Burner for producing inorganic spheroidized particles, device for producing inorganic spheroidized particles, and method for producing inorganic spheroidized particles

Abstract

The purpose of the present invention is to provide a burner for producing inorganic spheroidized particles, which is capable of efficiently melting an inorganic powder having a large particle size distribution and making the inorganic powder into a spherical shape. Provided is a burner (1) for producing inorganic spheroidized particles, comprising: a raw material powder supply path for supplying an inorganic powder as a raw material powder; a first fuel gas supply path (3A) for supplying a first fuel gas; and a first combustion-supporting gas supply path (4A) that supplies a first combustion-supporting gas. The raw material powder supply path has: a first supply path (2A) that extends in the axial direction of the burner (1); a first collision wall (2D) located at the tip of the first supply path (2A); a plurality of second supply paths (2B) branching from the tip of the first supply path (2A) and extending in the radial direction from the center of the combustor (1); one or more dispersion chambers (2C) located at the tip of the second supply path (2B) and having a wider space than the second supply path; and one or more raw material powder discharge holes (2a) communicating with the dispersion chamber (2C).

Description

technical field [0001] The present invention relates to a burner for producing spheroidized inorganic particles, an apparatus for producing spheroidized inorganic particles, and a method for producing spheroidized inorganic particles. Background technique [0002] Conventionally, methods for producing inorganic spheroidized particles (hereinafter, sometimes simply referred to as "spheroidized particles") by passing an inorganic powder raw material through a flame are known (Patent Documents 1 to 3). [0003] For example, in the inorganic spheroidized particle manufacturing apparatus disclosed in Patent Document 2, as Figure 12 As shown, the raw material powder is supplied from the raw material supply device (feeder) A, and is conveyed to the burner B together with the carrier gas supplied from the carrier gas supply device A'. Oxygen from the oxygen supply facility C and fuel gas (liquefied petroleum gas: LPG) from the LPG supply facility D are supplied to the burner B. Th...

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Problems solved by technology

On the contrary, if the injection speed of the carrier gas is increased, the residence time (heating time) in the burner flame cannot be sufficiently ensured, and sufficient heat cannot be given to melt particles with a large particle size.

[0015] In the conventional diffusion burners disclosed in the above-mentioned Patent Documents 1 to 3, the raw material powder is supplied to the burner flame together with the carrier gas from the vicinity of the center of the burner, and it is difficult to efficiently melt the following inorganic powder. And spheroidized, the inorganic powder has a large particle size distribution including particles (fine particles) with a particle size of about several μm to particles (coarse particles) with a particle size of tens of μm to hundreds of μm

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