CN111841846A - Efficient water-saving type coal resource upgrading process for underground separation and pre-discharge of gangue - Google Patents

Abstract

The invention discloses a high-efficiency water-saving underground coal resource upgrading process for sorting and pre-discharging gangue. The raw coal in the mining area is transported to a crusher by a belt conveyor for crushing, and the crushed materials are sent to a strong vibration grading screen for screening. The fine materials under the sieve are sent to the underground raw coal bunker by the belt conveyor; the raw coal on the sieve first enters the composite dry separator for pre-discharge, and then the pre-discharged material is sent to the X-ray sorting machine. X-ray sorting After machine separation, clean coal and a small amount of gangue are obtained, and this part of gangue and the gangue of the pre-discharged gangue are crushed and stirred and sent back to the goaf; the invention reduces the amount of underground gangue transportation and lift, relieves the auxiliary transportation pressure of the mine, and can reduce the amount of ground gangue. The gangue occupies land, protects the natural environment, and has good prospects for social benefits. At the same time, it also reduces the cost of subsequent sorting. The gangue discharged from the well is used for goaf backfill treatment, reducing the hidden danger of gob collapse and greatly improving social and economic benefits.

Description

A high-efficiency water-saving underground sorting and pre-discharge coal resource upgrading process

technical field

The invention relates to the field of coal resources, in particular to a high-efficiency water-saving type underground sorting and pre-discharge coal resource upgrading process.

Background technique

With the gradual improvement of the degree of coal mining mechanization, during the mining process, a large amount of top, bottom plate and gangue are mixed into the raw coal, and the gangue content of the raw coal is greatly increased. The large gangue content will cause serious wear and tear of equipment and pipelines in the coal preparation plant and increase the medium loss. In order to save costs and improve production efficiency, it is very necessary to pre-drain and sort underground raw coal; over-exploitation of ore resources will inevitably lead to changes in the original ecological environment of the mine: such as vegetation destruction, waste rock Problems such as mountain formation and groundwater decline, a large amount of gangue discharged from coal production accumulates into gangue mountains, occupying a lot of farmland and green space, causing surface pollution, and the stacking of gangue will cause spontaneous combustion, acid rain and other disasters; in addition, coal mining will form underground Goaf, causing the disaster of ground collapse, and transporting the gangue from underground to the ground and transporting the filler from the well to the underground requires a lot of investment. The use of underground sorting gangue backfill technology can reduce the accumulation of gangue on the ground and avoid mining. The collapse of the empty area can also save economic costs and protect the environment.

SUMMARY OF THE INVENTION

Aiming at the above-mentioned technical deficiencies, the purpose of the present invention is to provide a high-efficiency water-saving type underground sorting and pre-discharge coal resource upgrading process, which has stable and reliable operation, low production cost, high labor productivity, good dust removal effect, and no Water has a wide range of practicability, which can greatly improve economic and social benefits.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

The invention provides a high-efficiency water-saving type coal resource upgrading process for underground sorting and pre-discharge of gangue, which comprises the following steps:

S1. The raw coal is transported to the crushing device, and after being crushed by the crushing device, it is sent to a powerful grading screen for screening, and the material under the grading screen is sent to the underground raw coal bunker, and finally sent to the ground raw coal bunker;

S2. The sieve of the grading sieve is sent to the composite dry separator for pre-discharge of gangue, and most of the gangue is discharged;

S3. The raw coal obtained after the pre-discharge of the gangue by the composite dry separator is sent to the X-ray separator for sorting, and the gangue and clean coal are obtained after sorting;

S4. The clean coal obtained by the X-ray separator is sent to the underground clean coal bunker, and finally sent to the ground clean coal bunker;

S5. The gangue obtained by the X-ray separator in step S3 and the gangue obtained by the composite dry separator in step S2 are both sent to the pulverizing device, and after being pulverized by the pulverizing device, sent to the stirring device for pulping, After pulping, it is transported to the goaf for backfilling by a conveying pump.

Preferably, a 40mm specification strong vibration grading sieve is used for the strong grading and screening in step S1.

Preferably, in step S1, the raw coal is transported to the crushing device by a belt conveyor.

Preferably, the crushing device in step S1 selects a crusher.

Preferably, a pulverizer is selected as the pulverizing device in step S5.

The beneficial effects of the present invention are:

1. The method adopts the composite dry separation method to pre-discharge the gangue, and at the same time, the gangue selected from the well is directly used for the backfilling of the goaf;

2. The present invention improves the recovery rate of coal, reduces costs such as gangue out-well, coal gangue separation, etc., and simultaneously reduces the gangue floor area and the hazards such as spontaneous combustion and acid rain caused by gangue ground stacking;

3. The present invention not only reduces the land occupied by the ground gangue, but also protects the natural environment, with good prospects for social benefits and good economic benefits;

4. The technological process of the present invention has the advantages of simple operation, convenient maintenance, low energy consumption, no water use, low production cost and wide practicability.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

FIG. 1 is a flow chart of a high-efficiency water-saving downhole sorting and pre-discharge coal resource upgrading process provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

A high-efficiency water-saving coal resource upgrading process for underground sorting and pre-discharge of gangue adopts a modular design, and mainly includes a crushing and screening module, a pre-discharge gangue module, an X-ray sorting module and a filling module. The crushing and screening module includes: Crusher and screening device are used to ensure a reasonable range of feed particle size for the composite dry separator and X-ray separator. The screening device uses a powerful vibration grading screen, and the pre-discharge module is mainly a composite dry separator. The sorting machine is used to pre-discharge gangue, which reduces the amount of underground gangue transportation and lifting, relieves the pressure of auxiliary transportation in the mine, and saves the cost of subsequent sorting. The X-ray sorting machine module is mainly an X-ray sorting machine. The pulverizer has a reasonable feeding range. The filling module mainly includes a pulverizer and a mixer, so that the gangue is mixed with water to form a homogeneous slurry, which is used for backfilling of the gob; the process flow is shown in Figure 1, which includes the following steps:

S1. The raw coal is transported to the crusher by the belt conveyor. After being crushed by the crusher, it is sent to the 40mm strong vibration grading screen for screening. The -40mm fine materials under the screen are directly sent to the underground raw coal bunker by the belt conveyor, and finally sent to the ground raw coal bunker ;

S2. The 40-200mm raw coal on the sieve first enters the composite dry separator for pre-discharge of gangue, and most of the gangue is discharged; the pre-discharge of gangue not only improves the production efficiency, but also realizes the efficient use of coal resources;

S3. The material obtained after pre-discharging the gangue by the composite dry separator is sent to the X-ray separator for sorting, and clean coal and a small amount of gangue are obtained after sorting;

S4. The clean coal obtained by the X-ray separator is sent to the underground clean coal bunker, and finally sent to the ground clean coal bunker;

S5. The gangue obtained by the X-ray separator in step S3 and the gangue obtained by the composite dry separator in step S2 are both sent to the pulverizer, and after being pulverized by the pulverizer, they are sent to the mixer for pulping, and the After the slurry is transported to the goaf by the conveying pump for backfilling.

Using the slurry backfill technology, the gangue is crushed into mud to fill the goaf densely, so that the discharged gangue can be utilized and the hidden safety hazard of subsequent goaf collapse can be eliminated.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these 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 these 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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