METHOD OF OBTAINING FINE-CRYSTALLINE FERRITE-CHROMITES WITH SPINEL STRUCTURE Russian patent published in 2021 - IPC C01G9/00 C01G37/00 C01G49/00 C01B13/18 C30B29/26 C04B35/26 B82Y30/00 B01J23/06 B01J23/86 B01J37/08 

FIELD: chemical industry.

SUBSTANCE: invention can be used in the chemical industry for the production of butadiene and the conversion of carbon monoxide (II). The method of obtaining fine-crystalline ferrite chromites with a spinel structure includes homogenizing the initial oxides of zinc (II), iron (III) and chromium (III). A mixture of oxides is obtained by the decomposition of solutions of zinc (II), iron (III) nitrates, chromium sulfate (III) with a concentration of 1 mol/L. A 10-20% ammonia solution with a concentration of 14 mol/L and a 25-35% citric acid solution with a concentration of 6.25 mol/L are introduced into the mixture of solutions with stirring. The resulting mixture is evaporated for 10-30 minutes. After that it is calcined for 10-20 minutes at 500-700°C until gas formation stops. Then heat treatment is carried out at 900°C for 30 minutes.

EFFECT: invention makes it possible to simplify the heat treatment mode and reduce its duration, reduce the energy consumption when obtaining fine-crystalline zinc ferrite chromites, and increase the surface area of the material obtained.

1 cl, 3 dwg, 1 tbl, 3 ex