METHOD OF PRODUCING NANOSTRUCTURED FERRITE POWDERS AND APPARATUS FOR REALIZING SAID METHOD Russian patent published in 2018 - IPC C01G49/00 B82B3/00 B82Y30/00 C01G29/00 C01G45/00 C01F17/00 C01D15/00 C01B13/18 B22F9/14 B01J19/10 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. Method for producing nanostructured ferritic powders includes the preparation of a mixture of nitric acid salt and at least one metal oxide compound, ultrasonic treatment, heat treatment and filtration. Obtain a mixture of ferric nitrate and at least one metal oxide selected from the group of manganese, bismuth, lithium, yttrium, or lithium carbonate at a molar ratio of ferric nitrate : metal oxides or lithium carbonate of equal (2–10):(1–5). Alternatively, it can be obtained: a mixture of ferric nitrate and at least one metal oxide selected from the group of manganese, bismuth, yttrium, or lithium carbonate in tartaric acid or ethylene glycol at a molar ratio of ferric nitrate: metal oxides or lithium carbonate:tartaric acid or ethylene glycol equal to (2–10):(1–5):(4–12). Ultrasonic processing is carried out with a frequency of 1.7 MHz at a radiation power of 20 W for 4 hours in an air current that is supplied at a speed of 0.014–0.15 m/s. Heat treatment is carried out in three stages: at 300–350 °C in the first stage; at 700–900 °C in the second stage and at 120–150 °C in the third stage. Filtration is carried out using an electrostatic precipitator, the corona electrode of which is supplied with a voltage of 6–9 kV. Apparatus for producing nanostructured ferritic powders contains a vessel for the initial solution, a thermochemical reactor whose housing is provided with four heaters, ultrasonic atomizer, an air flow booster and an electrostatic precipitator equipped with a precipitation and corona electrode. Reactor housing is designed as a tubular furnace. As an air flow booster, a compressor connected through a pressure regulator and a needle valve with an ultrasonic atomizer is used.

EFFECT: invention makes it possible to obtain nanostructured powders of ferrites with a highly developed porous surface and particles having the shape of a sphere.

2 cl, 12 dwg, 5 ex