Method for preparing permanent magnet strontium ferrite by utilizing iron oxide red

A technology of iron oxide red and strontium ferrite, which is applied in the field of comprehensive resource utilization and material synthesis, can solve the problems of high production temperature and achieve the effects of uniform composition, low temperature and strong operability

Inactive Publication Date: 2016-03-30
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the invention provides a method for preparing permanent magnet strontium ferrite (SrFe 12 o 19 ) method, the purpose of which is to solve the problem of high production temperature of existing strontium ferrite, to realize the synthesis of strontium ferrite with uniform composition and uniform particle size through molten salt synthesis method, and to realize the value-added utilization of iron oxide red

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  • Method for preparing permanent magnet strontium ferrite by utilizing iron oxide red
  • Method for preparing permanent magnet strontium ferrite by utilizing iron oxide red
  • Method for preparing permanent magnet strontium ferrite by utilizing iron oxide red

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Embodiment 1

[0027] The method for preparing permanent magnet strontium ferrite by using red iron oxide comprises the following steps:

[0028] Step 1: After the iron oxide red and strontium carbonate obtained by rolling steel scale are mixed according to the molar ratio in Table 1, ball milling is carried out with a planetary ball mill. The rotating speed is 250r / min, and the particle size of the obtained material is ≤500nm;

[0029] Step 2: The ball-milled material and NaCl-KCl eutectic salt are mixed uniformly at a mass ratio of 1:1, put into a corundum crucible, and calcined at 1100°C for 2 hours in a muffle furnace;

[0030] Step 3: Wash and filter the reacted material with deionized water at 80°C to 120°C until all the molten salts are washed away, and then dry the obtained product in a vacuum drying oven at 80°C for 10 hours to obtain permanent magnet strontium ferrite.

[0031] The magnetic properties index of the permanent magnet strontium ferrite prepared by the present embodim...

Embodiment 2

[0037] The method for preparing permanent magnet strontium ferrite by using red iron oxide comprises the following steps:

[0038] Step 1: Red iron oxide and strontium carbonate obtained by rolling steel scale are mixed according to the molar ratio of 5.3:1. After batching, the planetary ball mill is used for ball milling. The mass ratio of ball to material is 9:1, and the ball milling time is 5 hours. The rotating speed is 300r / min, and the particle size of the obtained material is ≤500nm;

[0039] Step 2: The ball-milled material and NaCl-KCl molten salt are mixed evenly in a mass ratio of 1:1, put into a corundum crucible, and calcined at the temperature in Table 2 for 2 hours in a muffle furnace;

[0040] Step 3: wash and filter the reacted material with 80°C deionized water until all the molten salts are washed away, and then dry the material in a vacuum drying oven at 80°C for 16 hours to obtain permanent magnet strontium ferrite.

[0041] The magnetic properties of the s...

Embodiment 3

[0046] The method for preparing permanent magnet strontium ferrite by using red iron oxide comprises the following steps:

[0047] Step 1: The red iron oxide and strontium carbonate obtained by rolling steel scale are mixed according to the molar ratio of 5.3:1. After batching, the planetary ball mill is used for ball milling. The mass ratio of ball to material is 12:1. The rotating speed is 200r / min, and the particle size of the obtained material is ≤500nm;

[0048] Step 2: The ball-milled material and the molten salt in Table 3 are mixed evenly at a mass ratio of 10:1, put into a corundum crucible, and calcined at a temperature of 1100° C. for 2 hours in a muffle furnace;

[0049] Step 3: wash and filter the reacted material with deionized water at 100°C until all the molten salts are washed away, and then dry the material in a vacuum oven at 100°C for 8 hours to obtain permanent magnet strontium ferrite.

[0050] The magnetic properties of the permanent magnet strontium fe...

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Abstract

The invention relates to a method for preparing a permanent magnet strontium ferrite by utilizing iron oxide red and belongs to the fields of comprehensive utilization of resources and material synthesis. The method for preparing the permanent magnet strontium ferrite by utilizing the iron oxide red comprises the following steps: (1) mixing the iron oxide red obtained by rolling steel scale and strontium carbonate, and then carrying out ball milling; (2) mixing the material obtained through the ball milling with fused salt, and then calcining; and (3) cleaning the materials obtained after reaction, and drying, so that the permanent magnet strontium ferrite product is obtained. The method for preparing the permanent magnet strontium ferrite by utilizing the iron oxide red has the advantages that the synthetic permanent magnet strontium ferrite is small in granularity and uniform in composition, large-scale production can be realized, and the fused salt can be recycled; value-added exploration of a secondary resource, namely the iron oxide red obtained by rolling the steel scale, is realized, and the energy is saved; the prepared permanent magnet strontium ferrite is uniform in granularity distribution, and the grain size is 0.5-3mu m; and the coercive force value is 2687-4043Oe, the residual magnetism is 32.92-35.37emu/g, the saturated magnetic intensity is 59.57-62.29emu/g, and the maximum magnetic energy product is 0.42-0.61MG.Oe.

Description

technical field [0001] The invention belongs to the field of resource comprehensive utilization and material synthesis, in particular to a permanent magnet strontium ferrite (SrFe 12 o 19 )Methods. Background technique [0002] M-type ferrite is a compound with a hexagonal structure with uniaxial anisotropy. Since this type of ferrite material can retain a strong constant remanence for a long time after the external magnetization field disappears, it is called called permanent ferrite. It is widely used in the fields of microwave absorption, electronic devices, magnetic recorders, bioactive glass ceramics, magnetic substrates, and magnetic catalysts. Since strontium ferrite (SrFe 12 o 19 ) has a suitable Curie temperature, high coercive force, large saturation magnetization, good chemical stability and corrosion resistance, and has attracted the attention and attention of many scholars. The main iron-containing raw material for the synthesis of strontium ferrite is Fe ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
CPCC01G49/0027C01P2002/72C01P2004/03C01P2004/61C01P2004/62C01P2006/42
Inventor 薛向欣刘建兴杨合姜涛程功金何占伟李万礼岳宏瑞
Owner NORTHEASTERN UNIV
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