Spray atomization process used in process of preparing metal powder by water atomization

Abstract

The invention discloses a spray atomization process used in the process of preparing metal powder by water atomization. The spray atomization process comprises primary atomization and secondary atomization, i.e. a spray nozzle is added below a spray nozzle for primary atomization to carry out secondary cold water atomization, a spray nozzle for secondary atomization is positioned below the spray nozzle for primary atomization at a distance of 0.5-2 cm and the cold water temperature of the spray nozzle for secondary atomization is 5-8 DEG C, wherein in the atomizing process, the aperture of a tundish is 5-8 mm, a spray vertex angle of primary atomization is 50-55 degrees, a spray vertex angle of secondary atomization is 40-45 degrees, the atomization pressure is 18-25 Mpa, the height of an atomization bucket is 3 m and the cooling water level is 0.2-0.4 m. According to the spray atomization process used in the process of preparing metal powder by water atomization, secondary atomization is added, parameters such as the spray vertex angles, the hole diameter of the tundish, the atomization pressure and cooling water level are comprehensively regulated, the degree of sphericity and the apparent density of the metal powder are effectively improved, granularity of the powder is finer and the high industry requirement on morphology can be met.

Description

technical field [0001] The invention relates to the technical field of metal powder production, in particular to a spray atomization process in the process of water atomization to prepare metal powder. Background technique [0002] The atomization method produces metal powder with low cost, high efficiency, and little environmental pollution. The atomization method includes aerosol method and water mist method. Among them, the preparation of metal powder by water mist method needs to go through technological processes such as metal melting, spray atomization, and screening. At present, in the spray atomization process of metal powder prepared by water mist method, the spray angle formed between the atomization medium and the metal liquid flow is different. Reasonable, the atomization pressure is unreasonable, it cannot guarantee that the atomization medium has a large energy, and it cannot make the metal liquid flow produce the smallest flocculation, so that the metal powder...

AI Technical Summary

Problems solved by technology

Among them, the preparation of metal powder by water mist method needs to go through technological processes such as metal melting, spray atomization, and screening. At present, in the spray atomization process of metal powder prepared by water mist method, the spray angle formed between the atomization medium and the metal liquid flow is different. Reasonable, the atomization pressure is unreasonable, it cannot guarantee that the atomization medium has a large energy, and it cannot make the metal liquid flow produce the smallest flocculation, so that the metal powder produced has a lower bulk density, a coarser particle size, and a higher output. The microscopic morphology of the metal powder is irregular, which cannot meet the needs of the industry with high requirements on the shape, and the working stability is poor, the nozzle is easy to block, and the service life of the nozzle is low

In addition, during the atomization process, the height of the atomization barrel is selected to be high, the water level setting is unreasonable, and the water level is too low, which often causes the atomized metal particles to easily hit the wall of the barrel, collide flat, change the sphericity of the metal particles, and the water level is too high , the moisture is difficult to vaporize for a while, and an effective gas protection cannot be formed in the barrel