Method for preparing spherical Fe3O4 nano powder

Method for preparing spherical Fe3O4 nano powder

CN
  • CN 101,381,109 A
  • Filed: 10/24/2008
  • Published: 03/11/2009
  • Est. Priority Date: 10/24/2008
  • Status: Active Application
First Claim
Patent Images

1. spherical Fe 3O 4The preparation method of nano-powder is characterized in that being made up of following step:

  • (1) compound concentration is 0.1molL -1-1.0molL -1The aqueous solution of ferrous salt;

    , stir to 70-95 ℃

    at the 0.5-1.5h internal heating, rotating speed is 100~

    1000 rev/mins, adds ammoniacal liquor, and adjusting pH is 4.0-8.0;

    (2) solution that step (1) is made is put into the reactor that gas distributor is housed, and stirs, and rotating speed is 100~

    1000 rev/mins, at 70~

    95 ℃

    , and bubbling air, air flow quantity is 0.1~

    2.0m 3/ h added NH after bubbling air 5-15 minute 4NO 2Or NaNO 2Be catalyzer, the add-on of catalyzer is the 0.1%-1.0% of ferrous salt quality, reacts Fe in the detection architecture 3+With Fe 2+Mol ratio when being 1.6-2.6, stop blowing air;

    (3) continue to stir, rotating speed is 100~

    1000 rev/mins, at 70~

    95 ℃

    , and after adding ammoniacal liquor adjusting pH value is 8.0-14.0, insulation reaction 1.0-5.0h;

    (4) stop to stir and heating, naturally cool to 20~

    35 ℃

    ;

    (5) solid-liquid separation, isolated solid is used deionized water wash 2-5 time;

    At 40-150 ℃

    , drying makes a kind of spherical Fe 3O 4Nano-powder.

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