Preparation of Potassium Ferrate by Wet Oxidation Method Using Waste Alkali: Purification and Reuse of Waste Alkali

摘要

A new method of preparing potassium ferrate using waste alkali is developed in this report. After preparation of potassium ferrate by the wet oxidation method, the waste alkali was purified and reused for a further preparation runs. The purification of waste alkali and the temperature for the furification were studied. The results indicated that the waste alkali can be used for preparing potassium ferrate, and the purity and yield of potassium ferrate product were steadily higher than 90% and 60%, respectively after ten recycles of the waste alkali. Therefore, due to the use of waste alkali, the cost is reduced sharply, and a green synthesis for potassium ferrate is achieved.