从废脱硝催化剂中回收有价金属钨的研究
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摘要
用碳酸钠浸出结合季铵盐萃取工艺从失效脱硝催化剂中回收钨。结果表明,在浸出条件为碳酸钠浓度100 g/L、液固比2∶1、浸出温度180℃、浸出时间3 h时,钨的浸出率可达98.5%。浸出液经过三辛基甲基氯化铵萃取、碳酸氢铵溶液进行反萃,可在水相中得到高浓度的钨酸铵溶液,并与溶解在有机相之中的Fe、K等杂质元素进行高效分离。
Tungsten is recovered from spent De-NOX catalyst through the combined process of soda leaching and quaternary ammonium salt extraction. The experiment results show that the leaching rate of tungsten can reach to 98.5% under the leaching conditions as follows: soda concentration of 100 g / L, liquid-solid ratio of 3∶1, leaching temperature of 180℃ and leaching time of 3 hours. A high concentration of ammonium tungstate solution is obtained in the aqueous phase and separated from the impurities such as Fe and K after trioctylmethylammonium chloride extraction and bicarbonate solution stripping.
Tungsten is recovered from spent De-NOX catalyst through the combined process of soda leaching and quaternary ammonium salt extraction. The experiment results show that the leaching rate of tungsten can reach to 98.5% under the leaching conditions as follows: soda concentration of 100 g / L, liquid-solid ratio of 3∶1, leaching temperature of 180℃ and leaching time of 3 hours. A high concentration of ammonium tungstate solution is obtained in the aqueous phase and separated from the impurities such as Fe and K after trioctylmethylammonium chloride extraction and bicarbonate solution stripping.
引文
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[3]杨超,程华,黄碧纯.抗SO2和H2O中毒的低温NH3-SCR脱硝催化剂研究进展[J].化工进展,2014,(4):907-913
[4]谭青,冯雅晨.我国烟气脱硝行业现状与前景及SCR脱硝催化剂的研究进展[J].化工进展,2011,30(S1):709-713
[5]朱崇兵,金保升,仲兆平,等.碱金属氧化物对V2O5-WO3/Ti O2催化剂脱硝性能的影响[J].环境化学,2007,26(6):783-786.
[6]云端,宋蔷,姚强.V2O5-WO3/Ti O2SCR催化剂的失活机理及分析[J].煤炭转化,2009,32(1):91-96.
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[8]K.H.Carpenter,黄伦光.生产偏钨酸铵的方法[J].湿法冶金,1986,(3):50-53.
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