CN109279889A - A kind of production method of permanent ferrite prefiring material - Google Patents
A kind of production method of permanent ferrite prefiring material Download PDFInfo
- Publication number
- CN109279889A CN109279889A CN201811235239.1A CN201811235239A CN109279889A CN 109279889 A CN109279889 A CN 109279889A CN 201811235239 A CN201811235239 A CN 201811235239A CN 109279889 A CN109279889 A CN 109279889A
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- China
- Prior art keywords
- iron oxide
- oxide red
- strontium carbonate
- ferrite prefiring
- production method
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
- C04B35/2633—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing barium, strontium or calcium
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3213—Strontium oxides or oxide-forming salts thereof
Abstract
A kind of production method of permanent ferrite prefiring material, the following steps are included: the mixture of permanent-magnet ferrite raw material iron oxide red and strontium carbonate is placed in mixing tower, add water, ammonium hydroxide, calcium gluconate, agitation grinding, controlling the mass ratio of iron oxide red and strontium carbonate in mixing tower upper end or lower end slurry is 5.95~6.65 ︰ 1, and the mass ratio of iron oxide red and strontium carbonate fluctuates≤0.10 ︰ 1 in mixing tower upper end or lower end slurry, obtains the mixture of composition correction；The mixture of composition correction is crushed by prior art dehydration, rotary kiln pre-burning, cooling kiln cooling, ball mill,.The present invention improves compounding process consistency problem, reduces the problem of properties of product consistency difference after sintering, the stability of energy effective guarantee product by adding appropriate ammonium hydroxide and calcium gluconate in ferrite prefiring material raw material mixed processes.
Description
Technical field
The present invention relates to a kind of production methods of permanent ferrite prefiring material, and in particular to a kind of permanent magnet that stability is good
The production method of ferrite prefiring material.
Background technique
Permanent-magnet ferrite is since the 1950s produces in batches, and technique tends to be mature, and performance significantly improves.But
Extensive steady production is high-end, high quality ferrite technology is still immature, and the permanent-magnet ferrite trade mark is various, magnet shape and size
It is different, user is also different to product quality requirement, brings difficulty to large-scale production.The permanent-magnet ferrite of the prior art
Pre-burning material manufacturing technique, there are still certain deficiency, properties of product stability is not high, and it is steady to directly influence downstream supply chain production
It is qualitative.
In the prior art, permanent ferrite prefiring material production has the following problems: iron oxide red is being stirred with strontium carbonate mixture
When mixing is ground in tower, the Preburning material that same batch (20.4T) product obtains under identical calcined temperature, in identical secondary formula
Intrinsic coercivity value difference reaches 150Oe under technique, and product stability is not high, influences subsequent production.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a kind of permanent ferrite prefiring material
Production method, can be improved the stability of ferrite prefiring material, reduce performance difference.
The technical solution adopted by the present invention to solve the technical problems is as follows:
The mixture of permanent-magnet ferrite raw material iron oxide red and strontium carbonate is placed in mixed by a kind of production method of permanent ferrite prefiring material
Expect to add water, ammonium hydroxide, calcium gluconate in tower, agitation grinding, controls iron oxide red and strontium carbonate in mixing tower upper end or lower end slurry
Mass ratio is 5.95~6.65 ︰ 1, and the mass ratio of iron oxide red and strontium carbonate fluctuates≤0.10 ︰ 1 in mixing tower upper end or lower end slurry
(such as: when the mass ratio of iron oxide red and strontium carbonate is 6.00 ︰ 1 in the slurry of upper end, the mass ratio of iron oxide red and strontium carbonate in the slurry of lower end
For 5.90~6.10 ︰ 1), the mixture (belonging to the slurrying stage) of composition correction is obtained；The mixture of composition correction is pressed into the prior art
Dehydration, rotary kiln pre-burning, cooling kiln cooling, ball mill crush,.
Further, the amount for adding water is 1.1~1.2 times of ferrite prefiring material raw material iron oxide red and strontium carbonate gross mass.
Further, add ammonium hydroxide amount be the 0.05-0.15%(of ferrite prefiring material raw material iron oxide red and strontium carbonate gross mass more
It is preferred that 0.10%).
Further, add the amount of calcium gluconate for the 0.05- of ferrite prefiring material raw material iron oxide red and strontium carbonate gross mass
0.15%(is more preferable 0.10%).
Further, the mass ratio of iron oxide red and strontium carbonate is 6.4~6.6 ︰ 1 in mixing tower upper end or lower end slurry.
Further, the mass ratio of iron oxide red and strontium carbonate fluctuates≤0.05 ︰ 1 in mixing tower upper end or lower end slurry.
Further, the agitation grinding time is 4-8 hours.
Agitation grinding can be used a stirring tower and two mating circular grindings of sand mill, i.e. mixture is from stirring tower bottom
It is pumped to different sand mills, while sand mill agitation grinding mixing peristaltic pump respectively with peristaltic pump, slurry will be mixed and sent to stirring
It mixes in tower.
Further, in mixing tower upper end or lower end slurry composition detection: take mixing tower upper end or lower end slurry to dry, lead to
It crosses x-ray fluorescence analyzer and carries out iron oxide red and strontium carbonate constituent analysis.
The present invention adds appropriate calcium gluconate in ferrite prefiring material raw mixture, and feed particles dispersion can be improved
Property, prevent raw material from reuniting；Appropriate ammonium hydroxide is added in ferrite prefiring material raw mixture, addition ammonium hydroxide can neutralize raw material iron
Remaining part Cl ion, further increases properties of product in red.If ammonium hydroxide addition is very few, effect is unobvious；If ammonium hydroxide adds
Excessively, volatilization generates pungent smell, influences shop safety production.Studies have shown that same amount of dispersing agent is under different PH
There is slurry viscosity difference to increase under the conditions of pH 9 weak base of < with pH value, and slurry viscosity reduces；As pH > 9, increase with pH value
Greatly, slurry viscosity also increases.Therefore adding appropriate calcium gluconate and ammonium hydroxide can prevent same materials from reuniting, and improve raw material
Graininess and dispersion homogeneity, while the sinking speed of raw material can be accelerated, it improves plurality of raw materials and mixes consistency, guarantee Preburning material
Consistence of composition is produced, the problem that properties of product difference is big after being sintered is reduced.In pre-burning stage ammonium hydroxide and gluconic acid
Calcium meeting pyrolytic is discharged with tail gas, on properties of product without influence.
The present invention is improved mixed by adding appropriate ammonium hydroxide and calcium gluconate in ferrite prefiring material raw material mixed processes
Material process consistency problem reduces the problem of properties of product consistency difference after sintering, the stability of energy effective guarantee product.
Detailed description of the invention
Fig. 1 is that figure is compared in the fluctuation of intrinsic coercive force of permanent magnetic ferrite obtained by Examples 1 to 7；
Fig. 2 is that figure is compared in the fluctuation of 1~3 gained intrinsic coercive force of permanent magnetic ferrite of comparative example.
Specific embodiment
Below with reference to embodiment, the invention will be further described.Chemical reagent used in other, unless otherwise specified,
Obtained by routine business approach.
The preparation of Preburning material
A kind of production method of permanent ferrite prefiring material, specific steps include: by permanent-magnet ferrite raw material iron oxide red and strontium carbonate
Mixture be placed in mixing tower, add water (for 1.1 times of ferrite prefiring material raw material iron oxide red and strontium carbonate gross mass), ammonium hydroxide,
Calcium gluconate agitation grinding 4 hours, takes stirring tower upper end or the drying of lower end slurry, carries out iron by x-ray fluorescence analyzer
It is red to be corrected with strontium carbonate ingredient, control the mass ratio of iron oxide red and strontium carbonate；And iron oxide red and carbon in mixing tower upper end or lower end slurry
The mass ratio of sour strontium fluctuates≤0.10 ︰ 1, obtains the mixture (belonging to the slurrying stage) of composition correction；The mixture that ingredient is corrected
Centrifugal dehydrator stirring tower is delivered to be dehydrated；Then high concentration ground paste is delivered to rotary kiln and carries out pre-burning, cooling kiln progress
It is cooling, it eventually enters into ball mill and is crushed,.
In embodiment 1, adding the amount of ammonium hydroxide is ferrite prefiring material raw material iron oxide red and the 0.05% of strontium carbonate gross mass plus Portugal
The amount of grape Calciofon is the 0.05% of ferrite prefiring material raw material iron oxide red and strontium carbonate gross mass, iron oxide red in the slurry of mixing tower upper end
Mass ratio with strontium carbonate is 6.50 ︰ 1；
In embodiment 2, adding the amount of ammonium hydroxide is ferrite prefiring material raw material iron oxide red and the 0.10% of strontium carbonate gross mass plus glucose
The amount of sour calcium is the 0.05% of ferrite prefiring material raw material iron oxide red and strontium carbonate gross mass, iron oxide red and carbon in the slurry of mixing tower upper end
The mass ratio of sour strontium is 6.50 ︰ 1；
In embodiment 3, adding the amount of ammonium hydroxide is ferrite prefiring material raw material iron oxide red and the 0.15% of strontium carbonate gross mass plus glucose
The amount of sour calcium is the 0.05% of ferrite prefiring material raw material iron oxide red and strontium carbonate gross mass, iron oxide red and carbon in the slurry of mixing tower upper end
The mass ratio of sour strontium is 6.50 ︰ 1；
In embodiment 4, adding the amount of ammonium hydroxide is ferrite prefiring material raw material iron oxide red and the 0.10% of strontium carbonate gross mass plus glucose
The amount of sour calcium is the 0.10% of ferrite prefiring material raw material iron oxide red and strontium carbonate gross mass, iron oxide red and carbon in the slurry of mixing tower upper end
The mass ratio of sour strontium is 6.50 ︰ 1；
In embodiment 5, adding the amount of ammonium hydroxide is ferrite prefiring material raw material iron oxide red and the 0.10% of strontium carbonate gross mass plus glucose
The amount of sour calcium is the 0.15% of ferrite prefiring material raw material iron oxide red and strontium carbonate gross mass, iron oxide red and carbon in the slurry of mixing tower upper end
The mass ratio of sour strontium is 6.50 ︰ 1；
In embodiment 6, adding the amount of ammonium hydroxide is ferrite prefiring material raw material iron oxide red and the 0.10% of strontium carbonate gross mass plus glucose
The amount of sour calcium is the 0.10% of ferrite prefiring material raw material iron oxide red and strontium carbonate gross mass, iron oxide red and carbon in the slurry of mixing tower upper end
The mass ratio of sour strontium is 6.45 ︰ 1；
In embodiment 7, adding the amount of ammonium hydroxide is ferrite prefiring material raw material iron oxide red and the 0.10% of strontium carbonate gross mass plus glucose
The amount of sour calcium is the 0.10% of ferrite prefiring material raw material iron oxide red and strontium carbonate gross mass, iron oxide red and carbon in the slurry of mixing tower upper end
The mass ratio of sour strontium is 6.55 ︰ 1.
The application of Preburning material
In embodiment 1-7,500g permanent magnet is respectively taken from same batch difference serial number section (see Table 1 for details for each embodiment bag number) respectively
Ferrite prefiring material is placed in ball mill, adds water 1000g, the slurry that average particle size is 0.8 μm is milled to, by the good slurry mistake of ball milling
It is 33wt% that filter, which is precipitated to water content,；Slurry after filtering precipitating is injected into mold, is 530kA/m in magnetic field strength, pressure is
Under conditions of 15Mpa, pressurization 65s is shaped to the round pie molding green compact of diameter of phi 30.1mm；Molding green compact are put into sintering electricity
In kiln, with heating rate for 3 DEG C/min, at 1170 DEG C, it is sintered 120min, the upper and lower surfaces of the cake through oversintering are ground
Polishing is cut, permanent-magnet ferrite is obtained.
Using TYU-2000 type auto measurement equipment for magnetic material, the magnetism of obtained permanent-magnet ferrite product can be carried out
Test, test result are shown in Table 1.
Permanent-magnet ferrite magnetic property tables of data obtained by 1 Examples 1 to 7 of table
Comparative example 1~3
Comparative example 1~3 and the difference of Examples 1 to 7 are only that: iron oxide red and strontium carbonate are in 50m3When stirring mixing grinding in tower,
Ammonium hydroxide and calcium gluconate are not added in comparative example, in comparative example 1,2,3 in the slurry of mixing tower upper end iron oxide red and strontium carbonate matter
For amount than being respectively 6.45,6.50,6.55, remaining condition is identical as embodiment.
Using TYU-2000 type auto measurement equipment for magnetic material, test can be carried out to the magnetism of obtained product, survey
Test result is referring to table 2.
2 comparative example of table, 1~3 gained permanent-magnet ferrite magnetic property tables of data
It combines Fig. 1,2 to compare it is found that in Examples 1 to 7 in table 1,2, is added with ammonium hydroxide and dispersing agent (gluconic acid- ca)
Batch, properties of product stability is higher than comparative example, and embodiment intrinsic coercivity error amount is adding ammonium hydroxide only within 75
For 0.10%, calcium gluconate 0.10%, the mass percent of iron oxide red and strontium carbonate is the comprehensive stability of product under different proportion
It can be all good.
In conclusion the method for the present invention can guarantee ferrite prefiring material production stability, reduce product intrinsic coercivity wave
Dynamic range, ensures permanent-magnet ferrite comprehensive magnetic energy.
Claims (8)
1. a kind of production method of permanent ferrite prefiring material, which comprises the following steps: by permanent-magnet ferrite raw material
The mixture of iron oxide red and strontium carbonate is placed in mixing tower, adds water, ammonium hydroxide, calcium gluconate, and agitation grinding controls mixing tower upper end
Or in the slurry of lower end the mass ratio of iron oxide red and strontium carbonate be 5.95~6.65 ︰ 1, and in mixing tower upper end or lower end slurry iron oxide red with
The mass ratio of strontium carbonate fluctuates≤0.10 ︰ 1, obtains the mixture of composition correction；The mixture that composition corrects is taken off by the prior art
Water, rotary kiln pre-burning, cooling kiln cooling, ball mill crush,.
2. the production method of permanent ferrite prefiring material according to claim 1, which is characterized in that the amount for adding water is iron oxygen
1.1~1.2 times of body Preburning material raw material iron oxide red and strontium carbonate gross mass.
3. the production method of permanent ferrite prefiring material according to claim 1 or 2, which is characterized in that add the amount of ammonium hydroxide
For the 0.05-0.15% of ferrite prefiring material raw material iron oxide red and strontium carbonate gross mass.
4. the production method of permanent ferrite prefiring material according to claim 1 or 2, which is characterized in that add gluconic acid
The amount of calcium is the 0.05-0.15% of ferrite prefiring material raw material iron oxide red and strontium carbonate gross mass.
5. the production method of permanent ferrite prefiring material according to claim 1 or 2, which is characterized in that mixing tower upper end
Or the mass ratio of iron oxide red and strontium carbonate is 6.4~6.6 ︰ 1 in the slurry of lower end.
6. the production method of permanent ferrite prefiring material according to claim 1 or 2, which is characterized in that mixing tower upper end
Or the mass ratio of iron oxide red and strontium carbonate fluctuates≤0.05 ︰ 1 in the slurry of lower end.
7. the production method of permanent ferrite prefiring material according to claim 1 or 2, which is characterized in that the stirring is ground
Time consuming is 4-8 hours.
8. the production method of permanent ferrite prefiring material according to claim 1 or 2, which is characterized in that mixing tower upper end
Or in the slurry of lower end composition detection: take mixing tower upper end or lower end slurry to dry, iron oxide red carried out by x-ray fluorescence analyzer
With strontium carbonate constituent analysis.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113045303A (en) * | 2021-03-22 | 2021-06-29 | 江苏启诚磁业有限公司 | Production method of permanent magnetic ferrite pre-sintered material |
| CN114031385A (en) * | 2021-10-22 | 2022-02-11 | 浙江安特磁材股份有限公司 | Method for preparing permanent magnetic ferrite material from high-chlorine iron oxide red |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113045303A (en) * | 2021-03-22 | 2021-06-29 | 江苏启诚磁业有限公司 | Production method of permanent magnetic ferrite pre-sintered material |
| CN114031385A (en) * | 2021-10-22 | 2022-02-11 | 浙江安特磁材股份有限公司 | Method for preparing permanent magnetic ferrite material from high-chlorine iron oxide red |
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Application publication date: 20190129 |