CN113457851A - Rotary friction electrostatic separator - Google Patents
Rotary friction electrostatic separator Download PDFInfo
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- CN113457851A CN113457851A CN202110817668.5A CN202110817668A CN113457851A CN 113457851 A CN113457851 A CN 113457851A CN 202110817668 A CN202110817668 A CN 202110817668A CN 113457851 A CN113457851 A CN 113457851A
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- 239000002245 particle Substances 0.000 claims abstract description 109
- 239000000463 material Substances 0.000 claims abstract description 75
- 238000000926 separation method Methods 0.000 claims abstract description 59
- 230000000694 effects Effects 0.000 claims abstract description 15
- 239000002783 friction material Substances 0.000 claims description 28
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 27
- 239000011707 mineral Substances 0.000 claims description 27
- 239000004020 conductor Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 3
- 230000005684 electric field Effects 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 3
- -1 polydimethylsiloxane Polymers 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 13
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 10
- 238000005265 energy consumption Methods 0.000 description 8
- 239000007858 starting material Substances 0.000 description 8
- 239000000428 dust Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000012141 concentrate Substances 0.000 description 5
- 239000003999 initiator Substances 0.000 description 5
- 229910052586 apatite Inorganic materials 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000005188 flotation Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B03C7/006—Charging without electricity supply, e.g. by tribo-electricity or pyroelectricity
-
- 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
- B03C7/12—Separators with material falling free
Landscapes
- Electrostatic Separation (AREA)
Abstract
The invention relates to a rotary friction electrostatic separator, comprising: a material receiver; the rotating friction particle electrification device is communicated with the material receiver and comprises an electrification cavity and a rotating roller arranged in the electrification cavity; the particle separation chamber is communicated with the rotary friction particle electrifying device, and a rotary electrode is arranged in the particle separation chamber; wherein the rotating electrode is arranged at one side and/or two sides of the particle separation chamber. The rotary friction electrostatic separator provided by the invention has higher electrification efficiency and better separation effect.
Description
Technical Field
The invention relates to the technical field of mineral processing engineering, in particular to a rotary friction electrostatic separator.
Background
The dry electrostatic separation technology is mainly applied to the aspects of mineral processing, food purification, waste utilization, particle purification and the like. The technology has low cost, no pollution to the environment, no use of chemical agents, no water consumption and no generation of tailing pulp, thereby gaining wide attention of a plurality of industries. However, due to the defects of the prior art and the equipment, the particle charging efficiency is low, the sorting precision is low, and the particle size range of the effectively sorted particles is narrow, so that the large-scale application of the particle sorting machine is limited. The friction body (starter) of the traditional friction electrostatic separation technology is still, particles are conveyed through high-pressure air to cause relative motion of the particles and the friction body, the relative motion speed is controlled by adjusting the air pressure and the flow of the high-pressure air, the energy consumption is high, and the friction electrification efficiency is low. Therefore, it is necessary to develop a rotary friction electrostatic separator with higher electrification efficiency and better separation effect.
Disclosure of Invention
The invention aims to provide a rotary friction electrostatic separator which is higher in electrification efficiency and better in separation effect.
In order to achieve the purpose, the invention provides the following scheme:
a rotary friction electrostatic classifier comprising:
the material receiver is used for receiving particles to be sorted;
the rotating friction particle electrification device is communicated with the material receiver, a fall height is arranged between the rotating friction particle electrification device and the material receiver, the rotating friction particle electrification device comprises an electrification shell and a rotating roller arranged in the shell, and an annular electrification cavity is formed between the rotating roller and the shell;
the particle separation chamber is communicated with the rotary friction particle generator, and a rotary electrode is arranged in the particle separation chamber; wherein the rotating electrode is arranged below the particle separation chamber, and the rotating electrode is one or more pairs of electrodes with opposite polarities;
the rotary roller is characterized by further comprising a first high-voltage direct current power supply and a second high-voltage direct current power supply, wherein one end of the first high-voltage direct current power supply is connected to the shell, the other end of the first high-voltage direct current power supply is connected to the rotary roller, and two ends of the second high-voltage direct current power supply are respectively connected to the rotary electrodes with opposite polarities.
Preferably, the potential of the rotary electrode is set to a maximum critical value for breaking air insulation, and the rotary motor is a rotary cylinder.
Preferably, the surface potential of the rotary friction particle electrifying device material is controlled and optimized through the arrangement of the first high-voltage direct-current power supply, and the particle charging effect is enhanced; and a second high-voltage direct-current power supply is used for providing an electrostatic electric field for sorting the particles for the particle separation chamber.
Preferably, the number of the rotating electrodes is two, and the rotating electrodes include a first rotating electrode and a second rotating electrode, the polarities of the first rotating electrode and the second rotating electrode are opposite, the rotating directions of the first rotating electrode and the second rotating electrode are opposite, and the first rotating electrode and the second rotating electrode are respectively arranged on two sides of the particle separation chamber.
Preferably, the particle separation chamber further comprises a first material outlet, a second material outlet and a middling outlet, the first material outlet is located at the bottom of the first rotating electrode, the second material outlet is located at the bottom of the second rotating electrode, and the middling outlet is arranged at the bottom of the particle separation chamber and located between the first rotating electrode and the second rotating electrode.
Preferably, the device also comprises a first material collecting box, a second material collecting box and a middling collecting box which are respectively used for receiving mineral products output by the first material outlet, the second material outlet and the middling outlet.
Preferably, the material collecting device further comprises a discharging scraper, wherein the discharging scraper is arranged on one side of the first rotating electrode and one side of the second rotating electrode and is positioned at the tops of the first material collecting box and the second material collecting box.
Preferably, the rotating friction particle starter further comprises a driving motor, an alternating current power supply, an outer layer friction material sleeve and a controller, wherein an output shaft of the driving motor is connected to the rotating roller, the outer layer friction material sleeve is arranged on the rotating roller, the alternating current power supply is electrically connected to the driving motor, and the controller is in communication connection with the alternating current power supply and the driving motor and is used for controlling the rotating speed of the rotating roller.
Preferably, the outer friction material sleeves are multiple, the materials of the outer friction material sleeves are the same or different, and the material of the outer friction material sleeves is at least one of copper, stainless steel, carbon-based non-metallic conductor material, ceramic, polyester fiber and polydimethylsiloxane.
Preferably, the rotating roll has a circular or polygonal cross-section.
The invention has the advantages that:
the rotary friction electrostatic separation system provided by the invention adopts the rotary roller as the electrification friction body, the rotary roller moves at a higher speed, the rotary energy consumption is low, the rotary speed is easy to control, the potential of the rotary roller is also controllable through the arrangement of a power supply, the electrification process generated by the contact of mineral particles and the rotary roller is further strengthened, and the particle electrification density is greatly improved compared with that of the conventional friction electrification method. The positive and negative charge and density of the charged particles can improve the regulation of the rotation speed and the potential control of the rotating roller, and compared with the traditional friction electrification method, the method has the advantages of high efficiency, low energy consumption and convenient control. The particle charged structure of the invention can make the charging cavity at the upper part of the device and the sorting cavity at the lower part completely independent, optimize the operating conditions respectively and really achieve the best sorting performance.
The products obtained after sorting are adsorbed on the positive and negative rotating electrodes and finally wiped down to the product collector, and compared with the traditional friction electrostatic sorting machine which collects the products by using a high-energy-consumption vacuum dust collector or a dust bag, the sorting time of the particles in the sorting cavity can be more flexibly and efficiently controlled by adjusting the rotating speed, the optimal sorting effect is realized, and the electricity consumption and the equipment cost are greatly saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a rotary friction electrostatic classifier according to the present invention;
FIG. 2 is a separation effect curve of the recovery rate of phosphorus pentoxide and the removal rate of acid-insoluble substances in the roughed apatite ore;
figure 3 is a re-concentration effect curve of the apatite concentrate flotation concentrate.
Description of the drawings: 1. a material receiver; 2. rotating the friction particle initiator; 3. a charging cavity; 4. a rotating roller; 5. a particle separation chamber; 6. a first rotating electrode; 7. a second rotating electrode; 8. a discharge scraper plate; 9. a first material collection box; 10. a middling collection box; 11. and the second material collecting box.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a rotary friction electrostatic separator which is higher in electrification efficiency and better in separation effect.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The present invention provides a rotary friction electrostatic classifier, comprising:
a material receiver; the material receiver is used for receiving particles to be sorted;
the rotary friction particle starter is communicated with the material receiver, and a fall height is arranged between the rotary friction particle starter and the material receiver, the rotary friction particle starter comprises a starter shell and a rotary roller arranged in the shell, and an annular power starting cavity is formed between the rotary roller and the shell;
the particle separation chamber is communicated with the rotary friction particle electrifying device, and a rotary electrode is arranged in the particle separation chamber; wherein the rotating electrode is arranged below the particle separation chamber, and the rotating electrode is one or more pairs of electrodes with opposite polarities.
The rotary roller is characterized by further comprising a first high-voltage direct current power supply and a second high-voltage direct current power supply, wherein one end of the first high-voltage direct current power supply is connected to the shell, the other end of the first high-voltage direct current power supply is connected to the rotary roller, and two ends of the second high-voltage direct current power supply are respectively connected to the rotary electrodes with opposite polarities.
Specifically, mix mineral and give into spin friction electrostatic separation machine through the receiver during use, mix mineral and get into spin friction granule electrification ware through the receiver, it is electrified with rotatory roller frictional contact to mix mineral, it is rotatory by the rotatory roller drive to mix mineral simultaneously, because the difference of ore grain slew velocity, mix mineral direct friction electrification, electrification efficiency is higher, the mineral after the electrification gets into the particle separation chamber, the mineral that has opposite electric charge can adsorb and retrieve on the rotating electrode. The further rotating electrode can be a single rotating electrode with positive charge or negative charge and arranged at one side of the particle separation chamber, or two selective electrodes with positive charge and negative charge respectively and arranged at two sides of the particle separation chamber.
Specifically, the power generation cavity at the upper part of the equipment and the separation cavity at the lower part of the equipment are completely independent, so that the operation conditions can be optimized respectively, and the optimal separation performance is really achieved.
Specifically, the material receiver receives the granular materials from the vibration or belt feeder, and the granular materials falling freely can reach a certain speed when entering the rotating friction particle power generator through the setting height of the fall. Further, auxiliary high pressure air may also be added to assist in achieving the necessary drop velocity when handling the fine particles.
Specifically, the rotary friction particle initiator includes an outer stationary housing and an inner electrically-charged rotating roller. Furthermore, the cross section of the shell is circular, and an annular electrification cavity is formed between the rotating roller and the shell. The rotating roller consists of an inner core and an outer layer of friction material sleeve, wherein the inner core is made of insulating materials, and the outer layer is made of conductors, so that the potential of the rotating roller can be controlled and optimized conveniently. The electrification (also called charging or charging) of the particles is completed by collision and friction between the particles and the outer surface of the rotating roller and the inner wall of the shell in the annular electrification cavity, and the potential applied to the surface of the rotating roller can effectively strengthen the electrification process.
Specifically, the particle separation chamber is communicated with the bottom of the rotary friction particle generator, and materials enter the particle separation chamber in a free falling mode after being electrified by the rotary friction particle generator.
Specifically, the particle separating chamber sets up in rotatory friction particle starting apparatus bottom, drops into the particle separating chamber under self gravity after the mixed mineral is electrified, falls into the particle separating chamber in-process at the mixed mineral, and the mixed mineral is the dispersion form, and the electrified mineral of being convenient for adsorbs and retrieves at rotating electrode.
Specifically, the particle separation chamber separates different charged particles from the rotary current generator by means of the difference of the free falling motion trajectories of the particles therein; wherein the rotating electrode is arranged below the particle separation chamber, and one or more pairs of positive and negative electrodes can be arranged.
As preferred scheme, rotating electrode is rotatory barrel, through adopting rotating electrode to replace traditional flat electrode, and the material is conveniently effective to electrode clearance. The electrode potential is set at a maximum threshold value before breaking the air insulation.
As a preferred scheme, the surface potential of the rotary friction particle electrifying device material is controlled and optimized through the arrangement of the first high-voltage direct-current power supply, and the particle charging effect is enhanced; and a second high-voltage direct-current power supply is used for providing an electrostatic electric field for sorting the particles for the particle separation chamber.
Preferably, the two rotating electrodes include a first rotating electrode and a second rotating electrode, the first rotating electrode and the second rotating electrode have opposite electrode polarities and opposite rotation directions, and the first rotating electrode and the second rotating electrode are respectively disposed on two sides of the particle separating chamber.
Specifically, through the arrangement of the first rotating electrode and the second rotating electrode, minerals with positive charges and negative charges after triboelectrification are respectively recovered, and separation of the minerals and output of multiple products are realized.
Preferably, the particle separation chamber further comprises a first material outlet, a second material outlet and a middling outlet, the first material outlet is located at the bottom of the first rotating electrode, the second material outlet is located at the bottom of the second rotating electrode, and the middling outlet is arranged at the bottom of the particle separation chamber and located between the first rotating electrode and the second rotating electrode.
As a preferred scheme, the device also comprises a first material collecting box, a second material collecting box and a middling collecting box which are respectively used for receiving mineral products output by the first material outlet, the second material outlet and the middling outlet.
Preferably, the device further comprises a discharging scraper which is arranged on one side of the first rotating electrode and one side of the second rotating electrode and is positioned at the top of the first material collecting box and the top of the second material collecting box.
Specifically, the discharge scraper is arranged on the particle separation chamber and is positioned on the inner side or the outer side of the side wall of the particle separation chamber, and when the first rotating electrode and the second rotating electrode rotate, minerals adsorbed on the first rotating electrode and the second rotating electrode can be in contact with the discharge scraper to discharge ores.
Specifically, the sorted product is adsorbed on the electrode and then wiped down to the product collector, so that a centrifugal dust collector or a dust bag under the action of the traditional vacuum is replaced. The sorting time of the particles in the sorting cavity can be flexibly and efficiently controlled by adjusting the rotating speed of the electrode, so that the power consumption and the equipment cost are greatly saved, and the loss of fine-grained materials is reduced.
As a preferred scheme, the rotary friction particle starter further comprises a driving motor, an alternating current power supply, an outer-layer friction material sleeve and a controller, wherein an output shaft of the driving motor is connected to the rotary roller, the outer-layer friction material sleeve is arranged on the rotary roller, the alternating current power supply is electrically connected to the driving motor, and the controller is in communication connection with the alternating current power supply and the driving motor and is used for controlling the rotating speed of the rotary roller.
Preferably, the outer friction material sleeve is a plurality of sleeves, and the material of the outer friction material sleeve can be at least one of copper, stainless steel, carbon-based non-metallic conductor material, ceramic, polyester fiber and polydimethylsiloxane.
Specifically, when the separator is used, the outer-layer friction material sleeve is sleeved on the rotating roller, the mixed minerals and the rotating roller are subjected to contact friction electrification, on one hand, the same minerals and the outer-layer friction material sleeves made of different materials can carry different charges through friction, so that the rotating friction electrostatic separator is wider in application range, and on the other hand, the minerals are prevented from directly wearing the rotating roller through the arrangement of the outer-layer friction material sleeve. When the device is used, the rotating roller can be connected with or not connected with electricity, and more preferably, the rotating roller is connected with a power supply to provide potential for the rotating roller, so that the mineral is conveniently subjected to frictional electrification.
Specifically, when the outer friction material is a conductor, the potential of the outer friction material is controlled by a high-voltage direct-current power supply, so that the electrification effect of the outer friction material is further enhanced.
Specifically, the conventional triboelectrostatic sorting technique is tribostatic. The movement of particles (high-pressure air is generally used for fine particles), the energy consumption is high, and the charging efficiency is low. The invention adopts the rotating roller as the electrification friction body, and the electrification property and the density of the particles can be controlled by controlling the rotating speed of the rotating roller and the material of the outer layer friction material sleeve. The shape of the rotating roller can be circular or polygonal, and the material can be a conductor, a semiconductor or an insulator.
Preferably, the cross section of the rotating roller is circular or polygonal.
Specifically, the section of the rotating roller is circular or polygonal, so that the rotating roller is cylindrical or prismatic, and the outer layer friction material sleeve can be conveniently sleeved.
Example (b):
FIG. 1 shows a schematic block diagram of a rotary triboelectric electrostatic classifier according to one embodiment of the present invention. As shown in fig. 1, the rotary friction electrostatic classifier includes:
a material receiver 1;
the device comprises a rotating friction particle initiator 2, wherein the rotating electrical device 2 is communicated with a material receiver 1, a fall height is arranged between the rotating electrical device 2 and the material receiver 1, the rotating friction particle initiator 2 comprises an initiator shell and a rotating roller 4 arranged in the shell, and an annular electrification cavity 3 is formed between the rotating roller 4 and the shell;
the particle separation chamber 5 is communicated with the rotary friction particle generator 2, and materials are charged by the rotary friction particle generator 2 and then freely fall into the particle separation chamber 5;
a first rotating electrode 6 and a second rotating electrode 7, wherein the electrode polarities of the first rotating electrode 6 and the second rotating electrode 7 are opposite, and the first rotating electrode 6 and the second rotating electrode 7 are respectively arranged at two sides of the particle separation chamber 5;
a first material outlet, a second material outlet and a middling outlet, wherein the first material outlet is positioned at the bottom of the first rotating electrode 6, the second material outlet is positioned at the bottom of the second rotating electrode 7, and the middling outlet is arranged at the bottom of the particle separation chamber 5 and positioned between the first rotating electrode 6 and the second rotating electrode 7;
the discharging scraper 8 is arranged on one side of the first rotating electrode 6 and one side of the second rotating electrode 7, and is positioned at the tops of the first material collecting box 9 and the second material collecting box 11;
the first material collecting box 9, the second material collecting box 11 and the middling collecting box 10 are respectively used for receiving minerals output by the first material outlet, the second material outlet and the middling outlet;
a first high voltage direct current power supply 12 and a second high voltage direct current power supply 13, wherein one end of the first high voltage direct current power supply 12 is connected to the housing, the other end is connected to the rotating roller 4, and two ends of the second high voltage direct current power supply 13 are respectively connected to the rotating electrodes with opposite polarities.
The rotating friction particle starter 2 further comprises a driving motor, a power supply, an outer-layer friction material sleeve and a controller, wherein an output shaft of the driving motor is connected to the rotating roller 4, the outer-layer friction material sleeve is arranged on the rotating roller 4, the power supply is electrically connected to the rotating roller 4, and the controller is in communication connection with the driving motor and the power supply.
The outer-layer friction material sleeves are multiple, and the materials of the outer-layer friction material sleeves are the same or different.
The rotary friction electrostatic separation system adopts the rotary roller as the electrification friction body, the rotary roller moves at a higher speed, the rotary energy consumption is low, the rotary speed is easy to control, the potential of the rotary roller is also controllable through the arrangement of a power supply, the electrification process generated by the contact of mineral particles and the rotary roller is further strengthened, and the particle electrification density is greatly improved compared with that of the conventional friction electrification method. The positive and negative charge and density of the charged particles can improve the regulation of the rotation speed and the potential control of the rotating roller, and compared with the traditional friction electrification method, the method has the advantages of high efficiency, low energy consumption and convenient control. The particle charged structure of the invention can make the charging cavity at the upper part of the device and the sorting cavity at the lower part completely independent, optimize the operating conditions respectively and really achieve the best sorting performance. The charged particles after being charged in the charging cavity freely fall to the separation cavity by means of gravity, and the positively charged particles are attracted by the negatively charged rotating electrode and rotate to the right mine discharge opening in the figure 1 to be wiped off. The negatively charged particles are attracted by the positively charged rotating electrode and rotate to the left discharge opening in fig. 1 to be scraped off. The particles falling from the middle due to insufficient charge are discharged from the bottom as middlings, can be returned to a feeding port for further separation, and can also be used as an independent product. The products obtained after sorting are adsorbed on the positive and negative rotating electrodes and finally wiped down to the product collector, and compared with the traditional friction electrostatic sorting machine which collects the products by using a high-energy-consumption vacuum dust collector or a dust bag, the sorting time of the particles in the sorting cavity can be more flexibly and efficiently controlled by adjusting the rotating speed, the optimal sorting effect is realized, and the electricity consumption and the equipment cost are greatly saved.
Test example 1
In order to more fully evaluate the sorting effect of the invention on the nonmetallic minerals, in the test example, apatite flotation feed samples with the granularity of 16-150 meshes and the phosphorus pentoxide grade of 10% are adopted to carry out a rotary friction electrostatic sorting test for carrying out rough sorting on the phosphate ores, and then the coarse sorting is carried out again through the rotary friction electrostatic sorting machine of the invention.
Wherein, figure 2 shows the separation effect curve of the recovery rate of phosphorus pentoxide and the removal rate of acid insoluble substances of the apatite ore concentrate obtained by rough concentration. The sorting curve is very close to the upper right corner of the figure, which clearly shows that the rotary friction electrostatic sorting technology can effectively realize the high-efficiency separation of quartz in phosphorite. For example, when the quartz removal rate is 85%, the phosphorus pentoxide recovery rate is 90%, and the concentrate grade is about 32%, which is far better than the sorting result of the conventional triboelectric separation.
FIG. 3 shows the separation effect of the rotary friction electrostatic separation technology on the re-separation of phosphate ore flotation concentrate to produce food-grade phosphate. Obviously, the rotating friction electrostatic separation technology can improve the grade of phosphorus pentoxide from 31.7% to over 35%, and the recovery rate is about 82%. This also demonstrates that the rotary tribostatic sorting technique has better selectivity and sorting than flotation.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A rotary friction electrostatic classifier, comprising:
the material receiver is used for receiving particles to be sorted;
the rotating friction particle electrification device is communicated with the material receiver, a fall height is arranged between the rotating friction particle electrification device and the material receiver, the rotating friction particle electrification device comprises an electrification shell and a rotating roller arranged in the shell, and an annular electrification cavity is formed between the rotating roller and the shell;
the particle separation chamber is communicated with the rotary friction particle generator, and a rotary electrode is arranged in the particle separation chamber; wherein the rotating electrode is arranged below the particle separation chamber, and the rotating electrode is one or more pairs of electrodes with opposite polarities;
the rotary roller is characterized by further comprising a first high-voltage direct current power supply and a second high-voltage direct current power supply, wherein one end of the first high-voltage direct current power supply is connected to the shell, the other end of the first high-voltage direct current power supply is connected to the rotary roller, and two ends of the second high-voltage direct current power supply are respectively connected to the rotary electrodes with opposite polarities.
2. The rotary triboelectrostatic classifier of claim 1, wherein the potential of the rotating electrode is set at a maximum critical value for breaking air insulation, and the rotating motor is a rotating cylinder.
3. The rotary friction electrostatic classifier according to claim 1, wherein the surface potential of the rotary friction particle electrizer material is controlled and optimized to enhance the particle charging effect by the arrangement of the first high-voltage direct current power supply; and a second high-voltage direct-current power supply is used for providing an electrostatic electric field for sorting the particles for the particle separation chamber.
4. The rotary triboelectrostatic classifier of claim 1, wherein the number of rotating electrodes is two, and the rotating electrodes include a first rotating electrode and a second rotating electrode, the first rotating electrode and the second rotating electrode have opposite polarities and opposite rotation directions, and the first rotating electrode and the second rotating electrode are respectively disposed on both sides of the particle separation chamber.
5. The rotary friction electrostatic classifier of claim 4, wherein the particle separation chamber further comprises a first material outlet located at the bottom of the first rotating electrode, a second material outlet located at the bottom of the second rotating electrode, and a middling outlet opening at the bottom of the particle separation chamber between the first rotating electrode and the second rotating electrode.
6. The rotary friction electrostatic classifier of claim 5, further comprising a first material collection box, a second material collection box and a middling collection box for receiving mineral products from the first material outlet, the second material outlet and the middling outlet, respectively.
7. The rotary friction electrostatic classifier of claim 6, further comprising a discharge scraper disposed on one side of the first and second rotatable electrodes at the top of the first and second material collection boxes.
8. The rotary friction electrostatic classifier of claim 1, wherein the rotary friction particle generator further comprises a driving motor, an ac power source, an outer layer friction material sleeve and a controller, wherein an output shaft of the driving motor is connected to the rotary roller, the outer layer friction material sleeve is sleeved on the rotary roller, the ac power source is electrically connected to the driving motor, and the controller is communicatively connected to the ac power source and the driving motor for controlling the rotation speed of the rotary roller.
9. The rotary friction electrostatic classifier of claim 8, wherein the outer friction material sleeve is a plurality of outer friction material sleeves, the plurality of outer friction material sleeves are made of the same or different materials, and the outer friction material sleeves are made of at least one of copper, stainless steel, carbon-based non-metallic conductor materials, ceramics, polyester fibers and polydimethylsiloxane.
10. The rotary triboelectrostatic classifier of claim 1, wherein the rotating roller is circular or polygonal in cross-section.
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| CN202110346114 | 2021-03-31 | ||
| CN2021103461141 | 2021-03-31 |
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| CN113457851A true CN113457851A (en) | 2021-10-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114769004A (en) * | 2022-03-22 | 2022-07-22 | 江苏大学 | Engineering sump oil high-efficient filter equipment based on friction electric charge principle |
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| CN114769004B (en) * | 2022-03-22 | 2024-09-27 | 江苏大学 | Engineering sewage oil efficient filtering device based on friction charge principle |
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