Method of preparing two kinds of perferrate at the same time

Abstract

A process for simultaneously preparing potassium ferrate and barium ferrate used for battery or water-treating material includes such steps as adding potassium iodide to KOH solution, filling Cl gas, adding KOH solid until dissolving, cooling, filtering, collecting the filtrate containing potassium hypochlorite, adding at least one of iron nitrate, iron sulfate and iron chloride, adding it to cooled KOH solution at O deg.C, filtering to obtain coarse potassium ferrate, dissolving it in KOH solution, filter, recrystallizing in KOH solution, filtering, baking the filtered dregs to obtain potassium ferrate, deluting the filtrate, cooling, mixing it with barium chloride (or acetate) in KOH solution, filtering, washing the dregs and baking to obtain barium ferrate.

Description

technical field

[0001] The invention relates to a ferrate material, in particular to a method for preparing ferrate which can be used as battery and water treatment material. Background technique

[0002] In 1999, Professor S. Licht, chairman of the Electrochemical Society of Israel, first proposed that ferrate can be used as a battery cathode material. This material has a high electrochemical capacity. The zinc-ferrate battery they developed has a capacity 50% higher than that of zinc-manganese batteries. above, and the reversibility and discharge platform of the battery are high. The reason why the ferrate battery has a high capacity is because the iron in the ferrate is hexavalent, and it will lose 3 electrons during discharge, while the manganese dioxide battery material currently used as a zinc-manganese battery can only lose 2 electrons at most. The nickel oxyoxide used as a nickel series rechargeable battery can only realize the gain and loss conversion of one electr...