METHOD OF PRODUCING NANOPOWDER OF COBALT FERRITE AND MICROREACTOR TO THIS END Russian patent published in 2017 - IPC B22F9/24 C01G49/02 C01G51/04 C30B29/26 B01F3/08 B01F5/08 B82B3/00 B82Y40/00 

FIELD: technological processes.

SUBSTANCE: method comprises supplying the primary components - a mixture of solutions of cobalt and iron salts in the ratio corresponding to stoichiometry CoFe₂O₄, and an alkali solution in proportion to the salts solutions providing acidity of the medium in the range from ₇ to 8, corresponding to the conditions of coprecipitation of the components, while the solutions of the primary components are supplied in the form of thin jets with a diameter of 50 to 1000 micron at the speed of 1.5 to 20 m/s colliding in the vertical plane at the angle of 30° to 160°, at the temperature in the range of 20°C to 30°C, and a pressure close to atmospheric pressure. The usage ratio of the primary components is set in such a way that when the jets collide, a liquid fog is formed in which the solutions of the primary components are mixed and engage. The microreactor for the method comprises a housing 1 and nozzles 2 with flow diffusers 3 for supplying primary components 10 and a nozzle 4 for products removal, the microreactor housing 1 is of a cylindrical shape with a conical bottom 5, a cover 6, the nozzles 2 with flow diffusers 3 for supplying primary components 10 are made with the possibility to provide fine adjustment of the jet direction, in the cover 6 coaxially to the housing 1 a nozzle 9 is provided for supplying purging gas, and an outlet nozzle 4 is installed in the bottom 5 to remove purge gas and reaction products. The area of the outlet nozzle 4 is 20-50 times bigger than the total area of all nozzles for supplying primary components. Two or more nozzles 17 may be installed in the cylindrical part of the housing to supply a surface-active substances solution in the form of thin jets with a diameter of 10 to 1000 micron, directed to the liquid fog of the primary components engaging solutions.

EFFECT: invention enables to reduce the temperature and pressure necessary to make a synthesis of oxide nanoscale cobalt ferrite particles, to reduce energy costs and ensure continuity of the process with the possibility of its implementation on an industrial scale, to reduce the cost of equipment, to increase yield and selectivity of the process, to provide optimal conditions for rapid reactions via maintenance of stable and effective hydrodynamic conditions for reagents contacting and rapid removal of reaction products.

3 cl, 5 dwg, 2 ex