CN106694187A - Cement semi-finish grinding system with steady flow metering device - Google Patents
Cement semi-finish grinding system with steady flow metering device Download PDFInfo
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- CN106694187A CN106694187A CN201510448494.4A CN201510448494A CN106694187A CN 106694187 A CN106694187 A CN 106694187A CN 201510448494 A CN201510448494 A CN 201510448494A CN 106694187 A CN106694187 A CN 106694187A
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- current stabilization
- storehouse
- stabilization storehouse
- grinding
- skewed slot
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention relates to a cement semi-finish grinding system, in particular to a cement semi-finish grinding system with a steady flow metering device. According to the cement semi-finish grinding system with the steady flow metering device, a first metering balance is arranged below a first steady flow bin and is connected to an inlet of a ball grinder through a third conveying tilted trough; a material overflow port is formed in the middle of the first steady flow bin and is connected to a second steady flow bin through a fourth conveying tilted trough; a second metering balance is arranged below a second steady flow bin and is connected to a feed port of a pre-grinding device; materials from a batching station are fed into the second steady flow bin; materials of the second steady flow bin are quantificationally fed into the pre-grinding device through the second metering balance and are ground into powdery materials by the pre-grinding device; and the powdery materials are fed into a V-shaped powder concentrator and a fine powder concentrator for powder selection in twice by a bucket elevator. The cement semi-finish grinding system with the steady flow metering device has the beneficial effects that the cement semi-finish grinding system is stable in operation, and particularly, the stable operation of the two core grinding devices of the system is realized.
Description
Technical field
The present invention relates to a kind of final grinding system of cement half, particularly with the water of current stabilization metering device
The final grinding system of mud half.
Background technology
In cement grinding field, tube mill is low due to capacity usage ratio and mill efficiency, in energy-conservation
Grinding aspect is progressively replaced by efficient bed of material milling equipment.Vertical Mill, roll squeezer are bed of material powder
Mill equipment, mill efficiency is higher.Vertical Mill, roll squeezer pregrinding system are currently cement grinding skill
The main flow of art, on the basis of ball mill, realization significantly puies forward product and energy-conservation.It is particularly near
Several years, the country started the whole grinding agitation of one cement half, in the base of cement Joint grinding system
On plinth, cement grinding system realize again amplitude it is larger carry product, grinding pow consumption is reduced again.
Bed of material grinding device has a fatal weakness compared with ball mill, and either roll squeezer is also
It is Vertical Mill, the stable type of operation is poorer than ball mill, is influenceed larger by material, the bed of material, pressure etc.,
When material feeding is uneven or feeding granularity, moisture content etc. are improper, bed of material grinding device meeting
Vibrate, influence the stability of system, system stop jumping is caused when serious, to equipment in itself
Damaging influence is produced, the normal production of cement is not only influenceed, bed-grinding device is also reduced
Service life.
With the development of bed of material grinding technology, bed of material milling equipment joins with the cement of ball mill composition
Grinding or half final grinding system are closed, yield is being improved constantly, and grinding pow consumption is constantly being reduced, special
It is not the final grinding system of cement half for developing prevalence in recent years, is realized on the basis of protocorm grinding machine
About 2 times put forward product effect, and grinding pow consumption is down to below 27kWh/t.Realize so significantly
Carry product and consumption reduction, system stable operation is particularly significant, particularly the stabilization of bed of material milling equipment
Operation is more important.The current final grinding system application of cement half it is more be the whole powder of roll squeezer half
Grinding system, in order to ensure the stable operation of roll squeezer, roll squeezer top is designed with current stabilization storehouse, comes
The material ensured into roll squeezer realizes uniform feeding, is realized by the position in storehouse in current stabilization storehouse, but
When proportioning station supplied materials fluctuates, the powder granularity for going out roll squeezer can change, aidr bells blast system
Also have little time adjustment, the circulating load of roller press grinding system has occurred and that change, so as to cause
Current stabilization position in storehouse is lost control of, and roll squeezer throughput changes therewith, and ripple occurs so as to cause roll squeezer
It is dynamic even to vibrate.
In addition, in the final grinding system of cement half, the powder after bed of material grinding selects powder by V-type
After machine, fine powder concentrator select powder, the fine powder selected of fine powder concentrator is finished cement, meal
Or middle meal is fed directly into ball mill, ball mill is typically directly connected to by blanking scraper-trough conveyer or skewed slot
Bistrique spout.Product is significantly carried with Ball Mill System, ball mill milling capacity is substantially real
Now maximize, once ball mill feeding fluctuates, either open system or closed-circuit system,
Grinding situation in ball mill fluctuates；When ball mill is open system, feeding granularity
During thicker or big feeding quantitative change, the cement fineness for grinding can run slightly, so as to influence the performance of cement；
When ball mill is closed-circuit system, feeding granularity is thicker or during big feeding quantitative change, can cause circulation
Load is changed, and then powder system is selected in influence, causes cement granularity to be sent out with grinding efficiency respectively
Changing, can also influence cement performance.
It can be seen that control roll squeezer is to realize that half final grinding system is high with the feeding capacity stabilization of ball mill
Produce the key of low energy consumption.The final grinding system of Vertical Mill half there is also same problem, Vertical Mill feeding capacity,
Thickness of feed layer and the stabilization of raw meal particle size composition in mill, play key to the stable operation of Vertical Mill
Effect.Only former and later two grindings of system equipment realizes stable operation, and system could realize height
Effect grinding with it is energy-saving.In order to stablize two chargings of grinding equipment, carry out quantitative current stabilization and feed
Material is critical technical measures.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of stable, particularly realize system
Two whole powder of the cement with current stabilization metering device of the stable operation of core grinding device half in system
Grinding system.
In order to solve the above technical problems, the present invention is realized as follows：Design a kind of band
The final grinding system of cement half of current stabilization metering device, it includes pre- grinding device, bucket elevator, V
It is type powder concentrator, fine powder concentrator, dust-precipitator, blower fan, conveying skewed slot, ball mill, second defeated
Send skewed slot, it is characterised in that：Also include the first current stabilization storehouse, the second current stabilization storehouse, the first current stabilization storehouse
Lower section sets the first weigher, and the first weigher is sequentially connected the 3rd conveying skewed slot, ball mill and enters
Material mouth, the first current stabilization storehouse middle part sets material overfall, is sequentially connected the 4th by overfall defeated
Send skewed slot, the second current stabilization storehouse, the second current stabilization storehouse lower section that the second weigher, the second weigher are set
(15) it is connected with pre- grinding device charging aperture.
Pre- grinding device, bucket elevator, V-type powder concentrator, the second current stabilization storehouse, the second weigher group
Into a closed-circuit system；
Pre- grinding device, bucket elevator, V-type powder concentrator, fine powder concentrator, the second current stabilization storehouse,
Second weigher constitutes a closed-circuit system；Pre- grinding device, bucket elevator, V-type powder concentrator,
Fine powder concentrator, the first current stabilization storehouse, the 4th conveying skewed slot, the second current stabilization storehouse, the second weigher
One closed-circuit system of composition.
The first current stabilization storehouse is made up of two parts, i.e. cylindrical portion and conical section, cylinder
Body portion is part on the first current stabilization storehouse, and conical section is part, the first current stabilization storehouse under current stabilization storehouse
There are two discharge ports, a discharge port is located at orlop, and a discharge port is that flash mouthful 101 is located at storehouse middle part.
Material in first current stabilization storehouse supplies ball mill first, when ball mill realizes stabilization grinding production
When, when can't the supplies consumption in the first current stabilization storehouse be fallen, position in storehouse in the first current stabilization storehouse can be by
Step is raised, and when the overfall in the middle part of current stabilization storehouse is risen to, material will by the 4th conveying skewed slot
Material is delivered to the second current stabilization storehouse, is then delivered to pre- grinding device by the second weigher again.
The fine powder concentrator is three composition dividing powder separating machine, and charging air inlet goes out with V-type powder concentrator
Air port is connected, and fine powder discharging air outlet is connected with dust-precipitator, middle meal discharging opening and the first current stabilization
Storehouse is connected, and meal discharging opening is connected with the second current stabilization storehouse.The fine powder of V-type powder concentrator is with selecting powder
Wind enters fine powder concentrator, and material one dividing into three is divided into meal, middle meal, fine powder, meal
Pass sequentially through the second current stabilization storehouse, the pre- grinding device of the second weigher return and be circulated grinding, in
Meal pass sequentially through the first current stabilization storehouse, the first weigher, the 3rd conveying skewed slot enter into ball mill
It is prepared by row cement grinding.
The second current stabilization storehouse, bucket elevator, V-type powder concentrator, fine powder concentrator, the first current stabilization
Storehouse, the first weigher, the 3rd conveying skewed slot, ball mill, the second conveying skewed slot are sequentially connected in series,
Meal is returned into pre- grinding device and is circulated grinding, do not allow it to enter ball mill, given full play to
The respective advantage that pre- grinding device grinds to coarse grained efficient grinding and ball mill to fine grained；
The fine powder of pre- grinding device directly elects finished cement as, does not enter back into ball mill, prevents from forming material
Pad is acted on, and prevents grinding phenomenon.
The highness change of discharge port and the ball mill import of the 3rd conveying skewed slot 1 meter with
It is interior, prevent material from slug phenomenon occurring when entering ball mill, give full play to each section of grinding of ball mill and make
With, particularly two storehouses mill, once there is the compartment Board position of slug, particularly slug to a storehouse
When, a storehouse does not work substantially, and whole materials are only ground by two storehouses, the grinding of ball mill
Effect can weaken.
The positive effect of the present invention：In technical solution of the present invention, pre- grinding dress is given full play to first
The high-efficient grinding function of the efficient grinding put and ball mill to fine powder so that the mill efficiency of system
It is higher, so as to reduce the grinding energy of system；Secondly, pre- grinding device, ball mill top are equal
Current stabilization storehouse is set so that two feeding stabilizations of grinding device；Current stabilization storehouse lower section sets metering again
Scale, quantitatively can carry out feeding to two grinding devices, and realization is more stably fed, from
And the stable operation of system is realized, the respective yield of pre- grinding device and ball mill can also be determined
(or material handling capacity)；Again, after fine powder concentrator being connected on into V-type powder concentrator, and set
Be three separation functions, rationally give full play to two functions of grinding device, both realized bulk with it is thick
The efficient grinding of powder material, again realize in meal ball mill high-efficient grinding, also in advance by pre- powder
The fine powder of mill apparatus is selected as finished product, while system throughput is improved, also reduces ball milling
The burden of machine, turn avoid fine powder and grinding phenomenon and backing strap effect occurred in ball mill, significantly
The grinding efficiency of ball mill is improve, so as to further improve system throughput, system grinding is reduced
Energy consumption；Finally, the first current stabilization storehouse sets overfall at middle part, realizes meal in fine powder concentrator
The primary and secondary direction of shunting, first meets the grinding amount of ball mill, remaining to return again to pre-grinding vertical,
So ball mill output is realized to maximize, so as to realize the maximization of system throughput, is beneficial to
The product that carries of system lowers consumption.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below
The accompanying drawing to be used needed for embodiment or description of the prior art will be briefly described, show and
Easy insight, drawings in the following description are only some embodiments of the present invention, for this area
For those of ordinary skill, do not pay create it is laborious on the premise of, can also be according to these
Accompanying drawing obtains other accompanying drawings.
Fig. 1 is the structural representation of embodiment of the present invention
Fig. 2 is the structural representation of embodiment of the present invention
Fig. 3 is the structural representation of embodiment of the present invention
Fig. 4 is the structural representation of embodiment of the present invention
Fig. 5 is the structural representation of embodiment of the present invention
In figure, the bucket elevator 3V type powder concentrators of 1 pre- grinding device 2
The meal discharging opening of meal discharging opening 42 in 4 fine powder concentrators 41
The blower fan of 5 dust-precipitator 6
The feed inlet of globe mill of 78 ball mill of conveying skewed slot 81
The overfall of 9 second 10 first current stabilization storehouse of conveying skewed slot 101
The conveying conveying skewed slot of skewed slot 13 the 4th of 11 first weigher 12 the 3rd
The mixing device of 14 second 15 second weigher of current stabilization storehouse 16
Specific embodiment
In order that the object, technical solutions and advantages of the present invention become more apparent, with reference to
Specific embodiment and accompanying drawing, are described in further details to the present invention.Here, of the invention
Exemplary embodiment and its illustrate for explaining the present invention, but be not intended as to limit of the invention
It is fixed.
Such as Fig. 1, a kind of final grinding system of cement half with current stabilization metering device, including pre- grinding
Device 1, bucket elevator 2, V-type powder concentrator 3, fine powder concentrator 4, dust-precipitator 5, blower fan 6,
Conveying skewed slot 7, the conveying skewed slot 9 of ball mill 8, second, also including the first current stabilization storehouse 10, the
Two current stabilization storehouses 14, the lower section of the first current stabilization storehouse 10 sets the first weigher 11, the first weigher
11 are sequentially connected the 3rd conveying skewed slot 12, the charging aperture 81 of ball mill 8, the first current stabilization storehouse 10
Middle part sets material overfall 101, by overfall 101 be sequentially connected the 4th conveying skewed slot 13,
Second current stabilization storehouse 14, the lower section of the second current stabilization storehouse 14 sets the second weigher 15, the second weigher
15 are connected with the charging aperture of pre- grinding device 1.
Pre- grinding device 1, bucket elevator 2, V-type powder concentrator 3, the second current stabilization storehouse 14, second
Weigher 15 constitutes a closed-circuit system；Pre- grinding device 1, bucket elevator 2, V-type powder concentrator
3rd, fine powder concentrator 4, the second current stabilization storehouse 14, the second weigher 15 constitute a closed-circuit system；
Pre- grinding device 1, bucket elevator 2, V-type powder concentrator 3, fine powder concentrator 4, the first current stabilization storehouse
10th, the 4th conveying skewed slot 13, the second current stabilization storehouse 14, the composition of the second weigher 15 one are closed circuit
System.
Used as a modification of the present invention scheme, the first current stabilization storehouse 10 is made up of two parts, circle
Columnar part and pyramidal portion, cylindrical portion are part, centrum portion on the first current stabilization storehouse 10
It is divided into part under current stabilization storehouse, the first current stabilization storehouse 10 there are two discharge ports, and a discharge port is located at orlop,
One discharge port is that flash mouthful 101 is located at storehouse middle part.
As a modification of the present invention scheme, Fig. 2 is seen, fine powder concentrator 4 is three separation choosings
Powder machine, charging air inlet be connected with the air outlet of V-type powder concentrator 3, fine powder discharge air outlet and
Dust-precipitator 5 is connected, and middle meal discharging opening 41 is connected with the first current stabilization storehouse (10), meal discharging
Mouth 42 is connected with the second current stabilization storehouse 14.
Material from proportioning station feeds the second current stabilization storehouse 14, the material in the second current stabilization storehouse 14
Pre- grinding device 1 is quantitatively fed by the second weigher 15, by the powder of pre- grinding device 1
Granular material is worn into, then V-type powder concentrator 3, fine powder concentrator 4 is fed by bucket elevator 2,
Connected twice and selected powder；The fine powder of V-type powder concentrator 3 brings fine powder concentrator 4 into by wind, slightly
Powder enters the second current stabilization storehouse 14；Fine powder concentrator 4 is the three fine powder concentrators of separation, fine powder quilt
Elect finished cement as, be designated as cement products A, meal enters the second current stabilization storehouse 14, middle meal
Into the first current stabilization storehouse 10；A material part in first current stabilization storehouse passes sequentially through the first current stabilization
The conveying of storehouse the 10, the 4th feeding ball mill of skewed slot 13, is processed into finished cement, is designated as cement product
Product B, a part of material is circulated grinding by overfall 101 into pre- grinding device 1.
As another improvement project of the invention, the second current stabilization storehouse 14, bucket elevator 2, V-type
Powder concentrator 3, fine powder concentrator 4, the first current stabilization storehouse 10, the first weigher the 11, the 3rd are conveyed
Skewed slot 12, the conveying skewed slot 9 of ball mill 8, second are sequentially connected in series, and go out the material of pre- grinding device
After V-type powder concentrator 3 is connected with fine powder concentrator 4 and selects powder, by lump material and meal
Return to pre- grinding device 1 and be circulated grinding, do not allow it to enter ball mill 8, give full play to pre-
The efficient grinding of grinding device 1 grinds the respective advantage of fine powder with ball mill 8；Pre- grinding device
1 fine powder directly elects finished cement as, and ball mill 8 is not entered back into, prevents from forming backing strap and going out
Now cross grinding phenomenon.
As another improvement project of the invention, Fig. 3 is seen, the 3rd conveys unloading for skewed slot 12
The highness change of material mouth and the charging aperture 81 of ball mill 8 within 1 meter, i.e., in figure shown in black matrix
Scraper-trough conveyer vertical height it is high preferably not more than 1 meter, if engineering will set in practice more than 1 meter
Put buffering scraper-trough conveyer or take anti-slug measure, prevent material from slug occurring when entering ball mill 8 and show
As, 8 each sections of abrasive actions of ball mill, particularly two storehouses or three-chamber mill are given full play to, once hair
Raw slug, particularly slug to a storehouse compartment Board position when, a storehouse does not work substantially, ball
The abrasive action of grinding machine can weaken.
As another improvement project of the invention, Fig. 4 is seen, convey the cement products of skewed slot 7
The cement products B of the conveying skewed slots 9 of A and second enters powder material mixing arrangement 16 jointly,
It is well mixed in mixing arrangement 16, to ensure the cement composition and final water of mix designs
Mud composition is consistent.
Used as another change of the invention, such as Fig. 5, the material from proportioning station is sent directly into
Pre- grinding device 1, V-type powder concentrator 3, fine choosing are fed after carrying out grinding by bucket elevator 2
Powder machine 4, carry out powder and select powder to be classified, the meal of V-type powder concentrator 3, fine powder concentrator 4
Meal enters the second current stabilization storehouse 14, and the middle meal of fine powder concentrator 4 is by the first current stabilization storehouse 10
Flash mouthfuls 101 enters the second current stabilization storehouse 14, the mixed material in the second current stabilization storehouse 14 with come from
The material of proportioning station converges and grinding in pre- grinding device 1.
Claims (6)
- The 1. final grinding system of cement half with current stabilization metering device, including pre- grinding device (1), Bucket elevator (2), V-type powder concentrator (3), fine powder concentrator (4), dust-precipitator (5), blower fan (6), Conveying skewed slot (7), ball mill (8), the second conveying skewed slot (9), it is characterised in that：Also include the One current stabilization storehouse (10), the second current stabilization storehouse (14), the first current stabilization storehouse (10) lower section set first and measure Scale (11), the first weigher (11) is sequentially connected the 3rd conveying skewed slot (12), ball mill (8) charging Mouth (81), the first current stabilization storehouse (10) middle part sets material overfall (101), by overfall (101) It is sequentially connected the 4th conveying skewed slot (13), the second current stabilization storehouse (14), the second current stabilization storehouse (14) lower section Second weigher (15) is set, and the second weigher (15) is connected with pre- grinding device (1) charging aperture； The pre- grinding device (1), bucket elevator (2), V-type powder concentrator (3), the second current stabilization storehouse (14), Second weigher (15) constitutes a closed-circuit system；The pre- grinding device (1), bucket elevator (2), V-type powder concentrator (3), fine powder concentrator (4), the second current stabilization storehouse (14), the second weigher (15) One closed-circuit system of composition；The pre- grinding device (1), bucket elevator (2), V-type powder concentrator (3), Fine powder concentrator (4), the first current stabilization storehouse (10), the 4th conveying skewed slot (13), the second current stabilization storehouse (14), the second weigher (15) constitutes a closed-circuit system.
- 2. the final grinding system of cement half with current stabilization metering device as claimed in claim 1, its It is characterised by：First current stabilization storehouse (10) is made up of two parts, cylindrical portion and conical section, Cylindrical portion is part on the first current stabilization storehouse (10), and conical section is part under current stabilization storehouse, There are two discharge ports in first current stabilization storehouse (10), and a discharge port is located at orlop, and a discharge port is flash Mouth (101) is positioned at storehouse middle part.
- 3. the final grinding system of cement half with current stabilization metering device as claimed in claim 1, its It is characterised by：Fine powder concentrator (4) is three composition dividing powder separating machine, and charging air inlet selects powder with V-type Machine (3) air outlet is connected, and fine powder discharging air outlet is connected with dust-precipitator (5), middle meal discharging opening (41) it is connected with the first current stabilization storehouse (10), meal discharging opening (42) is connected with the second current stabilization storehouse (14).
- 4. the final grinding system of cement half with current stabilization metering device as claimed in claim 1, its It is characterised by：Second current stabilization storehouse (14), bucket elevator (2), V-type powder concentrator (3), finely select powder Machine (4), the first current stabilization storehouse (10), the first weigher (11), the 3rd conveying skewed slot (12), ball milling Machine (8), the second conveying skewed slot (9) are sequentially connected in series.
- 5. the final grinding system of cement half with current stabilization metering device as claimed in claim 1, its It is characterised by：The discharge port of the 3rd conveying skewed slot (12) and difference in height≤1 of ball mill import Rice.
- 6. the final grinding system of cement half with current stabilization metering device as claimed in claim 1, its It is characterised by：Batch mixing dress is also associated between conveying skewed slot (7) and the second conveying skewed slot (9) Put (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510448494.4A CN106694187B (en) | 2015-07-27 | 2015-07-27 | Half final grinding system of cement with current stabilization metering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510448494.4A CN106694187B (en) | 2015-07-27 | 2015-07-27 | Half final grinding system of cement with current stabilization metering device |
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| Publication Number | Publication Date |
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| CN106694187A true CN106694187A (en) | 2017-05-24 |
| CN106694187B CN106694187B (en) | 2019-02-05 |
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| CN201510448494.4A Active CN106694187B (en) | 2015-07-27 | 2015-07-27 | Half final grinding system of cement with current stabilization metering device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107350062A (en) * | 2017-08-21 | 2017-11-17 | 天津水泥工业设计研究院有限公司 | A kind of powder concentrator external Vertical Mill Joint grinding system using non-metal grinding medium |
| CN108160292A (en) * | 2017-12-28 | 2018-06-15 | 宜宾市天顺建材集团股份有限公司 | A kind of grinding device and grinding method |
| CN109513515A (en) * | 2019-01-08 | 2019-03-26 | 中建材（合肥）粉体科技装备有限公司 | A kind of system being used to prepare desulfurization mountain flour |
| CN112473995A (en) * | 2020-11-30 | 2021-03-12 | 南京凯盛国际工程有限公司 | Improved raw material roller press final grinding system and technological process thereof |
| CN113457816A (en) * | 2021-07-01 | 2021-10-01 | 厦门艾思欧标准砂有限公司 | System and process for preparing spheroidized powder by adopting vertical grinding machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109513515A (en) * | 2019-01-08 | 2019-03-26 | 中建材（合肥）粉体科技装备有限公司 | A kind of system being used to prepare desulfurization mountain flour |
| CN112473995A (en) * | 2020-11-30 | 2021-03-12 | 南京凯盛国际工程有限公司 | Improved raw material roller press final grinding system and technological process thereof |
| CN112473995B (en) * | 2020-11-30 | 2024-05-28 | 中材国际智能科技有限公司 | Improved raw material roller press final grinding system and process flow thereof |
| CN113457816A (en) * | 2021-07-01 | 2021-10-01 | 厦门艾思欧标准砂有限公司 | System and process for preparing spheroidized powder by adopting vertical grinding machine |
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| CN106694187B (en) | 2019-02-05 |
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