CN109894214A - A kind of dual chamber two-stage ball mill and the broken method of efficient permanent magnet ferrite fines - Google Patents
A kind of dual chamber two-stage ball mill and the broken method of efficient permanent magnet ferrite fines Download PDFInfo
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Abstract
The present invention relates to crushing material technical fields.The invention discloses a kind of dual chamber two-stage ball mills, it includes cylinder, bracket and driving mechanism, ball milling chamber there are two being set in cylinder, respectively level-one ball milling chamber and second level ball milling chamber, level-one ball milling chamber is disposed adjacent with second level ball milling chamber, is connected between level-one ball milling chamber and second level ball milling chamber by valve；The invention also discloses a kind of broken methods of efficient permanent magnet ferrite fines realized by dual chamber two-stage ball mill comprising level-one ball milling and second level ball milling.The present invention can realize two-stage ball-milling technology in a table grinder, and can be improved the stability of different batches slurry, increase the uniformity of ball milling, improve grinding efficiency, being processed rear slurry particle diameter distribution, ball milling is also narrower compared with prior art；The slurry particle diameter distribution that the broken method of efficient permanent magnet ferrite fines has many advantages, such as that grinding efficiency is high, process is simple, strong operability, stability are high, grinds is narrow, and slurry shaping efficiency is high.
Description
Technical field
The present invention relates to crushing material technical fields, more particularly, to a kind of dual chamber two-stage ball mill and efficient permanent magnet iron
The finely divided method of oxysome.
Background technique
Broken ferrite fines are a highly important links in ferrite production technique, are the ferrites for obtaining pre-burning
Coarse powder is obtained after coarse crushing obtains the thinner molding slurry of granularity using further finely divided.Preburning material is a kind of
Density is small, the substance with ferrite crystal structure loosely, and refines Preburning material by fine crushing process to obtain slurry,
Make it have preferable size distribution, good double sintering chemical reactivity, preferable blank mouldability is to finally obtaining
The magnet of high yield rate of good performance has a very important role.
Slurry Granularity distribution after finely divided is an important factor for influencing slurry processability, and the ratio of large or fine granule will take
With reasonable, if thick particles are excessive, fine grain particle is few, and grading curve moves to right, and blank porosity is big after molding, burns
Magnet stomata is more after knot, and crystal growth is also discontinuous, big crystal grain " annexation " little crystal grain, and big crystal grain ratio is excessive in magnet, magnet
Degradation.If fine grain particle is excessive, thick particles are very few, will lead to molding time lengthening, influence shaping efficiency, at
Blind crack increases inside type blank, and magnet cracking increases after sintering, influences yield rate.Therefore comparatively ideal particle diameter distribution should be in
An existing normal distribution curve, large or fine granule are reasonably distributed, and normal distribution curve " sharp " is got over in ferrite production a bit
Favorably.
The finely divided method of ferrite production of existing mainstream mainly has ball milling and sand milling, and ferrite production is cylinder with ball mill
Shape structure, both ends are welded with two pieces of circular metal plates, form a closed cylindrical body.Inside is equipped with ball-milling medium steel ball, crushed material
Material, disperse means water are driven by a motor ball mill barrel rotation, and barrel body rotation drives the intracorporal steel ball of cylinder to move together with material,
Centrifugal force and ball mill barrel inner wall frictional force effect under, steel ball promoted to certain altitude, then under gravity under
It falls, material crushes under the impact of steel ball, is reached by the shock friction between ball and ball, between ball and barrel wall, ball and material
To the effect that Preburning material is levigate.Sand mill is to make the steel ball in cylinder with rotating circular disk or stirring rod in a vertical cylinder
Random high-speed motion is generated, abrasive action is played to material in cylinder.Mass production ferrite fines are broken at present uses ball mill
It is more, it is internal equipped with several " muscle " for being used to reinforce steel ball Yu the mutual collision effect of material, generally rectangular in shape or circle
Arc, by the levigate material of the uniform rotation of ball mill, permanent-magnet ferrite is Magnetoplumbate-type crystal structure, brilliant intracorporal structure cell
Each ion is mainly to be mutually bonded by the effect of ionic bond, and bonding force is only second to atom key, therefore permanent-magnet ferrite macroscopic view table
Now to be hard and crisp, therefore to be milled to the granularity of submicron order not only Ball-milling Time is longer, especially high performance permanent-magnet ferrite
Material requirements slurry particle diameter distribution is narrower, and crystal grain is thinner, this is just needed by two-stage ball milling, by the slurry in a table grinder
Slurry is transferred to an other table grinder with high pressure draught, not only the time-consuming and laborious stability to different batches slurry also have compared with
Big to influence, the disintegrating process as mentioned a kind of permanent ferrite prefiring material in patent CN 102553683A utilizes two table grinders
Classified grinding, performance improve compared to prior art, but not only the device is complicated for the technique, and processing step is cumbersome, to behaviour
Make the higher stability to control slurry of level requirement and brings great difficulty.
Summary of the invention
To solve the above problems, the present invention provides a kind of dual chamber two-stage ball mill, it can be real in a table grinder
Existing two-stage ball-milling technology, and can be improved the stability of different batches slurry, increase the uniformity of ball milling, improves ball milling effect
Rate, being processed rear slurry particle diameter distribution, ball milling is also narrower compared with prior art；
The present invention also provides a kind of broken methods of efficient permanent magnet ferrite fines realized by above-mentioned dual chamber two-stage ball mill.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of dual chamber two-stage ball mill comprising cylinder, bracket and driving mechanism set that there are two ball milling chambers in cylinder, respectively
For level-one ball milling chamber and second level ball milling chamber, level-one ball milling chamber is disposed adjacent with second level ball milling chamber, level-one ball milling chamber and second level ball milling
It is connected between chamber by valve.Feed inlet and outlet is equipped on level-one ball milling chamber and second level ball milling chamber.
Preferably, ball milling chamber is elliposoidal ball milling chamber, the ratio of two polar radius and equatorial radius of level-one ball milling chamber
For (1.4~3.2): (1.4~3.2): 1, two polar radius of second level ball milling chamber and the ratio of equatorial radius are (1.2~3):
(1.2~3): 1.
Ball mill in the present invention is that cylindrical tube body is interior there are two the cavity of ellipse, can be very using oval cavity
Good dispersion is impacted from steel ball, Preburning material, disperse means to two end motion brings, is made its uniform stressed in entire cylinder, is increased
The uniformity of ball milling, improves grinding efficiency, and adjacent two oval cavitys may be implemented two-stage ball milling, after first order ball milling
Slurry is beaten with air pressure to second level ball milling is carried out in another cavity of cylinder, realizes two-stage mill by two conventional table grinders
Technique can be realized to a table grinder of the invention, not only save a table grinder equipment, but also slurry in the same cylinder
Transmission it is more convenient, operating procedure is simple, is conducive to the stability of different batches slurry, and particle diameter distribution compares level-one ball
Mill is also narrower, very crucial to high-performance permanent magnetic ferrite material is prepared.The present invention is not related to the portions such as ball mill driving mechanism
Prior art solution can be used in the change of part, component and processing method in addition to involved in the present invention.
Preferably, level-one ball milling chamber and second level ball milling cavity wall are equipped with several equally distributed convex blocks, the top of convex block
Face is equipped with circular groove.
Preferably, the central angle of the circular groove of convex block top surface is 70 °~190 °.
During ball mill one circle of rotation, the table for converting the kinetic energy of motor to Preburning material crushing how is maximized
Face can, Preburning material grinds thinner surface and can increase bigger, and the required function being transformed on Preburning material is also more.
In mechanical milling process, the loss of energy mainly has three bulks, and first piece is that electric energy by motor is converted into mechanical energy
When generate loss, according to higher electric efficiency 93% or so calculate, this portion of energy lose 7% or so, this partial loss is straight
It connects with motor performance correlation, room for promotion is limited；Second piece is that the mechanical energy that motor exports is converted into ball milling into transmission system is crossed
The energy loss of the mechanical energy of medium, this block typically constitutes from 10~15% of total energy consumption or so, depends primarily on the efficiency of transmission system
Just, the effect that this part is promoted is also limited；Third block is that the mechanical energy of ball-milling medium is converted into the surface energy of Preburning material, according to phase
Close document report, really act on improve Preburning material surface can function only account for 0.3~1.3% or so of input work, most of function at
For ball milling lost work, these ball milling lost works are mainly shown as Preburning material, ball-milling medium and abrading-ball, between abrading-ball, abrading-ball and lining
The heat generated is hit in the phase mutual friction of plate etc., so intuitively observing that the slurry temperature after ball milling can be up to 70 sometimes
More degree.Therefore during rotation, the mechanical energy for improving ball-milling medium just has biggish space to ball mill.In ball milling in the present invention
Several convex blocks are arranged in cavity inner wall can improve the mechanical energy of abrading-ball during ball mill rotates a circle, and convex block can be than traditional ball
Grinding machine preferably " pocket " lives abrading-ball, improves its potential energy, it is pre- that kinetic energy striking impact is converted into when turning to certain position to it
Imitation frosted glass, while the Preburning material of greater particle size is milled to lesser partial size as below two by the kinetic energy for using biggish abrading-ball to increase abrading-ball
Further fine grinding lays the foundation grade.Convex block top surface is equipped with circular groove, and arcwall face is conducive to the potential energy for further promoting abrading-ball,
A part of abrading-ball is gathered on arcwall face, when ball mill rotates, in the frictional force of centrifugal force and lug surface arc, effect
Under, abrading-ball is promoted under higher height, is formed many a waterfall types under gravity and is let out the effect fallen, in this mode
Under, abrading-ball is stronger to the impact of material, abrading-ball and Preburning material phase mutual friction, abrading-ball, convex block, the Preburning material between cavity wall
The frequency that rubs is higher, is conducive to efficient levigate Preburning material, increases its surface energy.
Revolving speed is too low, inadequate for large-sized Preburning material impact force, influences final ball milling effect, revolving speed is excessively high, steel
The centrifugal force of ball is more than gravity, and steel ball is easy close to barrel, and steel ball greatly reduces the percussion of Preburning material, does not have crushing
Effect.
In addition it uses to rotate clockwise and can greatly avoid ball milling dead angle with the ball milling method of alternate rotation counterclockwise, improve
The stability and consistency of different batches ball milling are laid a good foundation for the technology controlling and process of molding and sintering process below.
Preferably, the width of convex block and the ratio of the longer polar radius of ball milling chamber are 1:20~70, convex in level-one ball milling chamber
The height of block and the ratio of the longer polar radius of ball milling chamber are 1:18~50；In second level ball milling chamber, the width of convex block is and ball milling
The ratio of the longer polar radius of chamber is 1:40~80, and the height of convex block and the ratio of the longer polar radius of ball milling chamber are 1:30~50.
Preferably, convex block is strip, the other end is extended to by one section of ball milling chamber polar axis.
Preferably, being equipped with 7~14 convex blocks in level-one ball milling chamber.8~13 convex blocks are equipped in second level ball milling chamber.
Preferably, convex block is the convex block that bottom surface is square.
Preferably, being equipped with 7~14 pieces of bottom surfaces in level-one ball milling chamber is square convex block.In second level ball milling chamber be equipped with 8~
13 pieces of bottom surfaces are square convex block.
A kind of broken method of efficient permanent magnet ferrite fines realized by dual chamber two-stage ball mill, comprises the steps of,
A) ball milling raw material is added in level-one ball milling chamber, and abrading-ball and ball-milling medium is added；
B) it level-one ball milling: is handled clockwise 50~100 minutes with the revolving speed of 20~35rpm, then with 15~30rpm revolving speed inverse time
Needle is handled 50~100 minutes；
C) it is handled 5~10 hours in circulating repetition step b)；
D) by slurry pipeline transport obtained after level-one ball-milling treatment into second level ball milling chamber；
E) it second level ball milling: is handled clockwise 50~100 minutes with the revolving speed of 20~35rpm, then with 15~30rpm revolving speed inverse time
Needle is handled 50~100 minutes；
F) it is handled 5~10 hours in circulating repetition step e)；
G) by the slurry pipeline transport obtained after above-mentioned steps are handled to expecting tower.
Preferably, the ratio of ball milling raw material, abrading-ball and ball-milling medium is 1:(4~7 in mechanical milling process): (1.1~
1.4).
Preferably, ball-milling medium is water.
Preferably, step d) is specifically, open the valve between level-one ball milling chamber and second level ball milling chamber, using high pressure gas
Body is by the slurry pipeline transport after level-one ball-milling treatment into second level ball milling chamber.
Preferably, the abrading-ball that step b) level-one ball milling uses is the steel ball of 7~11mm of diameter；Step e) second level ball milling is adopted
Abrading-ball is the steel ball of 3.5~8mm of diameter.
Second level ball milling use thinner steel ball, be based in the first order cavity Preburning material after being milled to certain granularity,
It is a kind of main that the mode of phase mutual friction between steel ball and between steel ball and convex block, barrel, water, which carrys out further levigate Preburning material,
Grinding mode, to mention high surface energy contribution accounting increase, therefore steel ball directly impact Preburning material demand reduction.
Preferably, while step e) carries out second level ball milling, be added in level-one ball milling chamber new ball milling raw material simultaneously into
Row level-one ball-milling treatment.
Therefore, the dual chamber two-stage ball mill the invention has the following advantages: compared with prior art, in the present invention
And the broken method of efficient permanent magnet ferrite fines has the material that grinding efficiency height, process are simple, strong operability, stability are high, grind
Starch the advantages that particle diameter distribution is narrow, and slurry shaping efficiency is high；It is milled to identical partial size, using the dual chamber two-stage ball milling in the present invention
Machine and the broken method of efficient permanent magnet ferrite fines can shorten Ball-milling Time 3~6 hours, and under identical operating condition, magnetic property improves 50
~100Gs, slurry molding time save 15~25%, and integrated yield improves 5~20%, 100~400Oe of intrinsic raising.
Detailed description of the invention
Fig. 1 is a kind of schematic cross-section of dual chamber two-stage ball mill in the present invention；
Fig. 2 is a kind of schematic cross-section of dual chamber two-stage ball mill level-one ball milling chamber in the present invention；
Fig. 3 is a kind of schematic cross-section of dual chamber two-stage ball mill second level ball milling chamber in the present invention；
Fig. 4 is a kind of schematic cross-section of dual chamber two-stage ball mill ball milling cavity wall convex block in the present invention；
Fig. 5 is different ball milling grain size distributions.
In figure: cylinder 1, bracket 2, driving mechanism 3, level-one ball milling chamber 4, second level ball milling chamber 5, valve 6, convex block 7 are arc-shaped
Groove 8, feed inlet and outlet 9.
Specific embodiment
Further description of the technical solution of the present invention With reference to embodiment.
Obviously, the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, all other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
In the present invention, if not refering in particular to, all equipment and raw material is commercially available or the industry is common,
Method in following embodiments is unless otherwise instructed conventional method in that art.
The ball milling raw material used in following embodiments and comparative example is the ferrite prefiring material of identical label and secondary adds
Add CaCO31.0 wt%, SiO2 0.3wt%, La2O31.0wt %, Co3O40.5wt %, the wherein median particle diameter of ball milling raw material
D50It is 4.5 microns.
Embodiment 1
A kind of dual chamber two-stage ball mill comprising cylinder 1, bracket 2 and driving mechanism 3 set that there are two elliposoidal balls in cylinder
Mill chamber, respectively level-one ball milling chamber 4 and second level ball milling chamber 5, level-one ball milling chamber is disposed adjacent with second level ball milling chamber, level-one ball milling chamber
It is connected between second level ball milling chamber by valve 6；Two polar radius of level-one ball milling chamber and the ratio of equatorial radius are 1.4:
1.4:1, two polar radius of second level ball milling chamber and the ratio of equatorial radius are 1.2:1.2:1；Level-one ball milling chamber and second level ball milling
Cavity wall is equipped with several equally distributed convex blocks 7, and the top surface of convex block is equipped with circular groove 8；In level-one ball milling chamber, convex block
The ratio of width and the longer polar radius of ball milling chamber is 1:20, and the height of convex block and the ratio of the longer polar radius of ball milling chamber are 1:
18, the central angle of the circular groove of convex block top surface is 70 °；In second level ball milling chamber, the width of convex block is and the longer pole of ball milling chamber
The ratio of radius is 1:40, and the ratio of the height of convex block and the longer polar radius of ball milling chamber is 1:30, convex block top surface it is arc-shaped
The central angle of groove is 70 °；Convex block is the convex block that bottom surface is square, and is square in level-one ball milling chamber equipped with 7 pieces of bottom surfaces convex
Block is equipped with 8 pieces of bottom surfaces in second level ball milling chamber and is square convex block.
A kind of broken method of efficient permanent magnet ferrite fines realized by dual chamber two-stage ball mill, comprises the steps of,
A) ball milling raw material is added in level-one ball milling chamber, and abrading-ball and water is added, the ratio of ball milling raw material, abrading-ball and water is 1:
4:1.1；Abrading-ball uses diameter for the steel ball of 7mm；
B) it level-one ball milling: is handled 50 minutes with the revolving speed of 20rpm, is then handled counterclockwise 50 minutes with 15rpm revolving speed clockwise；
C) it is handled 5 hours in circulating repetition step b)；
D) valve between level-one ball milling chamber and second level ball milling chamber is opened, using high pressure gas by the material after level-one ball-milling treatment
Slurry is delivered in second level ball milling chamber, and makes the ratio 1:4:1.1 of ball milling raw material, abrading-ball and water, and abrading-ball uses diameter for 3.5mm
Steel ball；
E) it second level ball milling: is handled 50 minutes with the revolving speed of 20rpm, is then handled counterclockwise 50 minutes with 15rpm revolving speed clockwise；
F) it is handled 5 hours in circulating repetition step e)；
G) by the slurry pipeline transport obtained after above-mentioned steps are handled to expecting tower.
In addition, new ball milling raw material is added in level-one ball milling chamber while carrying out one while step e) carries out second level ball milling
Grade ball-milling treatment.
Embodiment 2
A kind of dual chamber two-stage ball mill comprising cylinder 1, bracket 2 and driving mechanism 3 set that there are two elliposoidal balls in cylinder
Mill chamber, respectively level-one ball milling chamber 4 and second level ball milling chamber 5, level-one ball milling chamber is disposed adjacent with second level ball milling chamber, level-one ball milling chamber
It is connected between second level ball milling chamber by valve 6；Two polar radius of level-one ball milling chamber and the ratio of equatorial radius are 3.2:
1.4:1, two polar radius of second level ball milling chamber and the ratio of equatorial radius are 3:3:1；Level-one ball milling chamber and second level ball milling are intracavitary
Wall is equipped with several equally distributed convex blocks 7, and the top surface of convex block is equipped with circular groove 8；In level-one ball milling chamber, the width of convex block
Ratio with the longer polar radius of ball milling chamber is 1:70, and the height of convex block and the ratio of the longer polar radius of ball milling chamber are 1:50, convex
The central angle of the circular groove of block top surface is 190 °；In second level ball milling chamber, the width of convex block is and the longer polar radius of ball milling chamber
Ratio be 1:80, the ratio of the height of convex block and the longer polar radius of ball milling chamber is 1:50, the circular groove of convex block top surface
Central angle be 190 °；Convex block is strip, extends to the other end by one section of ball milling chamber polar axis, is equipped with 14 in level-one ball milling chamber
Convex block is equipped with 13 convex blocks in second level ball milling chamber.
A kind of broken method of efficient permanent magnet ferrite fines realized by dual chamber two-stage ball mill, comprises the steps of,
A) ball milling raw material is added in level-one ball milling chamber, and abrading-ball and water is added, the ratio of ball milling raw material, abrading-ball and water is 1:
7:1.4；Abrading-ball uses diameter for the steel ball of 11mm；
B) it level-one ball milling: is handled clockwise 100 minutes with the revolving speed of 35rpm, then handles 100 points counterclockwise with 30rpm revolving speed
Clock；
C) it is handled 10 hours in circulating repetition step b)；
D) valve between level-one ball milling chamber and second level ball milling chamber is opened, using high pressure gas by the material after level-one ball-milling treatment
Slurry is delivered in second level ball milling chamber, and makes the ratio 1:7:1.4 of ball milling raw material, abrading-ball and water, and abrading-ball uses diameter for 8mm's
Steel ball；
E) it second level ball milling: is handled clockwise 100 minutes with the revolving speed of 35rpm, then handles 100 points counterclockwise with 30rpm revolving speed
Clock；
F) it is handled 10 hours in circulating repetition step e)；
G) by the slurry pipeline transport obtained after above-mentioned steps are handled to expecting tower.
In addition, new ball milling raw material is added in level-one ball milling chamber while carrying out one while step e) carries out second level ball milling
Grade ball-milling treatment.
Embodiment 3
A kind of dual chamber two-stage ball mill comprising cylinder 1, bracket 2 and driving mechanism 3 set that there are two elliposoidal balls in cylinder
Mill chamber, respectively level-one ball milling chamber 4 and second level ball milling chamber 5, level-one ball milling chamber is disposed adjacent with second level ball milling chamber, level-one ball milling chamber
It is connected between second level ball milling chamber by valve 6；Two polar radius of level-one ball milling chamber and the ratio of equatorial radius are 2.3:
2.3:1, two polar radius of second level ball milling chamber and the ratio of equatorial radius are 2.1:2.1:1；Level-one ball milling chamber and second level ball milling
Cavity wall is equipped with several equally distributed convex blocks 7, and the top surface of convex block is equipped with circular groove 8；In level-one ball milling chamber, convex block
The ratio of width and the longer polar radius of ball milling chamber is 1:40, and the height of convex block and the ratio of the longer polar radius of ball milling chamber are 1:
30, the central angle of the circular groove of convex block top surface is 85 °；In second level ball milling chamber, the width of convex block is and the longer pole of ball milling chamber
The ratio of radius is 1:60, and the ratio of the height of convex block and the longer polar radius of ball milling chamber is 1:40, convex block top surface it is arc-shaped
The central angle of groove is 100 °；Convex block is strip, extends to the other end by one section of ball milling chamber polar axis, sets in level-one ball milling chamber
There are 12 convex blocks, is equipped with 8 convex blocks in second level ball milling chamber.
A kind of broken method of efficient permanent magnet ferrite fines realized by dual chamber two-stage ball mill, comprises the steps of,
A) ball milling raw material is added in level-one ball milling chamber, and abrading-ball and water is added, the ratio of ball milling raw material, abrading-ball and water is 1:
5:1.2；Abrading-ball uses diameter for the steel ball of 10mm；
B) it level-one ball milling: is handled 20 minutes with the revolving speed of 30rpm, is then handled counterclockwise 60 minutes with 20rpm revolving speed clockwise；
C) it is handled 8 hours in circulating repetition step b)；
D) valve between level-one ball milling chamber and second level ball milling chamber is opened, using high pressure gas by the material after level-one ball-milling treatment
Slurry is delivered in second level ball milling chamber, and makes the ratio 1:5:1.2 of ball milling raw material, abrading-ball and water, and abrading-ball uses diameter for 4mm's
Steel ball；
E) it second level ball milling: is handled 20 minutes with the revolving speed of 30rpm, is then handled counterclockwise 60 minutes with 20rpm revolving speed clockwise；
F) it is handled 8 hours in circulating repetition step e)；
G) by the slurry pipeline transport obtained after above-mentioned steps are handled to expecting tower.
In addition, new ball milling raw material is added in level-one ball milling chamber while carrying out one while step e) carries out second level ball milling
Grade ball-milling treatment.
Embodiment 4
In embodiment 4 in addition to step c) when permanent-magnet ferrite ball milling is finely divided and f) the circular treatment time be 9 hours other than, other
Equipment, processing step, parameter setting such as use is same as Example 3.
Embodiment 5
In embodiment 5 in addition to step c) when permanent-magnet ferrite ball milling is finely divided and f) the circular treatment time be 10 hours other than,
His equipment, processing step, parameter setting as used is same as Example 3.
Embodiment 6
In addition to the central angle of the circular groove of convex block top surface is 90 ° in level-one ball milling chamber, in second level ball milling chamber in embodiment 6
The central angle of the circular groove of convex block top surface is 120 °, in level-one ball-milling treatment using the diameter 10mm of weight ratio 1:1 and
8mm steel ball as abrading-ball, diameter 6mm and 4mm steel ball in second level ball-milling treatment using weight ratio 1:1 as abrading-ball outside,
His equipment, processing step, parameter setting as used is same as Example 3.
Embodiment 7
In addition to the central angle of the circular groove of convex block top surface is 120 ° in second level ball milling chamber, at second level ball milling in embodiment 7
Diameter 6mm and 4mm steel ball when reason using weight ratio 1:1 as abrading-ball outside, other are such as the equipment, the processing step, parameter that use
It is arranged same as Example 3.
Embodiment 8
In addition to the central angle of the circular groove of convex block top surface is 120 ° in second level ball milling chamber, at second level ball milling in embodiment 8
Diameter 6mm and 4mm steel ball when reason using weight ratio 1:1 as abrading-ball outside, other are such as the equipment, the processing step, parameter that use
It is arranged same as Example 5.
Comparative example 1
Ball mill before being improved using the present invention, with 28 revs/min of revolving speed at the uniform velocity ball milling, ball milling 19h, ball milling raw material, abrading-ball with
The ratio of water is 1:5:1.2；Abrading-ball uses diameter for the steel ball of 10mm.
Comparative example 2
Ball mill before being improved using the present invention, with 28 revs/min of revolving speed at the uniform velocity ball milling, ball milling 21h, ball milling raw material, abrading-ball with
The ratio of water is 1:5:1.2；Abrading-ball uses diameter for the steel ball of 10mm.
Comparative example 3
Ball mill before being improved using the present invention, with 28 revs/min of revolving speed at the uniform velocity ball milling, ball milling 19h, ball milling raw material, abrading-ball with
The ratio of water is 1:5:1.2；Using diameter 10mm and the 8mm steel ball of weight ratio 1:1 as abrading-ball.
Comparative example 4
Ball mill before being improved using the present invention, with 28 revs/min of revolving speed at the uniform velocity ball milling, ball milling 22h, ball milling raw material, abrading-ball with
The ratio of water is 1:5:1.2；Using diameter 10mm and the 8mm steel ball of weight ratio 1:1 as abrading-ball.
Comparative example 5
Using ball mill of the invention, only with level-one ball milling chamber with 28 revs/min of revolving speed at the uniform velocity ball milling, ball milling 22h, remaining technique
It is controlled according to embodiment 3.
By the slurry obtained after above-described embodiment and comparative example ball milling, surveyed after taking the slurry of 00g to dry with laser particle analyzer
Size distribution curve is tried, remaining slurry is evacuated to material tower precipitating, and slurry controls water content after 35%-40%, with 250T magnetic tile by wet pressing
Moulding press compacting, the moulding process of all embodiment comparative examples, molding equipment, agglomerating plant, are kept sintering process curve
Unanimously, for sintered magnetic shoe by testing magnetic property under 23 DEG C of magnetic material test equipment of constant temperature, test data is shown in Table 1.
Table 1
| Number | Ball-milling Time (h) | Slurry D50(µm) | Blank molding time (s) | Integrated yield % | Br(Gs) | Hcb(Oe) | Hcj(Oe) | BH(max) MGOe |
| Embodiment 1 | 12 | 0.94 | 80 | 94.0 | 4210 | 3641 | 3900 | 4.31 |
| Embodiment 2 | 13 | 0.88 | 85 | 93.0 | 4225 | 3655 | 3950 | 4.35 |
| Embodiment 3 | 14 | 0.82 | 89 | 92.0 | 4239 | 3689 | 4010 | 4.39 |
| Embodiment 4 | 15 | 0.80 | 95 | 90.2 | 4252 | 3710 | 4079 | 4.46 |
| Embodiment 5 | 16 | 0.79 | 102 | 88.0 | 4260 | 3740 | 4100 | 4.47 |
| Embodiment 6 | 16 | 0.76 | 96 | 92.0 | 4280 | 3799 | 4230 | 4.51 |
| Comparative example 1 | 16 | 0.83 | 91 | 87.0 | 4230 | 3675 | 3970 | 4.34 |
| Comparative example 2 | 19 | 0.78 | 108 | 83.0 | 4240 | 3600 | 4060 | 4.36 |
| Embodiment 7 | 16 | 0.75 | 96 | 95.0 | 4475 | 4070 | 4790 | 4.99 |
| Embodiment 8 | 17 | 0.74 | 99 | 94.0 | 4510 | 4100 | 4880 | 5.01 |
| Comparative example 3 | 16 | 0.83 | 90 | 88.0 | 4410 | 3864 | 4623 | 4.82 |
| Comparative example 4 | 19 | 0.78 | 107 | 84.0 | 4445 | 3900 | 4705 | 4.87 |
| Comparative example 5 | 19 | 0.77 | 101 | 90.0 | 4479 | 3997 | 4786 | 4.99 |
And its grain size distribution obtained is drawn for embodiment 8 and comparative example 2,5, grain size distribution is as shown in Figure 5.
In terms of 1 performance comparison of Fig. 5 grain size distribution and table, improved ball mill, using the Preburning material of same batch, ball
It is milled to same particle size, there is narrower particle diameter distribution, Ball-milling Time averagely shortens 3~5 hours, and molding time shortens 10%, finished product
Rate improves 10%, and remanent magnetism improves 1%~3%, and intrinsic coercivity improves 3%~5%.
It should be understood that those skilled in the art, can be improved or be become according to the above description
It changes, and all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (10)
1. a kind of dual chamber two-stage ball mill comprising cylinder, bracket and driving mechanism, it is characterised in that:
Ball milling chamber, respectively level-one ball milling chamber and second level ball milling chamber there are two being set in the cylinder, the level-one ball milling chamber and two
Grade ball milling chamber is disposed adjacent, and is connected between level-one ball milling chamber and second level ball milling chamber by valve.
2. a kind of dual chamber two-stage ball mill according to claim 1, it is characterised in that:
The ball milling chamber is elliposoidal ball milling chamber, and two polar radius of the level-one ball milling chamber and the ratio of equatorial radius are
(1.4~3.2): (1.4~3.2): 1, two polar radius of the second level ball milling chamber and the ratio of equatorial radius are (1.2~3):
(1.2~3): 1.
3. a kind of dual chamber two-stage ball mill according to claim 1 or 2, it is characterised in that:
The level-one ball milling chamber and second level ball milling cavity wall are equipped with several equally distributed convex blocks, and the top surface of convex block is equipped with circular arc
Connected in star.
4. a kind of dual chamber two-stage ball mill according to claim 3, it is characterised in that:
In the level-one ball milling chamber, the width of convex block and the ratio of the longer polar radius of ball milling chamber are 1:20~70, the height of convex block
Ratio with the longer polar radius of ball milling chamber is 1:18~50；In the second level ball milling chamber, the width of convex block be with ball milling chamber compared with
The ratio of long polar radius is 1:40~80, and the height of convex block and the ratio of the longer polar radius of ball milling chamber are 1:30~50.
5. a kind of dual chamber two-stage ball mill according to claim 3, it is characterised in that:
The convex block is strip, extends to the other end by one section of ball milling chamber polar axis.
6. a kind of dual chamber two-stage ball mill according to claim 3, it is characterised in that:
The protrusion is the protrusion that bottom surface is square.
7. a kind of broken side of efficient permanent magnet ferrite fines that the dual chamber two-stage ball mill by described in claim 1~6 is realized
Method, it is characterised in that it comprises the steps of,
A) ball milling raw material is added in level-one ball milling chamber, and abrading-ball and ball-milling medium is added；
B) it level-one ball milling: is handled clockwise 50~100 minutes with the revolving speed of 20~35rpm, then with 15~30rpm revolving speed inverse time
Needle is handled 50~100 minutes；
C) it is handled 5~10 hours in circulating repetition step b)；
D) by slurry pipeline transport obtained after level-one ball-milling treatment into second level ball milling chamber；
E) it second level ball milling: is handled clockwise 50~100 minutes with the revolving speed of 20~35rpm, then with 15~30rpm revolving speed inverse time
Needle is handled 50~100 minutes；
F) it is handled 5~10 hours in circulating repetition step e)；
G) by the slurry pipeline transport obtained after above-mentioned steps are handled to expecting tower.
8. a kind of broken method of efficient permanent magnet ferrite fines according to claim 7, it is characterised in that:
The step d), will be through one using high pressure gas specifically, open the valve between level-one ball milling chamber and second level ball milling chamber
Slurry pipeline transport after grade ball-milling treatment is into second level ball milling chamber.
9. a kind of broken method of efficient permanent magnet ferrite fines according to claim 7, it is characterised in that:
The abrading-ball that the step b) level-one ball milling uses is the steel ball of 7~11mm of diameter；What the step e) second level ball milling used
Abrading-ball is the steel ball of 3.5~8mm of diameter.
10. a kind of broken method of efficient permanent magnet ferrite fines according to claim 7, it is characterised in that:
While step e) carries out second level ball milling, new ball milling raw material is added in level-one ball milling chamber while carrying out at level-one ball milling
Reason.
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