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Preparation method of high quality magnetic material Mn3O4 ultrafine powder

A magnetic material and ultrafine powder technology, applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of difficult control of particle size and particle size distribution, complex process and equipment, high reaction temperature and energy consumption, and achieve easy large-scale industry The effect of chemical production, excellent magnetic and catalytic properties, reaction temperature and low energy consumption

Inactive Publication Date: 2006-09-13
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Before the present invention, Mn 3 o 4 There are two main industrial production methods of powder: one is to calcinate various manganese hydroxides, nitrates, carbonates and sulfates at a high temperature of about 1000°C to obtain Mn 3 o 4 Powder, the disadvantage of this method is that the required reaction temperature and energy consumption are high, and the obtained Mn 3 o 4 Coarse powder particles, wide particle size distribution, severe agglomeration, small specific surface area, and poor fluidity lead to poor product quality and performance; the second is the metal Mn method, also known as electrolytic metal manganese powder suspension oxidation method or electrolytic metal manganese corrosion method. Using electrolytic manganese metal flakes as raw material, first crush the metal manganese flakes to make a suspension, use air or oxygen as an oxidant, and prepare manganese tetraoxide at a certain temperature and additive concentration (the process route is as follows: electrolysis Metal manganese flakes—milling—oxidation—washing—drying—finished product), its disadvantage is that this method adopts more expensive metal Mn as raw material, requires additives, complicated process and equipment, high reaction temperature and energy consumption, long time consumption, Production costs are high and product particle size and particle size distribution are difficult to control

Method used

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  • Preparation method of high quality magnetic material Mn3O4 ultrafine powder
  • Preparation method of high quality magnetic material Mn3O4 ultrafine powder
  • Preparation method of high quality magnetic material Mn3O4 ultrafine powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 1.58g KMnO 4 The powder is dissolved in 0.15mol / L NaOH aqueous solution, then add 1.5mL cyclohexanone (keep the volume sum of NaOH aqueous solution and cyclohexanone 40mL), stir; then put it into a 50mL airtight autoclave, Hydrothermal reaction was carried out at 150°C and autogenous pressure for 24 hours; after it was naturally cooled to room temperature, the solid product was filtered with suction and washed with distilled water; dried to obtain the product Mn 3 o 4 Ultrafine powder.

[0021] Explanation of test results:

[0022] Such as figure 1 Shown: the X-ray diffraction pattern of the product produced in Example 1 of the present invention (using Bruker D8 Advance X-ray powder diffractometer (Cu Kα radiation, λ=1.5406 Å) to determine the crystal structure of the prepared material). All its X-ray diffraction peaks from left to right correspond to the tetragonal Mn 3 o 4 (101), (112), (200), (103), (211), (202), (220), (204), (105), (312), (303), (321), (...

Embodiment 2

[0025] Take 1.58g KMnO 4 Dissolve the powder in 1.0mol / L NaOH aqueous solution, then add 1.5mL cyclohexanone (keep the volume sum of NaOH aqueous solution and cyclohexanone 40mL), stir; then put it into a 50mL airtight autoclave, Hydrothermal reaction was carried out at 150°C and autogenous pressure for 24 hours; after it was naturally cooled to room temperature, the solid product was filtered with suction and washed with distilled water; dried to obtain the product Mn 3 o 4 Ultrafine powder.

[0026] Explanation of test results:

[0027] Such as image 3 Shown: the X-ray diffractogram of the product made in embodiment 2 of the present invention (instrument is the same as embodiment 1). All its X-ray diffraction peaks from left to right correspond to the tetragonal Mn 3 o 4 (101), (112), (200), (103), (211), (202), (220), (204), (105), (312), (303), (321), ( 224), (400), (206), (305), (413), (412), (404) crystal faces, illustrating that the product produced in Example 2...

Embodiment 3

[0030] Take 1.58g KMnO 4 Dissolve the powder in 0.30mol / L NaOH aqueous solution, then add 1.5mL cyclohexanone (to keep the volume of NaOH aqueous solution and cyclohexanone as 40mL), stir; ℃ and its own pressure for 10 hours of hydrothermal reaction; after it was naturally cooled to room temperature, the solid product was filtered with suction and washed with distilled water; dried to obtain the required Mn 3 o 4 Ultrafine powder.

[0031] Explanation of test results:

[0032] Such as Figure 5 Shown: the X-ray diffraction figure of the product of the embodiment of the present invention 3 (instrument is the same as embodiment 1). All its X-ray diffraction peaks from left to right correspond to the tetragonal Mn 3 o 4 (101), (112), (200), (103), (211), (202), (220), (204), (105), (312), (303), (321), ( 224), (400), (206), (305), (413), (412), (404) crystal faces, illustrating that the product prepared in Example 3 is pure tetragonal phase Mn with good crystallinity 3 o ...

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Abstract

A superfine Mn3O4 powder as the high-quality magnetic material with large specific surface area, controlled granularity and high magnetic and catalytic performance is prepared through dissolving the potassium permanganate in the aqueous solution of sodium hydroxide, adding cyclohexanone, stirring, hydrothermal reaction, natural cooling, pump-filtering, washing with distilled water and drying.

Description

technical field [0001] The invention relates to a magnetic material, in particular to a high-quality magnetic material Mn 3 o 4 Preparation method of ultrafine powder. Background technique [0002] mn 3 o 4 The powder and the manganese zinc ferrite soft magnetic material prepared from it have been widely used in the electronics and information industries, and can be used to manufacture magnetic cores for storing information in electronic computers, transformers for telephones and high-quality Inductors, TV flyback transformers, magnetic heads for magnetic recording, alternators, electromagnets, inductors, magnetic amplifiers, saturated inductors, antenna rods, air defense missile systems in radar technology, communication systems, satellite reception technology, high frequency or Damping elements or shielding materials for radio frequency circuits, etc. In addition, Mn 3 o 4 The ultrafine powder itself can also be used as an efficient catalyst for reducing nitrogen ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
Inventor 张永才唐井元张明郭荣
Owner YANGZHOU UNIV
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