CN104844043B - A kind of method and its device for producing high-activity mineral material - Google Patents
A kind of method and its device for producing high-activity mineral material Download PDFInfo
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- CN104844043B CN104844043B CN201510174997.7A CN201510174997A CN104844043B CN 104844043 B CN104844043 B CN 104844043B CN 201510174997 A CN201510174997 A CN 201510174997A CN 104844043 B CN104844043 B CN 104844043B
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Abstract
The present invention relates to material processing field, more particularly to a kind of method and its device for producing high-activity mineral material.A kind of method for producing high-activity mineral material, comprises the following steps：Raw mineral materials is ground into mineral powder, the particle diameter of mineral powder is less than 200 μm；Mineral powder is calcined, the mineral powder after calcining obtains high-activity mineral material through cooling.This method uses the technique of calcine after grind, and mineral material first is crushed into less than 200 μm, then is calcined, and because feed powder particle is tiny, can greatly shorten firing time, improve the thermal efficiency, significantly improves unit volume yield, and quality is burnt till in raising；The active coefficient of high-activity mineral material of production is high, and water requirement is low, and appearance luster is good, the series of advantages such as particle sphericity height；Experiment proves that properties of product are better than second class powered coal ash, it is with a wide range of applications.The related device of offer realizes the requirement of production well.
Description
Technical field
The present invention relates to material processing field, in particular to a kind of method for producing high-activity mineral material and its
Device.
Background technology
Using the very long history of the raw mineral materials such as coal ore, shale production high-activity mineral material, forefathers are also to this
Substantial amounts of research has been done, but so far, has not researched and developed a kind of efficient production technology and facility.Mostly it is Yin Jian
With regard to plain produced；Production method substantially has two kinds at present, and one kind is outdoor heap roasting, and another kind is calcined using shaft furnace,
Both of which exist burn till it is of poor quality, the problem of low production efficiency.
In view of this, it is special to propose the present invention.
The content of the invention
The first object of the present invention is to provide a kind of method for producing high-activity mineral material, and this method is directed to existing life
The weak point of production method, a kind of brand-new production technology being researched and developed, the production technology has efficiency high, and technique is simple,
The advantages that easily operation is grasped, burns till good product quality, better than conventional production methods.
The second object of the present invention is to provide a kind of device of described method, and the device has equipment few easy workout part,
The advantages that easily operation is grasped.
In order to realize the above-mentioned purpose of the present invention, spy uses following technical scheme：
A kind of method for producing high-activity mineral material, comprises the following steps：
Raw mineral materials is ground into mineral powder, the particle diameter of the mineral powder is less than 200 μm；
The mineral powder is calcined, the mineral powder after calcining obtains high-activity mineral material through cooling.
The method of production high-activity mineral material provided by the invention, using the technique of calcine after grind, first by mineral material
Less than 200 μm are crushed to, then is calcined, because feed powder particle is tiny, firing time can be greatly shortened, improve the thermal efficiency,
Unit volume yield is significantly improved, quality is burnt till in raising.The high-activity mineral material of this method production, active coefficient is high,
Water requirement is low, and appearance luster is good, the series of advantages such as particle sphericity height.Experiment proves that properties of product are better than two level fine coal
Ash, it is with a wide range of applications.
Further, the raw mineral materials is with SiO2、Al2O3For the natural minerals of main component.
Preferably, the temperature of the calcining is 500 DEG C -700 DEG C.As calcining temperature can be 500 DEG C, 550 DEG C, 600
DEG C, 650 DEG C, 700 DEG C etc..Mineral powder forms vitreum, the particle surface affected by force under suspended state, production through the high temperature
Raw to shrink the high-activity mineral material for forming almost spherical body, mixing the concrete of high-activity mineral material provided by the invention needs
Water is low, and mobility improves.
Further, the SiO in the raw mineral materials chemical composition2Percetage by weight be 50%-80%, Al2O3Weight
Amount percentage is 10%-30%.
Specifically, the raw mineral materials is any of gangue, shale, sandstone, clay or a variety of.
The high-activity mineral material finally given includes mineral admixture or the activity used in concrete or manufacture of cement
Mixing material.
In order to shorten firing time, it is preferable that the mineral powder is first preheated before calcination.
In order to save the energy, it is preferable that calcine the heat of recovery described in the thermal source of the preheating.
Preferably, the mineral powder is calcined with the state to suspend.Mineral powder is under suspended state in vertical tube stove
Heat exchange is carried out, feed powder is heated evenly, burns till quality and significantly improve.
Present invention also offers the device for the method for implementing the production high-activity mineral material, including：Vertical tube calcining furnace,
Combustion furnace, dust-precipitator, air-introduced machine；
Charging aperture is provided with the top of the vertical tube calcining furnace, bottom and the combustion furnace of the vertical tube calcining furnace connect
It is logical；
Economizer bank is provided with the vertical tube calcining furnace, the economizer bank is extended in the combustion furnace；
The vertical tube calcining furnace is connected with the dust-precipitator by pipeline；The air-introduced machine is connected with the dust-precipitator.
Device provided by the invention, mineral powder enter vertical tube calcining furnace by charging aperture, mineral powder during sinking,
It is fully warmed-up using economizer bank, adds the heat exchanger time of mineral powder, it is ensured that is burnt till quality, while reduce vertical tube calcining
The design height of stove；Combustion furnace provides high temperature gas flow for vertical tube calcining furnace, makes mineral powder after economizer bank is fully warmed-up in vertical tube
Burnt till in calcining furnace with the state of suspension；Air-introduced machine makes to be in negative pressure state, the mineral powder after burning till in vertical tube calcining furnace
Into in dust-precipitator, the calcined product in dust-precipitator is collected, that is, obtains high-activity mineral material.
Preferably, the bottom of the economizer bank is provided with striker plate.The bottom of economizer bank sets striker plate, preferably to divide
Mineral powder is dissipated, mineral powder is fully burned, improves product quality.
Preferably, described device also includes feed bin, meter and discharger；
The feed bin is connected with the meter, and the discharger is connected with the charging aperture, and the meter is used to control
Make the dosage that the mineral powder in the feed bin enters the discharger.
Raw mineral materials flour mill grinding to defined fineness, obtains mineral powder, the boosted machine of mineral powder through crusher in crushing
Feed bin is delivered to, then conveys material feeding and discharging machine (such as air valve) through meter (such as spiral metering reamer), then mineral powder passes through
Charging aperture enters vertical tube calcining furnace.During being somebody's turn to do, meter controls the injected volume of mineral powder, ensures the quality of calcining, realizes certainly
Dynamicization operates.
Preferably, the dust-precipitator includes gravity dust-precipitator, rotoclone collector and bagroom, the rotoclone collector
Connected with the discharger, the bagroom is connected with the rotoclone collector, the air-introduced machine and the bag collection
Device connects；
The gravity dust-precipitator is connected with the top of the vertical tube calcining furnace.
Wherein, rotoclone collector is used for collection by the mineral material preheated, the discharger being then sent on calcining furnace, from
And enter calcining furnace in calcine, gravity dust-precipitator collect calcined product, so as to get product it is purer, improve product quality.
Meanwhile using dust-precipitator gas waste-heat, mineral powder is preheated, the thermal efficiency can be improved, is lowered into the gas of bagroom
Temperature is flowed, to ensure bagroom normal operation.
Preferably, the pipeline between the feed bin and the rotoclone collector connects with the gravity dust-precipitator.So, weight
Waste heat in power dust-precipitator is used to preheat the mineral powder entered, saves the energy, and reduces the time that calcining needs.
Preferably, it is additionally provided with the first cooler between the gravity dust-precipitator and the vertical tube calcining furnace.First cooling
Device is used to be cooled down calcined product, and it is 400 DEG C or so to make the mineral powder after calcining, typically between 380-450 DEG C, realizes
The rapid cooling of product is burnt till, improves product quality.
Preferably, the bottom of the gravity dust-precipitator is provided with the second cooler.Second cooler is by the mineral after calcining
Powder temperature is reduced to less than 100 DEG C.The firing system of the present invention is by equipped with two level cooling system, being advantageous to burn till the quick of material
Cooling, the vitreum content of calcined product is improved, reduce the water requirement of product, product quality greatly improves.
Preferably, waste heat caused by first cooler is passed through in the combustion furnace.The recovered entrance of cooler waste heat
Coal dust furnace, the thermal efficiency is improved, save the energy.
Preferably, the vertical tube calcining furnace is additionally provided with temperature control system.The present invention is provided with temperature control system, can realize
Quality is burnt till in the accurate control of firing temperature, raising.
Flow direction of material in device provided by the invention is generally：
--- spiral measures reamer --- rotoclone collector --- economizer bank --- vertical tube calcining furnace --- the to raw material feed bin
One cooler --- gravity dust catcher --- the second cooler --- finished product.
Air flow direction is generally：
Cold air --- the first cooler --- coal dust furnace --- vertical tube calcining furnace --- the first cooler --- weight
Power dust catcher --- cyclone preheater --- bagroom --- air-introduced machine.
Technique provided by the invention uses calcine after grind technique, and conventional method is using grinding process after first calcining.
Compared with prior art, beneficial effects of the present invention are：
(1) mineral powder is under suspended state in vertical tube calcining furnace and carries out heat exchange, and feed powder is heated evenly, and burns till quality
Significantly improve.
(2) because feed powder particle is tiny, firing time can be greatly shortened, significantly improves kiln unit volume yield.
(3) feed powder particle forms vitreum through high temperature, the particle surface affected by force under suspended state, produces and shrinks shape
Into almost spherical body, therefore, mix that the concrete water requirement of the high-activity mineral material of this technique productions is low, and mobility improves.
(4) firing system in the present invention is furnished with two level cooling system, is advantageous to burn till the quick cooling of material, improves and forge
The vitreum content of burning, be advantageous to improve product fluidity, reduce the water requirement of product, product quality greatly improves.
(5) production technology of the present invention and facility can accurately realize the control of firing temperature, and mineral material is in specific temperature
Under the conditions of, burn out the high-activity mineral material of high activity, the high-activity mineral material activity coefficient of production technology production shows
Write and improve.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the device for the implementation production high-activity mineral MATERIALS METHODS that the embodiment of the present invention 1 provides；
Fig. 2 is the structural representation of the device for the implementation production high-activity mineral MATERIALS METHODS that the embodiment of the present invention 2 provides；
Reference：
1- vertical tube calcining furnaces；2- combustion furnaces；3- dust-precipitators；
4- air-introduced machines；5- temperature-indicating instruments；6- charging apertures；
7- economizer banks；8- dischargers；9- meters；
10- feed bins；11- rotoclone collectors；12- bagrooms；
13- gravity dust-precipitators；The coolers of 14- first；The coolers of 15- second；
16- striker plates.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify description, rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that instruction or hint relative importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
Embodiment 1
In order to verify the feasibility of production technology of the present invention and facility, applicant spy has built an experiment kiln, has tested kiln
The structure of stove is shown in Fig. 1.Implementing the device of the method for production high-activity mineral material includes vertical tube calcining furnace 1, combustion furnace 2, gathers dust
Device 3, air-introduced machine 4, temperature-indicating instrument 5, charging aperture 6, the bottom of vertical tube calcining furnace 1 and burning is provided with the top of vertical tube calcining furnace
Stove 2 connects；Economizer bank 7 is provided with vertical tube calcining furnace 1, economizer bank 7 is extended in combustion furnace 2.
Raw mineral materials is grinding to obtain mineral powder, and mineral powder enters vertical tube calcining furnace 1 by charging aperture 6, and mineral powder is under
In heavy process, it is fully warmed-up using economizer bank 7, adds the heat exchanger time of mineral powder, it is ensured that is burnt till quality, drop simultaneously
The low design height of vertical tube calcining furnace 1；Combustion furnace 2 is that vertical tube calcining furnace 1 provides high temperature gas flow, makes mineral powder in economizer bank 7
Burnt till after being fully warmed-up in vertical tube calcining furnace 1 with the state of suspension；Air-introduced machine 4 makes to be in negative pressure in vertical tube calcining furnace 1
State, the mineral powder after burning till enter in dust-precipitator 3, collect the calcined product in dust-precipitator 3, that is, obtain high-activity mineral material
Material.The high-activity mineral material of this method production, active coefficient is high, and numerical value is between 0.7-0.8；Water requirement is low, outward appearance
Color and luster is good, in Dark grey, the series of advantages such as particle sphericity height.Experiment proves that properties of product are better than second class powered coal ash, tool
Have wide practical use.
Mineral powder is produced into high-activity mineral material using Fig. 1 device.
(1) experimental procedure is as follows：
1) it is the laboratory mill in 10kg gangues laboratory is levigate, make sample when being screened using 45 μm of cribellums, surplus
Less than 25%, obtained sample number into spectrum is 0#.
2) firewood is placed in combustion furnace 2, air-introduced machine 4 is opened after lighting.Treat that the temperature of temperature measuring set measure reaches 500
DEG C when, immediately begin to feed intake, and keep 500 ± 10 DEG C of firing temperature, air-introduced machine 4, the sample that will be burnt till closed after the about 3kg that feeds intake
Taken out from rotoclone collector 3, obtained sample number into spectrum is 1#.
3) air-introduced machine 4 is opened, is continuously heating to 600 DEG C, after the 3kg that feeds intake, closes air-introduced machine 4, is by sample taking-up numbering
2#。
4) blower fan 4 is opened, feed intake 3kg when temperature rises to 700 DEG C, closes air-introduced machine 4 by sample place to go, numbering 3#.
5) Youxian County long-range cement P.I (42.5 grades) 5kg, sample number into spectrum 4# is taken.
Fewer due to feeding intake in said process, the sample obtained after calcining can Temperature fall.
(2) result of the test
Sample obtained above is subjected to the item-tests such as fineness, cement mortar strength, water demand ratio, loss on ignition, inspection by national standard
Test data and be shown in Table 1.
The inspection data of 1 different samples of table
Other correlation test data
1) the high-activity mineral material sample of Pingxiang text peak building materials local method technique productions burnt in a heap, numbering 1#.
2) the high-activity mineral material of gold pool cement plant mechanical shaft kiln burning production, sample number into spectrum 2#.
3) the high-activity mineral material of Zhuzhou celestial being Yu Tufa technique productions burnt in a heap, sample number into spectrum 3#.
4) Weihe sun second class powered coal ash of factory, sample number into spectrum 4# enter in Chaling par Shang Tong companies.
5) the three-level flyash of factory, sample number into spectrum 5# enter in Shang Tong companies in Chaling.
6) the P.I.42.5 class g cement numberings 6# of the long-range cement plant production of Youxian County.
Other associated samples are subjected to the item-tests such as fineness, cement mortar strength, water demand ratio, loss on ignition by national standard, examined
Data are shown in Table 2.
The inspection data of other samples of table 2
The method of production high-activity mineral material provided by the invention is can be seen that through experiment table from the data of Tables 1 and 2
It is bright, good product quality is burnt till, better than conventional production methods.
Embodiment 2
Fig. 2 is the signal provided in an embodiment of the present invention for implementing to produce another device of the method for high-activity mineral material
Figure.Figure it is seen that in the device, including vertical tube calcining furnace 1, combustion furnace 2, dust-precipitator, air-introduced machine 4, feed bin 10, metering
Device 9, discharger 8；
Wherein, feed bin 10 is connected with meter 9, and discharger 8 is connected with charging aperture, and meter 9 is used to control the feed bin
Mineral powder in 10 enters the dosage of discharger 8.Raw mineral materials obtains through crusher in crushing, flour mill grinding to defined fineness
To mineral powder, the boosted machine of mineral powder is delivered to feed bin, then conveys material feeding and discharging machine 8 through meter 9 (such as spiral metering reamer)
(such as air valve), then mineral powder vertical tube calcining furnace 1 is entered by charging aperture.During being somebody's turn to do, meter 9 controls the throwing of mineral powder
High-volume, ensure the quality of calcining, realize automation mechanized operation.
Dust-precipitator includes gravity dust-precipitator 13, rotoclone collector 11 and bagroom 12, rotoclone collector 11 and discharging
Device 8 is connected, and bagroom 12 is connected with rotoclone collector 11, and air-introduced machine 4 is connected with bagroom 12；Gravity dust-precipitator 13
It is connected with the top of vertical tube calcining furnace 1.
Wherein, rotoclone collector 11 is used to collect the mineral material by preheating, is then delivered in calcining furnace and is calcined,
Gravity dust-precipitator 13 collects calcined product.Dust-precipitator gas waste-heat is utilized simultaneously, mineral powder is preheated, thermal effect can be improved
Rate, the gas flow temperature of bagroom 12 is lowered into, to ensure bagroom normal operation.Bagroom is used to collect
The mineral material that rotoclone collector is not collected completely, to reach qualified discharge, the mineral material recoverable of collection, improve output
Rate.
Pipeline between feed bin 10 and rotoclone collector 11 connects with gravity dust-precipitator 13.So, in gravity dust-precipitator 13
Waste heat be used for preheat enter mineral powder, save the energy, and reduce calcining need time.
The first cooler 14 is additionally provided between gravity dust-precipitator 13 and vertical tube calcining furnace 1.First cooler 14 is used for will
Calcined product is cooled down, and makes the mineral powder after calcining between 380-450 DEG C, realizes the rapid cooling for burning till product, improves product
Quality.
The bottom of gravity dust-precipitator 13 is provided with the second cooler 15, and the mineral powder temperature after calcining is reduced into 100 DEG C
Below.The firing system of the present invention is by equipped with two level cooling system, being advantageous to burn till the quick cooling of material, improving calcining
Vitreum content, be advantageous to improve product fluidity, reduce the water requirement of product, product quality greatly improves.
Waste heat caused by first cooler 14 is passed through in combustion furnace 2.So, cooler waste heat is recovered enters coal dust firing
Stove, the thermal efficiency is improved, save the energy.
The bottom of economizer bank 7 is provided with striker plate 16.The bottom of economizer bank 7 sets striker plate 16, preferably to disperse ore deposit
Thing powder, makes mineral powder be fully burned, and improves product quality.
Vertical tube calcining furnace is additionally provided with temperature control system, and temperature control system is temperature-indicating instrument 5, realizes the accurate control of firing temperature
Quality is burnt till in system, raising.
Mineral powder is produced into high-activity mineral material using Fig. 2 device.
Group 1：Shale laboratory mill is levigate, and obtained mineral powder particle diameter is less than 200 μm, puts into the device in Fig. 2, forges
Temperature control is burnt at 700 DEG C, and obtained sample number into spectrum is 1#；
Group 2：Sandstone laboratory mill is levigate, and obtained mineral powder particle diameter is less than 100 μm, puts into the device in Fig. 2, forges
Temperature control is burnt at 600 DEG C, and obtained sample number into spectrum is 2#；
Group 3：Clay laboratory mill is levigate, and obtained mineral powder particle diameter is less than 180 μm, puts into the device in Fig. 2, forges
Temperature control is burnt at 700 DEG C, and obtained sample number into spectrum is 3#；
Group 4：Clay laboratory mill is levigate, and obtained mineral powder particle diameter is less than 50 μm, puts into the device in Fig. 2, forges
Temperature control is burnt at 500 DEG C, and obtained sample number into spectrum is 4#；
Group 5：The class g cements of P.I 42.5 of long-range cement company production are taken, obtained sample number into spectrum is 5#.
Sample obtained above is subjected to the item-tests such as fineness, cement mortar strength, water demand ratio, loss on ignition, inspection by national standard
Test data and be shown in Table 3.
The inspection data of 3 different samples of table
High-quality high-activity mineral material is produced, the high-activity mineral material of technology production, active coefficient is high, number
Value is between 0.7-0.8；Water requirement is low, and appearance luster is good, in Dark grey, the series of advantages such as particle sphericity height.Through experiment
Checking, properties of product are better than second class powered coal ash, are with a wide range of applications.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (12)
1. implement the device of the method for production high-activity mineral material, it is characterised in that including：Vertical tube calcining furnace, combustion furnace, receive
Dirt device, air-introduced machine；
Charging aperture is provided with the top of the vertical tube calcining furnace, the bottom of the vertical tube calcining furnace connects with the combustion furnace；
Economizer bank is provided with the vertical tube calcining furnace, the economizer bank is extended in the combustion furnace, the bottom of the economizer bank
Portion is provided with striker plate；
The vertical tube calcining furnace is connected with the dust-precipitator by pipeline；The air-introduced machine is connected with the dust-precipitator；
The method of the production high-activity mineral material comprises the following steps：
Raw mineral materials is ground into mineral powder, the particle diameter of the mineral powder is less than 200 μm；
The mineral powder is calcined, the mineral powder after calcining obtains high-activity mineral material through cooling；
The raw mineral materials is with SiO2、Al2O3For the natural minerals of main component；
SiO in the chemical composition of the raw mineral materials2Percetage by weight be 50%-80%, Al2O3Percetage by weight be
10%-30%；
The temperature of the calcining is 500 DEG C -650 DEG C；
It is described to be cooled to：Mineral powder after calcining is first cooled to 380-450 DEG C, is then cooled to less than 100 DEG C.
2. device according to claim 1, it is characterised in that described device also includes feed bin, meter and discharger；
The feed bin is connected with the meter, and the discharger is connected with the charging aperture, and the meter is used to control institute
State the dosage that the mineral powder in feed bin enters the discharger.
3. device according to claim 2, it is characterised in that the dust-precipitator includes gravity dust-precipitator, rotoclone collector
And bagroom, the rotoclone collector connect with the discharger, the bagroom connects with the rotoclone collector
Connect, the air-introduced machine is connected with the bagroom；
The gravity dust-precipitator is connected with the top of the vertical tube calcining furnace.
4. device according to claim 3, it is characterised in that pipeline between the feed bin and the rotoclone collector with
The gravity dust-precipitator connection.
5. device according to claim 3, it is characterised in that between the gravity dust-precipitator and the vertical tube calcining furnace also
It is provided with the first cooler.
6. device according to claim 5, it is characterised in that the bottom of the gravity dust-precipitator is provided with the second cooling
Device.
7. device according to claim 5, it is characterised in that waste heat caused by first cooler is passed through the burning
In stove.
8. according to the device described in claim any one of 1-7, it is characterised in that the vertical tube calcining furnace is additionally provided with temperature control system
System.
9. according to the device described in claim any one of 1-7, it is characterised in that the raw mineral materials is gangue, shale, sand
Any of rock, clay are a variety of.
10. according to the device described in claim any one of 1-7, it is characterised in that the mineral powder first carries out pre- before calcination
Heat.
11. device according to claim 10, it is characterised in that the heat that the thermal source of the preheating reclaims for the calcining
Amount.
12. according to the device described in claim any one of 1-7, it is characterised in that the mineral powder is to be entered with the state of suspension
Row calcining.
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| CN201510174997.7A CN104844043B (en) | 2014-12-02 | 2015-04-14 | A kind of method and its device for producing high-activity mineral material |
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