US 2021/0047201 A1 · METHOD FOR PREPARING HIGH-VALENCE IRON SALT

Abstract

A method for preparing high-valence iron salt; the present invention relates to a method for preparing a ferrate compound, for solving the technical problems of the complex operating process, the low yield, and the low purity of ferrate products after purification in existing methods for preparing potassium ferrate. The preparation method comprises: 1. weighing solid potassium hydroxide; 2. adding the solid potassium hydroxide to a sodium hypochlorite solution to obtain a hypochlorite solution; 3. adding iron salt to the hypochlorite solution to obtain a potassium ferrate solution; 4. adding the potassium ferrate solution to a cooled potassium hydroxide solution to obtain a solid-liquid mixture; 5. filtering the solid-liquid mixture of step 4; and 6. rinsing the solid-phase substance. The present invention has safe operation, is simple, quick, energy-saving, and easy to control, is suitable for immediate use, and the obtained product can be stored stably; the ferrate yield of the present method is 60-95% and the purity of the produced potassium ferrate solid is over 95%.

Claims10

Dependent claims

A method of preparing high-valent iron salt, characterized in that said method is realized by the following steps of:

(1) obtaining and weighing solid potassium hydroxide;
(2) adding the potassium hydroxide in solid form from the step (1) to sodium hypochlorite solution, during the process, controlling a temperature of the reaction solution at 0° C.-20° C. to obtain a hypochlorite solution;
(3) adding iron salt to the hypochlorite solution obtained in the step (2) so that a molar ratio of hypochlorite to iron salt is 0.5-8:1, then resulting a potassium ferrate solution;
(4) Cooling potassium hydroxide solution with a concentration of 10 mol/L 22 mol/L to a cooling temperature of 0° C.-10° C., then adding the potassium ferrate solution in the step (3) to the cooled potassium hydroxide solution and mixing uniformly to obtain a solid-liquid mixture;
(5) Filtering the solid-liquid mixture from the step 4 to collect a solid phase substance;
(6) Washing the solid phase substance collected from the step (5) to obtain a solid product of high-valent iron salt.

3 more elements

Dependencies are inferred from the claim text.

Method for preparing high-valence iron salt

Life of this patent

Method for preparing high-valence iron salt

Life of this patent

Abstract

Claims10