Making iron powder

Details Making iron powder Making iron powder

B - Operations, Transporting

22

F

18/500.4

B22F 9/08 (2006.01)

Patent

CA 1112822

ABSTRACT OF THE DISCLOSURE Iron powder of high compressibility and low bulk density is made by atomizing a stream of molten steel by means of a conical jet of water from a nozzle downstream of a nozzle chamber at a rate in excess of 10 cubic meters water per metric ton of steel, the half cone angle is between 40° and 60°, preferably 45°; and air suction is provided in a region upstream from the cone, adjacent to the stream at a pressure of 0.02 to 0.20 bars below ambient, by means of a length adjustable tube extending down from the nozzle chamber. The powder is reduced at 1,000°C to 1,200°C, and the resulting cake is broken up to obtain a powder having a particle size distribution with a higher content of larger particles than the powder immediately resulting from the atomization. The iron powder combines high compressibility with high green strength of an article formed there- from by pressing of the powder.

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