Leaching of V and W fromspent SCR catalyst - Effect of agitation on leaching rates [废脱硝催化剂钒, 钨的浸出-搅拌对浸出率的影响]

作者：Chen Y.; Jin K.; Chen J.; Zhao C.; Xia Q.^*

来源：Journal of Functional Materials, 2020, 51(3): 03001-03006.

DOI：10.3969/j.issn.1001-9731.2020.03.001

• Agitation
• Dynamics
• Recovery
• Spent SCR catalyst
• V
• W

It is of great economic and social benefits for the recovery and reuse of valuable metals in waste SCR denitrification catalysts. In this paper, the vanadium and tungsten ions in waste denitrification catalyst were leached by NaOH and the factors affecting the leaching rates were investigated. Results showed that increasing the leaching temperature and NaOH concentration were beneficial to the leaching of vanadium and tungsten. The leaching rates of vanadium and tungsten could reach 100% under the condition of liquid-solid ratio of 3.5:1, leaching temperature of 160 ℃, NaOH concentration of 40%, and the leaching time of 3.5 h. The process of tungsten ion leaching was controlled by solid membrane diffusion. Under agitation condition (350 r/min), the apparent activation energy of tungsten leaching was 29.28 kJ/mol, while without agitation, the apparent activation energy was only 1.26 kJ/mol. Agitation could increase the diffusion rate, reduce the diffusion resistance, and enhance the leaching rates vanadium and tungsten.

• 单位
  华南理工大学