The Ammonia Leaching Method of Recycling the Spent Copper-Chromium Oxide Catalysts
The spent copper chromium oxide catalyst of furfural hydrogenation was recycled.by ammonia leaching method. This method not only has the characteristics of simple process, low cost, quick effect, but also avoids the use of various oxidants increasing the security of the experimental operation and the generation of carcinogen hexavalent chromium.The experimental results show that the optimum process conditions of ammonia leaching is: the concentration of ammonia 15mol / L, the leaching temperature is at 180 °C, leaching time for 4h, the optimal dosage of (NH4) 2SO4 0.6g/10g. The copper leaching rate can reach more than 80% of the maximum.
Z.S. Liu, L.P. Xu, X.D. Liang, Z.H. Wang and H.M. Zhang
Z. X. Li et al., "The Ammonia Leaching Method of Recycling the Spent Copper-Chromium Oxide Catalysts", Advanced Materials Research, Vol. 1015, pp. 430-433, 2014