AU2018208634B2

AU2018208634B2 - Clean and efficient coal mining method

Info

Publication number: AU2018208634B2
Application number: AU2018208634A
Authority: AU
Inventors: Zhengzheng Xie; Nong Zhang; Junyao ZHOU
Original assignee: China University of Mining and Technology CUMT; China University of Mining and Technology Beijing CUMTB
Current assignee: China University of Mining and Technology Beijing CUMTB
Priority date: 2017-12-08
Filing date: 2018-03-13
Publication date: 2020-01-02
Anticipated expiration: 2038-03-13
Also published as: WO2019109535A1; CN108331580B; JP6688397B2; CN108331580A; AU2018208634A1; JP2020506309A; US20210189876A1

Abstract

The present invention relates to a clean and efficient coal mining method, which is applicable to the field of solid waste treatment in mines. The method is characterized in: the width of short-segment working faces is designed according to the discharge volume of solid wastes produced in a mine, including downhole gangue and surface coal ash; first, two adjacent short-segment working faces are mined and backfilled, and the edges of the filling face and the solid coal side are supported with anchor rods while roadways are retained; the roadways retained at the two short-segment working faces and the coal mass in the middle constitute a long-segment working face mining system; the long-segment working face is mined, the short-segment backfilled working faces at the two sides are mined and backfilled at the same time, and the gangue produced at the long-segment working face is transported to the short-segment working faces to fill, so that a continuous mining system that consists of backfill mining at short-segment working faces and efficient stoping at long-segment working faces is realized. The method provided in the present invention can deal with all surface and downhole solid wastes in a mine, reduces the cost of gangue treatment, and mitigates damages to the ecological environment; besides, the method utilizes solid wastes to fill the gobs to form roadways, eliminates coal pillars and improve resource recovery rate. Fig. 3

Description

Clean and Efficient Coal Mining Method

Technical Field

The present invention relates to a clean and efficient coal mining method, which is especially

applicable to the field of solid waste treatment in mines.

Background Art

As the national resources are consolidated continuously, more and more large-size mines with

10 million tons/year or higher annual yield emerge, and solid wastes generated in the mines

increase explosively. The solid wastes in coal mines are mainly gangue, washing gangue, and

coal ash. At present, the solid wastes are mainly disposed by centralized open dumping.

Consequently, the solid wastes not only result in damages to the ecological environment in

the mine field, but also bring severe threats to the living environment of people in the mine

field.

According to the general planning and requirements of China, constructing new and modern

coal mines is the direction of development of the coal industry in the future, and promoting

safe and low-carbon operation and sustainable development of the coal mines is the general

objective. Therefore, the approach of treatment of solid wastes in mines must be changed, and

a new model of comprehensive utilization of solid wastes in mine fields as resources must be

explored. In recent years, some approaches of comprehensive utilization of the solid wastes

have been put forward by coal mine enterprises, such as power generation using solid wastes,

production of building materials, recovery of valuable minerals, production of chemical

materials, soil improvement, production of fertilizers, backfilling (including building

backfilling, low-lying land and waste-land backfilling, mine gob filling, reclamation of

11840089_1 (GHMaers) P109323.AU subsidence area in coal mines), and road building, etc. However, those approaches can't solve the solid waste treatment problem thoroughly. At present, there is no coal mining method that can be used to treat surface solid wastes quickly while avoiding lifting up downhole solid wastes.

Summary of the Invention

An embodiment of the present invention may provide a clean and efficient coal mining

method that can be used to treat surface solid wastes quickly while avoiding lifting up

downhole solid wastes.

An aspect of the disclosure provides clean and efficient coal mining method comprises the

following steps:

a. calculating the volume of existing solid wastes produced in a mine, and the solid wastes

include downhole gangue, surface gangue, and coal ash;

b. arranging a long-segment working face for filling solid wastes in the mine in the coal seam

in the mine field, arranging short-segment working faces I and II in width w at the two sides

of the long-segment working face respectively, using mining equipment, including coal cutter,

hydraulic support and belt conveyer, at the short-segment working faces I and II to

simultaneously mine at the short-segment working faces I and II, backfilling at the

short-segment working faces I and II with the existing solid wastes in the mine and the

gangue produced in the mining, and supporting edges of a filling face and a solid coal side of

the short-segment working faces I and II with anchor rods while retaining roadways at the

two sides of the filling face;

c. excavating open-off cuts using a heading machine between the short-segment working face

I and the short-segment working face II after the mining at the short-segment working faces I

and II is finished, so that the retained roadways at the short-segment working faces I and II

and the open-off cuts form a long-segment working face mining system;

11840089_1 (GHMaers) P109323.AU d. mining at the long-segment working face I, wherein the mining equipment at the short-segment working face I is transported to a short-segment working face III at the left side to mine and the mining equipment at the short-segment working face II is transported to a short-segment working face IV at the right side to mine, wherein gangue produced in the mining at the long-segment working face I is transported to the short-segment working faces

III and IV, wherein a gob that is formed after the mining at the long-segment working face I is

finished is collapsed directly;

e. excavating open-off cuts respectively after the mining at the short-segment working faces

III and IV is finished, arranging long-segment working faces II and III respectively, and repeating step d to allow for continuous mining that comprise backfill mining at the

short-segment working faces, and efficient stoping at the long-segment working faces until

mining of the entire coal seam in the mine field is completed.

All short-segment working faces may have the same width, and the width can be determined

with a formula w=Q/(2*h), and w60m, wherein Q is quantity of the solid wastes, I is the

length of the short-segment working face, and h is the mining height at the short-segment

working face.

All long-segment working faces may have a width of 150m~300m.

The roadways retained after the filling of the short-segment working faces may have a width

of 4~6m.

With the above technical scheme, embodiments of the present invention may have the

following advantages over the prior art:

(1) All solid wastes in the mine can be filled to the short-segment working faces, so that the

problem of surface solid waste dumping is solved while the requirement of avoiding the lifting of downhole solid wastes is attained; thus, the cost of gangue treatment is reduced, the

damages to the ecological environment are mitigated, and the sustainable development of the

mine is improved.

11840089_1 (GHMaers) P109323.AU

(2) The short-segment working faces at the two sides are backfill-mined at the same time

after the stoping at the long-segment working face is finished, and thereby a continuous

mining system that consists of backfill mining at the short-segment working faces and efficient stoping at the long-segment working faces is realized.

(3) The solid wastes are utilized to fill the gobs at the short-segment working faces to form

roadways; thus, coal pillars are eliminated and the resource recovery rate is improved.

Description of Drawings

Embodiments will now be described by way of example only with reference to the

non-limiting Figures.

Fig. 1-3 show a schematic diagram of the clean and efficient coal mining method according

to an embodiment of the present invention.

In the figure: 11 - short-segment working face I; 12 - short-segment working face II; 13

short-segment working face III; 14 - short-segment working face IV; 21 - long-segment

working face I; 22 - long-segment working face II; 23 - long-segment working face III; 3

retained roadway; 4 - open-off cut; 5 - gob.

Embodiments

Hereunder the present invention will be further detailed in an embodiment with reference to

the accompanying drawings.

As shown in Figs. 1, 2 and 3, the clean and efficient coal mining method provided in an

embodiment of the present invention comprises the following steps:

include downhole gangue, surface gangue, and coal ash;

11840089_1 (GHMaers) P109323.AU b. arranging a long-segment working face 21 in width of 150m~300m for filling solid wastes in the mine in the coal seam in a mine field, arranging short-segment working faces I 11 and

II 12 in width of w at the two sides of the long-segment working face 21 respectively, wherein, all short-segment working faces have the same width calculated with a formula

w=Q/(21*h), and w<60m, the specific dimension depends on the quantity Q of the solid

wastes, wherein, I is the length of the short-segment working faces, and h is the mining height

at the short-segment working faces; commissioning the equipment, including coal cutter, hydraulic support and belt conveyer, at the short-segment working faces I 11 and II 12,

mining at the short-segment working faces I and II simultaneously, filling with the existing

solid wastes in the mine and the gangues produced in the mining, supporting the edges of the

filling face and the solid coal side with anchor rods while retaining roadways 3 at the two sides of the filling face, wherein, the roadways 3 retained after the two short-segment

working faces are filled has a width of 4~6m;

c. utilizing a heading machine to excavate open-off cuts 4 between the short-segment

working face I 11 and the short-segment working face II 12 after the mining at the

short-segment working faces I 11 and 1112 is finished, so that the roadways 31 retained at the short-segment working faces I 11 and 11 12 and the open-off cuts 4 constitute a long-segment

working face mining system;

d. mining at the long-segment working face I21, while transporting the mining equipment at the short-segment working face I 11 to a short-segment working face III 14 at the left side to

mine, and transporting the mining equipment at the short-segment working face II 12 to a

short-segment working face IV 13 at the right side to mine, and transporting the gangue produced in the mining at the long-segment working face 21 to the short-segment working

faces III 14 and IV 13 to fill, letting a gob 5 formed after the mining at the long-segment working face I21 is finished collapse directly;

III 14 and IV 13 is finished, arranging long-segment working faces II 22 and III 23

11840089_1 (GHMaers) P109323.AU respectively, and repeating the step d, so that continuous mining that consists of backfill mining at short-segment working faces, and efficient stoping at the long-segment working faces is realized, and the mining of the entire coal seam in the mine field is completed in that way.

In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense,

i.e. to specify the presence of the stated features but not to preclude the presence or addition

of further features in various embodiments of the invention.

11840089_1 (GHMaers) P109323.AU

Claims

1. A clean and efficient coal mining method, comprising the following steps:

a. calculating the volume of existing solid wastes produced in a mine, and the solid

wastes include downhole gangue, surface gangue, and coal ash;

b. arranging a long-segment working face I for filling solid wastes in the mine in the coal seam in the mine field, arranging short-segment working faces I and II in width

of w at the two sides of the long-segment working face I respectively, using mining

equipment, including coal cutter, hydraulic support and belt conveyer, at the short-segment working faces I and II to simultaneously mine at the short-segment

working faces I and II, back filling at the short-segment working faces I and II with

the existing solid wastes in the mine and the gangue produced in the mining, and

supporting edges of a filling face and a solid coal side of the short-segment working faces I and II with anchor rods while retaining roadways at the two sides of the

filling face;

c. excavating open-off cuts using a heading machine between the short-segment working face I and the short-segment working face II after the mining at the

short-segment working faces I and II is finished, so that the retained roadways at the

short-segment working faces I and II and the open-off cuts form a long-segment working face mining system;

d. mining at the long-segment working face I, wherein the mining equipment at the

short-segment working face I is transported to a short-segment working face III at

the left side to mine and the mining equipment at the short-segment working face II

is transported to a short-segment working face IV at the right side to mine, wherein gangue produced in the mining at the long-segment working face I is transported to the short-segment working faces III and IV, wherein a gob that is formed after the

mining at the long-segment working face I is finished is collapse directly;

11840089_1 (GHMaers) P109323.AU e. excavating open-off cuts respectively after the mining at the short-segment working faces III and IV is finished, arranging long-segment working faces II and III respectively, and repeating step d to allow for continuous mining that comprises backfill mining at the short-segment working faces, and efficient stoping at the long-segment working faces until mining of the entire coal seam in the mine field is completed.

2. The clean and efficient coal mining method according to claim 1, wherein: all

short-segment working faces have the same width calculated with a formula w=Q/(2*h),

wherein w<60m, Q is the quantity of the solid wastes, I is the length of the short-segment

working face, and h is the mining height at the short-segment working face.

3. The clean and efficient coal mining method according to either claim 1 or 2, wherein: the long-segment working faces have width of 150m~300m.

4. The clean and efficient coal mining method according to any one of the preceding claims, wherein: the retained roadways after the filling of two short-segment working faces have

a width of 4~6m.

11840089_1 (GHMaers) P109323.AU