基于烟气脱硫的碱式硫酸铝吸收剂Al^(3+)含量测量试验  

Experimental study for finding the Al^(3+)-content rate of the basic aluminum-sulfate absorbent based on the flue gas desulfurization

作　　者：张子敬[1] 孙世昌[1] 汪建文[1] 温高[1] 高艺[1] 朗林茂 

机构地区：[1]内蒙古工业大学能源与动力工程学院,呼和浩特010051

出　　处：《安全与环境学报》2015年第5期273-277,共5页Journal of Safety and Environment

基　　金：内蒙古自治区高等学校科学研究项目(NJZY14063;NJZY13118);内蒙古工业大学重点基金项目(ZD201114)

摘　　要：为了准确测量碱式硫酸铝溶液中Al3+质量浓度,以PAN为指示剂,用Cu SO4标准溶液反滴定EDTA,分析得到4个干扰因素的优化测量条件。结果表明,碱式硫酸铝溶液中Ca2+对Al3+质量浓度测量无干扰,最佳稀释倍数应以待测液稀释后Al3+质量浓度在0.141~0.423 g/L为目标确定,EDTA最佳过量程度为50%~150%,Al3+与EDTA最佳配位应控制p H=3.42~3.91、煮沸3~5 min。误差分析表明,试验平均方法回收率为98.86%,Al3+质量浓度实测值较理论值相对误差范围为-0.47%^-0.33%,标准偏差为0.002 g/L,相对标准偏差(RSD)小于1%,试验结果准确可靠、数据稳定。以XO作指示剂、锌盐溶液为标准溶液返滴定对比试验表明,由于受到Al3+对指示剂的封闭作用,滴定终点难以判断,实测值较理论值相对误差范围为-2.62%~3.42%,测量结果平均准确度降低2.156%。In this paper,we would like to focus our attention on studying the aluminum content rate of the basic aluminum sulfate absorbent based on the flue gas desulfurization. So far as we know,in order to measure Al3 ＋concentration of the basic aluminum sulfate solution accurately,it is necessary to titrate EDTA by using the Cu SO4 standard solution with PAN as the indicator so as to optimize the measurement conditions of the four interference factors. Since alkalinity and aluminum content are the chief influential factors for defining the desulfurization characteristics of the basic aluminum sulfate-desorption desulphurization,such factors are the key parameters needed to be adjusted and controlled in the study of desulfurization method,the Al3 ＋concentration in the solution should be the key influential factor for calculating the alkalinity and aluminum content rate. What is more,it is necessary to analyze the calculation errors in the process of the experiment and determine the feasibility of the measuring method by taking into full account the different scopes of interference factors that may affect the measurement accuracy and compare the measuring results and the standard sample Al3 ＋concentrations. The results of our experimental study show that Ca2 ＋in the basic aluminum sulfate solution does not interfere the measurement of Al3 ＋content,whereas the diluted Al3 ＋concentration rate should be 0. 141-0. 423 g / L,which can be regarded as the target determining the optimal dilution ratio. In addition,the optimal excessive rate of EDTA is between 50%-150%,with the optimal coordination of Al3 ＋and EDTA being controlled in p H = 3. 42-3. 91 and boiled for 3-5 mins. The error analysis can help us to find that the average method recovery rate is 98. 86%,whereas the relative error range is between- 0. 47% to- 0. 33%,when the measured value of Al3 ＋concentration can be compared with the theoretical value,with the standard deviation being 0. 002 g / L and the relative standard deviation（ RSD） being less

关 键 词：环境工程学 碱式硫酸铝 铝含量 EDTA 

分 类 号：X511[环境科学与工程—环境工程]