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Process for preparing permanent magnetic ferrite through two-stage ball milling and mixture

A permanent ferrite and preparation technology, applied in the field of magnetic materials, can solve the problems of easy cracking of pores and products, strontium running, etc., and achieve the effect of not easy to precipitate, slow layering, and small molecular weight

Inactive Publication Date: 2017-05-24
JINTAN MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the present invention: to provide a permanent magnet ferrite secondary ball milling mixture preparation process to effectively solve the problems of strontium running out in the production process of permanent magnet ferrite products, pores formed in the sintering process, and easy cracking of products the above problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] ① Add ferrite pre-fired material, steel balls and water into the ball mill according to the mass ratio of 1:4:1.5, turn on the ball mill, set its speed to 29r / min, and mix for 15 minutes;

[0018] ②Add boric acid with 0.2% mass of pre-fired ferrite to the above mixture in summer, then add ammonium bicarbonate with 2.0% mass of pre-fired ferrite, set the speed at 29r / min, and mix for 30min;

[0019] ③Start ball milling, set the speed of the ball mill to 29r / min, continuously shower the outside with a large amount of water, measure the temperature of the internal mixture at 50-55°C, and the ball milling time is 15h;

[0020] ④ After the ball milling is finished, the material is discharged, and the ball mill is placed in the sedimentation tower for natural precipitation for 72 hours;

[0021] ⑤Remove the water in the upper layer of the mixed material after precipitation, and then take out the material while stirring under the stirring condition of 180r / min.

Embodiment 2

[0023] ① Add ferrite pre-fired material, steel balls and water into the ball mill according to the mass ratio of 2:4:2.5, turn on the ball mill, set its speed to 29r / min, and mix for 15 minutes;

[0024] ②Add boric acid with 0.1% mass of ferrite pre-sintered material to the above mixture in spring, then add ammonium bicarbonate with 0.7% mass of ferrite pre-sintered material, set the speed at 29r / min, and mix for 30 minutes;

[0025] ③Start ball milling, set the speed of the ball mill to 29r / min, continuously shower the outside with a large amount of water, measure the temperature of the internal mixture to be 45-50°C, and the ball milling time to be 16h;

[0026] ④ After the ball milling is finished, the material is discharged, and the ball mill is placed in the sedimentation tower for natural precipitation for 72 hours;

[0027] ⑤Remove the water in the upper layer of the mixed material after precipitation, and then take out the material while stirring under the stirring con...

Embodiment 3

[0029] ① Add ferrite pre-fired material, steel balls and water into the ball mill according to the mass ratio of 1:5:2.5, turn on the ball mill, set its speed to 29r / min, and mix for 15 minutes;

[0030] ②Add boric acid with 0.1% mass of ferrite pre-fired material to the above mixture in autumn, and then add ammonium bicarbonate with 0.8% mass of ferrite pre-fired material, set the speed at 29r / min, and mix for 30min;

[0031] ③Start ball milling, set the speed of the ball mill to 29r / min, continuously shower the outside with a large amount of water, measure the temperature of the internal mixture at 45-50°C, and the ball milling time is 14h;

[0032] ④ After the ball milling is finished, the material is discharged, and the ball mill is placed in the sedimentation tower for natural precipitation for 72 hours;

[0033] ⑤Remove the water in the upper layer of the mixed material after precipitation, and then take out the material while stirring under the stirring condition of 180...

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Abstract

The invention relates to the field of electromagnetic materials, and particularly provides a process for preparing permanent magnetic ferrite through two-stage ball milling and mixture. The process comprises the following steps: mixing a ferrite pre-sintering material, steel balls and water in a ball mill, sequentially adding boric acid and ammonium hydrogen carbonate, performing ball milling, precipitating and discharging. Particularly, the boric acid and ammonium hydrogen carbonate are added in the ball milling process instead of boric acid, thereby solving the problems of strontium escape in the production process of the current permanent magnetic ferrite product, gas hole formation in the sintering process, high product cracking possibility and the like; the yield is improved; the ammonium hydrogen carbonate is low in price, thereby effectively lowering the cost; and remarkable economic benefits are achieved.

Description

technical field [0001] The invention relates to the field of magnetic materials, and in particular provides a preparation process for permanent ferrite and its secondary ball milling mixture. Background technique [0002] The main raw material of the mesh magnets we produce is strontium zirconium permanent magnet material, referred to as permanent magnet strontium ferrite, and its main component is Fe 2 o 3 and SrCO 3 , Fe in primary pre-fired feedstock 2 o 3 About 70% or so, SrCO 3 It accounts for about 20%, and some other auxiliary materials are added according to the different characteristics of the material. For device manufacturers producing magnetic products, the strontium ferrite purchased from the raw material manufacturer cannot meet the customer's requirements for the first-time pre-fired material, so it is necessary to make appropriate adjustments to the second ball milling process to obtain ideal magnetic properties. Carry out secondary ball mill mixing pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/626
CPCC04B35/26C04B35/6261
Inventor 卢荷彬邓庆保谢红星龚舒平
Owner JINTAN MAGNETIC MATERIAL
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