关键词: 羰基合成废铑液, 焙烧, 铑回收, 木炭粉

Abstract:

Rhodium resources are scarce and the price of rhodium is expensive.Rhodium trichloride is the raw material of rhodium catalyst and other rhodium compounds.The content of rhodium in waste rhodium solution of carbonyl synthesis is usually several hundred to several thousand milligrams per kilogram，the recovery of rhodium to prepare rhodium trichloride is of great significance.At present，the recovery of rhodium from waste rhodium liquid mainly adopts the incineration method，which has large rhodium loss and rhodium overfiring，subsequent processing difficulties and other problems.In order to solve these problems，a two-stage roasting process for recovery of rhodium from carbonyl synthesis by adding charcoal powder from aerobic roasting to oxygen-free roasting was explored.The process was simple and had a high recovery rate.The main process could be summarized as follows：the waste rhodium solution was distilled to obtain concentrated rhodium slag，and the rhodium slag was added with 0.6 times of charcoal powder，and roasted from room temperature to 600 ℃ under aerobic conditions.After being roasted at 600 ℃ for 3 h，the roasting temperature was rosed to 1 100 ℃ under the condition of no oxygen and remained at 1 100 ℃ for 1 h，the active rhodium ash was obtained when the temperature was lowered to room temperature.Then the active rhodium ash was dissolved in the acid.Finally，rhodium trichloride was obtained by purification and concentration，yield was higher than 99.0%.

Key words: waste rhodium solution of carbonyl synthesis, roasting, rhodium recovery, charcoal powder