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Barium ferrite pre-sintered material and preparation method thereof

A technology of barium ferrite and pre-fired material, which is applied in the production process of permanent magnet ferrite, can solve the problems of low Hcj index, high price, and low bonding performance of pre-fired material, and achieve simple process and low production cost Effect

Inactive Publication Date: 2010-12-29
MCC HENGTONG COLD ROLLING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If iron scale is used as the raw material, the magnetic properties of the calcined material are Br=2000±100Gs, Hcj=1800±100Oe, if iron red is used as the raw material, the magnetic properties of the calcined material are Br=1500±100Gs, Hcj=2000±100Oe, The calcined materials produced by the above two raw materials have low bonding performance, especially the low Hcj index, which cannot meet the bonding requirements of high-quality products.
If iron scale, iron concentrate + strontium carbonate are used as raw materials, since the price of strontium carbonate is much higher than that of barium carbonate, the production cost of the product will be increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Mix raw material iron oxide and barium carbonate powder, its molar ratio is 5.9:1, and described raw material iron oxide is acid regeneration by-product iron oxide powder;

[0022] Carry out wet ball milling on the mixture, and the ball milling time is 1.5 hours; after ball milling, the composition of the mixture is uniform, and the particle size of the slurry is fine and the distribution is narrow;

[0023] After ball milling, put it into a rotary kiln for pre-firing. The pre-firing temperature is 1020°C, and the holding time is controlled at 3.2 hours. After pre-firing, barium ferrite is formed;

[0024] The calcined material is put into a ball mill for dry rough grinding, and the particle size after dry grinding is 4.2 μm, which ensures that a good particle size distribution can be obtained after ball milling.

[0025] The performance index of barium ferrite calcined material is: average particle size: 4.2μm, compacted Br=1260Gs, compacted Hcj=3320Oe.

Embodiment 2

[0027] The raw material iron oxide and barium carbonate powder are mixed, and its molar ratio is 5.6:1, and described raw material iron oxide is acid regeneration by-product iron oxide powder;

[0028] The mixture is subjected to wet ball milling, and the ball milling time is 2 hours; after ball milling, the composition of the mixture is uniform, and the particle size of the slurry is fine and the distribution is narrow;

[0029] After ball milling, put it into a rotary kiln for pre-firing, the pre-firing temperature is 1100°C, and the holding time is controlled at 4 hours to form barium ferrite after pre-firing;

[0030] The calcined material is put into a ball mill for dry rough grinding, and the particle size after dry grinding is 3.5 μm, which ensures that a good particle size distribution can be obtained after ball milling.

[0031] The performance indicators of this barium ferrite calcined material are: average particle size: 3.5μm, compact Br=1265Gs, compact Hcj=3260Oe....

Embodiment 3

[0033] The raw material iron oxide and barium carbonate powder are mixed, and its molar ratio is 5.4:1, and described raw material iron oxide is acid regeneration by-product iron oxide powder;

[0034] Perform wet ball milling on the mixture, and the ball milling time is 3 hours; after ball milling, the composition of the mixture is uniform, and the particle size of the slurry is fine and the distribution is narrow;

[0035] After ball milling, put it into the rotary kiln for pre-fired, the pre-fired temperature is 1120 ℃, the holding time is controlled at 4.2 hours after pre-fired barium ferrite;

[0036] The calcined material is put into a ball mill for dry rough grinding, and the particle size after dry grinding is 3.2 μm, which ensures that a good particle size distribution can be obtained after ball milling.

[0037] The performance indicators of this barium ferrite calcined material are: average particle size: 3.2μm, compact Br=1268Gs, compact Hcj=3200Oe.

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Abstract

The invention provides a barium ferrite pre-sintered material and a preparation method thereof, wherein the barium ferrite pre-sintered material is suitable for producing product raw materials of refrigerator door seals, toys for children, advertising and the like. The technical scheme comprises the following steps: (1) mixing a by-product ferric oxide powder regenerated by acid with barium carbonate power; (2) performing wet ball-milling on the mixture to form slurry; (3) directly performing pre-sintering on the slurry; and (4) performing dry coarse grinding on the pre-sintered material. The invention has the beneficial effects that pelletizing, drying and granulation are not required and any additive is in no need of being added by reasonably selecting raw materials and optimizing the formula and the technology, thus being capable of producing the barium ferrite pre-sintered material with high performance. The invention has the advantages of simple procedure, low production cost and low energy consumption.

Description

Technical field: [0001] The invention relates to a production process of permanent magnet ferrite, in particular to a barium ferrite calcined material suitable for manufacturing refrigerator door seals, children's toys, advertisements and other product raw materials and a preparation method thereof. Background technique: [0002] my country's annual output of permanent magnet ferrite ranks first in the world, and it is a major producer of magnetic materials. China's ferrite industry has basically maintained a growth rate of more than 20% for several years, and its output has doubled every five years on average. Since the 1990s, with the increasing use of bonded ferrite, its demand has grown rapidly. Among them, the annual demand for isotropic magnetic coils used in the manufacture of refrigerator door seals, magnetic door and window seals, children's toys, and advertising has reached 10,000 tons in North America alone; Anisotropic magnetic coils (currently, mainly used in ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 韩继征孙长杰谢强邢纪萍
Owner MCC HENGTONG COLD ROLLING TECH
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