Process for preparing solid potassium ferrate

Abstract

The preparation process of solid potassium ferrate includes the following steps: introducing chlorine into purified waste alkali solution to prepare hypochlorite solution; adding ferric nitrate into the solution to prepare potassium ferrate solution; adding solid potassium hydroxide, dissolving and filtering to obtain coarse potassium ferrate product; washing coarse potassium ferrate product with potassium hydroxide solution; filtering to obtain re-crystallized potassium ferrate product; washing with organic solvent and vacuum drying to obtain stable solid potassium ferrate product; collecting all the filtrate and treating for reuse. The present invention has the circulated utilization of waste alkali solution, low cost and less environmental pollution.

Description

【Technical field】

[0001] The invention relates to a method for preparing potassium ferrate, in particular to a method for preparing solid potassium ferrate for recycling spent caustic soda. 【Background technique】

[0002] Potassium ferrate exists in the form of hexavalent ions of iron, and its Fe element can transfer 3 electrons in the electrode reaction, which can be used as an electrode material to produce high-energy batteries. Due to the special chemical properties of potassium ferrate, its application potential in water treatment is huge. Tests have shown that potassium ferrate is a highly efficient multifunctional water purifier integrating disinfection, oxidation, flocculation, adsorption and coagulation assistance. And in the process of treating water with potassium ferrate, no toxic and harmful substances will be introduced or caused. However, at present, due to the limitation of product synthesis, relevant research is limited to disinfection, ecotoxicology and ge...