CN1054459C - Method for producing composite oxides for use as starting materials for ferrities - Google Patents
Method for producing composite oxides for use as starting materials for ferrities Download PDFInfo
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- CN1054459C CN1054459C CN90110337A CN90110337A CN1054459C CN 1054459 C CN1054459 C CN 1054459C CN 90110337 A CN90110337 A CN 90110337A CN 90110337 A CN90110337 A CN 90110337A CN 1054459 C CN1054459 C CN 1054459C
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Abstract
The present invention relates to a production method of oxides for starting materials of soft ferrities. The oxides mainly contain ferrum, zinc, and at least one kind of metal from manganese, magnesium, nickel and copper. When other metal chlorides except zinc are roasted and oxidized, when composite oxides are formed, the zinc oxides are added in the roasting process. The obtained oxides used for ferrites contain metal with the required proportion and spinel ferrites, and the spinel ferrites and the uniformly dispersed zinc oxides form intermediate products. The adoption of the starting oxides can omit the roasting process and the powder mixing process in the production process of the ferrites. High-quality ferrites can be obtained by direct sintering, and after the zinc chlorides replace the zinc oxides, the same starting oxides of ferrites can be also produced.
Description
The present invention relates to ferritic production method, more particularly the present invention relates to the improvement as the generation method of the composite oxides of high-quality starting materials for ferrites, the chloride or the oxide that wherein will constitute those metals of soft magnetic ferrite are used as raw material.
Generally, ferritic industrialized preparing process comprises by the predetermined molar ratio mixing cpd, as metal oxide or metal carbonate, these metals such as iron, manganese, magnesium, nickel, copper, zinc and other are used to constitute ferritic analog, this mixture is calcined (pre-burning), grinding, last sintering is at high temperature carried out in granulation and molded and shaped.Yet, this method has individual problem, need calcining step exactly, and in this step the quite high time of temperature also longer, this calcining step is influential to product quality, as in production process, having introduced impurity, the quality inhomogeneities on the microcosmic, and production time that need be long and big energy.
Generally, as the original iron oxide of ferrite composition major part, in most cases be in a spray baking furnace, to make through the high-temperature roasting oxidation by the hydrochloric acid pickling waste liquor that will produce in hot rolled steel plate or steel coil strip (coils) technology.
After mixing, when calcining or sintering, these metal oxides are heat-treated, react, form mutually as ZnFe by intermediate product
2O
4, ZnMn
2O
4, MnFe
2O
4Or final formation of analog has the single-phase of spinel structure.
In above-mentioned ferrite production step, by mixing corresponding oxide is evenly disperseed, this problem has great influence to the magnetic characteristic of final ferrite product.Therefore, people are expecting a kind of improving one's methods of economic implications that have always.
Phase transformation during about sintering, intermediate product forms mutually as ZnFe
2O
4And MnFe
2O
4Volumetric expansion in their forming processes is respectively 1.5～2% and 0.3～0.5%.So, if the cancellation calcination step passes to compression molded by expansion with the pulsating stress that after-contraction causes in sintering process, its result, the sintered density of final sintered products is lower, and defectiveness is as distortion and cracking, and causes the size accuracy relatively poor and intensity is lower.
In the prior art, as producing ferritic improving one's methods, someone has proposed a kind of method, and the mixed solution that will constitute ferritic metal chloride in the method is used as raw material and carries out roasting oxidation (Japanese patent application publication No. 47-11550 and EP-A-277245).Yet, when whole raw material all adopt metal chloride, therefore metal chloride such as zinc chloride with higher vapor pressure are gasified in roasting process, exist this problem, have no idea to make the metal the product that obtains at the bottom of the baking furnace to reach predetermined concentration exactly.
Exempt from this phenomenon, Japanese patent application publication No. 63-17776 has proposed a kind of method, comprising, in constituting ferritic metal, only press lower metal to provide chloride vapor with the form of chloride mixed solution.This mixed solution roasting oxidation is obtained the composite oxides of mixed oxide and/or partial reaction.Oxide that will obtain thus and chloride vapor are pressed higher metal oxide mechanical mixture then.With this mixture direct sintering, need not calcining, just can obtain ferrite.In this technology,, in step afterwards, must be that the zinc oxide of 0.1-1 μ m carries out mechanical mixture to granularity as for the Zn component.This practice has caused the inhomogeneities of constituents of a mixture, thereby the magnetic characteristic that causes final products descends.This method is than using corresponding oxide as raw-material method tangible improvement to be arranged, and still aspect even dispersion, this improvement is also unsatisfactory.
As mentioned above, known being used as in the production method of the raw-material composite oxides of soft magnetic ferrite, the metal chloride with high vapour pressure, as the chloride of Zn, can not be in the high-temperature roasting step simultaneously with other metal chloride roasting.After the roasting, also need an additional mechanical mixture step, so just evenly disperse or the impurity introducing aspect stayed need further improved problem.
The object of the present invention is to provide a kind of direct sintering to be used for soft ferrite such as Fe-(Mn, Mg, Ni)-ferritic raw-material production method of Zn, wherein in same baking furnace, simultaneously the major metal element that constitutes soft ferrite is carried out roasting, collect Powdered composite oxides from furnace bottom, and cancelled needed calcining and powder subsequent step in the ordinary student production. art.
Another object of the present invention is to provide a kind of method, and this method has been guaranteed the even dispersion of zinc, and the characteristic of the ferrite product of formation such as ferrite core body such as magnetic characteristic and electrical characteristics are improved.
Another object of the present invention is to provide a kind of production method of ferrite product, wherein produce intermediate product phase (as what in calcining and sintering step, produced usually) in advance, like this in the sintering process of calcining, suppressed owing to form the mutually caused volumetric expansion of intermediate product, the result finally obtained a kind of high density, size accuracy height, without any the ferrite product of distortion or cracking.
Further purpose of the present invention is to provide a kind of method, wherein produces the powder composite oxides as the high-quality starting materials for ferrites cost-effectively.
To achieve these goals, the inventor has carried out deep research to production method, to produce composite oxides cost-effectively as starting materials for ferrites, found that and to address these problems, promptly in the volatilization problem of the high vapour pressure composition of roasting when (, comprising zinc chloride) and non-uniformity problem and the uneconomical problem that causes during the mechanical mixture additive as metal chloride.The present invention is based on that above-mentioned discovery finishes.
More particularly, the invention provides a kind of production method as the raw-material oxide of soft magnetic ferrite, this oxide comprises iron, the zinc of the main component of conduct and is selected from the oxide of at least a metal of manganese, magnesium, nickel and copper, this method comprises a kind of mixed chloride aqueous solution of feeding in stove, and this mixed chloride is made up of iron chloride and at least a chloride that is selected from the metal of manganese, magnesium, nickel and copper; Under hot conditions, this aqueous solution is carried out roasting oxidation, obtain a kind of iron and at least a composite oxides that are selected from the metal in manganese, magnesium, nickel and the copper; Forming or composite oxides have roasting heat at composite oxides, when its temperature is not less than 400 ℃, add zinc oxide and/or easily change into the zinc compound of zinc oxide under this temperature, the result makes a kind of as the raw-material oxide of soft magnetic ferrite by means of the effect of roasting heat.
In this case, the zinc oxide of adding or at least a compound (as carbonate or hydroxide) that easily changes into zinc oxide preferably powder or slip and near the feeding aqueous solution position join in the baking furnace.
In addition, behind aqueous solution roasting oxidation with iron chloride and at least a muriatic mixture that is selected from manganese chloride, magnesium chloride, nickel chloride and copper chloride, can be when after calcination process, carrying out the dry method dechlorination and handling with zinc oxide and/or the zinc compound that easily changes into zinc oxide be added in the formed oxide.
The another kind of selection is that iron chloride and at least a pH that is selected from the muriatic mixed aqueous solution of manganese chloride, magnesium chloride, nickel chloride and copper chloride are transferred to 0.2-7.0.Then with zinc oxide and/or the zinc compound that easily changes into zinc oxide be dispersed in the mixed solution and roasting oxidation.Also have a kind of selection to be, when the modulated mixed solution to 0.2-7.0 of pH value is carried out roasting oxidation, can with zinc compound such as zinc oxide when metal oxide forms with and temperature be not less than 400 ℃ position and add.
Also has another selection, to containing iron chloride and at least a mixed chloride aqueous solution that is selected from manganese chloride, magnesium chloride, nickel chloride and copper chloride carries out roasting oxidation, subsequently can be in the process that metal oxide is forming or have roasting heat and temperature at the metal oxide that forms and be not less than 400 ℃ but be not higher than under 900 ℃ the condition and add with zinc chloride.
In this case, the mode by feeding zinc chloride powder or spray solder(ing)acid adds zinc chloride.
In addition, be added in the metal oxide that is generated in the dry method chlorination processing procedure that zinc chloride can be carried out after calcination process.
By this method, can suitably add the high zinc chloride of vapour pressure.
Figure 1 shows that the flow chart of a concrete scheme of the present invention.
Figure 2 shows that the graphic representation that concerns between remaining chlorine dose and the temperature.
Figure 3 shows that the graphic representation of pH with the changes in solubility of zinc oxide in acid solution.
Figure 4 shows that flow chart according to the production technology of the ferritic initial composite oxides of Mn-Zn of the present invention.
Fig. 5 and the schematic diagram that is respectively the oxidizing roasting stove of embodiment of the invention soft magnetic ferrite initial oxidation thing shown in Figure 6, and as a comparison.
Fig. 7 and the cut-away view that is respectively according to the production technology of the soft magnet hydrogen body initial oxidation thing of embodiments of the invention shown in Figure 8.
Fig. 9 and the flow chart that is respectively soft ferrite prior art production technology shown in Figure 10.
Generally, the extensive soft magnetic ferrite of giving birth to of most industryization all is the Fe by about 70wt%2O
3, 15～30wt% M2The ZnO of-O (wherein M represents Mn, Mg, Ni or analog) and 0～15wt% forms. Wherein, when zinc used with chloride form, zinc had higher vapour pressure. When zinc chloride and other metal when same temperature sprays roasting, a large amount of zinc chloride is drained from furnace roof, the zinc amount the oxide of collecting from furnace bottom is but quite low.
As shown in Figure 9, in the ferritic traditional processing technology of Mn-Zn, be that iron oxide, manganese oxide and zinc oxide are mixed by predetermined molar ratio, at 800-1000 ℃ of lower calcining, grinding, granulation, shaping and sintering. In this method, the uniformity coefficient of mixing is not enough satisfactory, and the magnetic characteristic of final products is also not so good. In addition, since essential through 800-1000 ℃ of calcining, therefore cause production cost higher, and can when grinding, sneak into impurity. Figure 10 is a kind of improvement of said method, wherein adopts iron chloride and manganese chloride as the parent material of roasting. Yet therefore zinc chloride in fact also needs a step of sneaking into zinc oxide, so still there is the heterogeneity problem not by the while roasting oxidation.
In practice of the present invention, method of roasting is characterised in that at least a form with powder or slip in zinc oxide, zinc carbonate and the zinc hydroxide is joined in the reaction zone that Fe and other metal such as Mn, Mg, Ni and Cu are converted to oxide or spinelle in this reaction zone. In particular, at least a in zinc oxide, zinc carbonate and the zinc hydroxide is added to position (1) with powder or slip form, begin to be converted to oxide or ferrospinel at this position Fe and other metal, perhaps be added to position (2), be converted to oxide or ferrospinel at this position Fe and other metal.
According to particular flow sheet above-mentioned process is described.
Fig. 1 is for producing the process chart of the ferritic initial composite oxides of Fe-Mn-Zn (typical soft ferrite material).
The raw material of roasting after a kind of ferric chloride in aqueous solution is used as and mixes, this solution is to be made by the hydrochloric acid pickling waste liquor that produces in steel plate or steel coil strip (coil) hot rolling technology. On the other hand, the manganese chloride aqueous solution is made by manganese raw material such as manganeisen or manganese oxide ash directly are dissolved in hydrochloric acid or the ferric chloride in aqueous solution. With commonsense method Fe-Mn chloride mixed aqueous solution 2 is injected in the spray roaster 1, is being not less than roasting oxidation under 400 ℃ the hot conditions.
The raw-material adding mode of zinc is that with needed zinc amount in the ferrite composition, with zinc oxide, at least a form in zinc carbonate and the zinc hydroxide adds. These zinc raw material 3 both can add by spraying method that (wherein slip injects from shower, can add by blowing method also that (wherein the Zinc material powder is with the Compressed Gas carrier,,, be blown into by a nozzle such as 10 to 12 than (weight) by suitable consolidating-gas).
Can be with position of at least a feeding in zinc oxide, zinc carbonate and the zinc hydroxide, be converted to corresponding oxide (namely such as position identical with the manganese chloride position with the feeding iron chloride shown in the scheme 2 among Fig. 1) at this position iron chloride and manganese chloride, perhaps feed the another location, be converted to corresponding oxide or ferrospinel (that is, the feeding position of the ratio iron chloride shown in Fig. 1 scheme 1 and manganese chloride is more near the position of roasting apparatus outlet) at this position iron chloride and manganese chloride. Atmosphere temperature should be 400-800 ℃. At least a and the Mn of the zinc oxide, zinc carbonate and the zinc hydroxide that add and Fe (this Mn and Fe are oxides or are forming in the process that spinelle reacts) evenly mixed and be transformed into solid solution. Thereby effectively production product (a kind of single-phase intermediate product of spinelle that forms) is such as ZnFe2O
4Or ZnMn2O
4 Should be noted that some metallic oxide fine powder end with the top discharge of the gas that decomposes from roaster, and collected and send back to stove 1 by cyclone separator 4.
Zinc oxide or similar material should be added in the stove in the position that is not less than 400 ℃ temperature. Determine that it is that this temperature is to carry out oxidizing process or forming the Mn of spinelle reaction and the homogenous solid solution of Fe and the zinc oxide that adds or similar material also produces product such as ZnFe effectively that temperature is not less than 400 ℃ reason2O
4Or ZnMn2O
4Necessary. Adopt common roaster, preferred upper limit furnace temperature is about 900 ℃, and the present invention is not crucial to be considered and do like this from economic aspect although this is to implementing.
The additive 7 that adds trace in the composite oxide power 5 that generates, directly carry out then molded and shaped and after molded and shaped in sintering furnace 6 high temperature sintering, obtain a kind of ferrite core product 8 of sintering, this product has good magnetic characteristics, the size accuracy is good and without any the distortion and the cracking. As mentioned above, in list-Fe-Mn-Zn roasting technique, evenly mixing-oxidation-synthetic spinel reaction becomes possibility. Therefore, can cancel the raw-material mechanical mixture step of zinc and the calcining process that common needs carry out. Thereby make the soft ferrite product that makes have fabulous magnetic characteristic and size accuracy.
Dechlorination is described below and promotes the synthetic spinel of initial oxidation thing to react. Frerrous chloride and the manganous chloride aqueous solution are mixed by predetermined molar ratio, at 800 ℃ this mixture is sprayed roasting then. The complex oxide that forms consist of Fe2O
3∶Mn
2O
3=75.3: 24.7 (wt%), remaining chlorinity is 0.30%. With the heating 40 minutes in 200-1000 ℃, air stream of this mixed oxide. The variation of its remaining chlorine dose is shown in Fig. 2.
Be no more than 0.20wt% for remaining chlorine dose is dropped to, the lower limit heat treatment temperature should be 300 ℃. On the other hand, if surpass 1000 ℃ excessive powder sintered also be bad, and expensive time in the powder process step below.
What will describe below is some experimental results, and this experiment is carried out with modified processing route, i.e. the aqueous chloride solution of mixed oxidization zinc and metal such as iron, manganese, nickel, magnesium and analog, and then simultaneously these compositions are carried out roasting.
To guarantee that (guarantee) hydrochloric acid reagent is dissolved in 80 ℃ the pure hot water, makes the aqueous hydrochloric acid solution with following pH value.
Sample 1:pH=～0
Sample 2:pH=0.1
Sample 3:pH=0.2
Sample 4:pH=0.4
Sample 5:pH=1.0
Sample 6:pH=2.0
In 1 liter of various solution, (remain on 80 ℃) and add 400g and guarantee zinc oxide (ZnO) and stir, filter then, and change the zinc oxide amount of in corresponding pH value solution, dissolving by remaining zinc oxide quantitative determination according to acidity with blender.
It the results are shown in Fig. 3, and this result shows that the zinc oxide amount of dissolving obviously reduces when the pH value surpassed for 0.2 (comprising 0.2) in acid solution.More particularly, when the pH value is not less than 0.2, find that the zinc oxide amount of dissolving is not more than 5 grams per liters.Therefore, the pH value of chloride solution is transferred to is not less than 0.2, just the chloride solution that might significantly not be dissolved in the chloride solution having sneaked into zinc oxide carries out roasting oxidation.
About the upper limit of pH value, when pH greater than 7.0 the time, metal ion forms hydroxide and precipitation.Therefore, the pH value preferably is not more than 7.0.
What will describe below is after finishing the muriatic oxidation reaction of ferrite component, is adding zinc oxide in the oxidizing roasting stove or when ensuing dry method dechlorination is handled or is easily changing into the zinc compound process of corresponding oxide.
This process by a kind of ferric chloride in aqueous solution of independent roasting oxidation to produce ferritic initial oxidation iron, this iron oxide is ferritic a kind of main component, perhaps produces ferriferous oxide and is selected from least a hopcalite in the oxide of manganese, magnesium, nickel and copper.Initial chloride can be the chloride of single Fe or the muriatic mixture of Fe and other element (except Zn).In 650-900 ℃ stove, carry out roasting oxidation by spraying this chloride solution.This chloride is heated in stove and changes into corresponding oxide.Preferably with zinc oxide and/or the zinc compound that is easy to change into corresponding oxide be blown into, the oxide requirement partly that its amount obtains after finishing conversion reaction for made ferrite composition, the formation speed of its speed and oxide adapts.
According to this technology, the ZnO that is added disappears in 500-800 ℃ following reaction, and by the waste heat effect of oxidation and roasting reaction, or the heat that adds to the initial oxidation thing carries out dechlorination and handles.Said reaction is:
By this reaction, can alleviate or get rid of the undesirable expansion that causes by above-mentioned reaction fully in the step below.In addition, the zinc compound that this processing has caused zinc oxide or has been easy to change into corresponding oxide mixes with the preliminary of other oxide, thereby has guaranteed the even dispersion of oxide component.
Calcined oxide generally contains the residual chlorine of the 0.1-0.4% that has an appointment, and this residual chlorine has adverse effect to ferritic production.Therefore, in order to reduce the content of residual chlorine, at a certain temperature this oxide be heated or wash with water.The heating dechlorination is handled and can for example be passed through, and a rotary kiln is connected on the oxidizing roasting stove finishes the waste heat in the time of can effectively utilizing the oxidizing roasting oxide like this.The zinc compound of in this case, can be with zinc oxide or easily changing into zinc oxide is blown into the intake section of rotary kiln.
So just can produce the oxide of the ferrite formation element except that Zn, add zinc oxide or a kind of zinc compound that easily changes into corresponding oxide simultaneously, thereby once obtain it by the required oxide of forming.From the baking furnace or the oxide powder of discharging from following dry method dechlorination equipment, ZnO changes into ZnFe
2O
4Phase, thus ZnO come down to non-existent, so any expansion can not take place in sintering step.In addition, under general case, can cancel blend step.Under general case, molded and shaped and sintering has just obtained final products with the oxide that produces.According to ferritic kind, can add SiO
2, CaCO
3And analog.In this case, just can not cancel blend step.
In such scheme, the situation that adds zinc oxide and/or easily be transformed into the zinc compound of corresponding oxide has been described.Though the mode that adds zinc oxide and/or easily be transformed into the zinc compound of zinc oxide is not crucial, importantly how just can reach with the initial oxidation thing and evenly mix.For example, can be with carrier band the carrier of compressed air of ZnO be blown into by a nozzle than (as 10-12) with suitable ZnO powder/air (weight); Perhaps ZnO is dispersed in the water and also this dispersion liquid is blown into.In case of necessity after adding trace additives, with the molded and shaped and sintering of ferritic initial oxidation thing of this generation, obtain to have good magnetic characteristics, the size accuracy, without any the sintering core body product of distortion and cracking.Therefore, in the present invention, can cancel necessary mixing of traditional processing technology and calcining step.Both made controlled oxidation thing component or interpolation trace additive subtly, it is very simple that married operation also becomes.
With reference to figure 4 another concrete scheme has been described, wherein with the mixed chloride aqueous solution of iron and other metal such as manganese, magnesium, nickel and copper as raw material.Free hydrochloric acid in the chloride solution is neutralized, and with the powder and/or the hydrous slurry of zinc oxide, joins in the solution after this neutralization and makes a kind of slip.Before Zn and metal such as Fe and the substitution reaction of Ni (its ionization potential is less than Zn) generation metal, the slip that obtains is fed the spray baking furnace immediately, simultaneously roasting oxidation then.
In neutralization chamber 12, pass through in the nertralizer 13 and the Fe and the Mn mixed chloride aqueous solution 11, make it pH and be not less than 0.2, preferably be not less than 0.7.Because pH is lower than at 0.2 o'clock, when joining zinc oxide 15 in the blender 16, a large amount of zinc oxide changes into the corresponding chlorinated thing.In this case, when carrying out roasting in spray baking furnace 18, the zinc chloride that has high vapour pressure in roasting process is evaporated, and therefore causes the zinc amount from the product 21 that collect the baking furnace bottom lower than predetermined concentration.
To neutralize subsequently the back or adjust pH after chloride mixed solution 14 be input in the blender 16, in this blender, add Zinc oxide powder or a kind of hydrous slurry, thereby obtain the zinc oxide slip 17 of the Fe and the Mn mixed chloride aqueous solution.Be fed into preferably a kind of powder of zinc oxide 15 of blender 16, thereby be unlikely to reduce the concentration of the mixed chloride aqueous solution.Certainly, the zinc oxide of feeding can be hydrous slurry.If use hydrous slurry, its concentration preferably should be high as much as possible, so that save the fuel of baking furnace.
The metal that zinc in being suspended in slip is not littler with ionization potential (Fe in the Mn-Fe ferrite) takes place before the metal substitution reaction, the zinc oxide slip 17 of the Fe and the Mn mixed chloride aqueous solution is fed in the spray baking furnace immediately, and roasting oxidation simultaneously.In this case, preferably with this zinc oxide slip 17 in back 30 minutes of mixing, this baking furnace 18 of feeding in preferred 5 minutes.
The zinc oxide slip 17 of the Fe and the Mn mixed chloride aqueous solution is sprayed in the spray sintering furnace 18, and the burning of the fuel 19 by offering baking furnace 18, roasting oxidation under 650-900 ℃ of hot conditions.During roasting oxidation, Fe and Mn and zinc oxide carry out the spinelle reaction, thereby produce a kind of product very uniformly (forming the single-phase intermediate product of spinelle) effectively as ZnFe
2O
4, or ZnMn
2O
4Burnt gas, hydrogen chloride and the steam 20 that is evaporated are discharged from the top of baking furnace 18.
In the composite oxide power 21 of acquisition like this, add trace additives 22, as SiO
2, CaCO
3And analog, mix then, molded and shaped and in sintering furnace 23 direct high temperature sintering, thereby obtain to have good magnetic characteristics, the size accuracy is high and without any the ferrite sintered core body 24 of distortion and cracking.
As mentioned above, the technology of these production powder composite oxides comprises, mixed chlorinated manganese solution and ferric chloride solution (iron is ferritic main component), and this mixture of spray roasting, in and the free hydrochloric acid in Fe and Mn aqueous chloride solution, then, zinc oxide is suspended in the aqueous chloride solution after this neutralization, thereby obtains a kind of slip.Immediately this slip is fed baking furnace and spray roasting in stove, to guarantee that in cancellation needed mechanical mixture of common process method and the raw-material calcining step of zinc the spinelle that only depends on independent calcination steps to finish even mixing, oxidation and Fe-Mn-Zn transforms.Resulting thus soft ferrite has good magnetic characteristic and size accuracy.
Down with the experimental result that will describe based on another concrete scheme.In this scheme, when with iron chloride be selected from manganese chloride, when magnesium chloride, at least a muriatic mixed solution roasting oxidation in nickel chloride and the copper chloride, in the forming process of metal oxide, add zinc chloride.
1500g guarantee reagent iron chloride and 500g guarantee reagent manganese chloride are dissolved in the pure hot water of 80 ℃ of 4000g, subsequently N are being arranged
2Carry out intensive drying in the heating box that passes through (glowbox).This dried powder is heated in a horizontal tubular stove with 600～700 ℃/hour speed, from stove, take out then and in air, cool off.The oxide that forms is carried out the X-ray diffraction analysis, and the result shows and only has Mn
2O
3And Fe
2O
3Take by weighing this oxide of 100g, spray into the aqueous solution that has dissolved 13g assurance zinc chloride in 80 ℃ of pure hot water of 50g in the above, and mix with nozzle.The speed with 600 ℃/hour is heated to 300 ℃, 400 ℃, 500 ℃, 600 ℃, 700 ℃, 800 ℃, 900 ℃ and 950 ℃ with this powder under the air conditions in horizontal tubular stove, from stove, take out subsequently and in air cooling to obtain product.
Respectively corresponding product is carried out the X-ray diffraction qualitative analysis, analysis result is shown in table 1.Table 1 is depicted as the X-ray The qualitative analysis of the product under the different sintering temperatures.At 300 ℃, remain with zinc chloride.Under 400 ℃ or higher temperature, zinc chloride and oxide complete reaction also change into ZnMn
2O
4Or spinelle phase.Table 2 is depicted as Fe, the Mn of the corresponding product under the different sintering temperatures and the chemical analysis results that Zn forms.
Chemical analysis results shown in the table 2 shows that when temperature surpassed 900 ℃, zinc content began to occur deviation.The total amount that analysis result demonstrates Fe, Mn and Zn is 100wt%.From top analysis as can be seen, sintering temperature is preferably 400 ℃ to 900 ℃ after adding chloride.
From these experimental results, we clearly find, when will having the zinc chloride of high vapour pressure and iron oxide and manganese oxide, we mix, and when 400-900 ℃ of roasting temperature, complete and those oxides reactions of zinc chloride, thus acquisition at an easy rate contains the composite oxides of zinc.
Table 1
The qualitative analysis of X-ray
Sintering temperature Fe
2O
3Mn
2O
3ZnCl
2ZnM
2O
4Spinelle
300℃ 0 0 0
400℃ 0 0 0 0
500℃ 0 0 0 0
600℃ 0 0 0 0
800℃ 0 0 0 0
900℃ 0 0 0 0
950℃ 0 0 0 0
0 is indicated as a confirmed phase or heterogeneous.
Table 2
Analysis result (wt%)
Sintering temperature Fe Mn Zn
300℃ 69.0 23.0 8.0
400℃ 69.2 23.0 7.8
500℃ 69.5 23.9 7.6
600℃ 69.8 22.6 7.6
800℃ 69.9 22.8 7.4
900℃ 69.9 22.8 7.3
950℃ 70.7 23.3 6.0
Can obviously find out from above, when vapour pressure is high to the raw material that are difficult to roasting during with the oxide roasting of iron and manganese (or nickel, magnesium or analog), can be with this raw material roasting oxidation, and this material is easy to and the oxide reaction, forms to contain zinc composite oxide.
As mentioned above, the zinc chloride that the vapour pressure that is added is high can be powder or solution.
By embodiment the present invention is described in more detail.Embodiment 1
Respectively a kind of iron raw material (the hydrochloride waste ferrous chloride aqueous solution behind the pickling hot rolled steel plate) and a kind of manganese raw material (hydrochloric acid solution of manganeisen) are filtered and purify, and, prepare a kind of FeCl that contains according to predetermined mixed in molar ratio
2342.7g/l and MnCl
2111.8g/l aqueous chloride solution.With this solution with 3.0m
3/ hour speed feeding spray baking furnace, in the major part of stove, atmosphere temperature is to carry out roasting under 800 ℃ of conditions.Subsequently, be 600 ℃ position (position of scheme 1 among Fig. 1) in temperature, be that the ZnO suspension of 15wt% is with 0.55m by a nozzle with concentration
3/ hour speed spray into.As a result, obtain a kind of oxide powder of mixing from the bottom of stove, it consists of Fe: Mn: Zn=68.2: 21.7: 10.1 (weight base), it is little that it forms deviation.The X-ray diffraction analysis result shows has also found product, as ZnFe except corresponding oxide
2O
2, FeMn
2O
4, MnFe
2O
4And analog.
The CaCO that in the oxide powder that mixes, adds 800ppm
3SiO with 100ppm
2, add pure water dissolving subsequently, make 50% slip and mixed 20 minutes with wet milk.In any calcining step of cancellation, with the dried machine drying of spray, this slip is made particle, moulded section obtains toroidal core sintering under 1300 ℃ the highest sintering temperature, obtains the core body with good electrical magnetic characteristic as shown in table 3.Comparative Examples 1
For relatively, except not joining ZnO in the baking furnace, repeat above-mentioned technology, obtain a kind of Fe/Mn mixed oxide.Subsequently ZnO is joined in this mixed oxide, make it identical with the proportion of composing of embodiment 1 use.Add additive (800ppm CaCO again
3With 100ppm SiO
2), carry out sintering with the wet milk processing and by embodiment 1 method.The electromagnetic property of made core body is shown in table 3.
Table 3
Sintered density initial permeability core body loss (mW/cm
3)
(g/cm
3) (-) (90 ℃) (100KHz, 200mT, 90 ℃) embodiment 1 4.90 5,520 280 Comparative Examples 1 4.78 3,980 440 embodiment 2
With FeCl
2And MnCl
2Solution mixes by predetermined molar ratio, and in the roasting of 850 ℃ of spray quinolines, obtains Fe
2O
3: Mn
2O
3The mixed oxide of=75.1: 24.9 (wt%).After roasting was just finished, the remaining chlorine dose in the mixed oxide was 0.26%.With the powder after the roasting send into the direct-connected rotary kiln of baking furnace in dechlorination, make carrier with compressed air then, ZnO is blown into the kiln porch by a vibrating nozzle.The throughput rate of the mixed oxide of Fe and Mn is about 700Kg/ hour in baking furnace, so correspondingly the ZnO addition is about 60Kg/ hour.The temperature of rotary kiln is 750 ℃, and atmosphere is air.These initial oxidation things were stirred in rotary kiln moving about 40 minutes and dechlorination.
The phase composition of the powder of collecting from the kiln exit is Fe
2O
350%, spinelle phase 38%, Mn
2O38%, ZnMn
2O
44%, do not find any ZnO.Remaining chlorine dose drops to 210ppm.
The CaCO that in this mixed-powder, adds 500ppm then
3SiO with 200ppm
2(by CaO that is contained behind the sintering and SiO
2Calculate), mixed 10 minutes with grinding machine subsequently.In the cancellation calcining step, adopt the dried machine of spray with this mixture drying-granulating, be molded into toroidal core, and at 1320 ℃ of following sintering.Comparative Examples 2
Except not adding the ZnO, make the initial oxidation thing according to the method that embodiment 2 describes.ZnO is joined in this initial oxidation thing with Ca and Si source, and its amount is identical with embodiment 2, repeats the technology of embodiment 2 subsequently, thereby makes a kind of as the core body of usefulness relatively.Its density and magnetic characteristic are shown in table 4.Unusual grain growth has taken place as the sintering core body of usefulness relatively in part, so the core body that has loss surpasses 1000mW/cm
3
Table 4
Density core body loss μ i
(g/cm
3). (mW/cm
3100KHz, 200mT, 90 ℃) (90 ℃) embodiment 2 4.92 340 4350 Comparative Examples 2 4.77 720 3920 embodiment 3
The hydrochloric acid pickling waste liquor of refining and processing steel plate is removed silicon wherein.Then, calculate, with of speed 160 ℃ under the spray roastings of this waste liquid with 750Kg/ hour according to the iron oxide that is produced.By a nozzle, the slip of ZnO is blown into the bottom of baking furnace with the speed of 2.5Kg/ minute ZnO.The oxide that forms is kept dechlorination in about 30 minutes at furnace bottom.The phase composition of this powder is: Fe
2O
354.1%, ZnFe
2O
444.4%, ZnO1.5%.Remaining chlorine dose is 0.09%.
Press Fe
2O
3: MnO: ZnO=52.9: the ratio of 26.7: 20.4 (mole %) is with Mn
3O
4Join in this oxide, then 830 ℃ of calcinings, granulation is done in spray, is molded into toroidal core at last at about 1390 ℃ of sintering.Comparative Examples 3
With ZnO and Mn
3O
4Join the Fe that has identical composition with embodiment 3
2O
3In and mix, under the condition identical, handle subsequently with embodiment 3.The density and the magnetic characteristic of core body are shown in table 5.
Table 5
Density μ iac
(g/cm
3) (100KHz, 20 ℃) embodiment 3 4.95 7200 Comparative Examples 3 4.86 4900 embodiment 4
With FeCl
2, NiCl
2And MnCl
2Solution mixes by predetermined molar ratio and is incorporated in the roasting of 880 ℃ of sprays, according to embodiment 2 same modes ZnO powder is blown into the lower position of baking furnace subsequently.The oxide that obtained partly kept at furnace bottom carried out dechlorination in about 60 minutes and handle.The composition of the powder that is obtained is calculated by weight, and is expressed as with oxide form: Fe
2O
3: NiO: MnO: ZnO=67.8: 7.7: 1.5: 23.0.X-ray diffraction the analysis showed that does not find ZnO.The Bi that in this powder, adds 0.05wt%
2O
3With the CuO of 3wt%, mixed 10 minutes with grinding machine, then, be molded as toroidal core with the dried machine granulation of spray, and at 1150 ℃ of sintering.Comparative Examples 4
Except not comprising the ZnO, prepare oxide according to embodiment 4 methods, add ZnO, Bi according to the ratio identical subsequently with embodiment 4
2O
3Mix 10 minutes (Comparative Examples 4a) with CuO and with grinding machine.According to the ratio identical with embodiment 4 with Fe
2O
3NiO, Mn
3O
4, ZnO and Bi
2O
3Mixture mix 10 minutes (Comparative Examples 4b) with grinding machine.Handle these powder according to embodiment 4 methods, wherein removed calcination process from.Thereby obtain with the core body that compares.
The density and the magnetic characteristic of the core body that is obtained are shown in table 6.
Table 6
Density μ iac
(g/cm
3) (100KHz, 20 ℃) embodiment 4 5.18 2110 Comparative Examples 4a 5.15 1570 Comparative Examples 4b 5.07 860 embodiment 5
With FeCl
2, MgCl
2And MnCl
2Solution is decided mixed in molar ratio and is sprayed roasting in 860 ℃ by the top.ZnO powder is blown at the lower position of baking furnace by embodiment 2 methods subsequently.The oxide that is obtained partly keeps at furnace bottom and carried out dechlorination in about 60 minutes and handle.The oxide of the powder that is obtained is formed, and is by weight: Fe
2O
3: MgO: MnO: ZnO=66.9: 12.2: 8.0: 12.9.X-ray diffraction the analysis showed that does not find ZnO.With the dried machine of spray powder is sprayed dried granulation, be molded as toroidal core and 1150 ℃ of following sintering 2 hours.Comparative Examples 5
Except that not comprising the ZnO, prepare oxide by the method for embodiment 5, the composition requirement according to embodiment 5 adds ZnO then, mixed 10 minutes with grinding machine subsequently, and repetition and embodiment 5 identical technologies is made a kind of sintering core body that is used for comparison.
The density of this sintering core body, magnetic characteristic and resistivity are shown in table 7.
Table 7
Density core body loss resistivity
(g/cm
3) (mW/cm
3，120KHz， (Ω·cm)
100mT, 100 ℃) embodiment 5 4.4 820 4 * 10
9Comparative Examples 5 4.3 1,750 1 * 10
9Embodiment 6
In 3000 liters of steel plate hydrochloric acid pickling waste liquors (this waste liquid has been concentrated to every 100ml iron content 25 grams), add the 250Kg manganese metal, be heated to 80 ℃ then manganese metal is wherein dissolved fully.The pH value of solution is not more than 0.1.
Ammonia is joined in this solution in Fig. 6 storage tank 33, thereby make pH value transfer to 4.0, by feeding pump 34 solution is sent in the stirring chamber 35 subsequently.On the other hand, 125Kg ZnO joined from storage tank 32 by feeding pump 34 stir the chamber 35, and fully stir and mix.Remain on 810 ℃ the stove by using spray equipment 36 and nozzle 37 that this solution is sprayed into temperature from the top of spray baking furnace subsequently,, obtain product 39 at furnace bottom so just with this solution oxide and roasting.
X-ray diffraction the analysis showed that the oxide that is generated is by Fe
2O
3, Mn
2O
3, spinelle and a small amount of ZnO form, and do not find chloride.
By the composition of chemical analysis mensuration Fe, Mn and Zn, the total amount of Fe, Mn and Zn is 100% (weight) as a result.The composition deviation of Fe, Mn and Zn is shown in table 8.As can be seen from Table 8, with spray before the roasting desired concentration ratio, this soft magnetic ferrite oxide and its difference are very little.
Weighing 1000g initial oxidation thing is to the CaCO that wherein adds 0.1wt%
3SiO with 0.01wt%
2, add pure water subsequently again, make the slip of 50% concentration.This slip is mixed in ball mill and drying, add the PVA that is used as binding agent then.After the granulation, it is molded as external diameter 36mm, the toroidal core of the high 10mm of internal diameter 24mm, and in the nitrogen atmosphere that contains 1% oxygen in 1340 ℃ of following sintering.
At 100KHz, under the condition of 200mT and 100 ℃, measure the core body loss of the sintering core body of making, just as shown in table 9 it have 280mW/cm
3Good magnetic characteristics.Comparative Examples 6
In 3000 liters of steel plate hydrochloric acid pickling waste liquors (this waste liquid has been concentrated to every 100ml iron content 25 grams), add the 250Kg manganese metal, be heated to 80 ℃ subsequently manganese metal is wherein dissolved fully.After sneaking into 125KgZnO, according to the method for embodiment 6, the top of this mixture from the spray baking furnace sprayed into and roasting oxidation, obtain product of roasting at furnace bottom.
X-ray diffraction the analysis showed that the oxide that is produced is by Fe
2O
3, Mn
2O
3Form with spinelle, do not find chloride.
By the composition of chemical analysis mensuration Fe, Mn and Zn, the total amount of Fe, Mn and Zn is 100wt% as a result.The composition deviation of Fe, Mn and Zn is shown in table 8.From table 8, can find, with the spray before desired concentration ratio, along with the relative increase of iron and manganese amount, Zn reduces significantly.
Weighing 1000g initial oxidation thing is to the CaCO that wherein adds ZnO (its consumption is identical with the amount of embodiment 6), 0.1wt%
3SiO with 0.01wt%
2, adding pure water subsequently again, to make concentration be 50% slip.This slip is mixed in ball mill and drying, add PVA (as binding agent) then.After the granulation, it is molded as external diameter 36mm, the toroidal core of internal diameter 24mm, high 10mm and in the nitrogen atmosphere that contains 1% oxygen in 1340 ℃ of sintering.
At 100KHz, under 200mT and the 100 ℃ of conditions, made sintering core body to be carried out the core body loss measure, the magnetic characteristic of this sample as shown in table 9 is 1800mW/cm
3Embodiment 7
In 3000 liters of steel plate hydrochloric acid pickling waste liquors (this waste liquid has been concentrated to every 100ml and has contained 25 gram iron), add the 250Kg manganese metal, be heated to 80 ℃ then manganese metal is wherein dissolved fully.The pH value of this solution is not more than 0.1.
In jar 33 the solution of Fig. 7, add ammonia, thereby the pH value is transferred to 3.2, spray into from the top that furnace temperature remains on 810 ℃ spray baking furnace 31 subsequently.On the other hand, 125Kg zinc oxide is mixed with pure water and spray into by spray equipment 36 and nozzle 37 main part from baking furnace 31.After the complete roasting oxidation, obtain product 39 at furnace bottom.
X-ray diffraction the analysis showed that the oxide that this generated is by Fe
2O
3, Mn
2O
3, spinelle and a small amount of ZnO form, and do not find chloride.
By the composition of chemical analysis mensuration Fe, Mn and Zn, the total amount of Fe, Mn and Zn is 100wt% as a result.The composition deviation of Fe, Mn and Zn is shown in table 8, as can be seen from Table 8, compares with concentration desired before the spray, and the difference of soft magnetic ferrite oxide is very little.
Weighing 1000g initial oxidation thing is to the CaCO that wherein adds 0.09wt%
3SiO with 0.013wt%
2Adding pure water subsequently again, to make concentration be 50% slip.In ball mill, this slip is mixed and drying, add PVA (as binding agent) then.After the granulation, it is molded as external diameter 36mm, the toroidal core of internal diameter 24mm, high 10mm, and in the nitrogen atmosphere that contains 1% oxygen in 1340 ℃ of sintering.
At 100KHz, measure the core body loss of this sintering core body under the condition of 200mT and 100 ℃, this sample as shown in table 9 has 290mW/cm
3Good magnetic characteristics.Comparative Examples 7
In 3000 liters of steel plate hydrochloric acid pickling waste liquors (this waste liquid has been concentrated to every 100ml iron content 25 grams), add the 250Kg manganese metal, be heated to 80 ℃ then manganese metal is wherein dissolved fully.Is that the top of 810 ℃ spray baking furnace sprays into (as shown in Figure 7) with this mixture from furnace temperature.125Kg zinc oxide mixed with pure water and spray into from the main part of as shown in Figure 7 baking furnace.Behind roasting oxidation, obtain product at furnace bottom.
X-ray diffraction the analysis showed that the oxide that this produced is by Fe
2O
3, Mn
2O
3Form with spinelle, do not find chloride.
By the composition of chemical analysis mensuration Fe, Mn and Zn, the total amount of Fe, Mn and Zn is 100% (weight) as a result.The deviation that Fe, Mn and Zn form is shown in table 8, therefrom can find, with desired concentration ratio before the spray roasting, along with the relative increase of iron and manganese amount, Zn reduces significantly.
Weighing 1000 gram initial oxidation things are to the CaCO that wherein adds ZnO (its consumption is identical with embodiment 7), 0.09wt%
3SiO with 0.013wt%
2Adding pure water subsequently again, to make concentration be 50% slip.This slip was mixed in ball mill 8 hours and drying, then to the PVA (as binding agent) that wherein adds 0.5%.After the granulation, it is molded as the toroidal core of external diameter 36mm, internal diameter 24mm, high 10mm, and in the nitrogen atmosphere that contains 1% oxygen in 1340 ℃ of sintering.
At 100KHz, measure the core body loss of this sintering core body under 200mT and the 100 ℃ of conditions, the magnetic characteristic of this sintering core body is 420mW/cm
3(being shown in table 9).
From embodiment 6 and 7 and the result of Comparative Examples 6 and 7 we learn, deviation does not take place in composition according to Zn of the present invention.This has just guaranteed to have the formation of initial oxidation thing of iron, manganese and zinc of the soft ferrite of fine dispersion ability, thereby might produce the goods with good magnetic characteristics.
In embodiment 6 and 7, described is to produce the ferritic method of Mn-Zn from a kind of chloride solution that contains iron and manganese and zinc oxide.The present invention is easy to be applied to use in the method for chloride solution of nickeliferous and magnesium (except the manganese).In order to regulate the pH value, can add ammonia, thereby the pH value is transferred to the level that needs.But this control method is not conclusive.
Table 8 analysis result
Composition 74.5 24.8 0.7 in composition 68.5 22.8 8.7 Comparative Examples 7 among composition 74.9 24.8 0.3 embodiment 7 in composition 68.9 23.0 8.1 Comparative Examples 6 among Fe Mn Zn prescription value 68.2 22.4 9.1 embodiment 6 after the roasting after the roasting after the roasting after the roasting
Table 9
The core body loss
(100KHz, 200mT, 100 ℃) embodiment 6 280mW/cm
3Comparative Examples 6 470mW/cm
3Embodiment 7 290mW/cm
3Comparative Examples 7 420mW/cm
3Embodiment 8
In 3000 liters of steel plate hydrochloric acid pickling waste liquors (this waste liquid has been concentrated to every 100ml iron content 25 grams), add the 250Kg manganese metal, be heated to 80 ℃ then manganese metal is wherein dissolved fully.Subsequently, be that the top of 810 ℃ spray baking furnace 41 sprays into (as shown in Figure 7) with this solution 42 from furnace temperature, roasting oxidation obtains product of roasting 44 at furnace bottom.When the oxide 44 that will obtain from furnace bottom is retained in furnace bottom, the aqueous solution that contains zinc chloride 15g among the 500 liters of every 100ml side 43 from furnace bottom is sprayed into.Bottom temperature is 700 ℃.After furnace bottom keeps 1 hour, collect formed oxide 45 from furnace bottom.
X-ray diffraction the analysis showed that formed oxide is by Fe
2O
3, Mn
2O
3Form with spinelle, do not find zinc chloride.
By the composition of chemical analysis mensuration Fe, Mn and Zn, the total amount of Fe, Mn and Zn is 100wt% as a result.Table 10 is depicted as desired Fe, Mn and the composition of Zn and the chemical analysis results that calcined oxide is formed of prescription among the embodiment 8.The composition of Fe, Mn and Zn with spray ratio of components desired before the roasting, difference is little, this product is suitable for use as the initial oxidation thing into soft ferrite.
Weighing 1000g initial oxidation thing is to wherein adding PVA (as binding agent).After the granulation, it is molded as the Troidal Core of external diameter 36mm, internal diameter 24mm, high 10mm and carries out sintering in 1340 ℃ in the nitrogen atmosphere that contains 1% oxygen.
At 1KHz, under the condition of 5mOe and 25 ℃, measure the original magnetic permeability of sintering core body, table 11 is depicted as the measurement result of original magnetic permeability, and the good magnetic characteristics that therefrom obtains as can be seen is 7000.Comparative Examples 8
In 3000 liters of steel plate hydrochloric acid pickling waste liquors (this waste liquid has been concentrated to every 100ml iron content 25g), add the 250Kg manganese metal, be heated to 80 ℃ then manganese metal is wherein dissolved fully.Subsequently, this solution is sprayed into from the top that furnace temperature remains on 850 ℃ spray baking furnace, roasting oxidation obtains product of roasting at furnace bottom.To in air, cool off at the oxide that furnace bottom obtains.Weigh up the 1000g oxide then, and in ball mill, its guarantee reagent Zinc oxide powder with 75 grams was mixed 10 hours.
The PVA that is used as binding agent is joined in the oxide powder of mixing.After the granulation, it is molded as the Troidal Core of external diameter 36mm, the high 10m of internal diameter 24mm and carries out sintering in 1340 ℃ in the nitrogen atmosphere that contains 1% oxygen.
Measure the original magnetic permeability of formed sintering core body under 1KHz, 5mOe and 25 ℃ of conditions, as shown in table 11, this magnetic permeability is low to reach 4000.
The result of embodiment 8 and Comparative Examples 8 shows that the oxide of producing iron, manganese and zinc according to the present invention need not relate to mixed oxidization zinc, so might prepare the soft ferrite initial oxidation thing with fine dispersion ability.In addition, because the sintering temperature that has utilized oxidation and kept at furnace bottom, so the cost of the comparable prior art processes method of the cost of the oxide of being produced is low.Embodiment 9
Prepare a kind of aqueous chloride solution (wherein every 100ml contains 30g iron ion, 10g manganese ion).Is that the top of 790 ℃ spray baking furnace 41 sprays into (as shown in Figure 8) with this aqueous solution from furnace temperature.In with this aqueous solution roasting oxidation, be the zinc chloride (ZnCl of 12.4g/100ml with concentration
2) aqueous solution 43, spray into from the main part bit position (temperature is 550 ℃) of stove.The oxide powder 45 that obtains from furnace bottom is carried out the X-ray diffraction analysis, and its result has confirmed Fe
2O
3, Mn
2O
3Form with the existence of spinelle.
According to chemical analysis, the composition of Fe, Mn and Zn is shown in table 10.So obtained not comprise the soft magnetic ferrite initial oxidation thing of any composition deviation.
Assurance (reagent) calcium carbonate (CaCO that in this initial oxidation thing, adds 900ppm subsequently
3) and assurance (reagent) silica (SiO of 100ppm
2), to make concentration be 50% slip to wherein adding pure water again.Then mixed 20 minutes in grinding machine, with the dried machine granulation of spray, machine pressing mold system obtains the toroidal core of external diameter 36mm, internal diameter 24mm, high 10mm.
With this molding in the nitrogen atmosphere that contains 1% oxygen in 1280 ℃ of following sintering 3 hours, obtain the sintering core body.Table 12 is depicted as this core body at 100KHz, the core body loss when 200mT and 80 ℃.Comparative Examples 9
Prepare a kind of aqueous chloride solution (wherein every 100ml contains the 30g iron ion, the 10g manganese ion).The top of this aqueous solution from 790 ℃ spray baking furnace sprayed into, and roasting oxidation.The oxide powder that obtains from furnace bottom is carried out the X-ray diffraction analysis, and its result has confirmed Fe
2O
3, Mn
2O
3Form with the existence of spinelle.
Allocate 75g zinc oxide (ZnO) in the per kilogram initial oxidation thing into, and add the guarantee reagent calcium carbonate (CaCO of 900ppm
3) and the guarantee reagent silicon dioxide (SiO of 100ppm
2).Adding pure water then, to make concentration be 50% slip.This slip was mixed in grinding machine 20 minutes.Do granulation with the dried machine spray of spray, the machine pressing mold is made the toroidal core of the high 10mm of external diameter 36mm internal diameter 24mm.
With this molding in the nitrogen atmosphere that contains 1% oxygen in 1280 ℃ of sintering 3 hours, obtain a kind of sintering core body.Table 12 is depicted as this core body at 100KHz, the core body loss when 200mT and 80 ℃.
The result of embodiment 9 and Comparative Examples 9 shows, sneaks in the oxide formation stage according to the present invention, so compare with known ferrite production method, the present invention has improved the uniformly dispersed of Zn with lower cost, and the magnetic characteristic of product is better.
In the above embodiments, oxide is that the form with the aqueous solution sprays into, yet also can it be added with powder type.
In addition, though zinc chloride adds, and carry out roasting in iron chloride and manganese chloride oxidizing process or after the oxidation, the component of preparing burden is not limited to mentioned above those.Except manganese chloride, can select at least a in nickel chloride and the magnesium chloride for use.
Table 10
Analysis result (wt%)
Form 70.3 22.5 6.8 after forming the roasting among 70.3 22.8 6.9 embodiment 9 after the roasting among prescription value 69.8 23.2 7.0 embodiment 8 of Fe Mn Zn expectation
Table 11
Initial permeability (1KHz, 25 ℃ of 0.50 Oe) embodiment 8 7000 Comparative Examples 8 4000
Table 12
Core body loss (100KHz, 200mT, 80 ℃) embodiment 9 350mW/cm
3Comparative Examples 9 400mW/cm
3
Claims (7)
1. the production method of the initial oxidation thing of a soft magnetic ferrite, this initial oxidation thing contains iron, zinc and at least a metal that is selected from magnesium, manganese, nickel and copper, and this method comprises:
Iron chloride and at least a chloride mixed aqueous solution that is selected from manganese chloride, magnesium chloride, nickel chloride and copper chloride are sent in the stove, and make its oxidation at this aqueous solution of high-temperature roasting, obtain a kind of composite oxides that constitute by iron and at least a metal that is selected from manganese, magnesium, nickel and copper; It is characterized in that this method also comprises:
A certain position in stove, forming or formed composite oxides have roasting heat and its temperature is not less than 400 ℃ at these position composite oxides, zinc oxide and/or a kind of compound that can easily be transformed into zinc oxide under this temperature are added, thereby obtain a kind of oxide that is used as the parent material of soft magnetic ferrite by the effect of roasting heat.
2. be that form with powder or slip adds according to the zinc oxide that the process of claim 1 wherein and/or the zinc compound that can easily be transformed into zinc oxide.
3. according to adding near the zinc oxide that the process of claim 1 wherein and/or the zinc compound that can easily the be transformed into zinc oxide position of sending into the aqueous solution in the stove.
4. according to the process of claim 1 wherein that the oxide that will be finally obtains remains under 300 to 1000 ℃ the temperature, thereby reduce the chlorinity in the final oxide that obtains, promote to form the spinelle phase simultaneously.
5. the production method of the initial oxidation thing of a soft magnetic ferrite, this initial oxidation thing contains iron, zinc and at least a metal that is selected from manganese, magnesium, nickel and copper, it is characterized in that this method comprises:
PH is transferred to 0.2 to 7.0, in and iron chloride and at least a muriatic mixed aqueous solution that is selected from manganese chloride, magnesium chloride, nickel chloride and copper chloride;
Chloride mixed aqueous solution behind the adjusting pH is sent in the stove, and made its oxidation, obtain a kind of composite oxides that constitute by iron and at least a metal that is selected from manganese, magnesium, nickel and the copper in high-temperature roasting;
A certain position in stove, forming and its furnace temperature is not less than 400 ℃ at these position composite oxides, zinc oxide and/or a kind of compound that can easily be transformed into zinc oxide are added, thereby obtain a kind of oxide as the soft magnetic ferrite parent material by the roasting heat effect.
6. according to the method for claim 5, zinc oxide wherein and/or the zinc compound that can easily be transformed into zinc oxide are that the form with powder or slip adds.
7. according to the method for claim 5, wherein the oxide that will finally obtain remains on 300 to 1000 ℃ temperature, thereby reduces the chlorinity in the final oxide that obtains, and promotes that simultaneously spinelle forms mutually.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP161218/90 | 1990-06-21 | ||
| JP2161218A JPH0453207A (en) | 1990-06-21 | 1990-06-21 | Manufacture of raw material oxide for soft ferrite |
| JP16562190 | 1990-06-26 | ||
| JP165621/90 | 1990-06-26 | ||
| JP165620/90 | 1990-06-26 |
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| CN1054459C true CN1054459C (en) | 2000-07-12 |
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| CN101692365B (en) * | 2009-08-21 | 2012-05-30 | 广东肇庆微硕电子有限公司 | Nickel-zinc soft magnetic ferrite material and preparation method thereof |
| CN105314973A (en) * | 2014-06-27 | 2016-02-10 | 明朔(北京)电子科技有限公司 | Nano-crystal ferrite soft magnetic composite material and preparation method thereof |
| CN112209423B (en) * | 2020-09-25 | 2022-03-18 | 南京理工大学 | Method for synthesizing ultrathin hollow sphere micron zinc aluminate by flame synthesis method in one step |
| CN112194187B (en) * | 2020-09-25 | 2022-03-15 | 南京理工大学 | Method for synthesizing zinc ferrite spherical nano material by premixed flame |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0277245A1 (en) * | 1986-07-26 | 1988-08-10 | Chemirite, Ltd. | Process for producing complex oxide to be used for producing ferrite |
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| EP0277245A1 (en) * | 1986-07-26 | 1988-08-10 | Chemirite, Ltd. | Process for producing complex oxide to be used for producing ferrite |
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