CN106890729A - The friction charged method and device of one kind classification - Google Patents
The friction charged method and device of one kind classification Download PDFInfo
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- CN106890729A CN106890729A CN201710149556.0A CN201710149556A CN106890729A CN 106890729 A CN106890729 A CN 106890729A CN 201710149556 A CN201710149556 A CN 201710149556A CN 106890729 A CN106890729 A CN 106890729A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 33
- 238000003780 insertion Methods 0.000 claims description 16
- 230000037431 insertion Effects 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 14
- 230000005686 electrostatic field Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 abstract description 12
- 238000000926 separation method Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 7
- 239000004503 fine granule Substances 0.000 abstract description 2
- 235000012054 meals Nutrition 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 240000002853 Nelumbo nucifera Species 0.000 description 5
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 5
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229920005479 Lucite® Polymers 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
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- 230000003014 reinforcing effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C7/00—Separating solids from solids by electrostatic effect
- B03C7/02—Separators
Landscapes
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention discloses one kind friction charged method and device of classification, using the classification and friction charged effect of the friction charged device of eddy flow type, there is the friction charged device group of the eddy flow type of multi-stage separation granular gradient along wind path direction by one with wind drive material, by particle size range material wide be divided into some narrow grades carry out it is friction charged, large or fine granule in friction charged device can not only be cut down to mix with thin mud disperse to friction charged influence, also it is avoided that the friction charged device fine fraction of cyclone type is difficult to charged problem, be conducive to the friction charged of material, improve carried charge, at the same time, because narrow grade raw meal particle size is uniform, it is also beneficial to improve the efficiency of separation of follow-up electrostatic separation.
Description
Technical field
The present invention relates to one kind friction charged method and device of classification, belong to electric separation technical field.
Background technology
Electric separation is the class sorting technology separated using the electrical property difference of material, purified, be classified, with efficiently,
The advantages of energy-conserving and environment-protective, the aspects such as sorting mineral, agricultural product sorting have been widely used in it.It is to realize that electric separation is separated that material is charged
Basic condition, be also electric separation research main contents.The charged mode of material is varied, have corona charging, contact it is charged,
Composite Field is charged, electrostatic induction is charged and friction charged etc., wherein the friction charged lotus that can not only be realized between conductor material
Electricity, moreover it is possible to realize charged between non-conductor material, is a kind of charged mode of great potential.
It is friction charged to be divided into two classes according to the difference of driving force, a class be using mechanical force or mineral self gravitation as
Defeated ore deposit power, including vibra shoot, chute, rotor, turbine etc., often there is that carrying capacity is few, ore particle is charged uneven, charged
The shortcomings of poor selectivity and equipment easy to wear；Another kind of is using air stream as defeated ore deposit power, including fluid bed, air cyclone
Deng, charged effect preferably, adapt to that ore properties are wide, follow-up separation is easily matched and dust pollution is controllable, be considered to have good
Prospect.
It is required for making valuable mineral and gangue mineral monomer dissociation by ore grinding before material is selected, ore grinding is one very complicated
Process, ore milling product is often particle size range hybrid particles wide, at present still can not effectively grind narrow grade product
Method and apparatus, and numerous friction charged research shows, raw meal particle size scope it is more big be unfavorable for it is friction charged, especially slightly
Fine grained mixes the situation with thin mud disperse.Because electric separation is a kind of dry type ore sorting method, traditional wet grinding and classification is difficult
To be applied to electric separation or need to increase cost dehydration, dried process.The friction charged device of eddy flow type is a kind of air-flowing type friction
Charge electric appliance, not only with charged effect, moreover it is possible to be classified, can coordinate dry milling to use, but its to be used for material friction charged
When, charged effect is poor, and fine will be spilled off and be difficult to charged.
The content of the invention
The present invention provides a kind of friction charged method and device of classification, is connected by the friction charged device of several eddy flow types
The composition friction charged device group of eddy flow type carries out friction charged, or the friction charged device group of eddy flow type rubs with other kinds of again
Wiping charge electric appliance combination carries out friction charged, makes full use of the grading of the friction charged device of eddy flow type, and particle size range is wide
Material be divided into some narrow grades carry out it is friction charged, so as to cut down large or fine granule mix with thin mud disperse to friction charged shadow
Ring, make material friction charged more abundant.
The present invention is achieved through the following technical solutions：
The friction charged method of one kind classification, by the friction charged device series connection of two or more eddy flow type, composition eddy flow type friction lotus
Electrical equipment group, is allowed to form gas-solid biphase flow with the dried thickness mixture of wind drive, from first eddy flow type friction lotus
The feed pipe of electrical equipment feeds the friction charged device group of eddy flow type, under the grading of the friction charged device group of eddy flow type, material
It is divided into several narrow grades, while carrying out friction charged；Difficult charged thin mud is overflow from the end friction charged device of eddy flow type
Flow tube is discharged, and is reclaimed into deduster, and the air after removal thin mud feeds blower fan, forms a wind path circulation；After charged
Narrow grade material discharged from the underflow pipe of the corresponding friction charged device of cyclone type respectively, can directly feed high-voltage electrostatic field point
Choosing, or to feed and strengthen charged again in other friction charged devices；
The arrangement for constituting each friction charged device of eddy flow type of the friction charged device group of eddy flow type meets any in following condition
One or more conditions：From head to tail, the internal diameter of the friction charged device of eddy flow type is sequentially reduced, feed pipe bore is sequentially reduced,
Overfall tube diameter is sequentially reduced, cone angle is sequentially reduced, overflow pipe insertion depth is sequentially reduced, bore ratio increases successively.
The friction charged device of one kind classification, including the friction charged device group 2 of charging gear 1, eddy flow type, deduster 3, blower fan
4 and pipeline 5, the friction charged device group 2 of eddy flow type is composed in series by the two or more friction charged device of eddy flow type；
The friction charged device of eddy flow type has three openings, i.e. overflow pipe 6, feed pipe 7 and underflow pipe 8, and the wherein lower end of underflow pipe 8 sets
Ring flange 9 is put, for connecting high-voltage electrostatic field sorting unit or other friction charged devices；
Charging gear 1 is arranged on the pipeline 5 before the feed pipe 7 of the first friction charged device of eddy flow type, previous eddy flow type
The overflow pipe of friction charged device is connected by pipeline 5 with the feed pipe of the latter friction charged device of eddy flow type, end cyclone
The overflow pipe of the friction charged device of type is connected by pipeline 5 with deduster 3, and deduster 3 is connected by pipeline 5 with the entrance of blower fan 4,
The outlet of blower fan 4 is connected by pipeline 5 with the feed pipe of the first friction charged device of eddy flow type, and whole device formation one is closed
Wind path circulation；
The arrangement for constituting each friction charged device of eddy flow type of the friction charged device group 2 of eddy flow type meets any in following condition
One or more conditions：From head to tail, the internal diameter of the friction charged device of eddy flow type is sequentially reduced, feed pipe bore is sequentially reduced,
Overfall tube diameter is sequentially reduced, cone angle is sequentially reduced, overflow pipe insertion depth is sequentially reduced, bore ratio increases successively；
The all friction charged devices of eddy flow type for constituting the friction charged device group 2 of eddy flow type are fixed by support, make its position
It is constant, and be underflow pipe 8 and put down.
The friction charged device basic structure of described eddy flow type and material all same, only exist the difference of structural parameters.
The course of work of the friction charged device of classification of the present invention：Thickness mixture feeds pipe by charging gear 1
Road 5, formation gas-solid biphase flow feeds the first friction charged device of eddy flow type under the driving of wind-force, and fine grained and air are to center
Axis direction is moved, and forms an inside vortex for moving upwards in axis centre, and second rotation is escaped and enter from overflow pipe 6
The stream friction charged device of type；Coarse granule is moved axially downwards in the presence of flow field, is moved radially outwards, and reaches circular cone
Moved downward along wall after the b of chamber, violent friction produced between particle, between particle and wall and charged, it is charged after particle
Discharged from underflow pipe 8, high-voltage electrostatic field can be fed and sorted, or feed other friction charged devices and strengthen friction again
It is charged.There is same process in second friction charged device of eddy flow type, the like, the air of entrained fines level material is flowed into
Enter the end friction charged device of eddy flow type, wherein difficult charged fine mud material enters deduster with air from after overflow pipe discharge
Purification, the air after purification enters blower fan, completes a complete circulation.Due to be connected the friction charged device of eddy flow type along
Air-flow direction has certain partition size gradient, and thickness mixture will be divided into several narrow grade materials, Neng Gougeng
Effectively carry out it is friction charged, and final difficult charged fine mud material by most end the friction charged device of eddy flow type overflow
Pipe is discharged, and is reclaimed in deduster.
Principle of the invention：The friction charged device of eddy flow type refers to as the friction charged cyclone of ore particle, by cylindrical cavity a and
Conical cavity b is constituted, with three openings, i.e. feed pipe 7, overflow pipe 6 and underflow pipe 8.Feed and medium（Such as dry air, non-
Conductive air-liquid medium etc.）The mixture of formation tangentially feeds the friction charged device of eddy flow type from feed pipe at a high speed, in circle
High speed rotational flow field, coarse granule is produced to be moved axially downwards in the presence of flow field, moved radially outwards in a of post chamber,
Moved downward along wall after reaching conical cavity b, and from underflow pipe discharge, form outer swirling flow field；Fine grained and medium are to center
Axis direction is moved, and forms an inside vortex for moving upwards in axis centre, is then discharged by overflow pipe 6, so as to realize
Classification；The structural parameters of the friction charged device of eddy flow type（Such as internal diameter --- refer to cylindrical cavity a diameters, feed pipe bore, cone angle
β --- referring to centrum angle, overfall tube diameter, overflow pipe insertion depth, overflow thickness of pipe wall, the cone ratio of conical cavity b --- refers to underflow
The ratio between pipe diameter and overfall tube diameter, inside surface roughness etc.）And operating parameter（Such as feeding pressure, feeding coal, feedstock concentrations
With feeding granularity etc.）Its classification efficiency and partition size will be influenceed, wherein structural parameters and feeding pressure are that it mainly influences
Factor, realizes separating grain by adjusting internal diameter, feed pipe diameter, overfall tube diameter, cone angle, overflow pipe insertion depth, cone ratio
Degree gradient, it is however generally that, internal diameter reduces, feed pipe bore reduces, overfall tube diameter reduces, cone angle reduces, overflow pipe insertion is deep
Degree reduces, cone attenuates than increase partition size.
The present invention is composed in series the friction charged device group of eddy flow type using multiple eddy flow friction charged devices of type, constitutes eddy flow
Each friction charged device of eddy flow type of the friction charged device group of type, from head to tail, internal diameter is sequentially reduced, feed pipe bore subtracts successively
Small, overfall tube diameter is sequentially reduced, cone angle is sequentially reduced, overflow pipe insertion depth is sequentially reduced, bore and increase than successively so that thick
Thin mixture forms certain partition size gradient along wind path direction, and more and more thinner to the overflow granularity of tail from head,
So as to be subdivided into several narrow grade materials, and the narrow grade material after subdivision is set to enter in the corresponding friction charged device of eddy flow type
Row is friction charged, strengthens charged in also these narrow grades can also respectively being fed into other kinds of friction charged device, will be very big
The friction charged effect of ground improving material, realizes that the high efficiency of thickness mixture is charged.
The present invention has the advantage that：
（1）Thickness mixture is divided into some narrow grade materials, due to the epigranular of narrow grade material, is mitigated thickness and is mixed
To the friction charged interference for bringing, friction charged effect can be greatly lifted, can also fed in other friction charged devices again
Secondary reinforcing is charged, and both accumulate the friction charged carried charge for being conducive to increasing material；
（2）Classification is friction charged can be pre-separated out difficult charged thin mud, it is to avoid the influence of thin mud disperse in friction charged device；
（3）Even-grained narrow grade material can not only obtain more preferable friction charged effect, used as follow-up electrostatic separation
Feed, can be avoided in assorting room it is excessive because of particle size differences caused by interference, be conducive to improve the efficiency of separation.
Brief description of the drawings
Fig. 1 is the structural representation of the friction charged device of classification of the present invention；
Fig. 2 is the friction charged device structural representation of eddy flow type.
In figure：1- charging gears, the friction charged device group of 2- eddy flow types, 3- dedusters, 4- blower fans, 5- pipelines, 6- overflows
Pipe, 7- feed pipes, 8- underflow pipes, 9- ring flanges, a- cylindrical cavities, b- conical cavities, β-cone angle.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples, but the scope of the present invention be not limited to it is described
Content.
Embodiment 1
The friction charged method of one kind classification, by three friction charged device series connection of eddy flow type, from head to tail, eddy flow type friction lotus
The internal diameter of electrical equipment, feed pipe bore, overfall tube diameter, cone angle and overflow pipe insertion depth are sequentially reduced, and cone increases than successively, group
Into the friction charged device group of eddy flow type.It is allowed to form gas-solid biphase flow with the dried thickness mixture of wind drive, from head
The feed pipe of the individual friction charged device of eddy flow type feeds the friction charged device group of eddy flow type, in the friction charged device group of eddy flow type
Under grading, material is divided into three narrow grades, while carrying out friction charged；Difficult charged thin mud is rubbed from end eddy flow type
The overflow pipe discharge of charge electric appliance is wiped, is reclaimed into deduster, the air after removal thin mud feeds blower fan, forms a wind path
Circulation；Narrow grade material after charged is discharged from the underflow pipe of the corresponding friction charged device of cyclone type respectively, directly feeds high pressure
Electrostatic field is sorted.
As depicted in figs. 1 and 2, a kind of friction charged device of classification, including charging gear 1, the friction charged device of eddy flow type
Group 2, deduster 3, blower fan 4 and pipeline 5, the friction charged device group 2 of eddy flow type is by three friction charged device series connection groups of eddy flow type
Into from head to tail, the internal diameter of the friction charged device of eddy flow type is sequentially reduced, respectively 500mm, 350mm and 250mm；Feed pipe
Bore is sequentially reduced, respectively 110 × 120mm2、80×65mm2With 50 × 20mm2；Overfall tube diameter is sequentially reduced, respectively
180mm, 115mm and 34mm；Cone angle is sequentially reduced, respectively 20 °, 19 ° and 18 °；Overflow pipe insertion depth is sequentially reduced, respectively
It is 40mm, 32mm and 20mm；Cone increases than successively, respectively 0.61,0.69 and 0.74；
The friction charged device of eddy flow type has three openings, i.e. overflow pipe 6, feed pipe 7 and underflow pipe 8, and the wherein lower end of underflow pipe 8 sets
Ring flange 9 is put, for connecting high-voltage electrostatic field；
Charging gear 1 is arranged on the pipeline 5 before the feed pipe 7 of the first friction charged device of eddy flow type, previous eddy flow type
The overflow pipe of friction charged device is connected by pipeline 5 with the feed pipe of the latter friction charged device of eddy flow type, end cyclone
The overflow pipe of the friction charged device of type is connected by pipeline 5 with deduster 3, and deduster 3 is connected by pipeline 5 with the entrance of blower fan 4,
The outlet of blower fan 4 is connected by pipeline 5 with the feed pipe of the first friction charged device of eddy flow type, and whole device formation one is closed
Wind path circulation；
All friction charged devices of eddy flow type are fixed by support, make its position constant, and are underflow pipe 8 and are put down；Institute
Some friction charged device basic structure all sames of eddy flow type, and made using stainless steel.
Embodiment 2
The friction charged method of one kind classification, general principle is same as Example 1, and difference is the friction charged device group 2 of eddy flow type
It is composed in series by two friction charged devices of eddy flow type.From head to tail, the internal diameter of the friction charged device of eddy flow type, cone angle and overflow
Pipe insertion depth is constant, and feed pipe bore, overfall tube diameter are sequentially reduced；Cone ratio increases successively；Material is divided into two narrow grains
Level.
The friction charged device of one kind classification, basic structure is same as Example 1, and difference is the friction charged device of eddy flow type
Group 2 is composed in series by two friction charged devices of eddy flow type.From head to tail, the internal diameter of the friction charged device of eddy flow type, cone angle and
Overflow pipe insertion depth is constant, respectively 350mm, 20 ° and 35mm；Feed pipe bore is sequentially reduced, respectively 80 × 65mm2With
70×60mm2；Overfall tube diameter is sequentially reduced, respectively 115mm and 95mm；Cone increases than successively, and respectively 0.61 and 0.84；
All friction charged devices of eddy flow type are made using lucite.
Embodiment 3
The friction charged method of one kind classification, general principle is same as Example 2, and difference is, from head to tail, the friction of eddy flow type
The cone angle of charge electric appliance is constant, and internal diameter, feed pipe bore, overfall tube diameter, overflow pipe insertion depth are sequentially reduced；Cone ratio increases successively
Greatly；Material is divided into two narrow grades.
The friction charged device of one kind classification, basic structure is same as Example 2, and difference is, from head to tail, eddy flow type
The cone angle of friction charged device is constant, is 20 °；Internal diameter is sequentially reduced, respectively 300mm and 150mm；Feed pipe bore subtracts successively
It is small, respectively 47 × 60mm2With 22 × 22mm2；Overfall tube diameter is sequentially reduced, respectively 75mm and 32mm；Overflow pipe insertion is deep
Degree is sequentially reduced, respectively 30mm and 20mm；Cone increases than successively, and respectively 0.53 and 0.75；All eddy flow types friction lotuses
Electrical equipment is made using fine copper.
Embodiment 4
The friction charged method of one kind classification, general principle is same as Example 1, and difference is, from head to tail, the friction of eddy flow type
Than constant, internal diameter is sequentially reduced for the feed pipe bore of charge electric appliance, overfall tube diameter, cone angle, overflow pipe insertion depth and cone；Material
It is divided into three narrow grades.
The friction charged device of one kind classification, basic structure is same as Example 1, and difference is, from head to tail, eddy flow type
The feed pipe bore of friction charged device, overfall tube diameter, cone angle, overflow pipe insertion depth and cone than constant, respectively 25 ×
10mm2, 40mm, 20 °, 24mm and 0.62；Internal diameter is sequentially reduced, respectively 250mm, 150mm and 125mm；All eddy flow types
Friction charged device is made using fine copper.
Claims (5)
1. a kind of friction charged method of classification, by the friction charged device series connection of two or more eddy flow type, constitutes the friction of eddy flow type
Charge electric appliance group, is allowed to form gas-solid biphase flow with the dried thickness mixture of wind drive, from the friction of first eddy flow type
The feed pipe of charge electric appliance feeds the friction charged device group of eddy flow type, under the grading of the friction charged device group of eddy flow type, thing
Material is divided into several narrow grades, while carrying out friction charged；Difficult charged thin mud is from the end friction charged device of eddy flow type
Overflow pipe is discharged, and is reclaimed into deduster, and the air after removal thin mud feeds blower fan, forms a wind path circulation；It is charged
Narrow grade material afterwards is discharged from the underflow pipe of the corresponding friction charged device of cyclone type respectively, directly feeds high-voltage electrostatic field point
Choosing, or to feed and strengthen charged again in other friction charged devices；
The arrangement for constituting each friction charged device of eddy flow type of the friction charged device group of eddy flow type meets any in following condition
One or more conditions：From head to tail, the internal diameter of the friction charged device of eddy flow type is sequentially reduced, feed pipe bore is sequentially reduced,
Overfall tube diameter is sequentially reduced, cone angle is sequentially reduced, overflow pipe insertion depth is sequentially reduced, bore ratio increases successively.
2. a kind of friction charged device of classification, including charging gear（1）, the friction charged device group of eddy flow type（2）, deduster（3）、
Blower fan（4）And pipeline（5）, the friction charged device group of eddy flow type（2）It is composed in series by the two or more friction charged device of eddy flow type；
The friction charged device of eddy flow type has three openings, i.e. overflow pipe（6）, feed pipe（7）And underflow pipe（8）；
Charging gear（1）It is arranged on the friction charged device group of eddy flow type（2）The first friction charged device of eddy flow type feed pipe
（7）Preceding pipeline（5）On, the overflow pipe of the previous friction charged device of eddy flow type passes through pipeline（5）With latter eddy flow type
The feed pipe connection of friction charged device, the overflow pipe of the end friction charged device of eddy flow type passes through pipeline（5）With deduster（3）Even
It is logical, deduster（3）By pipeline（5）With blower fan（4）Entrance connection, blower fan（4）Outlet pass through pipeline（5）With first eddy flow
The feed pipe connection of the friction charged device of type, whole device forms closed wind path circulation；
The composition friction charged device group of eddy flow type（2）The arrangement of each friction charged device of eddy flow type meet appointing in following condition
Anticipate one or more conditions：From head to tail, the internal diameter of the friction charged device of eddy flow type is sequentially reduced, feed pipe bore subtracts successively
Small, overfall tube diameter is sequentially reduced, cone angle is sequentially reduced, overflow pipe insertion depth is sequentially reduced, bore ratio increases successively.
3. it is according to claim 2 to be classified friction charged device, it is characterised in that the composition friction charged device group of eddy flow type
（2）All friction charged devices of eddy flow type fixed by support.
4. it is according to claim 2 to be classified friction charged device, it is characterised in that the friction charged device of eddy flow type is underflow
Pipe（8）Put down.
5. it is according to claim 2 to be classified friction charged device, it is characterised in that underflow pipe（8）Lower end sets ring flange
（9）.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107684978A (en) * | 2017-10-12 | 2018-02-13 | 宁波工程学院 | A kind of circulating frictional static dust arrester |
| CN109622231A (en) * | 2018-11-26 | 2019-04-16 | 中国矿业大学 | The friction electrical selection sorting unit and method of electrification are strengthened in a kind of pre- classification |
| CN112934470A (en) * | 2021-02-18 | 2021-06-11 | 大连理工大学 | Magnesite powder composite particle grading and triboelectric separation device |
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