CN104998715B - Dry coal dressing method - Google Patents
Dry coal dressing method Download PDFInfo
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- CN104998715B CN104998715B CN201510498724.8A CN201510498724A CN104998715B CN 104998715 B CN104998715 B CN 104998715B CN 201510498724 A CN201510498724 A CN 201510498724A CN 104998715 B CN104998715 B CN 104998715B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/10—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/30—Shape or construction of rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Combined Means For Separation Of Solids (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses an air separation chamber of a dry-type coal separation separator, wherein in an air separation stage, a triangular annular chain structure and an excitation structure are used, and a chain plate is also used for uniformly recovering metal impurities which are subsequently and further separated, so that the metal impurities are recovered with higher purity, the waste of metal resources is prevented, and an air distribution plate supplies pulse air and continuous strong air in regions to lock light gray matter; the gray matter can be combined with water vapor generated by heating raw coal before, so that the gray matter can be recovered conveniently.
Description
The invention relates to a divisional application of a 'dry coal preparation method', the application date of the original application is 3-14 months 2014, the application number of the original application is 2014100945913, and the invention creation name of the original application is 'a dry coal preparation method'.
Technical Field
The invention relates to a coal dressing method, belonging to the field of dry coal dressing.
Background
The existing coal separation method adopts wet separation, which not only causes pollution of residual coal slime after washing, but also has large water consumption and high investment, such as coal separation by using a dense medium cyclone and a hydraulic jigger. More than two thirds of the coal reserves in China are distributed in Shaanxi, inner Mongolia and Shanxi places with severe drought and water shortage. Therefore, a new dry sorting technique and equipment are urgently needed. Therefore, in recent years, air dense medium coal separators, such as dry fluidized bed coal separation methods and devices developed by the academy of mining industry of china, are gradually appeared in the field of coal separation, and are specifically referred to as CN 1005314A. Moreover, the technology is mature, and many Tangshan heavy industry enterprises are producing the products. The air-to-air coal separator has the defects that firstly, the air-to-air coal separator has requirements on the selected raw coal, the air distribution plate can be directly blocked when the water content of the raw coal is too large, and the moisture is only removed when the coal is dried, so that a large amount of heat is wasted, and the energy consumption is very serious although water is saved; secondly, the heavy medium is used in the equipment, the heavy medium is generally iron powder, the concentrate and the tailings need to be subjected to medium removal after the heavy medium is separated, and the air heavy medium bed needs to be supplemented with the medium frequently, so that the separation cost is increased, the clean coal is possibly polluted, and the current higher and higher requirements on the pure coal cannot be met; thirdly, small-particle non-ferromagnetic metal ore impurities such as copper impurities in the coal cannot be processed, the particle size fraction of the metal ore is small, the metal ore is easily carried by coal dust and coal particles in an air bed and is selected into clean coal, namely the metal ore is not easily discharged completely during dense medium separation, and the metal ore cannot be separated completely during a magnetic separation medium recovery stage.
The wind jigging dry coal separator, such as CN2889496Y, uses the combined motion of vibration of sieve plate, general ventilation and pulse wind to achieve the separation purpose, and finally can separate the pyrite ore particles, clean coal and gangue. However, this coal separator only removes the sulfur and iron ore particles by gravity separation, and has a low precision, and sometimes needs to perform magnetic separation again (flotation can also remove the iron ore particles, but as an area using a dry coal separation method, water resources are scarce, and flotation is hardly used for coal separation), which increases the separation cost. And some pure iron such as broken screws cannot penetrate through the screen plate and are discharged together with the gangue, so that waste is caused. The research on air distribution in the patent is only in the primary stage, and a person skilled in the art cannot know how to use air to arrange air volume regulating valves on each branch channel for regulating the air volume of each small air chamber to achieve uniform air volume of the whole sorting bed or regulate the air volumes of different parts of the sorting bed according to requirements to achieve the ideal requirement of sorting materials. ".
Disclosure of Invention
The invention aims to provide a dry coal preparation method to solve the defects of dry coal preparation in the prior art.
The invention is realized by the following method:
the dry coal dressing method adopts the steps of crushing, heating, temperature identification discharge, air separation and chain discharge, and divides raw coal into final clean coal, gangue and metal impurities.
More preferably, the crushing step is that raw coal enters an A-belt conveyor belt from a feeding trough, a crushing roller is arranged on the A-belt conveyor belt, crushing blocks are arranged on the circumference of the crushing roller, and the crushing blocks are in high-elasticity connection with a main body of the crushing roller to crush the raw coal into specified selected particle size;
the heating is arranged above the belt conveyer belt, and the rear part of the crushing roller is connected with a heating structure for drying the crushed coal and removing excessive water in the raw coal;
temperature identification discharge, wherein a temperature detection and discharge structure is arranged at the discharge end of the conveyor belt A and is used for identifying and discharging metal impurities, and the metal impurities are discharged to a metal impurity discharge port;
the air separation and the chain type material discharge are carried out in an air separation chamber, an annular chain structure is arranged in the air separation chamber and is positioned below a temperature detection and discharge structure, the annular chain structure is arranged in a triangular mode, the whole annular chain structure is connected with an excitation structure, under the combined action of an air distribution plate and the excitation structure, coal materials slide down along an inclined plane formed by chain plates, separated clean coal falls into a clean coal discharge port, gangue falls into a gangue discharge port, a metal impurity discharge port is also arranged at the lower part of the annular chain structure in the air separation chamber and is positioned at the opposite side of the clean coal discharge port, and the expanded chain plates push metal impurities to the metal impurity discharge port;
more preferably, the air distribution plate is arranged in parallel with the corresponding chain plate.
More preferably, the controller is connected to the crushing roller, the endless belt conveyor, the temperature sensing and discharge structure, the heating structure, the air supply fan and the endless chain structure, and the controller has a human-machine interface for allowing the manual input of the operating parameters of these structures.
More preferably, the air distribution plate is divided into two areas, wherein the upper part of the air distribution plate is a pulse air area, and the lower part of the air distribution plate is a continuous strong air area.
More preferably, the link plates are at 90 degrees to the endless chain when opened and maintained at that angle until the link plates are transferred to the coal transport section.
The invention has the beneficial effects that:
1) the advantages of the chain discharging and air jigging inclined-plane sieve plate of the air heavy medium coal separator in the prior art are integrated, heavy media are not used, the separation cost is greatly reduced, and water and electricity are saved;
2) the heat of the dried raw coal is fully utilized, the temperature sensor is used for identifying the metal impurities and discharging the metal impurities before the metal impurities enter the winnowing process, and the chain plates are also used for uniformly recovering the metal impurities which are subsequently and further separated, so that the metal impurities are recovered with higher purity, and the waste of metal resources is prevented;
3) the wind distribution plate supplies pulse wind and continuous strong wind in different areas to lock light gray matter; the gray matter can be combined with water vapor generated by heating raw coal before, so that the gray matter can be recovered conveniently.
Drawings
Fig. 1 is a schematic structural diagram of a dry coal separator.
In the figure: 1. the device comprises a feeding trough, 2 a first belt conveyor belt, 3 a controller, 4a metal impurity discharge port, 5 a chain plate, 6 an air distribution plate, 7 a gangue discharge port, 8 a clean coal discharge port, 9 a chain wheel, 10 an air supply bus, 11 an air supply machine, 12 a dust remover, 13 a temperature detection discharge structure, 14a heating structure and 15 a crushing roller.
Detailed Description
The following is further described with reference to the accompanying drawings:
as shown in figure 1, the dry coal separator comprises a separator main body, a feeding chute 1 is arranged above the separator main body, an A-belt conveyor belt 2 is arranged below the feeding chute, a crushing roller 15 is arranged on the A-belt conveyor belt 2 and used for crushing raw coal into specified selected granularity, the A-belt conveyor belt 2 is a rubber conveyor belt and is covered with a metal plate, a crushing base plane with high strength can be provided for crushing, crushing blocks are arranged on the circumference of the crushing roller and are in high-elasticity connection with the crushing roller main body, and if waste rocks with excessive hardness are encountered, the crushing blocks retract to the crushing roller main body, so that the crushing roller can be prevented from being damaged or the whole separation production line can be prevented from being stopped. The crushing roller 15 is connected with a heating structure 14, the heating structure is used for drying crushed coal, removing excessive moisture in raw coal, and preventing over-wet coal powder from blocking air holes in a chain plate during later separation, and the heating structure per se is the prior art and is not described herein again. The temperature detection discharge structure 13 is arranged at the discharge end of the first belt conveyor 2, because the inventor finds that the temperature of metal impurities such as pyrite ore particles, broken screws, copper ore particles and the like is higher than that of coal particles during heating in actual sorting operation, and therefore by utilizing the characteristic, the metal impurities are heated to a temperature which is enough to be separated from the coal while the heating structure 14 removes redundant moisture of raw coal, so that the temperature detection discharge structure 13 can identify and remove the metal impurities through temperature detection, most of the metal impurities are removed before entering air separation, and cannot enter subsequent sorting.
The coal material enters the air separation chamber after being separated by the temperature detection discharge structure 13, an annular chain structure is arranged in the air separation chamber, the whole annular chain structure is connected with the excitation structure, the annular chain structure is supported by three chain wheels 9 inside to form a triangular structure, a plurality of chain plates 5 are mounted on the annular chain structure, one ends of the chain plates 5 are pivoted on the annular chain structure, when the chain plates 5 are positioned on the coal material falling side, the chain plates 5 form a plane for conveying the coal material, the chain plates 5 are positioned below the annular chain structure or on the discharged metal impurity running track side, and the chain plates 5 rotate and are in an opening state. Preferably, the link plates 5 are at 90 degrees to the endless chain when opened. The chain plate 5 is provided with a plurality of air holes, and the air blown by the air distribution plate 6 can act on the coal flow through the air holes. The wind distribution plates are preferably arranged parallel to the respective tie plates. The wind power and the excitation structure of the wind distribution plate 6 jointly act on the coal material flow, the wind distribution plate 6 is divided into two areas, a pulse wind area is arranged above the wind distribution plate, coal particles and gangue particles are layered in the area through pulse wind, and the coal particles are arranged on the gangue particles. When coal material flows through the lower area of the air distribution plate 6, the strong wind blown by the air distribution plate separates coal particles from gangue, clean coal falls into a clean coal discharge port 8, the gangue falls into a gangue discharge port 7, the pulse wind of the air distribution plate throws gray matter into the air, and the gray matter turns back after meeting the continuous wind such as strong wind, namely is locked in a certain area and then is captured by the dust remover 12. This makes it possible to prevent the gray matter from being discharged from the clean coal discharge port 8 and the gangue discharge port 7 by mistake. In addition, the coal material inclines downwards on the annular chain structure, the pressure between the coal material and the chain plate 5 is reduced under the action of wind force, so that the friction force is also reduced, the coal material flow moves along the surface of the annular chain faster under the component force of gravity, and the sorting is accelerated and the output of the transportation power of the annular chain structure is reduced. The angle of the inclined air separation surface can be selected by a person skilled in the art, and the angle is not too large, otherwise the coal flow cannot be controlled.
In the air separation stage, the pyrite particles which are not discharged in the temperature impurity removal stage fall to the bottom of the air separation chamber through the air holes in the chain plates and are pushed to the metal impurity discharge opening 4 by the chain plates below the annular chain structure. When the discharged metal impurities fall towards the metal impurity discharge opening 4 in the temperature impurity discharge stage, if the metal impurities are blocked by the opened chain plate 5, the metal impurities slide to the bottom of the air separation chamber and are also pushed towards the metal impurity discharge opening 4. In this way, the metal impurities are separated from the coal stream at a higher purity for later recovery.
The air distribution plate 6, the dust remover 12, the air supply fan 11 and the air supply bus 10 form an air flow circulation, and water vapor generated after the coal is heated by the heating structure 14 is introduced into the air flow circulation and is combined with the gray matter to be beneficial to the settlement of the gray matter in the dust remover 12.
The controller 3 is connected with the crushing roller 15, the belt conveyer belt 2, the temperature detecting and discharging structure 13, the heating structure 14, the air supply fan 11 and the annular chain structure, and the controller 3 is provided with a human-computer interface, so that the operation parameters of the structures can be manually input, and the whole sorting process is stable.
While the disclosed dry coal preparation process has been particularly described with reference to the examples, the above-described examples are illustrative and not intended to be limiting, and all changes and modifications that come within the spirit of the invention are desired to be protected.
Claims (1)
1. A dry coal dressing method adopts the steps of crushing, heating, temperature identification discharge, air separation and chain discharge, and divides raw coal into final clean coal, gangue and metal impurities;
the raw coal is crushed into raw coal, the raw coal enters an A-belt conveyor belt from a feeding chute, a crushing roller is arranged on the A-belt conveyor belt, crushing blocks are arranged on the circumference of the crushing roller, and the crushing blocks are in high-elasticity connection with a main body of the crushing roller to crush the raw coal into specified selected particle sizes;
the heating is arranged above the belt conveyer belt, and the rear part of the crushing roller is connected with a heating structure for drying the crushed coal and removing excessive water in the raw coal;
temperature identification discharge, wherein a temperature detection discharge structure is arranged at the discharge end of the conveyor belt A and is used for identifying and discharging metal impurities, and the metal impurities are discharged to a metal impurity discharge port;
the air separation and the chain type material discharge are carried out in an air separation chamber, an annular chain structure is arranged below a temperature detection discharge structure in the air separation chamber, the whole annular chain structure is connected with an excitation structure, the whole annular chain structure is connected with the excitation structure, under the combined action of an air distribution plate and the excitation structure, coal materials slide down along an inclined plane formed by chain plates, separated clean coal falls into a clean coal discharge port, gangue falls into a gangue discharge port, a metal impurity discharge port is also arranged at the lower part of the annular chain structure in the air separation chamber and is positioned at the opposite side of the clean coal discharge port, and the expanded chain plates push metal impurities to the metal impurity discharge port;
the air distribution plate, the dust remover, the air supply machine and the air supply bus form airflow circulation, and the gray matter is combined with the water vapor generated by heating the raw coal before, so that the gray matter is convenient to recover;
the air separation chamber of the dry type coal separation separator is adopted, the air separation chamber is provided with an annular chain structure, the annular chain structure is supported by three chain wheels (9) inside the air separation chamber to form a triangular structure, a plurality of chain plates (5) are arranged on the annular chain structure, a plurality of air holes are formed in the chain plates and used for distributing air, and the air blown out by an air distribution plate (6) acts on coal material flow through the air holes;
the method is characterized in that: one end of a chain plate (5) is pivoted on the annular chain structure, when the chain plate is positioned on the coal falling side, the chain plate forms a plane for conveying the coal, the chain plate (5) is positioned below the annular chain structure or on the side of the running track of the discharged metal impurities, the chain plate (5) rotates and is in an opening state, an air distribution plate is arranged below the chain plate on the coal falling side and is parallel to the corresponding chain plate, the air distribution plate is divided into two areas, a pulse air area is arranged close to the upper part of the air distribution plate, and a continuous strong air area is arranged at the lower part of the air distribution plate; the chain plate (5) forms an angle of 90 degrees with the annular chain when being opened;
in the air separation stage, the pyrite particles which are not discharged in the temperature impurity removal stage fall to the bottom of the air separation chamber through air holes in the chain plates and are pushed to a metal impurity discharge port by the chain plates below the annular chain structure; in the temperature impurity removing stage, when the discharged metal impurities fall towards the metal impurity discharging opening, if the metal impurities are blocked by the opened chain plate, the metal impurities can slide to the bottom of the air separation chamber and are also pushed towards the metal impurity discharging opening, and the metal impurities are separated from the coal material flow with higher purity, so that the metal impurities can be conveniently recovered at the later stage; the heating structure can prevent the over-wet coal powder from blocking the wind holes on the chain plate during the later separation besides the thermal separation, and the evaporated steam can settle the gray matter in the next flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510498724.8A CN104998715B (en) | 2014-03-14 | 2014-03-14 | Dry coal dressing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410094591.3A CN103801426B (en) | 2014-03-14 | 2014-03-14 | A kind of dry type coal preparation method |
| CN201510498724.8A CN104998715B (en) | 2014-03-14 | 2014-03-14 | Dry coal dressing method |
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| CN201410094591.3A Division CN103801426B (en) | 2014-03-14 | 2014-03-14 | A kind of dry type coal preparation method |
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| CN104998715A CN104998715A (en) | 2015-10-28 |
| CN104998715B true CN104998715B (en) | 2020-12-18 |
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| CN201510511980.6A Pending CN104998745A (en) | 2014-03-14 | 2014-03-14 | Dry type coal dressing method |
| CN201410094591.3A Active CN103801426B (en) | 2014-03-14 | 2014-03-14 | A kind of dry type coal preparation method |
| CN201510498724.8A Active CN104998715B (en) | 2014-03-14 | 2014-03-14 | Dry coal dressing method |
| CN201510506084.0A Pending CN105057023A (en) | 2014-03-14 | 2014-03-14 | Dry coal dressing method |
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| CN105149073A (en) * | 2015-10-09 | 2015-12-16 | 湖南万通科技有限公司 | Feeding crushing device |
| CN105363520B (en) * | 2015-11-13 | 2017-10-13 | 中国矿业大学 | A kind of hydraulic roll breaker |
| CN106290457B (en) * | 2016-08-15 | 2018-11-20 | 唐山昂里智能科技有限公司 | A kind of method and special equipment based on temperature identification coal and gangue |
| CN107676093B (en) * | 2017-10-17 | 2019-03-08 | 河南理工大学 | The recognition methods of microwave irradiation-infra-red detection coal, cash |
| CN112266807B (en) * | 2019-04-12 | 2021-11-16 | 新沂市久元矿业有限公司 | Coal desulfurization device |
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| CN110404824A (en) * | 2019-08-21 | 2019-11-05 | 桂林电子科技大学 | A kind of raw coal and the quick sorting unit of gangue and method |
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| CN114308655B (en) * | 2021-12-24 | 2022-11-25 | 安徽理工大学 | Annular coal gangue sorting device and using method thereof |
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| CN2897426Y (en) * | 2006-04-26 | 2007-05-09 | 张占栋 | Caterpillar spreading roller press with concave frid |
| CN2889496Y (en) * | 2006-04-27 | 2007-04-18 | 唐山陆凯科技有限公司 | Wind-powered jigging dry method coal separator |
| CN102076431A (en) * | 2008-09-11 | 2011-05-25 | 技术资源有限公司 | Sorting mined material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105057023A (en) | 2015-11-18 |
| CN104998715A (en) | 2015-10-28 |
| CN103801426B (en) | 2015-09-30 |
| CN104998745A (en) | 2015-10-28 |
| CN103801426A (en) | 2014-05-21 |
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