Method for preparing high purity nano-scale bismuth oxide micro power and equipment thereof

Method for preparing high purity nano-scale bismuth oxide micro power and equipment thereof

  • CN 101,367,551 B
  • Filed: 09/29/2008
  • Issued: 12/01/2010
  • Est. Priority Date: 09/29/2008
  • Status: Active Grant
First Claim
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1. the production method of a high purity nano-level bismuth oxide micro-powder is characterized in that by following processing step production:

  • A, the smart bismuth of content 99.99% is added in the electric arc furnace (1) of band end negative electrode,,, under pressure 0.6-0.95 the atmospheric condition, make smart bismuth gasification produce the bismuth steam at temperature 3000-3500 ℃

    with the bismuth ingot heat fused;

    B, the bismuth steam is after negative pressure is sent into reactor (2) along high temperature conduit (6) suction, with send into the air that air suction inlet in the reactor (14) comes in and converge, high temperature bismuth steam is absorbed by the negative pressure oxidation and generates nano level solid oxide bismuth particle, simultaneously, after reactor (2) sucks freezing air, flue-gas temperature is reduced to 170 ℃

    , cool off through circulating water cooling device (16), the part than coarse particles bismuth oxide micro-powder productive set at reactor bottom, in the electric arc furnace (1) of negative electrode, the bismuth oxide micro-powder of productive set does not enter cyclone (3) with flue gas at the bottom of accumulated powder relief outlet (17) is discharged the band of sending step a back to;

    C, in cyclone (3), the flue gas of carrying bismuth oxide micro-powder secretly is through cyclone dust collection, particle diameter is collected at the bismuth oxide micro-powder of 2-10 μ

    m, through discharging, manually packs into product;

    D, through the ash-laden gas that the c step is discharged, gather dust through pulse bagroom (4) again, obtaining median size is the high purity nano-level bismuth oxide micro-powder product of 1 μ

    m, directly manually packs;

    Cloth bag tail gas is discharged into atmosphere via the aiutage (18) of negative pressure induced wind machine (5) afterbody.

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