Abstract：The determination of tungsten in waste SCR catalyst usually adopts alkali soluble-thiocyanate spectrophotometry. However, since the catalyst contains vanadium, and vanadium (Ⅲ) could form green complex with SCN-, leading to interference. The sample was fused with sodium peroxide in experiments followed by direct leaching and dilution with water. 1 g/L tartaric acid was added and the acidity of hydrochloric acid was controlled at 5%. W 207.912 nm was selected as the analytical line to determine tungsten in SCR denitrification catalyst by inductively coupled plasma atomic emission spectrometry (ICP-AES). It was found that the matrix interference could be eliminated only when the addition amount of sodium peroxide and tartaric acid was completely consistent with that in the prepared standard solution. The mass concentration of tungsten in the range of 2.00-20.00 μg/mL had good linear relationship with the emission intensity, and the correlation coefficient was 0.999 99. The limit of detection (mass fraction) and limit of quantification were 0.043% and 0.14%, respectively. The contents of tungsten in five waste SCR denitration catalyst samples were determined according to the experimental method, and no abnormal values were found in 11 times of testing by Grubbs test method. The spiked recoveries were between 99% and 101%. The proposed method effectively solved the difficulty for determination of tungsten in SCR denitration catalyst. It was applicable for the determination of tungsten (mass fraction of 0.50%-7.00%) in waste SCR denitration catalyst samples. It provided a new idea for the determination of tungsten in other products.
周礼仙.硫氰酸盐分光光度法测定镍基合金中钨[J].冶金分析,2017,37(8):78-82.ZHOU Lixian. Determination of tungsten in nickel base alloy by thiocyanate spectrophotometry [J]. Metallurgical Analysis,2017,37(8):78-82.
[5]
刘晶晶,杨威.碱熔-电感耦合等离子体质谱法测定镓矿石中镓、钼、钨[J].当代化工,2016,45(6):1261-1263.LIU Jingjing,YANG Wei. Determination of gallium, molybdenum and tungsten in gallium ore by alkali fusion inductively coupled plasma mass spectrometry[J]. Contemporary Chemical Industry, 2016,45 (6): 1261-1263.
[6]
韩晓.电感耦合等离子体原子发射光谱(ICP-AES)法测定铜原矿和尾矿中的多元素[J]. 中国无机分析化学, 2016,3(6):27-31.HAN Xiao.Determination of multi elements in copper ore and tailings by inductively coupled plasma atomic emission spectrometry (ICP-AES) [J]. Chinese Inorganic Analytical Chemistry,2016,3(6): 27-31.
[7]
苏春风.电感耦合等离子体原子发射光谱(ICP-AES)法测定再生锌原料中铜、铅、铁、铟、镉、砷、钙、铅[J].中国无机分析化学. 2016,1(6):53-58.SU Chunfeng. ICP-AES determination of copper, lead, iron, indium, cadmium, arsenic, calcium and lead in recycled zinc raw materials [J]. Chinese Inorganic Analytical Chemistry,2016,1 (6): 53-58.
[8]
姚慧,王坤,杨惠玲.SCR催化剂中钒钨钛含量的测定[J].中国测试,2018,44(8):47-51.YAO Hui,WANG Kun,YANG Huiling. Determination of vanadium, tungsten and titanium content in SCR catalyst[J]. Chinese Test, 2018,44 (8): 47-51.
[9]
刘子林,王宝冬,马瑞新,等.废SCR催化剂钠化焙烧回收钨和钒的机理探究[J]. 无机盐工业,2016(7):63-67.LIU Zilin,WANG Baodong,MA Ruixin,et al. Mechanism of recovery of tungsten and vanadium from spent SCR catalyst by sodium roasting[J]. Inorganic Salt Industry,2016(7): 63-67.
[10]
司金凤.SCR脱硝催化剂的重要指标分析[J].化工管理,2020(7):77-78.SI Jinfeng. Analysis of important indexes of SCR denitration catalyst[J].Chemical Management,2020 (7): 77-78.
[11]
高永利,徐生杰.浅析新型SCR催化剂的制备、成型及其脱硝中试应用[J].化工设计通讯, 2016(8):7.GAO Yongli,XU Shengjie.Reparation,molding and pilot scale application of new SCR catalyst[J].Chemical Engineering Design Communication,2016(8):7.
