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Method for classifying powder

A classification method and fluid classification technology, applied in solid separation, chemical instruments and methods, separating solids from solids with air flow, etc., can solve the problems of reduced classification performance, blockage of high-pressure gas ejection outlets, difficulty in long-term operation, etc. , to achieve the effect of efficient classification

Active Publication Date: 2011-09-21
NISSHIN SEIFUN GRP INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such fine powder can be obtained by centrifuging and classifying the powder as the raw material. However, in the existing classification method, since the raw material powder adheres to each part in the classifier, the raw material inlet or high-pressure gas The clogging of the ejection port may lead to a decrease in classification performance, making it difficult to operate for a long time

Method used

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  • Method for classifying powder
  • Method for classifying powder
  • Method for classifying powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] In Example 1, the air intake of the suction blower is set to 1.0 m by using a classifier equipped with a heat insulating device. 3 / min, so that the pressure of the high-pressure gas generated by the blower is 0.8MPa. Also, in this experiment, as the powder to be classified, nickel powder composed of fine powder with a median diameter (median diameter) of 0.4 μm, and barium titanate fine powder at a mass ratio of 0.25 to 3.7% were used. Ethanol is mixed as an auxiliary agent to obtain a mixed powder. In addition, the amount of powder charged into the classifier was set at 200 g / hour. And, the temperature in the classifier was set to 110°C. Table 2 shows the relationship between the ethanol adsorption amount (mass ratio) of the mixed powder and the micropowder recovery rate.

[0054] [Table 2]

[0055]

[0056] As shown in Table 2, when the nickel powder having adsorbed ethanol as an auxiliary agent is classified, the fine powder recovery rate is improved compared t...

Embodiment 2

[0059] In Example 2, the suction capacity of the suction blower is set to 1.0 m by using a classifier equipped with a heat insulating device. 3 / min, so that the pressure of the high-pressure gas generated by the blower is 0.8MPa. In addition, in this experiment, as the powder to be classified, nickel powder composed of fine powder having a median diameter (median diameter) of 0.7 μm was immersed in ethanol as an auxiliary agent. After several hours, the ethanol is vaporized and dried to obtain a nickel powder with an ethanol adsorption amount of 0.09-0.7% by mass. In addition, the amount of powder charged into the classifier was set to 200 g / hour, and the temperature in the classifier was set to 110°C. Table 3 shows the relationship between the ethanol adsorption amount (mass ratio) of the mixed powder and the micropowder recovery rate.

[0060] [table 3]

[0061]

[0062] As shown in Table 3, when the nickel powder was classified after being soaked in ethanol as an aux...

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Abstract

A method for classifying a powder using a fluid classifier, comprises a mixing step (step S10) of mixing a powder and an assistant agent composed of an alcohol, an input step (step S22) of inputting the powder mixed in the mixing step into the fluid classifier, a heating step (step S14) of heating a gas, a supply step (step S16) of supplying the gas heated in the heating step into the fluid classifier, and a classification step (step S24) of classifying the powder according to particle diameters in the fluid classifier.

Description

technical field [0001] The present invention relates to a powder classification method capable of efficiently classifying a powder having a particle size distribution to a desired classification point (particle diameter). Background technique [0002] There is known a classification method in which a fluid auxiliary agent such as alcohol (alcohol) is added in advance when classifying powder such as glassy blast furnace slag into fine powder and coarse powder (for example, refer to Patent Document 1). In this classification method, by adding an auxiliary agent containing polar molecules to the powder, the polarity of the powder particles is electrically neutralized, thereby preventing the particles from adsorbing each other and agglomerating to form agglomerated particles with a larger particle diameter, preventing classification Reduced efficiency. [0003] Patent Document 1: (Japanese) Unexamined Patent Publication No. 64-85149 [0004] However, ceramics currently used as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07B7/08B03B1/04B07B11/02B22F1/00B22F1/102
CPCB07B7/086B07B11/02B22F1/0062B07B4/00B22F1/102B22F1/00B07B7/08B03B1/04
Inventor 小泽和三秋山聪安藤康辅
Owner NISSHIN SEIFUN GRP INC
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