CN111841846A - Efficient water-saving type coal resource upgrading process for underground separation and pre-discharge of gangue - Google Patents
Efficient water-saving type coal resource upgrading process for underground separation and pre-discharge of gangue Download PDFInfo
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- CN111841846A CN111841846A CN202010716178.1A CN202010716178A CN111841846A CN 111841846 A CN111841846 A CN 111841846A CN 202010716178 A CN202010716178 A CN 202010716178A CN 111841846 A CN111841846 A CN 111841846A
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- gangue
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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
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
Abstract
The invention discloses a high-efficiency water-saving coal resource upgrading process for underground separation and pre-discharge of waste rocks, wherein raw coal in a mining area is conveyed to a crusher through a belt conveyer to be crushed, crushed materials are conveyed into a powerful vibration grading sieve to be sieved, and undersize fine materials are conveyed to an underground raw coal bin through the belt conveyer; the method comprises the following steps that (1) raw coal on a screen enters a composite dry-method separator for pre-discharging gangue, then the material subjected to pre-discharging gangue is sent to an X-ray separator, cleaned coal and a small amount of gangue are obtained after separation by the X-ray separator, and the part of gangue and the gangue subjected to pre-discharging gangue are crushed and stirred and then sent back to a goaf; the invention reduces the lifting amount of underground waste rock transportation, relieves the auxiliary transportation pressure of a mine, can reduce the land occupation of the waste rock on the ground, protects the natural environment, has good social benefit prospect, simultaneously reduces the subsequent separation cost, reduces the hidden danger of collapse of a goaf when the waste rock discharged underground is used for backfilling the goaf, and greatly improves the social benefit and the economic benefit.
Description
Technical Field
The invention relates to the field of coal resources, in particular to a high-efficiency water-saving coal resource upgrading process for underground separation and pre-discharge of gangue.
Background
Along with the gradual improvement of the coal mining mechanization degree, in the mining process, a large amount of top plates, bottom plates and gangue are mixed into raw coal, the gangue content of the raw coal is greatly improved, the abrasion of equipment and pipelines of a coal preparation plant is serious due to the large content of the gangue, the medium loss and the coal preparation cost are increased, and the pre-gangue discharge and the separation of underground raw coal are very necessary for saving the cost and improving the production efficiency; the excessive exploitation of ore resources inevitably leads to the change of the original ecological environment of the mine: for example, vegetation is damaged, waste rocks form hills, underground water falls and the like, a large amount of waste rocks discharged from coal production are accumulated to form the hills, a large amount of farmlands and greenbelts are occupied, the ground surface pollution is caused, and the stacking of the waste rocks can cause disasters such as spontaneous combustion, acid rain and the like; in addition, the mined out area of coal can be formed underground, which causes the ground collapse disaster, and a large amount of capital is needed to be invested in transporting the waste rock to the ground from underground and transporting the filler to underground from the well.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide the high-efficiency water-saving type coal resource upgrading process for underground separation and pre-discharge of the waste rock, which has the advantages of stable and reliable operation, low production cost, high labor productivity, good dust removal effect, no water consumption, wide practicability and capability of greatly improving the economic benefit and the social benefit.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a high-efficiency water-saving type coal resource upgrading process for underground separation and pre-discharge of gangue, which comprises the following steps:
s1, conveying the raw coal to a crushing device, crushing the raw coal by the crushing device, then conveying the crushed raw coal to a strong grading sieve for screening, conveying the undersize of the grading sieve to a downhole raw coal bunker, and finally conveying the undersize to a ground raw coal bunker;
s2, delivering oversize products of the grading screen into a composite dry separator for pre-discharging gangue, and discharging most of gangue;
s3, feeding the raw coal obtained after the gangue is pre-discharged by the composite dry separator into an X-ray separator for separation, and obtaining gangue and clean coal after separation;
s4, conveying the clean coal obtained by the X-ray separator into an underground clean coal bunker, and finally conveying the clean coal into a ground clean coal bunker;
and S5, sending the waste rock obtained by the X-ray separator in the step S3 and the waste rock obtained by the separation of the composite dry separator in the step S2 to a crushing device, crushing the waste rock by the crushing device, sending the crushed waste rock to a stirring device for pulping, and conveying the pulped waste rock to a goaf by a conveying pump for backfilling.
Preferably, the strong classifying screen in step S1 is a 40mm specification strong vibration classifying screen.
Preferably, the raw coal is transported to the crushing device by a belt conveyor in step S1.
Preferably, the crushing device in step S1 is a crusher.
Preferably, the crushing device in step S5 is a crusher.
The invention has the beneficial effects that:
1. the method adopts a composite dry method to sort and pre-discharge the waste rock, and simultaneously directly uses the waste rock sorted underground for backfilling a goaf;
2. the invention improves the recovery rate of coal, reduces the expenses of discharging waste rock out of the well, separating coal and waste rock on the well and the like, and reduces the harm of spontaneous combustion, acid rain and the like caused by the land occupation area of the waste rock and the stacking of the waste rock on the ground;
3. the invention not only reduces the land occupation of the ground gangue, but also protects the natural environment, and has good social benefit prospect and economic benefit;
4. the method has the advantages of simple process flow operation, convenient maintenance, low energy consumption, no water consumption, low production cost and wide practicability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a coal resource upgrading process for efficient water-saving underground separation and pre-discharge of gangue, which is provided by the embodiment of the invention.
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.
A high-efficiency water-saving type coal resource upgrading process for underground separation and pre-discharge of waste rock adopts a modular design and mainly comprises a crushing and screening module, a pre-discharge of waste rock module, an X-ray separation module and a filling module, wherein the crushing and screening module comprises a crusher and a screening device, the device is used for ensuring reasonable feeding granularity ranges of the composite dry method separator and the X-ray separator, the screening device adopts a strong vibration grading screen, the pre-discharge gangue module is mainly used for pre-discharging gangue for the composite dry method separator, the underground gangue transportation lifting amount is reduced, the auxiliary transportation pressure of a mine is relieved, the subsequent separation cost is saved, the X-ray separator module is mainly used for the X-ray separator, the filling module mainly comprises a pulverizer and a stirrer, so that gangue and water are mixed to form homogeneous slurry for backfilling a goaf; the process flow specifically comprises the following steps with reference to fig. 1:
s1, conveying the raw coal to a crusher through a belt conveyor, conveying the crushed raw coal to a 40mm strong vibration grading sieve for sieving, and directly conveying minus 40mm fine materials below the sieve to an underground raw coal bin through the belt conveyor, and finally conveying the fine materials to a ground raw coal bin;
s2, feeding raw coal with a size of 40-200mm on a screen into a composite dry separator for pre-discharging gangue, and discharging most of gangue; the waste rock pre-discharge not only improves the production efficiency, but also realizes the high-efficiency utilization of coal resources;
s3, feeding the materials obtained after the gangue is pre-discharged by the composite dry separator into an X-ray separator for separation, and obtaining clean coal and a small amount of gangue after separation;
s4, conveying the clean coal obtained by the X-ray separator into an underground clean coal bunker, and finally conveying the clean coal into a ground clean coal bunker;
and S5, sending the gangue obtained by the X-ray separator in the step S3 and the gangue obtained by the separation of the composite dry separator in the step S2 into a crusher, crushing the gangue by the crusher, sending the crushed gangue into a stirrer for pulping, and conveying the pulped gangue to a goaf by a conveying pump for backfilling.
By adopting a slurry backfilling technology, the waste rock is crushed into slurry to densely fill the goaf, so that the discharged waste rock is utilized, and the potential safety hazard of subsequent goaf collapse is eliminated.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. A high-efficiency water-saving type coal resource upgrading process for underground separation and pre-discharge of waste rocks is characterized by comprising the following steps:
s1, conveying the raw coal to a crushing device, crushing the raw coal by the crushing device, then conveying the crushed raw coal to a strong grading sieve for screening, conveying the undersize of the grading sieve to a downhole raw coal bunker, and finally conveying the undersize to a ground raw coal bunker;
s2, delivering oversize products of the grading screen into a composite dry separator for pre-discharging gangue, and discharging most of gangue;
s3, feeding the raw coal obtained after the gangue is pre-discharged by the composite dry separator into an X-ray separator for separation, and obtaining gangue and clean coal after separation;
s4, conveying the clean coal obtained by the X-ray separator into an underground clean coal bunker, and finally conveying the clean coal into a ground clean coal bunker;
and S5, sending the waste rock obtained by the X-ray separator in the step S3 and the waste rock obtained by the separation of the composite dry separator in the step S2 to a crushing device, crushing the waste rock by the crushing device, sending the crushed waste rock to a stirring device for pulping, and conveying the pulped waste rock to a goaf by a conveying pump for backfilling.
2. The process for upgrading a coal resource by efficiently and energy-saving underground separation and pre-discharge of gangue according to claim 1, wherein the powerful vibrating classifying screen with the specification of 40mm is used for the powerful classifying screen in the step S1.
3. The process for upgrading coal resources by efficient water-saving underground separation and pre-discharge of gangue according to claim 1, wherein in step S1, raw coal is transported to the crushing device by a belt conveyor.
4. The process for upgrading coal resources by efficient water-saving underground separation and pre-discharge of gangue as claimed in claim 1, wherein the crushing device in the step S1 is a crusher.
5. The process of upgrading coal resources by efficient water-saving underground separation and pre-discharge of gangue as claimed in claim 1, wherein the crushing device in step S5 is a crusher.
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| CN202010716178.1A CN111841846A (en) | 2020-07-23 | 2020-07-23 | Efficient water-saving type coal resource upgrading process for underground separation and pre-discharge of gangue |
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Cited By (2)
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| CN112676188A (en) * | 2020-12-29 | 2021-04-20 | 山西三元煤业股份有限公司 | Coal and gangue separation and conveying system |
| CN117282536A (en) * | 2023-11-14 | 2023-12-26 | 海南星界和光科技有限公司 | Comprehensive utilization method of coal gangue |
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