Process for producing metallic ultrafine powder

A burner which generates a high temperature reductive airflow from a fuel fluid and oxygen or oxygen-enriched air to reduce a metallic compound, thereby producing metallic ultra-fine powder having a particle size smaller than a particle size of a raw material, comprising:

• a raw material jetting hole for jetting the metallic compound as the raw material in a direction, with a fuel fluid as a carrier gas,
• plural primary oxygen jetting orifices disposed circularly around a center of said raw material jetting hole, for jetting oxygen or oxygen-enriched air parallel to said direction of jetting of said raw material, and
• plural secondary oxygen jetting orifices disposed circularly around a center of said raw material jetting hole and outward from said primary oxygen jetting orifices, for jetting oxygen or oxygen-enriched air toward a point on a line extended from said raw material jetting hole and parallel to said direction of jetting of said raw material.

A burner which generates a high temperature reductive airflow from an organic solvent and oxygen or oxygen-enriched air to reduce a metallic compound, thereby producing metallic ultra-fine powder, comprising:

• a raw material atomizing hole for atomizing a liquid raw material containing a metallic compound dissolved in an organic solvent,
• plural primary oxygen jetting orifices disposed circularly around a center of said raw material atomizing hole, for jetting oxygen or oxygen-enriched air parallel to a center line of said raw material atomizing hole, and
• plural secondary oxygen jetting orifices disposed circularly around a center of said raw material atomizing hole and outward from said primary oxygen jetting orifices, for jetting oxygen or oxygen-enriched air toward a point on a line extended from said raw material atomizing hole and parallel to said center line of said raw material atomizing hole.