 5∶1,and mass fraction of citric acid was 0.25%.Under the optimal conditions,the length of hemihydrate gypsum whiskers was 50 ~100 μm and the slenderness ratio was(30~50)∶1.
Desulfurized gypsum is the solid waste from wet flue gas desulfurization technology of power plants.It can not only waste valuable resources,but also pollute the environment.In order to promote the added-value of utilization,hemihydrate gypsum whiskers were prepared by salt solution method and using desulfurized gypsum as materials.The influences of the concentration of sodium chloride,reaction temperature,ratio of liquid to solid,and p H on conversion rate and the effect of the content of citric acid on morphology were investigated.The hemihydrate gypsum whiskers were characterized by scanning electron microscopy,X-ray diffraction and infrared spectroscopy instruments.The mechanism of the effect of citric acid on the morphology was also studied.The results showed that the best technological conditions were as follows:mass fraction of sodium chloride was 20%,reaction temperature was 100 ℃,reaction time was 2 h,ratio of liquid to solid was 5∶1,and mass fraction of citric acid was 0.25%.Under the optimal conditions,the length of hemihydrate gypsum whiskers was 50 ~100 μm and the slenderness ratio was(30~50)∶1.
引文
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[4]李鸿魁,李新平,王惠琴,等.石膏微纤维用于纸张增强的初步研究[J].中国造纸,2005,24(2):23-25.
[5]刘菲菲,王玉珑,覃盛涛,等.硫酸钙晶须溶解抑制改性及其在纸张中的应用[J].造纸化学品与应用,2012(1):21-23.
[6]刘焱,于钢.石膏纤维对纸张增强作用的研究[J].中华纸业,2009,30(18):63-65.
[7]陈学玺,崔波.磷石膏晶须与天然石膏晶须在造纸上的应用[J].西南造纸,2006,35(5):31-32.
[8]郭会宾,张兴儒.Na Cl盐溶液制备半水石膏的工艺条件研究[J].青海大学学报:自然科学版,2013(2):24-31.
[9]胥桂萍,童仕唐.从FGD残渣中制备α型半水石膏结晶机理的研究[J].吉林化工学院学报,2002,19(1):9-12.
[10]胥桂萍,童仕唐.从FGD残渣制备α型半水石膏过程晶形的控制[J].吉林化工学院学报,2002,19(2):3-7.
[11]杭州大学化学系分析化学教研室.化学分析手册第一分册基础知识与安全知识[M].第2版.北京:化学工业出版社,1997:162.
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