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High saturation and magnetic intensity magnetic powder and its preparing method and use

A technology of magnetization and magnetic powder, which is applied in the direction of magnetism of inorganic materials, oxides of ferrous iron, iron oxide/iron hydroxide, etc., can solve problems such as difficulties in nanoparticles, and achieve good dispersion, high saturation magnetization, and correction The effect of high tenacity

Inactive Publication Date: 2007-08-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through appropriate reaction conditions, ferric oxide nanocrystals with a few to tens of nanometers can now be prepared, but it is still difficult to prepare nanoparticles with excellent dispersion properties, usually by coating the surface of ferric oxide Silicon dioxide to prepare ferroferric oxide magnetic powder with good dispersion and no agglomeration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Add the mixed solution of sodium hydroxide, ammonium bicarbonate and ammoniacal liquor into the ferrous sulfate solution, stir evenly, and adjust the pH value in the range of 12 to 14;

[0021] Wherein the concentration of ferrous sulfate solution is 0.8mol / L; The concentration of sodium hydroxide solution is 22%; The concentration of ammonium bicarbonate solution is 26%; The concentration of ammoniacal liquor is 31%; Sodium hydroxide: ammonium bicarbonate: the mass ratio of ammoniacal liquor is 1: 1: 1; the mixed solution of ferrous sulfate, sodium hydroxide, ammonium bicarbonate and ammonia water is mixed in a ratio of 1: 25 (mass ratio);

[0022] (2) Nitrogen is passed into the mixed solution of step (1), the temperature is raised to 65° C., and the temperature is kept for 20 minutes;

[0023] (3) After heat preservation, the temperature of the mixed solution in step (2) was raised to 82° C., the nitrogen gas was switched to the air, and the heat preservation rea...

Embodiment 2

[0029] (1) Add the mixed solution of sodium hydroxide, ammonium bicarbonate and ammoniacal liquor into the ferrous sulfate solution, stir evenly, and adjust the pH value in the range of 12 to 14;

[0030] Wherein the concentration of ferrous sulfate solution is 0.6mol / L; The concentration of sodium hydroxide solution is 25%; The concentration of ammonium bicarbonate solution is 30%; The concentration of ammoniacal liquor is 35%; Sodium hydroxide: ammonium bicarbonate: the mass ratio of ammoniacal liquor is 1.5:1.2:2; the mixed solution of ferrous sulfate, sodium hydroxide, ammonium bicarbonate and ammonia water is mixed in a ratio of 1:50 (mass ratio)

[0031] (2) Nitrogen is passed into the mixed solution of step (1), the temperature is raised to 85° C., and the temperature is kept for 30 minutes;

[0032] (3) After the heat preservation, the temperature of the mixed solution in step (2) was raised to 90° C., the nitrogen gas was switched to the air, and the heat preservation...

Embodiment 3

[0038] (1) Add the mixed solution of sodium hydroxide, ammonium bicarbonate and ammoniacal liquor into the ferrous sulfate solution, stir evenly, and adjust the pH value in the range of 12 to 14;

[0039] Wherein the concentration of ferrous sulfate solution is 1.0mol / L; The concentration of sodium hydroxide solution is 28%; The concentration of ammonium bicarbonate solution is 33%; The concentration of ammoniacal liquor is 30%; Sodium hydroxide: ammonium bicarbonate: the mass ratio of ammoniacal liquor is 3:1.5:2; the mixed solution of ferrous sulfate, sodium hydroxide, ammonium bicarbonate and ammonia water is mixed in a ratio of 1:75 (mass ratio)

[0040] (2) Nitrogen is passed into the mixed solution of step (1), the temperature is raised to 90° C., and the temperature is kept for 30 minutes;

[0041] (3) After heat preservation, the temperature of the mixed solution in step (2) was raised to 100° C., the nitrogen gas was switched to ventilate the air, and the heat preserv...

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Abstract

The invention belongs to field of magnetic powdery material, specially the highly saturation intensity ferriferrous oxide magnetic powder and its producing method and usage. The invention adopts polymorphic inversion single stage method to produce ferriferrous oxide magnetic powder which possesses perfect dispersity, magnetic saturation intensity is above 85emu / g, particle diameter is 0.15-0.4 mum, coercitive force is smaller than 35Oe, surface area is 5-8m2 / g. The ferriferrous oxide produced is oxygenized or deacidized further to produce gamma-di-iron trioxide and alpha-Fe magnetic powder which possesses perfect dispersity, coercitive force is big, saturation intensity is high. The magnetic powder can be used widely in fields of digit copy powder, magnetic recording material and medical magnetic powder.

Description

technical field [0001] The invention belongs to the field of magnetic powder materials, in particular to ferric oxide magnetic powder with high saturation magnetization and its preparation method and application. Background technique [0002] In recent years, due to the broad prospects of magnetic nanoparticles in practical applications, research on the preparation methods and properties of magnetic nanoparticles has attracted much attention. In terms of magnetic recording materials, magnetic nanoparticles are expected to replace traditional submicron magnetic powders for high-density magnetic recording materials; in the biological field, magnetic powders made of magnetic nanomaterials can be widely used in the separation and Magnetic resonance imaging, etc. Among the various types of magnetic nanoparticles that have been reported, the Fe 3 o 4 The preparation method and application of nanoparticles have been paid special attention. Through appropriate reaction condition...

Claims

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Application Information

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IPC IPC(8): H01F1/11H01F1/36C01G49/08
Inventor 宋宝珍甘耀焜唐清李巧霞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI