CN106747478A - A kind of pre-sinter process for improving manganese-zinc ferrite powder magnetization degree control accuracy - Google Patents
A kind of pre-sinter process for improving manganese-zinc ferrite powder magnetization degree control accuracy Download PDFInfo
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- CN106747478A CN106747478A CN201611021877.4A CN201611021877A CN106747478A CN 106747478 A CN106747478 A CN 106747478A CN 201611021877 A CN201611021877 A CN 201611021877A CN 106747478 A CN106747478 A CN 106747478A
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
- C04B35/62675—Thermal treatment of powders or mixtures thereof other than sintering characterised by the treatment temperature
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
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- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
- C04B35/6268—Thermal treatment of powders or mixtures thereof other than sintering characterised by the applied pressure or type of atmosphere, e.g. in vacuum, hydrogen or a specific oxygen pressure
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Abstract
The invention discloses the pre-sinter process that a kind of manganese-zinc ferrite powder controls magnetization degree, take manganese-zinc ferrite powder, the pre-burning in segmented revolution cellar for storing things, calcined temperature is 900 DEG C ~ 1050 DEG C, soaking time is 30 ~ 50 minutes, at 180 ~ 280 DEG C, cyclone temperature is controlled at 150 ~ 220 DEG C rotary kiln end temperature control, and scrubbing tower blower fan temperature control is at 80 ~ 120 DEG C.The pre-sinter process is by adjusting the cooling rate in manganese-zinc ferrite pre-sinter process and air inlet amount, the Con trolling index such as monitoring rotary kiln temperature of kiln head, cyclone temperature, scrubbing tower blower fan temperature, product magnetization degree extreme difference can as needed be controlled, solve formed product difficulty improve production efficiency, the sintering adhesion of small-size product magnetic core, large scale product magnetic core sintering problems of crack, it is simple with method of adjustment, operation facility, low cost, the advantage of high efficiency.
Description
Technical field
The present invention relates to manganese-zinc ferrite magnetic material production technical field, and in particular to a kind of manganese-zinc ferrite powder is high
The pre-sinter process of precision controlling magnetization degree.
Background technology
At present, in manganese-zinc ferrite core production, often there is difficult forming, sintering adhesion, sintering problems of crack,
Influence product percent of pass, influences production efficiency.
On difficult forming problem, when magnetization degree extreme difference is larger in specific same batch, due to there is larger planted agent
Magnetization degree is different between power and each several part, and pre-burning degree difference is big, can there is the situation for being difficult to be molded during compacted products, on sintering
Adhesion problems, when magnetization degree is too low, the expansion rate that sintering warming-up section blank is presented is big, and contraction change is small, is easily caused adjacent base
Part sticks together；Increase blank vent gap can improve adhesion phenomenon, but be reduction of production efficiency, and energy consumption increases.And sinter
Problem of Cracking be due to magnetization degree extreme difference it is larger when, the shrinkage factor curve of blank each several part is different, speed differs, and easily occurs strong
Deformation cause cracking.
The content of the invention
The present invention needs the technical scheme for solving to be to provide one kind can effectively control product magnetization degree extreme difference to be less than 0.02 μ H/
G, solves difficult formed product, sintering adhesion, the pre-sinter process of the manganese-zinc ferrite powder control magnetization degree of sintering problem of Cracking.
The technical solution adopted by the present invention is：
A kind of pre-sinter process for improving manganese-zinc ferrite powder magnetization degree control accuracy, takes manganese-zinc ferrite powder, in segmented
Pre-burning in revolution cellar for storing things, calcined temperature is 900 DEG C ~ 1050 DEG C, and soaking time is 30 ~ 50 minutes；Interior temperature in cellar drops from calcined temperature
During to 450 DEG C, cooling rate control is controlled in 0.10m in 40 DEG C/min, air capacity3/s~0.42m3/s；Interior temperature in cellar is from 450 DEG C
When being down to 100 DEG C, cooling rate control is controlled in 0.20m in 45 DEG C/min, air capacity3/s~0.50m3/s；Rotary kiln end temperature
At 180 ~ 280 DEG C, cyclone temperature is controlled at 150 ~ 220 DEG C, and scrubbing tower blower fan temperature control is 80 ~ 120 for degree control
DEG C, under the same calcined temperature for obtaining, the μ H/g of magnetization degree 0.3 ~ 2.0 of pre-burning manganese-zinc ferrite powder.
Preferably, under same calcined temperature, rotary kiln end temperature controlling range is ± 10 DEG C.
Preferably, under same calcined temperature, cyclone temperature control range is ± 6 DEG C.
Preferably, under same calcined temperature, scrubbing tower blower fan temperature controlling range is ± 3 DEG C.
Preferably, the magnetization degree of the pre-burning manganese-zinc ferrite powder is 0.6 ~ 1.7 μ H/g.
Preferably, under same calcined temperature, magnetization degree extreme difference is 0.01-0.02 μ H/g to pre-burning manganese-zinc ferrite powder.
Uniformity is better than conventional magnetization degree control device.
Rotary kiln end temperature, cyclone temperature, scrubbing tower blower fan temperature are Con trolling index, rate of temperature fall, air
It is control device to measure.
By adjusting the cooling rate in manganese-zinc ferrite pre-sinter process and air inlet amount, magnetization degree can be adjusted
It is whole, but because long-time is continuously used, pipeline state can change in rotary kiln exhaust system, by controlling rotary kiln
Head, cyclone separator, the temperature of scrubbing tower blower fan, can stablize actual air inlet amount and kiln temperature, control as needed
Product magnetization degree extreme difference processed, solves formed product difficulty improve production efficiency, and small-size product magnetic core sintering adhesion, large scale is produced
Product magnetic core sinters problems of crack, simple with method of adjustment, operation facility, low cost, the advantage of high efficiency.
Specific embodiment
The present invention can be further appreciated that by the specific implementation case of invention now given below, but they are not to this
The restriction of invention.
Embodiment 1
Manganese-zinc ferrite powder is taken, the pre-burning in segmented revolution cellar for storing things, calcined temperature is 900 DEG C, and soaking time is 50 minutes, cellar for storing things
Interior temperature from be down to 450 DEG C for 900 DEG C when, in 40 DEG C/min, air capacity is controlled in 0.20m for cooling rate control3/s~0.30m3/s；
Interior temperature in cellar from be down to 100 DEG C for 450 DEG C when, in 45 DEG C/min, air capacity is controlled in 0.20m for cooling rate control3/s~0.35m3/
S, at 210 DEG C, cyclone temperature is controlled at 170 DEG C rotary kiln end temperature control, and scrubbing tower blower fan temperature control is 85
DEG C, the magnetization degree of the pre-burning manganese-zinc ferrite powder for obtaining is 0.4 μ H/g, and magnetization degree extreme difference is 0.01 μ H/g.
Embodiment 2
Manganese-zinc ferrite powder is taken, the pre-burning in segmented revolution cellar for storing things, calcined temperature is 960 DEG C, and soaking time is 40 minutes, cellar for storing things
Interior temperature from be down to 450 DEG C for 960 DEG C when, in 40 DEG C/min, air capacity is controlled in 0.15m for cooling rate control3/s~0.40m3/s；
Interior temperature in cellar from be down to 100 DEG C for 450 DEG C when, in 45 DEG C/min, air capacity is controlled in 0.25m for cooling rate control3/s~0.40m3/
S, at 220 DEG C, cyclone temperature is controlled at 190 DEG C rotary kiln end temperature control, and scrubbing tower blower fan temperature control is 95
DEG C, the magnetization degree of the pre-burning manganese-zinc ferrite powder for obtaining is 1.0 μ H/g, and magnetization degree extreme difference is 0.01 μ H/g.
Embodiment 3
Manganese-zinc ferrite powder is taken, the pre-burning in segmented revolution cellar for storing things, calcined temperature is 980 DEG C, and soaking time is 37 minutes, cellar for storing things
Interior temperature from be down to 450 DEG C for 980 DEG C when, in 40 DEG C/min, air capacity is controlled in 0.25m for cooling rate control3/s~0.42m3/s；
Interior temperature in cellar from be down to 100 DEG C for 450 DEG C when, in 45 DEG C/min, air capacity is controlled in 0.30m for cooling rate control3/s~0.50m3/
S, at 240 DEG C, cyclone temperature is controlled at 220 DEG C rotary kiln end temperature control, and scrubbing tower blower fan temperature control is 105
DEG C, the magnetization degree of the pre-burning manganese-zinc ferrite powder for obtaining is 1.5 μ H/g, and magnetization degree extreme difference is 0.02 μ H/g.
Manganese-zinc ferrite has the process of oxygen uptake, partial reaction when oxygen absorbed increases meeting by pre-burning in pre-burning temperature-fall period
Generation makes the reduction of material magnetic with the oxidation of magnetic Mn ferrite, shows as magnetization degree reduction, namely degree of oxidation and magnetization
Degree is inversely.
During compressing, optimum state is that the briquetting pressure of each several part is homogeneous to manganese-zinc ferrite, if between each several part
Magnetization degree extreme difference is larger, then can there is larger internal stress, then there is large effect to mouldability, and when can influence sintering
Contraction state.
Manganese-zinc ferrite has the process of expansion-contraction in the sintering process between 300 DEG C ~ 800 DEG C, magnetization degree extreme difference is big
Blank heat up when each several part between the coefficient of expansion there is larger difference, magnetization degree blank expansion rate higher is smaller, or even
The contraction of dullness is only existed, contraction speed differs between each several part deforms blank, finally deforming excessive causes product to ftracture.
According to different calcined temperatures, set the rotary kiln end temperature of certain control range, cyclone temperature, wash
Tower blower fan temperature control index is washed, is continuously used in boiler tube, in the case that BF's inner state changes, by adjusting rate of temperature fall
With air capacity, pre-burning state in stove is set to be maintained at the state of stable uniform.
The present invention is mainly according to above-mentioned principle, with rotary kiln end temperature, cyclone temperature, scrubbing tower blower fan temperature
It is Con trolling index to spend, by adjusting the air capacity of pre-burning temperature descending section, by magnetization degree control in more accurate scope.Magnetization degree can
With instrument test, enclosed in columnar nonmetallic vessel Shangrao 400 of a designated volume with enamel-covered wire, test empty with inductance instrument
The inductance value L0 of wire-core coil, after Preburning material is filled into container, then the inductance value L1 of re-test coil weighs tested pre-burning
The weight of material, magnetization degree is calculated according to the following formula：
x=(L1-L0)/m
Wherein, x：Magnetization degree；L0：Air cored coil inductors amount, unit is μ H；L1：The inductance value of coil, unit after loading Preburning material
It is μ H；m：The weight of surveyed Preburning material, unit is g.
Compared with prior art, the present invention is by adjusting cooling rate and air inlet in manganese-zinc ferrite pre-sinter process
Amount, control rotary kiln end temperature, cyclone temperature, scrubbing tower blower fan temperature, the actual air inlet amount of stabilization and kiln
Interior temperature, controls product magnetization degree extreme difference as needed, solves formed product difficulty improve production efficiency, small-size product magnetic core
Sintering adhesion, large scale product magnetic core sintering problems of crack, operation facility, low cost, high efficiency simple with method of adjustment
Advantage.
Claims (3)
1. it is a kind of improve manganese-zinc ferrite powder magnetization degree control accuracy pre-sinter process, it is characterized in that taking manganese-zinc ferrite powder
Material, the pre-burning in segmented revolution cellar for storing things, calcined temperature is 900 DEG C ~ 1050 DEG C, and soaking time is 30 ~ 50 minutes；Interior temperature in cellar from
When calcined temperature is down to 450 DEG C, cooling rate control is controlled in 0.10m in 40 DEG C/min, air capacity3/s~0.42m3/s；In cellar for storing things
Temperature from be down to 100 DEG C for 450 DEG C when, in 45 DEG C/min, air capacity is controlled in 0.20m for cooling rate control3/s~0.50m3/s；Return
At 180 ~ 280 DEG C, cyclone temperature is controlled in 150 ~ 220 DEG C, scrubbing tower blower fan temperature control the control of rotary kiln temperature of kiln head
At 80 ~ 120 DEG C, under the same calcined temperature for obtaining, the μ H/g of magnetization degree 0.3 ~ 2.0 of pre-burning manganese-zinc ferrite powder.
2. a kind of pre-sinter process for improving manganese-zinc ferrite powder magnetization degree control accuracy according to claim 1, it is special
Levy be pre-burning manganese-zinc ferrite powder under same calcined temperature, magnetization degree extreme difference be 0.01-0.02 μ H/g.
3. a kind of pre-sinter process for improving manganese-zinc ferrite powder magnetization degree control accuracy according to claim 1, it is special
Levy be pre-burning manganese-zinc ferrite powder magnetization degree be 0.6 ~ 1.7 μ H/g.
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| CN103588486A (en) * | 2013-11-13 | 2014-02-19 | 宝钢磁业（江苏）有限公司 | Manganese zinc ferrite powder pre-sintering technology capable of controlling magnetization degree |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103588486A (en) * | 2013-11-13 | 2014-02-19 | 宝钢磁业（江苏）有限公司 | Manganese zinc ferrite powder pre-sintering technology capable of controlling magnetization degree |
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