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    • 18. 发明公开
    • Method of producing fine particles
    • Verfahren zur Herstellung vonfeinkörnigenPartikeln。
    • EP0298777A2
    • 1989-01-11
    • EP88306282.0
    • 1988-07-08
    • ALCAN INTERNATIONAL LIMITED
    • Askew, Herbert FrankBrown, Stephen Clifford
    • B02C23/12B02C21/00B02C23/36
    • B02C23/36B02C21/00B02C23/12
    • This invention relates to a method of reducing the particle size of solid particles and is applicable to the production of very fine particles of a wide variety of solids, includuing relatively hard solids.
      The method comprises milling a liquid suspension of solid particles in an agitated media mill (13), pumping the milled suspension through a particle size classification device (16) to separate the slurry into a coarse fraction (17) and a fine fraction (18), the particles of the coarse fraction having a greater median particle size than the particles of the fine fraction, recycling the coarse fraction (17) from the particle size classification device to the input of the mill (13), and recycling the fine fraction (18) by pumping (15) it to the classification device, wherein recycling of both coarse and fine fractions are continued until solid particles of the desired reduced particle size are produced.
      Preferably a single classification device and a single mill can be used, and particles having a median particle size of 0.3 microns or less and a relatively narrow particle size distribution can be produced, even using a hydrocyclone as the classification device.
    • 本发明涉及一种降低固体颗粒的粒度的方法,并且可用于生产各种固体的非常细小的颗粒,包括相对硬的固体。 该方法包括在搅拌介质研磨机(13)中研磨固体颗粒的液体悬浮液,将研磨的悬浮液泵送通过粒度分级装置(16)以将浆料分离成粗级分(17)和细级分(18) ,粗级分的颗粒具有比细级分颗粒更大的中值粒度,将粗级分(17)从粒度分级装置再循环到研磨机(13)的输入端,并将细分( 18)通过泵送(15)到分级装置,其中继续粗和细级分的再循环,直到产生所需的还原粒径的固体颗粒。 优选地,可以使用单一分级装置和单一研磨机,并且即使使用水力旋流器作为分级装置,也可以产生具有0.3微米或更小的中值粒径和相对窄的粒度分布的颗粒。
    • 19. 发明公开
    • Coal-water slurry producing system
    • 煤浆生产系统
    • EP0242218A3
    • 1988-07-13
    • EP87303371
    • 1987-04-15
    • BABCOCK-HITACHI KABUSHIKI KAISHA
    • Takamoto, ShigehitoMeguri, Nobuyasu
    • B02C23/36
    • B02C23/36B02C17/184
    • A coal-water slurry producing system comprises: a continuous wet-type ball mill (3) for grinding the coal with the addition of water and additives thereto to obtain coal-water slurry, supplying device (6, 7) for supplying the coal-water slurry discharged from the ball mill (3) to a filtering apparatus (8), the filtering apparatus (8) for filtering the supplied coal-water slurry to remove coal particles of a predetermined particle size or above, delivery device (14) for delivering the filtered coal-water slurry containing coal particles of the predetermined particle size or below to a slurry storage tank, a combustion apparatus, or the like. The coal-water slurry producing system further comprises a screen apparatus (19) disposed at an exit (5) of the ball mill (3) to remove coarse coal particles contained in the coal-water slurry, and recovery device (16, 18, 23, 24) for recovering the removed coarse coal particles at an entrance of the ball mill. The ball mill (3) is operated under the condition that the ratio (Us) of the slurry volume in the mill to the ball space volume in the mill ranges between 0.1 and 1.0.