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Process for preparing permanent magnetic ferrite in short process

A permanent magnet ferrite and short-process technology, which is applied in the direction of inorganic material magnetism, can solve the problems of lengthy process and low production efficiency, and achieve the effects of accurate ingredients, stable product performance, consistency and stability

Inactive Publication Date: 2021-11-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the existing process of preparing ferrite materials with high-purity magnetite concentrate (TFe>71.5%) is the rotary kiln process of chain paralysis machine, such as figure 1 As shown, the process includes many steps such as raw material drying and pre-oxidation, cooling, fine grinding, one-time weighing of ingredients, strong mixing, and pelletizing. The process is lengthy and the production efficiency is low.

Method used

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  • Process for preparing permanent magnetic ferrite in short process
  • Process for preparing permanent magnetic ferrite in short process
  • Process for preparing permanent magnetic ferrite in short process

Examples

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Embodiment 1

[0036] Embodiment 1 (this embodiment is to have carried out three groups of parallel tests, and sintering temperature is respectively 1155 ℃, 1160 ℃ and 1165 ℃):

[0037] A short flow process of the present invention prepares the technique of permanent magnet ferrite, and its flow chart is as figure 2 shown, including the following steps:

[0038] (1) the ultra-pure magnetite concentrate with a purity of 99.6%, a Si impurity content of 0.08%, an Al impurity content of 0.09%, a Fischer average particle size of 9 microns, and a water content of 9% is transported into the batching bin by a belt, The water content of the material is detected by the microwave on-line detection probe, and the analysis value of the water content of the material is fed back to the primary batching system in real time; referring to the real-time detection of the water content of the ultra-pure magnetite concentrate, according to the chemical formula SrO 5.85Fe 2 o 3 , adding strontium carbonate with...

Embodiment 2

[0046] Example 2 (in this example, three groups of parallel tests were carried out at the same time, and the highest temperatures of the second rotary kiln head were 1280°C, 1290°C and 1300°C respectively):

[0047] A short flow process of the present invention prepares the technique of permanent magnet ferrite, and its flow chart is as figure 2 shown, including the following steps:

[0048] (1) be 99.5% with purity, Si impurity content be 0.07%, Al impurity content be 0.08%, Fisherman's average particle diameter is 10 microns, and water content is that the ultra-pure magnetite concentrate of 8% is transported into batching bin by belt, The moisture content of the material is checked by the microwave on-line detection probe, and the analysis value of the moisture content of the material is fed back to the primary batching system in real time; referring to the real-time detection of the moisture content of the ultra-pure magnetite concentrate, according to the chemical formula...

Embodiment 3

[0057] A short flow process of the present invention prepares the technique of permanent magnet ferrite, and its flow chart is as figure 2 shown, including the following steps:

[0058] (1) The ultra-pure magnetite concentrate with a purity of 99.6%, Si impurities and Al impurities of 0.08%, a Fischer average particle size of 10 microns, and a water content of 10% is transported into the batching bin by a belt, and the material is passed through microwave On-line detection probe, the analysis value of material moisture content is fed back to the primary batching system in real time; refer to the moisture content detected in real time by ultra-pure magnetite concentrate, according to the chemical formula SrO nFe 2 o 3 , n=5.95, add strontium carbonate (purity 98%, average particle size 1.5 microns);

[0059] (2) Add water to the material after step (1) and carry out wet mixing and grinding. After wet mixing and grinding, the average particle size of the primary slurry is 3 m...

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Abstract

The invention relates to a process for preparing permanent magnetic ferrite in a short process. The process comprises the following steps: proportioning ultra-pure magnetite concentrate and strontium carbonate according to the molar ratio of SrO.nFe2O3 (n is more than 5.6 and less than 6.1), and then carrying out wet-process mixed grinding and water filtration; feeding the slurry subjected to water filtration into a first rotary kiln for drying, granulating and pre-oxidizing, and then feeding the slurry into a second rotary kiln for pre-sintering; and crushing the pre-sintered material, adding an additive to carry out secondary batching, and then carrying out wet-process mixed grinding, water filtering, magnetizing compression molding, sintering and grinding to obtain the permanent magnetic ferrite. In the preparation process of the permanent magnetic ferrite, a two-stage rotary kiln process is innovatively provided, drying, granulation and pre-oxidation of a pre-sintering material are carried out in the first rotary kiln, and a pre-sintering reaction is completed in the second rotary kiln, so that the oxidation of the ultra-pure magnetite concentrate is closely linked with the solid-phase sintering reaction process of iron strontium oxide, the links of drying, cooling, pelletizing, strong mixing and chain numbness machine pre-oxidation in the prior art are omitted, and the production is more efficient and smoother.

Description

technical field [0001] The invention belongs to the field of preparation of permanent magnet ferrite materials, and in particular relates to a short-flow process for preparing permanent magnet ferrite. Background technique [0002] As an important part of magnetic materials, permanent magnet materials play an important role in electronics industry, information industry, motorcycle, electric tool industry, automobile industry and other industries. Permanent ferrite materials have the advantages of high comprehensive cost performance and convenient use, and are widely used in automobile motors, speakers, earphones and various instruments. A DC motor with the same power can reduce energy consumption by 30-50% compared with an AC motor. Under the support and guidance of national policies, DC motors will surely replace high-energy-consuming AC motors on a large scale. Permanent magnet ferrite tiles are essential for DC motors, which brings new opportunities for the development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622H01F1/10
CPCC04B35/2683C04B35/622H01F1/10C04B2235/3208C04B2235/3217C04B2235/3409C04B2235/3418C04B2235/6567C04B2235/602C04B2235/661
Inventor 徐斌姜涛周玉娟杨永斌李骞钟寿国陈羽峰吴金甜李光辉郭宇峰范晓慧黄柱成张元波彭志伟甘敏易凌云杨凌志
Owner CENT SOUTH UNIV
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