Recovery of Tungsten and Vanadium from Spent SCR Catalysts by Ion Exchange

• Main Authors: Chia-YingWu, 吳佳穎
• Other Authors: Yun-Hwei Shen
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/3tkjdp

碩士 === 國立成功大學 === 資源工程學系 === 103 === With rapid economic development throughout the industry, the increase of mobile combustion engines, power plants and other incineration processes are the main sources of air pollution. Selective catalytic reduction (SCR) is one of the NOx treatment methods; it can offer higher NOx control efficiency and produces harmless N2 and H2O as end products. After a period of time, the SCR catalysts will be poisoned due to contamination and result in catalytic deactivation. Therefore, this study demonstrates the combination of the two unit processes to recover tungsten and vanadium from spent SCR catalysts. Those two unit processes are Na2CO3 roasting-hot water leaching and ion exchange. When the pH value of solution was about 12.16, the IRA900 could adsorb anions such as HVO42-, V2O74-and WO42- . The exchange capacity was determined to be 4.16g V/L resin , 69.58g W/L resin. At pH value range of 8.5~9.5,the IRA900 could selectively load HV2O73- from the solution, the exchange capacity was determined as 65.25g V/ L resin. Under strongly basic condition ( pH 13.34), the IRA900 selectively loads WO42- from the solution, the exchange capacity was determined as 42.72g W/L resin. The results of elution tests showed that the loaded metals could be easily eluted with 2M NaCl+1M NaOH or 5N NH4Cl+2N NH4OH and a 90% metal recovery was reached.