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Process for production of low-specific-gravity hollow particles

A low specific gravity, hollow technology, applied in the field of preparation of low specific gravity hollow particles, can solve problems such as unstable production

Active Publication Date: 2010-03-24
IDEMITSU KOSAN CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in countries such as Australia, the United States, China, and Russia, cenospheres have been produced by this method and made into commercial products, but their production is unstable.
In addition, in Japan, where environmental restrictions are strict, it is difficult to adopt this production method, etc., and the industrial scale production of hollow microspheres has not been carried out in Japan in the past.

Method used

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  • Process for production of low-specific-gravity hollow particles
  • Process for production of low-specific-gravity hollow particles

Examples

Experimental program
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Effect test

Embodiment 1

[0038]Using 100 g of fly ash A as a raw material, it was sieved and classified into a first coarse particle component (a particle size of 45 μm or more) and a first fine particle component with a particle size of 45 μm using a vibrating screen type sieve classifier (manufactured by RESCH: Sieve shaker). Furthermore, the first fine particle component was similarly sieved and classified at a particle size of 20 μm, and classified into a second coarse particle component (particle size 20-45 μm) and a second fine particle component (particle size 20 μm or less). These particle components were weighed to obtain the recovery rate (% by weight) relative to the weight of the raw material, and the results shown in Table 1 were obtained.

[0039] [Table 1]

[0040]

[0041] Next, each particle component and water were mixed at a weight ratio of 1:9 and stirred to form a slurry. Then, after standing still for 4 hours, the low specific gravity components (hollow bead particles) floati...

Embodiment 2

[0048] 15 kg of fly ash B was used as a raw material and classified into a first coarse particle component (a particle size of 20 μm or more) and a first fine particle component with a particle size of 20 μm using a dry classifier (manufactured by Hosokahe Micron Co., Ltd.: Micron Separat MS-1H) (below 20μm). Furthermore, the first fine particle component was similarly classified with a particle size of 5 μm, and classified into a second coarse particle component (with a particle size of 5 to 20 μm) and a second fine particle component (with a particle size of 5 μm or less). These particle components were weighed to obtain the recovery rate (% by weight) relative to the weight of the raw material, and the results shown in Table 2 were obtained.

[0049] [Table 2]

[0050]

[0051] Next, the hollow microspheres were recovered in the same manner as in Example 1, after dehydration and drying, the dried hollow microspheres were weighed, and the yield of the hollow microspheres...

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PUM

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Abstract

Low-specific-gravity hollow particles having high added value can be efficiently mass-produced by using coal ash discharged from the coal firing step as the raw material, classifying the coal ash to collect low-specific-gravity hollow particles contained in the coal ash and to reduce the coal ash to be subjected to wet gravity separation, subjecting the reduced coal ash to wet gravity separation to recover a low-specific-gravity component, and dehydrating and drying the low-specific-gravity component.

Description

technical field [0001] The present invention relates to a low-specific-gravity hollow particle preparation method for effectively batch-producing high-value-added low-specific-gravity hollow particles using coal ash produced during pulverized coal combustion as a raw material. Background technique [0002] In coal-fired power plants, etc., coal ash generated when finely pulverized coal (powdered coal) is burned is one of the industrial wastes, and more than 80% of it has been recovered in the form of fly ash (fly ash) in Japan. use. [0003] Recycled fly ash is mainly used as a substitute for clay for cement preparation, and part of it is used as cement admixture, etc. In recent years, in order to study the effective use in fields other than cement raw materials, hollow particles with low specific gravity contained in fly ash Having attention. The above-mentioned hollow particles are called hollow microspheres (cenosphere: floating ash), which are spherical and hollow part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B5/00B03B5/28B03B7/00B03B9/06B07B1/00B07B9/00B09B3/00
CPCF23J2900/01001B03B9/04B09B5/00B03B5/28B07B1/00B07B9/00B09B3/00C04B18/08Y02W30/52Y02W30/20Y02W30/91
Inventor 安藤隆平岛刚野中壮泰大迫雄司
Owner IDEMITSU KOSAN CO LTD
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