METHOD OF IRON POWDER PRODUCTION Russian patent published in 2014 - IPC B22F9/06 B82Y30/00 

FIELD: metallurgy.

SUBSTANCE: method of iron powder production involves preparation of iron-carbon melt with the carbon content of 3.9-4.3 wt %, its spraying into water by compressed air, dehydrating, drying to produce raw powder with the proportion of concentration of oxygen to carbon being equal to 1.1-2.0, and grinding down to the particle size of maximum 0.250 mm. The ground raw powder is mixed with granulated iron oxides produced from waste rolling muriatic pickling solutions, with the concentration of impurities of maximum 2 wt % and granule size of maximum 0.160 mm. Concentration of granulated iron oxides in the mix with iron powder is determined, then the obtained mix is annealed in a furnace under the temperature of 950-1000°C for 1.5-2 hours in the layer of 25-35 mm high on a continuously moving band, crushing with the isolation of proper fraction of iron powder with the particle size of less than 0.200 mm.

EFFECT: production of high quality iron powder with high chemical purity, satisfactory fluidity, high compressibility and increased strength of pressing.

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