CN109485099A - A method of it is directly that raw material prepares barium ferrite using low-grade witherite - Google Patents
A method of it is directly that raw material prepares barium ferrite using low-grade witherite Download PDFInfo
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- C01G49/00—Compounds of iron
- C01G49/0018—Mixed oxides or hydroxides
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Abstract
A method of it is directly that raw material prepares barium ferrite using low-grade witherite, the present invention uses low-grade witherite mineral for raw material, soaks mine by wet process, rationally matches liquid, chemical coprecipitation synthesis, the technological means synthesizing barium ferrite product such as high-temperature calcination.In the present invention, leaching process witherite and hydrochloric acid mass ratio are 1 ︰, 1~1 ︰ 5, and the solid-to-liquid ratio (g/ml) of witherite and water is 1 ︰, 2~1 ︰ 9, and extraction temperature is 30 DEG C~90 DEG C, and extraction time is 1h~6h；Precipitation process pH range is 8~12；Calcination process calcination temperature is 700 DEG C~1400 DEG C, and calcination time is 1h~6h.The present invention makes full use of local low-grade witherite mineral, has good Social benefit and economic benefit while obtained high added value barium ferrite product.With it is existing prepare barium ferrite technology compared with, the advantages of present invention had not only remained its magnetic property, but also overcome its many deficiency, so that preparation totle drilling cost is lower.
Description
Technical field
The present invention relates to hydrometallurgys, the preparation field of barium ferrite, in particular to a kind of directly to utilize low-grade poison weight
Stone is the method that raw material prepares barium ferrite.
Background technique
Barium ferrite material has a wide range of applications in device elements such as instrument and meter, electroacoustic motor, magnetic separation magnetization.Barium iron
Oxysome belongs to research, and a kind of permanent-magnet material, the expression formula of compound can be write as BaFe earlier12O19。
People prepare the process of barium ferrite, actually just contain the process of adjustment Ba/Fe ratio.In the prior art,
The method for preparing barium ferrite includes mechanical attrition method, chemical coprecipitation, sol-gal process, hydro-thermal method, self propagating high temperature conjunction
At method etc..However, raw material used when with these methods to prepare barium ferrite, is chlorate, the oxidation of high-purity
Object and molysite etc..
It itself is exactly from Raw Ore by a series of due to the chlorate, oxide and molysite as chemical products
What complicated technical process just decomposited, such as barium chloride, barium monoxide, barium hydroxide, be exactly using witherite mineral as raw material and
It produces；And the main component of barium ferrite itself but be barium and iron compound in the case where, this is just first passed through at people
Then again further through a series of complex technical process a series of complex process separates the barium in witherite mineral with impurity,
Allow barium and iron chemical combination.
Not only consume a large amount of resource, the energy in this way, and also create the acid of institute's adapted in two technical process,
The waste of great manpower and material resources cost in the reagents such as alkali, salt and finished product forming process.
Summary of the invention
Present invention aim to address in the prior art, prepare barium ferrite not only expend resource, the energy also and can waste it is big
The problems such as measuring manpower.
To realize the present invention purpose and the technical solution adopted is that such, a kind of is directly original using low-grade witherite
The method that material prepares barium ferrite, which comprises the following steps:
1) barium chloride solution is prepared
1.1) witherite after ball milling being sieved is added in hydrochloric acid solution, stirring, wet-leaching；
The weight ratio of the witherite and hydrochloric acid solution is 1 ︰, 1~1 ︰ 5；
The witherite and the w/v (g ︰ mL) of water stated is 1 ︰, 2~1 ︰ 9；
The temperature of the leaching is 30~90 DEG C, and extraction time is 1~6h；
1.2) liquid after leaching obtained in step 1.1) is filtered, isolated solid phase and liquid phase will be consolidated
It is mutually washed, the liquid after collecting washing；
1.3) after mixing the liquid after liquid phase and washing after separating obtained in step 1.2), mixture A is obtained；
It is total to after pH value adjustment 8~12 in the mixed solution that natrium carbonicum calcinatum and sodium hydroxide is added in mixture A
Precipitation reaction；
The molar ratio of metal ion total amount and natrium carbonicum calcinatum in the mixture A is 1 ︰ 1.5；
2) barium ferrite powder is prepared
2.1) mixture after progress coprecipitation reaction in step 1.3) is filtered, obtains filtrate and filter cake, used
Distilled water is by Washing of Filter Cake to neutrality, then filter cake is placed in drying box and is dried, and obtains barium ferrite precursor powder；
The drying time is 1~5h, and the drying temperature is 60 DEG C~100 DEG C；
2.2) barium ferrite precursor powder obtained in step 2.1) is placed in temperature programming Muffle furnace and is calcined,
Obtain barium ferrite product；
The calcination temperature is 700 DEG C~1400 DEG C；Calcination time is 1h~6h.
Further, in the whipping process in the step 1.1): stirring rate is 150~350r/min, mixing time 1
~5h.
Effect of the invention is unquestionable, the invention has the following advantages that
1) present invention is raw materials used to be not the barium chloride of chemical products when preparing barium ferrite, but passes through this
Barium chloride solution obtained by inventive method is omitted what the prior art must first separate barium element from witherite mineral
The technical process of a series of complex, and directly barium chloride solution is prepared into using natural witherite mineral as primary raw material.Therefore,
Compared with existing factory's mature technology, the present invention not only because of the technical process of a series of complex needed for eliminating " separation ", and
And save the raw materials such as a large amount of adapted acid, alkali, salt, reagent and a large amount of manpower and material resources time cost.
2) present invention prepares barium ferrite using classical chemical coprecipitation, this illustrates the theoretical base for realizing this technique
Plinth and engineering process all have been provided with, it is only necessary to can prepare satisfactory barium iron oxygen using the relatively simple method of technique
Body powder.
For example, can be applied on a large scale in the instrument and equipments such as instrument and meter, electroacoustic motor, magnetic separation magnetization.The present invention
Method has many advantages, such as that theoretical mature, cost is relatively low, simple process, widely applicable, easy to operate.
The present invention makes full use of local low-grade witherite mineral, tool while obtained high added value barium ferrite product
There is good Social benefit and economic benefit.With it is existing prepare barium ferrite technology compared with, the present invention had both remained its magnetic property
The advantages of, and overcome its many deficiency, so that preparation totle drilling cost is lower.
Specific embodiment
Below with reference to embodiment, the invention will be further described, but should not be construed the above-mentioned subject area of the present invention only
It is limited to following embodiments.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and used
With means, various replacements and change are made, should all include within the scope of the present invention.
Embodiment 1:
A method of it is directly that raw material prepares barium ferrite using low-grade witherite, which is characterized in that including following
Step:
1) barium chloride solution is prepared
1.1) witherite after ball milling being sieved is added in hydrochloric acid solution, stirring, wet-leaching；
The weight ratio of the witherite and hydrochloric acid solution is 1 ︰ 1；
The witherite and the w/v (g ︰ mL) of water stated is 1 ︰ 2；
The temperature of the leaching is 30 DEG C, extraction time 1h；
In whipping process in the step 1.1): stirring rate 150r/min, mixing time 1h.
1.2) liquid after leaching obtained in step 1.1) is filtered, isolated solid phase and liquid phase will be consolidated
It is mutually washed, the liquid after collecting washing；
1.3) after mixing the liquid after liquid phase and washing after separating obtained in step 1.2), mixture A is obtained；It will
After liquor ferri trichloridi is added in mixture A, under the action of magnetic heating stirrer, 70 DEG C of reaction temperature, adjust while stirring
PH to 8 is saved, coprecipitation reaction, reaction time 2h are carried out；
The proportion of the mixture A and ferric trichloride presses barium ferrite (BaFe12O19) chemical formula determines；
The adjusting pH process: it is first adjusted using excessive Carbon Dioxide sodium solution (1.5 times of metal ion mol times)；
It is adjusted again with the NaOH solution of 6mol/L to required pH, the purpose for the arrangement is that barium ions is made to firstly generate barium carbonate sediment,
In subsequent high-temperature burning process, it is more conducive to be converted into barium monoxide and iron oxide further generates barium ferrite crystal, meanwhile, also
It can save and directly adjust a large amount of NaOH reagents, save the cost consumed by pH with NaOH solution.
2) barium ferrite powder is prepared
2.1) mixture after progress coprecipitation reaction in step 1.3) is filtered, obtains filtrate and filter cake, used
Distilled water is by Washing of Filter Cake to neutrality, then filter cake is placed in drying box and is dried, and obtains barium ferrite precursor powder；
The drying time is 1h, and the drying temperature is 60 DEG C；
2.2) barium ferrite precursor powder obtained in step 2.1) is placed in temperature programming Muffle furnace and is calcined,
Obtain barium ferrite product；
The calcination temperature is 700 DEG C；Calcination time is 1h.
Barium ferrite product obtained in the present embodiment is measured: experiment is using national standard " barium in celestite ore
The measurement of content-barium chromate volumetric method " content of barium in (GB9018.2-1988) measurement experiment, using EDTA volumetric determination
The content of strontium and calcium in leachate, using the content of the molten middle iron ion of spectrophotometric determination o-phenanthroline leachate.Meanwhile
Obtained barium ferrite powder is tested for the property, to illustrate its characteristic performance with magnetic material, it was demonstrated that obtain
Barium ferrite material belongs to permanent-magnet material, is to be detected by 7410 vibrating specimen magnetometer of Lake Shore, to obtain it
Magnetic parameter.
Measurement result are as follows: the saturation magnetization of barium ferrite product obtained is 25emu/g, coercivity in the present embodiment
For 3180Oe.
Embodiment 2:
A method of it is directly that raw material prepares barium ferrite using low-grade witherite, which is characterized in that including following
Step:
1) barium chloride solution is prepared
1.1) witherite after ball milling being sieved is added in hydrochloric acid solution, stirring, wet-leaching；
The weight ratio of the witherite and hydrochloric acid solution is 1 ︰ 2；
The witherite and the w/v (g ︰ mL) of water stated is 1 ︰ 4；
The temperature of the leaching is 50 DEG C, extraction time 2h；
In whipping process in the step 1.1): stirring rate 200r/min, mixing time 2h.
1.2) liquid after leaching obtained in step 1.1) is filtered, isolated solid phase and liquid phase will be consolidated
It is mutually washed, the liquid after collecting washing；
1.3) after mixing the liquid after liquid phase and washing after separating obtained in step 1.2), mixture A is obtained；It will
After liquor ferri trichloridi is added in mixture A, under the action of magnetic heating stirrer, 70 DEG C of reaction temperature, adjust while stirring
PH to 9 is saved, coprecipitation reaction, reaction time 2h are carried out；
The proportion of the mixture A and ferric trichloride presses barium ferrite (BaFe12O19) chemical formula determines；
The adjusting pH process: it is first adjusted using excessive Carbon Dioxide sodium solution (1.5 times of metal ion mol times)；
It is adjusted again with the NaOH solution of 6mol/L to required pH, the purpose for the arrangement is that barium ions is made to firstly generate barium carbonate sediment,
In subsequent high-temperature burning process, it is more conducive to be converted into barium monoxide and iron oxide further generates barium ferrite crystal, meanwhile, also
It can save and directly adjust a large amount of NaOH reagents, save the cost consumed by pH with NaOH solution.
2) barium ferrite powder is prepared
2.1) mixture after progress coprecipitation reaction in step 1.3) is filtered, obtains filtrate and filter cake, used
Distilled water is by Washing of Filter Cake to neutrality, then filter cake is placed in drying box and is dried, and obtains barium ferrite precursor powder；
The drying time is 2h, and the drying temperature is 70 DEG C；
2.2) barium ferrite precursor powder obtained in step 2.1) is placed in temperature programming Muffle furnace and is calcined,
Obtain barium ferrite product；
The calcination temperature is 900 DEG C；Calcination time is 2h.
Barium ferrite product obtained in the present embodiment is measured: experiment is using national standard " barium in celestite ore
The measurement of content-barium chromate volumetric method " content of barium in (GB9018.2-1988) measurement experiment, using EDTA volumetric determination
The content of strontium and calcium in leachate, using the content of the molten middle iron ion of spectrophotometric determination o-phenanthroline leachate.Meanwhile
Obtained barium ferrite powder is tested for the property, to illustrate its characteristic performance with magnetic material, it was demonstrated that obtain
Barium ferrite material belongs to permanent-magnet material, is to be detected by 7410 vibrating specimen magnetometer of Lake Shore, to obtain it
Magnetic parameter.
Measurement result are as follows: the saturation magnetization of barium ferrite product obtained is 40.5emu/g, coercive in the present embodiment
Power is 4500Oe.
Embodiment 3:
A method of it is directly that raw material prepares barium ferrite using low-grade witherite, which is characterized in that including following
Step:
1) barium chloride solution is prepared
1.1) witherite after ball milling being sieved is added in hydrochloric acid solution, stirring, wet-leaching；
The weight ratio of the witherite and hydrochloric acid solution is 1 ︰ 3；
The witherite and the w/v (g ︰ mL) of water stated is 1 ︰ 6；
The temperature of the leaching is 70 DEG C, extraction time 3h；
In whipping process in the step 1.1): stirring rate 250r/min, mixing time 3h.
1.2) liquid after leaching obtained in step 1.1) is filtered, isolated solid phase and liquid phase will be consolidated
It is mutually washed, the liquid after collecting washing；
1.3) after mixing the liquid after liquid phase and washing after separating obtained in step 1.2), mixture A is obtained；It will
After liquor ferri trichloridi is added in mixture A, under the action of magnetic heating stirrer, 70 DEG C of reaction temperature, adjust while stirring
PH to 10 is saved, coprecipitation reaction, reaction time 2h are carried out；
The proportion of the mixture A and ferric trichloride presses barium ferrite (BaFe12O19) chemical formula determines；
The adjusting pH process: it is first adjusted using excessive Carbon Dioxide sodium solution (1.5 times of metal ion mol times)；
It is adjusted again with the NaOH solution of 6mol/L to required pH, the purpose for the arrangement is that barium ions is made to firstly generate barium carbonate sediment,
In subsequent high-temperature burning process, it is more conducive to be converted into barium monoxide and iron oxide further generates barium ferrite crystal, meanwhile, also
It can save and directly adjust a large amount of NaOH reagents, save the cost consumed by pH with NaOH solution.
2) barium ferrite powder is prepared
2.1) mixture after progress coprecipitation reaction in step 1.3) is filtered, obtains filtrate and filter cake, used
Distilled water is by Washing of Filter Cake to neutrality, then filter cake is placed in drying box and is dried, and obtains barium ferrite precursor powder；
The drying time is 3h, and the drying temperature is 80 DEG C；
2.2) barium ferrite precursor powder obtained in step 2.1) is placed in temperature programming Muffle furnace and is calcined,
Obtain barium ferrite product；
The calcination temperature is 1100 DEG C；Calcination time is 3h.
Barium ferrite product obtained in the present embodiment is measured: experiment is using national standard " barium in celestite ore
The measurement of content-barium chromate volumetric method " content of barium in (GB9018.2-1988) measurement experiment, using EDTA volumetric determination
The content of strontium and calcium in leachate, using the content of the molten middle iron ion of spectrophotometric determination o-phenanthroline leachate.Meanwhile
Obtained barium ferrite powder is tested for the property, to illustrate its characteristic performance with magnetic material, it was demonstrated that obtain
Barium ferrite material belongs to permanent-magnet material, is to be detected by 7410 vibrating specimen magnetometer of Lake Shore, to obtain it
Magnetic parameter.
Measurement result are as follows: the saturation magnetization of barium ferrite product obtained is 39.6emu/g, coercive in the present embodiment
Power is 1033Oe.
Embodiment 4:
A method of it is directly that raw material prepares barium ferrite using low-grade witherite, which is characterized in that including following
Step:
1) barium chloride solution is prepared
1.1) witherite after ball milling being sieved is added in hydrochloric acid solution, stirring, wet-leaching；
The weight ratio of the witherite and hydrochloric acid solution is 1 ︰ 4；
The witherite and the w/v (g ︰ mL) of water stated is 1 ︰ 7；
The temperature of the leaching is 80 DEG C, extraction time 4h；
In whipping process in the step 1.1): stirring rate 300r/min, mixing time 4h.
1.2) liquid after leaching obtained in step 1.1) is filtered, isolated solid phase and liquid phase will be consolidated
It is mutually washed, the liquid after collecting washing；
1.3) after mixing the liquid after liquid phase and washing after separating obtained in step 1.2), mixture A is obtained；It will
After liquor ferri trichloridi is added in mixture A, under the action of magnetic heating stirrer, 70 DEG C of reaction temperature, adjust while stirring
PH to 11 is saved, coprecipitation reaction, reaction time 2h are carried out；
The proportion of the mixture A and ferric trichloride presses barium ferrite (BaFe12O19) chemical formula determines；
The adjusting pH process: it is first adjusted using excessive Carbon Dioxide sodium solution (1.5 times of metal ion mol times)；
It is adjusted again with the NaOH solution of 6mol/L to required pH, the purpose for the arrangement is that barium ions is made to firstly generate barium carbonate sediment,
In subsequent high-temperature burning process, it is more conducive to be converted into barium monoxide and iron oxide further generates barium ferrite crystal, meanwhile, also
It can save and directly adjust a large amount of NaOH reagents, save the cost consumed by pH with NaOH solution.
2) barium ferrite powder is prepared
2.1) mixture after progress coprecipitation reaction in step 1.3) is filtered, obtains filtrate and filter cake, used
Distilled water is by Washing of Filter Cake to neutrality, then filter cake is placed in drying box and is dried, and obtains barium ferrite precursor powder；
The drying time is 4h, and the drying temperature is 90 DEG C；
2.2) barium ferrite precursor powder obtained in step 2.1) is placed in temperature programming Muffle furnace and is calcined,
Obtain barium ferrite product；
The calcination temperature is 1200 DEG C；Calcination time is 4h.
Barium ferrite product obtained in the present embodiment is measured: experiment is using national standard " barium in celestite ore
The measurement of content-barium chromate volumetric method " content of barium in (GB9018.2-1988) measurement experiment, using EDTA volumetric determination
The content of strontium and calcium in leachate, using the content of the molten middle iron ion of spectrophotometric determination o-phenanthroline leachate.Meanwhile
Obtained barium ferrite powder is tested for the property, to illustrate its characteristic performance with magnetic material, it was demonstrated that obtain
Barium ferrite material belongs to permanent-magnet material, is to be detected by 7410 vibrating specimen magnetometer of Lake Shore, to obtain it
Magnetic parameter.
Measurement result are as follows: the saturation magnetization of barium ferrite product obtained is 35.5emu/g, coercive in the present embodiment
Power is 3880Oe.
Embodiment 5:
A method of it is directly that raw material prepares barium ferrite using low-grade witherite, which is characterized in that including following
Step:
1) barium chloride solution is prepared
1.1) witherite after ball milling being sieved is added in hydrochloric acid solution, stirring, wet-leaching；
The weight ratio of the witherite and hydrochloric acid solution is 1 ︰ 5；
The witherite and the w/v (g ︰ mL) of water stated is 1 ︰ 9；
The temperature of the leaching is 90 DEG C, extraction time 6h；
In whipping process in the step 1.1): stirring rate 350r/min, mixing time 5h.
1.2) liquid after leaching obtained in step 1.1) is filtered, isolated solid phase and liquid phase will be consolidated
It is mutually washed, the liquid after collecting washing；
1.3) after mixing the liquid after liquid phase and washing after separating obtained in step 1.2), mixture A is obtained；It will
After liquor ferri trichloridi is added in mixture A, under the action of magnetic heating stirrer, 70 DEG C of reaction temperature, adjust while stirring
PH to 12 is saved, coprecipitation reaction, reaction time 2h are carried out；
The proportion of the mixture A and ferric trichloride presses barium ferrite (BaFe12O19) chemical formula determines；
The adjusting pH process: it is first adjusted using excessive Carbon Dioxide sodium solution (1.5 times of metal ion mol times)；
It is adjusted again with the NaOH solution of 6mol/L to required pH, the purpose for the arrangement is that barium ions is made to firstly generate barium carbonate sediment,
In subsequent high-temperature burning process, it is more conducive to be converted into barium monoxide and iron oxide further generates barium ferrite crystal, meanwhile, also
It can save and directly adjust a large amount of NaOH reagents, save the cost consumed by pH with NaOH solution.
2) barium ferrite powder is prepared
2.1) mixture after progress coprecipitation reaction in step 1.3) is filtered, obtains filtrate and filter cake, used
Distilled water is by Washing of Filter Cake to neutrality, then filter cake is placed in drying box and is dried, and obtains barium ferrite precursor powder；
The drying time is 5h, and the drying temperature is 100 DEG C；
2.2) barium ferrite precursor powder obtained in step 2.1) is placed in temperature programming Muffle furnace and is calcined,
Obtain barium ferrite product；
The calcination temperature is 1400 DEG C；Calcination time is 6h.
Barium ferrite product obtained in the present embodiment is measured: experiment is using national standard " barium in celestite ore
The measurement of content-barium chromate volumetric method " content of barium in (GB9018.2-1988) measurement experiment, using EDTA volumetric determination
The content of strontium and calcium in leachate, using the content of the molten middle iron ion of spectrophotometric determination o-phenanthroline leachate.Meanwhile
Obtained barium ferrite powder is tested for the property, to illustrate its characteristic performance with magnetic material, it was demonstrated that obtain
Barium ferrite material belongs to permanent-magnet material, is to be detected by 7410 vibrating specimen magnetometer of Lake Shore, to obtain it
Magnetic parameter.
Measurement result are as follows: the saturation magnetization of barium ferrite product obtained is 36.8emu/g, coercive in the present embodiment
Power is 3690Oe.
From the various embodiments described above as can be seen that barium ferrite powder obtained by the present invention to meet permanent-magnet ferrite height full
With the intensity of magnetization (Ms), the feature of high-coercive force (Hc), and the maximum saturation intensity of magnetization (MS) are 40.5emu/g, maximum coercive
Power (HC) is M.M.Rashad pure material FeCl under 4500Oe, with equal conditions3、BaCl2The BaFe of preparation12O19Magnetic property
(MS=61.8emu/g, HC=3646Oe) comparison, coercivity have advantage, and saturation magnetization is to be improved.
Claims (2)
1. a kind of method for directly preparing barium ferrite using low-grade witherite for raw material, which is characterized in that including following step
It is rapid:
1) barium chloride solution is prepared
1.1) witherite after ball milling being sieved is added in hydrochloric acid solution, stirring, wet-leaching；
The weight ratio of the witherite and hydrochloric acid solution is 1 ︰, 1~1 ︰ 5；
The witherite and the w/v (g ︰ mL) of water stated is 1 ︰, 2~1 ︰ 9；
The temperature of the leaching is 30~90 DEG C, and extraction time is 1~6h；
1.2) by obtained in step 1.1) leach after liquid filter, isolated solid phase and liquid phase, by solid phase into
Row washing, the liquid after collecting washing；
1.3) after mixing the liquid after liquid phase and washing after separating obtained in step 1.2), mixture A is obtained；
The mixed solution of natrium carbonicum calcinatum and sodium hydroxide is added in mixture A, after pH value adjustment to 8~12, carries out coprecipitated
It forms sediment and reacts；
The molar ratio of metal ion total amount and natrium carbonicum calcinatum in the mixture A is 1 ︰ 1.5；
2) barium ferrite powder is prepared
2.1) mixture after progress coprecipitation reaction in step 1.3) is filtered, obtains filtrate and filter cake, uses distillation
Water is by Washing of Filter Cake to neutrality, then filter cake is placed in drying box and is dried, and obtains barium ferrite precursor powder；
The drying time is 1~5h, and the drying temperature is 60 DEG C~100 DEG C；
2.2) barium ferrite precursor powder obtained in step 2.1) is placed in temperature programming Muffle furnace and is calcined, obtained
Barium ferrite product；
The calcination temperature is 700 DEG C~1400 DEG C；Calcination time is 1h~6h.
2. a kind of method for directly preparing barium ferrite using low-grade witherite for raw material according to claim 1,
Be characterized in that: in the whipping process in the step 1.1): stirring rate is 150~350r/min, and mixing time is 1~5h.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111762817A (en) * | 2020-04-24 | 2020-10-13 | 重庆大学 | Method for preparing strontium barium ferrite from strontium slag |
| CN114735754A (en) * | 2022-05-24 | 2022-07-12 | 沈阳理工大学 | Barium ferrite and preparation method thereof |
| CN115772032A (en) * | 2022-12-14 | 2023-03-10 | 宁波合荣磁业有限公司 | Preparation method of permanent magnetic ferrite material for calendering |
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| CN114735754B (en) * | 2022-05-24 | 2023-06-16 | 沈阳理工大学 | Barium ferrite and preparation method thereof |
| CN115772032A (en) * | 2022-12-14 | 2023-03-10 | 宁波合荣磁业有限公司 | Preparation method of permanent magnetic ferrite material for calendering |
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