为回收利用废弃选择性催化还原(SCR)催化剂,采用酸化伯胺N1923从钠化焙烧废SCR催化剂的浸出碱液中萃取分离钨(W),并对萃取参数进行了优化。结果表明,在溶液pH为10、N1923质量分数为10%、水相和有机相的相比为1、时间为4 min和温度为25℃时,W的单级萃取率高达99.28%;溶液中的其他元素P、V和Si的萃取率分别为55.44%、96.70%和55.00%;用硫酸洗涤除去共萃的杂质元素P、V和Si,W的损失可忽略不计,氨水可以从有机相中反萃出96.89%的W得到钨酸铵溶液。利用傅里叶红外光谱仪分析了萃取过程,N1923经H₂SO₄预酸化后转化为伯胺盐(RNH⁺₃),通过阴离子交换萃取了WO^2-₄。

To recycle spent selective catalytic reduction (SCR) catalysts,the acidified primary amine N1923 is used to extract tungsten (W) from the leaching alkaline solution of spent SCR catalysts roasted with sodium.The optimized extraction conditions are obtained as follows:the pH of the solution is 10,the concentration of N1923 is 10%(v/v),the ratio of aqueous phase to organic phase is 1,the contact time is 4 min and the temperature is 25℃.Under these conditions,the single-stage extraction rate of W is as high as 99.28%.In addition,the extraction rates of P,V and Si are 55.44%,96.70% and 55.00%,respectively.The co-extracted impurity elements (P,V,Si) are removed by sulfuric acid washing with negligible loss of W,and ammonia can strip 96.89% of W from the organic phase to get ammonium tungstate solution.The extraction process is analyzed by using FT-IR,and the result indicates that N1923 is converted into primary amine salts (RNH⁺₃) after acidification with H₂SO₄,which extracts WO^2-₄ through anion exchange.

肖海兵(1996-),男,硕士研究生,主要研究方向为矿物绿色加工回收,1103194741@qq.com。