Recovery of Copper and Chromium from Spent Catalyst Cupric chromate by pressure sulphuric acid leaching

摘要

A new approach of recovery of copper and chromium from spentcatalyst cupric chromate is developed which is from furfuryl alcohol (FFA) production by furfural (FFR) hydrogenation. The organic mixture will be recovered from the solid waste by vacuum pressure distillation at 130 °C. After refining workshop, qualified FFR and FFA will be produced. The spent cupric chromate catalysts after withdrawing the organic matter mixed with sulphuric acid and 72% perchloric acid, then separately reacted for 8h at180 in °Cpressure cauldron. The effects of influence leaching rate of the spent cupric chromate catalyst such as sulphuric acid concentration ,the addition of perchloric acid, reaction time and temperature were investigated for determining the optimum conditions. The optimum conditions for maximum leaching rate of the spent cupric and chromic catalysts were determined as follows: 80% sulphuric acid mixed with 72% perchloric acid 1:0.05, reaction temperature180 ,°C reaction time h.The recycling rate of spent cupric chromate catalyst was more than 99%.