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Preparation method of high-purity hexagonal sheet barium ferrite

A technology of hexagonal flakes and barium ferrite, applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of reducing the utilization rate of raw materials, environmental pollution, etc., and achieve improved utilization rate, uniform heating, and saving raw materials Effect

Active Publication Date: 2018-10-12
青岛锐象新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Literature (Long Chunquan. Co-precipitation method to prepare barium ferrite [J]. Process Engineering Journal, 2004, 4 (5): 434-437) using ammonia and Na 2 CO 3 As a precipitant, the resulting precursor contains BaCO 3 CO is produced during calcination 2 gas, which reduces the utilization rate of raw materials; literature (Cao Changsheng, chemical co-precipitation method to prepare M-type barium ferrite research [J]. Journal of Shenyang University of Technology, 2010, 29 (1): 71-75.) reported that the Fe(NO 3 ) 3 9H 2 O is used as a method for experimental raw materials, but nitric acid raw materials have certain dangers and are likely to cause environmental pollution

Method used

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  • Preparation method of high-purity hexagonal sheet barium ferrite
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  • Preparation method of high-purity hexagonal sheet barium ferrite

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Embodiment 1

[0035] This embodiment provides a preparation process for preparing high-purity hexagonal flake barium ferrite by a chemical co-precipitation method, and the preparation steps are as follows:

[0036] (1) Prepare BaCl with a concentration of 0.5mol / L 2 Solution and 1mol / L FeCl 3 The solution is mixed with a barium-iron stoichiometric ratio of 1:10 and stirred evenly; the stirring speed is 600 rpm;

[0037] (2) Prepare a NaOH solution with a concentration of 6mol / L, and instill BaCl through a basic burette at a titration rate of 1 drop per second 2 And FeCl 3 In the mixture, BaCl 2 The stoichiometric ratio to the added NaOH is 1:38;

[0038] (3) During the dropping process, use a magnetic stirrer to continuously stir to make the reaction uniform, and let it stand for 10 minutes after the reaction is completed; the stirring speed is 600 rpm;

[0039] (4) The precursor obtained by the reaction after mixing is suction filtered, dried, and then heated to 1000°C at a heating rate of 5°C / min ...

Embodiment 2

[0046] This embodiment provides a preparation process for preparing high-purity hexagonal flake barium ferrite by a chemical co-precipitation method, and the preparation steps are as follows:

[0047] (1) Prepare BaCl with a concentration of 0.5mol / L 2 Solution and 1mol / L FeCl 3 The solution is mixed with a barium-iron stoichiometric ratio of 1:9 and stirred evenly; the stirring speed is 600 rpm;

[0048] (2) Prepare a NaOH solution with a concentration of 6mol / L, and instill BaCl through a basic burette at a titration rate of 1 drop per second 2 And FeCl 3 In the mixture, BaCl 2 The stoichiometric ratio to the added NaOH is 1:38;

[0049] (3) During the dropping process, use a magnetic stirrer to continuously stir to make the reaction uniform, and let it stand for 10 minutes after the reaction is completed; the stirring speed is 600 rpm;

[0050] (4) The precursor obtained by the reaction after mixing is suction filtered, dried, and then heated to 800°C at a heating rate of 5°C / min fo...

Embodiment 3

[0053] This embodiment provides a preparation process for preparing high-purity hexagonal flake barium ferrite by a chemical co-precipitation method, and the preparation steps are as follows:

[0054] (1) Prepare BaCl with a concentration of 0.5mol / L 2 Solution and 1mol / L FeCl 3 The solution is mixed with a barium-iron stoichiometric ratio of 1:11 and stirred evenly; the stirring speed is 600 rpm;

[0055] (2) Prepare a NaOH solution with a concentration of 6mol / L, and instill BaCl through a basic burette at a titration rate of 1 drop per second 2 And FeCl 3 In the mixture, BaCl 2 The stoichiometric ratio to the added NaOH is 1:38;

[0056] (3) During the dropping process, use a magnetic stirrer to continuously stir to make the reaction uniform, and let it stand for 10 minutes after the reaction is completed; the stirring speed is 600 rpm;

[0057] (4) The precursor obtained by the reaction after mixing is suction filtered, dried, and then heated to 800°C at a heating rate of 5°C / min f...

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Abstract

The invention discloses a preparation method of a high-purity hexagonal sheet barium ferrite. A precipitator NaOH solution is added into a solution containing BaCl2 and FeCl3,and a generated precursoris subjected to suction filtration drying and then is roasted at high temperature. By changing the experiment parameters such as stoichiometric proportion,roasting temperature,roasting time and rising speed of reaction raw materials,the high-purity hexagonal sheet barium ferrite is finally generated. The preparation method is simple,a preparation period is short,raw materials containing nitrate are not used in the preparation process,and the preparation method is friendly to the environment and safe. The prepared barium ferrite is in a shape of a hexagonal sheet,is high in purity and has a wide application prospect in multiple fields by serving as a magnetic material,a wave-absorbing material and the like.

Description

Technical field [0001] The invention relates to a method for preparing barium ferrite, in particular to a method for preparing high-purity hexagonal flake barium ferrite by a chemical co-precipitation method, and belongs to the field of material preparation. Background technique [0002] Barium ferrite has good magnetic properties, wave absorbing effect, higher Curie temperature and dielectric constant and other characteristics, and is a promising functional material. Hexagonal flake barium ferrite has hexagonal symmetry. Because of its large coercivity and magnetic energy product, uniaxial magnetocrystalline anisotropy, and excellent gyromagnetic characteristics, it is widely used in permanent magnets, wave absorption, In various fields such as high-density perpendicular magnetic recording and microwave and millimeter wave devices. Therefore, the preparation and application of hexagonal flake barium ferrite has become one of the important research topics in the field of materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
CPCC01G49/0036C01P2002/72C01P2004/03C01P2004/22C01P2006/42C01P2006/80
Inventor 张建峰卜凡张维维王笑影杨笑言
Owner 青岛锐象新材料科技有限公司
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