CN112723871B - High-magnetic permanent magnetic ferrite magnetic shoe and preparation method thereof - Google Patents

High-magnetic permanent magnetic ferrite magnetic shoe and preparation method thereof Download PDF

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CN112723871B
CN112723871B CN202011599177.XA CN202011599177A CN112723871B CN 112723871 B CN112723871 B CN 112723871B CN 202011599177 A CN202011599177 A CN 202011599177A CN 112723871 B CN112723871 B CN 112723871B
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parts
slurry
preparation
permanent magnetic
magnetic shoe
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CN112723871A (en
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朱月红
孔德春
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Nanjing Ruiyang New Material Technology Co ltd
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Nanjing Ruiyang New Material Technology Co ltd
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
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    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
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Abstract

The application relates to the technical field of magnetic shoe preparation, and particularly discloses a high-magnetism permanent magnetic ferrite magnetic shoe and a preparation method thereof. The magnetic shoe is prepared from the following raw materials in parts by weight: 14-18 parts of iron oxide red, 1.5-3.5 parts of strontium carbonate, 0.5-2 parts of aluminum oxide, 2-3 parts of calcium carbonate, 0.5-1 part of low-melting point stabilizer and 0.5-1.5 parts of forming agent; the preparation method of the magnetic shoe comprises the steps of wet mixing, precipitation, ball milling, blank making and sintering; the high-magnetism permanent magnetic ferrite magnetic shoe can be used for preparing motors for household appliances, has higher Br and Hcj, is easy to form and higher in breaking strength, and is not easy to burn after the motors work for a long time; in addition, the preparation method is simple and easy to operate, and the prepared magnetic shoe finished product is high in qualification rate.

Description

High-magnetic permanent magnetic ferrite magnetic shoe and preparation method thereof
Technical Field
The application relates to the technical field of magnetic shoe preparation, in particular to a high-magnetism permanent magnetic ferrite magnetic shoe and a preparation method thereof.
Background
The magnetic shoe is a tile-shaped magnet made of permanent ferrite material and is mainly used for excitation of a permanent magnet motor. The remanence (Br), the magnetically induced coercivity (Hcb), the intrinsic coercivity (Hcj) and the maximum magnetic energy product (BH) max of the permanent magnetic ferrite have important influences on the performance of the magnetic shoe.
The Chinese patent with publication number CN103058641B discloses a method for preparing a non-rare earth high magnetic permanent magnetic ferrite material, which comprises the following steps: the method comprises a material mixing process, a presintering process, a coarse crushing process, a fine grinding process and a forming process, wherein the presintering material is mixed and crushed in the material mixing process, the presintering material comprises main components, auxiliary components and grinding aids, and the main components are Fe 2 O 3 ：80.7wt％～87.0wt％，SrCO 3 :12.1 to 13.3 weight percent of CaCO as an auxiliary component 3 ：0.1wt％～1.5wt％；SiO 2 :0.2wt％～1.0wt％；Al 2 O 3 :0 to 3.0 weight percent of grinding aid: 0.5 to 1.2 weight percent; the high-magnetism permanent magnetic ferrite material is prepared by the formula of the related technology, and achieves the effect that the Br is more than or equal to 400mT and the Hcj is more than or equal to 322.3 kA/m.
In view of the above related art, the inventors consider that adding calcium carbonate to the formulation increases Br of the permanent ferrite tile, but calcium carbonate also causes coarsening of crystal grains, reduces Hcj of the permanent ferrite tile, and further affects high magnetism of the permanent ferrite.
Disclosure of Invention
In order to solve the problem of coarsening of crystal grains caused by calcium carbonate, the application provides a high-magnetism permanent magnetic ferrite magnetic shoe and a preparation method thereof.
The application provides a high-magnetism permanent magnetic ferrite magnetic shoe which adopts the following technical scheme:
a high-magnetism permanent magnetic ferrite magnetic shoe is prepared from the following raw materials in parts by weight: 14-18 parts of iron oxide red, 1.5-3.5 parts of strontium carbonate, 0.5-2 parts of aluminum oxide, 2-3 parts of calcium carbonate, 0.5-1 part of low-melting point stabilizer and 0.5-1.5 parts of forming agent.
In the related art and the application, the auxiliary components are aluminum oxide and calcium carbonate and Al is used 3+ For Fe 3+ The aluminum oxide has the effect of inhibiting the growth of grains, and improves the Hcj of the permanent magnetic ferrite magnetic shoe, so that the motor has stronger temperature stability; however, aluminum oxide reduces the Br of the permanent ferrite tile, resulting in reduced power of the motor; calcium carbonate can promote flattening of crystal grains and promote densification of permanent magnetic ferrite, so that Br of the permanent magnetic ferrite magnetic shoe is improved, but calcium carbonate is added, so that the crystal grains are easily coarsened, and Hcj of the permanent magnetic ferrite magnetic shoe is reduced;
in order to solve the problem of coarsening of grains caused by adding calcium carbonate, the application also adds a low-melting-point stabilizer and a forming agent, wherein the low-melting-point stabilizer can slow down the growth speed of the grains and is beneficial to making up the defects caused by the calcium carbonate, but the addition of the low-melting-point stabilizer is not beneficial to the forming of the permanent magnetic ferrite and affects the yield of finished products of the magnetic tiles; the forming agent is beneficial to forming a compact structure of the permanent magnetic ferrite and improving the qualification rate of finished products of the permanent magnetic ferrite magnetic shoe; therefore, the application takes aluminum oxide and calcium carbonate as auxiliary components, adds a low-melting-point stabilizer into the auxiliary components, and is matched with a forming agent, thereby being beneficial to preparing the permanent magnetic ferrite tile with high Br and high Hcj and ensuring the permanent magnetic ferrite tile to have higher finished product qualification rate;
in addition, the ratio of the iron oxide red to the strontium carbonate in the total mass of the raw materials is smaller than that of Fe of a non-rare-earth high-magnetism permanent magnetic ferrite material in the related art 2 O 3 And SrCO 3 The ratio of the raw materials is higher than that of the non-rare-earth high-magnetism permanent magnetic ferrite material in the related art, so that the ratio of the raw materials is favorable for improving the Br and the Hcj of the permanent magnetic ferrite magnetic tile and saving the cost.
Preferably, the material is prepared from the following raw materials in parts by weight: 15-17 parts of iron oxide red, 2.2-2.8 parts of strontium carbonate, 1-1.5 parts of aluminum oxide, 2.3-2.7 parts of calcium carbonate, 0.65-0.75 part of low-melting-point stabilizer and 0.8-1.2 parts of forming agent.
By adopting the technical scheme, under the raw material proportion, the reduction of the aluminum oxide to the Br of the permanent magnetic ferrite tile and the reduction of the calcium carbonate to the Hcj of the permanent magnetic ferrite tile are facilitated to be reduced, so that the prepared permanent magnetic ferrite tile has higher Br and Hcj.
Preferably, the low melting point stabilizer comprises silicon dioxide and boric acid, wherein the weight ratio of the silicon dioxide to the boric acid is 3 (2-5).
By adopting the technical scheme, boric acid and silicon dioxide generate a low-melting-point compound, the melting point of the low-melting-point compound is lower than that of silicon dioxide, and the low-melting-point compound has the effect of inhibiting the growth of crystal grains, so that the Hcj of the permanent magnetic ferrite tile is improved, and the heat-resistant stability of the permanent magnetic ferrite tile is improved; therefore, the low-melting-point stabilizer is beneficial to improving the Hcj and heat-resistant stability of the permanent magnetic ferrite tile, so that the permanent magnetic ferrite tile is reduced in scalding.
Preferably, the weight ratio of the silicon dioxide to the boric acid is 6 (7-9).
By adopting the technical scheme, the consumption of the boric acid is slightly more than that of the silicon dioxide, so that the boric acid can fully react with the silicon dioxide, and a low-melting-point compound is generated, and therefore, the Hcj of the permanent magnetic ferrite magnetic shoe is further improved under the proportion of the silicon dioxide and the boric acid.
Preferably, the forming agent is one or a combination of two of ammonium bicarbonate and calcium bicarbonate.
By adopting the technical scheme, as the ammonium bicarbonate and the calcium bicarbonate are adopted, the neutralization reaction can be carried out with the acid components in the formula, the viscosity of the permanent magnetic ferrite slurry is reduced, the fluidity of the slurry is increased, the permanent magnetic ferrite magnetic tile with a compact structure is convenient to manufacture, and the finished product qualification rate of the permanent magnetic ferrite magnetic tile is improved.
Preferably, 0.5 to 1 part by weight of calcium alginate is also included.
By adopting the technical scheme, as the calcium alginate is adopted, the molecular chain of the calcium alginate contains hydroxyl and carboxyl, and the bonding effect is generated between the calcium alginate and the aluminum oxide, so that the calcium alginate/aluminum oxide composite fiber is generated, and the composite fiber has stronger heat-resistant stability and breaking strength, is beneficial to improving the heat-resistant stability and breaking strength of the permanent magnetic ferrite tile, and reduces the burning of the permanent magnetic ferrite tile.
Preferably, 0.5-1 weight part of polyethylene glycol is also included.
By adopting the technical scheme, the polyethylene glycol is adopted, so that the polyethylene glycol is favorable for uniformly dispersing the calcium alginate/aluminum oxide composite fiber, the density of the prepared permanent magnetic ferrite magnetic shoe is more uniform, and the flexural strength of the permanent magnetic ferrite magnetic shoe is improved; meanwhile, the heat resistance stability of the permanent magnetic ferrite tile is improved.
The application provides a preparation method of a high-magnetism permanent magnetic ferrite magnetic shoe, which adopts the following technical scheme: comprises the following preparation steps of the preparation method,
wet mixing: according to parts by weight, uniformly mixing iron oxide red, strontium carbonate, aluminum oxide, calcium carbonate, a low-melting point stabilizer and a forming agent in a wet mixing mode to obtain wet mixed slurry I;
precipitation: precipitating the wet mixed slurry I to obtain precipitated slurry I;
ball milling: ball milling is carried out on the precipitation slurry I to obtain ground slurry I;
blank manufacturing: dehydrating the ground slurry I, and preparing a preform I;
sintering: sintering the preform I, firing for 8-12 hours, and cooling to obtain the high-magnetism permanent magnetic ferrite magnetic shoe.
By adopting the technical scheme, each component in the raw materials is subjected to wet mixing, sedimentation and ball milling, and is fully mixed, so that the uniformity of the components in the preform is improved.
The application also provides a preparation method of the high-magnetism permanent magnetic ferrite magnetic shoe, which adopts the following technical scheme: comprises the following preparation steps of the preparation method,
wet mixing: according to the weight parts, uniformly mixing iron oxide red, strontium carbonate, aluminum oxide and calcium carbonate in a wet mixing mode to obtain wet mixed slurry II;
precipitation: precipitating the wet mixed slurry II to obtain precipitated slurry II;
presintering: adding a low-melting point stabilizer into the precipitation slurry II, dehydrating the precipitation slurry II, presintering a dehydrated product, cooling the presintering product, and crushing to obtain a preparation material;
ball milling: adding a forming agent into a preparation material for blending to obtain a blend, and carrying out wet ball milling on the blend to obtain milled slurry II;
blank manufacturing: dehydrating the ground slurry II, and preparing a blank to prepare a preform II;
sintering: sintering the preform II, firing for 8-12 hours, and cooling to obtain the high-magnetism permanent magnetic ferrite magnetic shoe.
By adopting the technical scheme, the low-melting-point stabilizer is added after precipitation, which is helpful for reducing the loss of the low-melting-point stabilizer; the precipitation slurry II and the low-melting-point stabilizer are pre-sintered, and then the forming agent and the preliminary material are subjected to wet ball milling together, so that the influence caused by the reaction of the forming agent and the low-melting-point stabilizer is reduced.
Preferably, 0.5 to 1 part by weight of calcium alginate and 0.5 to 1 part by weight of polyethylene glycol are further added in the ball milling step.
By adopting the technical scheme, calcium alginate and polyethylene glycol are uniformly dispersed in the precipitation slurry through the ball milling process, so that the finally generated calcium alginate/aluminum oxide composite fiber is uniformly dispersed in the permanent magnetic ferrite tile, and the heat-resistant stability and the flexural strength of the permanent magnetic ferrite tile are improved.
In summary, the application has the following beneficial effects:
1. the application adopts the stabilizer with low melting point and the forming agent, thereby being beneficial to preparing the permanent magnetic ferrite magnetic shoe with high Br and high Hcj and improving the qualification rate of the finished product of the permanent magnetic ferrite magnetic shoe;
2. because the proportion of the main component is smaller than that of the main component in the related technology, and the permanent magnetic ferrite tile with high Br and high Hcj is prepared, the raw material proportion of the application is beneficial to saving the cost;
3. in the application, silicon dioxide and boric acid are preferable, and the boric acid and the silicon dioxide generate low-melting-point compounds, so that the low-melting-point compounds are beneficial to improving the Hcj and heat-resistant stability of the permanent magnetic ferrite tile, thereby reducing the scalding of the permanent magnetic ferrite tile;
4. the weight ratio of the silicon dioxide to the boric acid is preferably 6 (7-9), which is favorable for generating low-melting-point compounds and further improving the Hcj of the permanent magnetic ferrite magnetic shoe;
5. in the application, ammonium bicarbonate and calcium bicarbonate are preferable, so that the permanent ferrite magnetic shoe is shaped; meanwhile, the breaking strength of the permanent ferrite magnetic shoe can be improved;
6. in the application, calcium alginate is preferred, and calcium alginate/aluminum oxide composite fiber is generated, which is beneficial to improving the heat-resistant stability and the flexural strength of the permanent magnetic ferrite magnetic shoe;
7. the two methods disclosed by the application are simple and easy to operate, and the finished product qualification rate of the magnetic shoe is high; another helps to reduce the loss of the low melting point stabilizer and also helps to reduce the impact of the reaction of the forming agent with the low melting point stabilizer.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials used in this example are all commercially available. Wherein the iron oxide red is purchased from Shijia Changli mineral Co., ltd, and has a particle size of 325-1250 mesh; strontium carbonate is purchased from Nantong Runtong petrochemical industry Co., ltd, and has granularity of 200 meshes; aluminum oxide is purchased from Nantong Runtong petrochemical Co., ltd., model CR10; calcium carbonate is purchased from Yizhou New Yu chemical technology Co., ltd, and has a particle size of 1250 mesh; silica was purchased from Jiangxi Baiying biotechnology Co., ltd; boric acid was purchased from Xin chemical products Co., ltd; ammonium bicarbonate is purchased from Hongsheng bioengineering Co., ltd; calcium bicarbonate is purchased from Anhui Hongshang bioengineering Co., ltd; calcium alginate was purchased from Anhui, hongsheng bioengineering Co., ltd; polyethylene glycol is purchased from Jiangxi Maosheng chemical industry Co., ltd, and has a molecular weight of 5500-7000.
Preparation of raw materials
Preparation examples 1 to 6
As shown in Table one, the main difference between preparation examples 1 to 6 is the weight ratio of the raw materials.
The following will describe preparation example 1 as an example.
The preparation method of the low-melting point stabilizer provided in preparation example 1 comprises the following steps:
adding silicon dioxide and boric acid into a reaction kettle, and stirring for 10min to obtain the low-melting-point stabilizer.
List one
Examples
Examples 1 to 12
As shown in Table II, examples 1 to 12 were mainly different in the ratio of the raw materials.
The following description will take example 1 as an example.
A high-magnetism permanent magnetic ferrite magnetic shoe is prepared according to the following steps:
s1, wet mixing: adding iron oxide red, strontium carbonate, aluminum oxide and calcium carbonate into a stirrer, and wet mixing for 5 hours to obtain wet mixed slurry II with the water content of 85%;
s2, precipitation: adding the wet mixed slurry II into a precipitation tank, and precipitating to obtain precipitated slurry II with the water content of 42%;
s3, presintering: adding a low-melting point stabilizer and the precipitation slurry II into a reaction kettle together, stirring for 15min, dehydrating until the water content is 15%, obtaining a dehydrated product, presintering the dehydrated product, gradually heating the dehydrated product to 800 ℃ from 600 ℃, presintering for 2 hours, naturally cooling the presintering product to room temperature, and then placing the presintering product into a crusher, and crushing until the particle size is 2-3 mu m, thus obtaining a preparation material;
s4, ball milling: adding the preparation material and the forming agent into a ball mill, and performing wet ball milling until the particle size is 0.6-0.7 mu m to obtain milled slurry II with the water content of 80%;
s5, blank making: dehydrating the ground slurry II to 30% of water content to obtain slurry II, and pressing the slurry II into a preform II with a density of 3.4g/cm by using a 150 ton automatic hydraulic press and a hard alloy runner mold 2 ；
S6, sintering: and firing the preform II at 1200 ℃ for 10 hours, and naturally cooling to room temperature to obtain the high-magnetism permanent magnetic ferrite magnetic tile.
Watch II
Example 13
A high magnetic permanent ferrite tile differing from embodiment 8 in that: in the ball milling step, 0.75kg of calcium alginate was added to the preparation for ball milling.
Example 14
A high magnetic permanent ferrite tile differing from embodiment 13 in that: in the ball milling step, 0.75kg of polyethylene glycol was added to the preparation for ball milling.
Example 15
A high magnetic permanent ferrite tile differing from embodiment 8 in that: the preparation method comprises the following steps of,
(1) Wet mixing: adding iron oxide red, strontium carbonate, aluminum oxide, calcium carbonate, a low-melting point stabilizer and a forming agent into a ball mill, and wet mixing for 5 hours to obtain wet mixed slurry I with the water content of 85%;
(2) Precipitation: adding the wet mixed slurry I into a precipitation tank, and precipitating to obtain precipitated slurry I with the water content of 42%;
(3) Ball milling: adding the precipitation slurry I into a ball mill, and performing wet ball milling until the particle size of the precipitation slurry I is 0.6-0.7 mu m to obtain milled slurry I;
(4) Blank manufacturing: dehydrating the ground slurry I to 30% of water content to obtain slurry I, and pressing the slurry I into a preform I with a density of 3.4g/cm by using a 150 ton automatic hydraulic press and a hard alloy runner mold 2 ；
(5) Sintering: and firing the preform I at 1200 ℃ for 10 hours, and naturally cooling to room temperature to obtain the high-magnetism permanent magnetic ferrite magnetic shoe.
Comparative examples
Comparative examples 1 to 3
As shown in Table III, comparative examples 1 to 3 differ from example 14 in the raw materials and the amounts of the low melting point stabilizer.
Watch III
Comparative example
Comparative example 1
A non-rare earth high magnetic permanent magnetic ferrite material is prepared by the step of the embodiment B-1 with the authorized bulletin number of CN103058641B in the related technology to obtain a permanent magnetic ferrite sample.
Comparative examples 2 to 6
As shown in Table IV, comparative examples 2 to 6 differ from example 8 in the ratio of the raw materials.
Table four
Performance test
For the permanent magnetic ferrite tiles provided in examples 1 to 15, comparative examples 1 to 3 and comparative examples 1 to 6, the following performance tests were conducted, and the test data are shown in Table five.
Wherein Br, hcb, hcj and (BH) maxb of the permanent magnet ferrite magnetic shoe are detected according to GB/T3217-2013 magnetic test method of permanent magnet (hard magnetic) material.
And using a WEW-1000D type hydraulic universal material testing machine to detect the flexural strength of the permanent magnetic ferrite magnetic shoe at a moving speed of 2 mm/min.
And randomly extracting 200 permanent magnetic ferrite tiles prepared in each embodiment, each comparative embodiment and each comparative embodiment, observing whether the surface of the permanent magnetic ferrite tile has cracks and whether the surface is flat, taking the permanent magnetic ferrite tile with the flat surface and no cracks as a qualified finished product, and calculating to obtain the qualified rate of the finished product of the permanent magnetic ferrite tile.
The permanent magnetic ferrite tiles prepared in each example, comparative example and comparative example are installed in motors of the same specification, and work for 6 hours at an ambient temperature of 20 ℃ and a power of 45 kw, and the temperature of the motor surface is measured by using a wireless infrared thermometer to obtain the surface temperature after the motor works for 6 hours, so as to detect the heat-resistant stability of the permanent magnetic ferrite tile.
TABLE five
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The present application will be described in detail below with reference to the test data provided in table five.
The ratio of the raw materials to be added in examples 1 to 5 was compared. As a result, it was found that the products in examples 1 to 5 had Br more than 410mT and Hcj more than 328 Hcj/(kA/m), which suggests that the present application is useful for the production of permanent magnet ferrite tiles having both high Br and high Hcj.
In addition, the effect of the weight ratio of silica to boric acid in the low melting point stabilizer was examined in examples 6 to 10 according to the present application with reference to example 5. As a result, in examples 7 to 10, since the amount of boric acid added was relatively large compared with that of silica, the Hcj of the product was high, and the surface temperature was low after 6 hours of operation, which indicated that the amount of boric acid was slightly larger than that of silica, which was advantageous for further improving the Hcj and heat resistance stability of the permanent magnet ferrite tile, and example 8 was relatively excellent.
In the present application, the effect of the addition amounts of ammonium bicarbonate and calcium bicarbonate in the molding agent was examined in examples 11 to 12, with reference to example 8. As a result, in example 8, the flexural strength of the product was found to be high due to the addition of only ammonium bicarbonate.
In the application, by taking example 8 as a comparison, calcium alginate is added in example 13, so that the flexural strength of the product is improved, and the heat-resistant stability of the product is improved.
In the application, the polyethylene glycol is added in the embodiment 14 by taking the embodiment 13 as a comparison, so that the flexural strength of the product is improved, and the heat-resistant stability of the product is improved.
In contrast to example 8, in example 15 of the present application, the low melting point stabilizer was added simultaneously with the forming agent and no pre-sintering step was performed, and the product of example 15 had both higher Br and Hcj, but Hcj was slightly lower than that of the product of example 8, and the surface temperature after 6h of operation was slightly higher than that after 6h of operation of the product of example 8.
Compared to example 14, the Hcj of the product of comparative example 1 was reduced and the surface temperature was increased after 6 hours of operation, since no silica was used; since boric acid was not used, hcj of the product of comparative example 2 was reduced and the surface temperature was increased after 6 hours of operation; since acetic acid was not used instead of boric acid, hcj of the product of comparative example 3 was reduced, and the surface temperature was increased after 6 hours of operation, which was comparable to that of the product of comparative example 2.
In comparison with examples 1 to 15, fe in comparative example 1 2 O 3 And SrCO 3 The ratios of iron oxide red and strontium carbonate in examples 1-15 are all larger, but the product of comparative example 1 has reduced performance, which means that the raw material ratio of the present application contributes to cost saving.
The amounts of iron oxide red added in comparative examples 2 to 3 were all outside the ranges described in the claims of the present application, and the product properties of comparative examples 2 to 3 were lowered, as compared with example 8.
Compared with example 8, the yield of the finished product of comparative example 4 is greatly reduced because no forming agent is adopted; the product of comparative example 5 has greatly reduced performance due to the absence of low melting point stabilizers and molding agents; the product performance of comparative example 6 was greatly reduced, but slightly better than that of comparative example 5, since boric acid and a molding agent were not used.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.

Claims (1)

1. The high-magnetism permanent magnetic ferrite magnetic shoe is characterized by being prepared from the following raw materials in parts by weight: 16 parts of iron oxide red, 2.5 parts of strontium carbonate, 1.25 parts of aluminum oxide, 2.5 parts of calcium carbonate, 0.7 part of low-melting-point stabilizer, 1.0 part of forming agent, 0.75 part of calcium alginate and 0.75 part of polyethylene glycol; the low-melting-point stabilizer comprises silicon dioxide and boric acid, wherein the weight ratio of the silicon dioxide to the boric acid is 3:4, and the forming agent is ammonium bicarbonate; the preparation method of the high-magnetism permanent magnetic ferrite magnetic shoe comprises the following preparation steps:
wet mixing: adding iron oxide red, strontium carbonate, aluminum oxide and calcium carbonate into a stirrer, and wet mixing for 5 hours to obtain wet mixed slurry II with the water content of 85%;
precipitation: adding the wet mixed slurry II into a precipitation tank, and precipitating to obtain precipitated slurry II with the water content of 42%;
presintering: adding a low-melting point stabilizer and the precipitation slurry II into a reaction kettle together, stirring for 15min, dehydrating until the water content is 15%, obtaining a dehydrated product, presintering the dehydrated product, gradually heating the dehydrated product to 800 ℃ from 600 ℃, presintering for 2 hours, naturally cooling the presintering product to room temperature, and then placing the presintering product into a crusher, and crushing until the particle size is 2-3 mu m, thus obtaining a preparation material;
ball milling: adding the preparation material, the forming agent, the calcium alginate and the polyethylene glycol into a ball mill, and performing wet ball milling until the particle size is 0.6-0.7 mu m to obtain milled slurry II with the water content of 80%;
blank manufacturing: dehydrating the ground slurry II to 30% of water content to obtain slurry II, and pressing the slurry II into a preform II with a density of 3.4g/cm by using a 150 ton automatic hydraulic press and a hard alloy runner mold 2 ；
Sintering: and firing the preform II at 1200 ℃ for 10 hours, and naturally cooling to room temperature to obtain the high-magnetism permanent magnetic ferrite magnetic tile.
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