[0001] The subject of invention is method for obtaining of aggregate of the post-mining
gangue extracted in the process of classification and concentration of coal as well
as from underground preparatory works and providing coal seams works and a system
of devices for carrying out the method.
[0002] Coal mining is one of the most waste productive industries. The quality of the waste
is variable at the time and depends on the quality of coal deposits, methods of coal
seams excavation and concentration technology. So far, post-mining waste are used
occasionally, among the others in the process of mining workings backfilling in underground
coal mines.
[0003] The aim of the invention is to provide good quality aggregate that meets the DIN
EN 13242 + A1: 2010 and BS EN 3043:2004 + ACC: 2004:2004 + Ap1 : 2010 standards, which
can be used for the construction of flood levees, rail and road embankments, for the
sub base of roads and motorways, and directly as a building material.
[0004] Method for obtaining aggregate of post-mining gangue according to the invention is
characterized by that the gangue obtained in the process of classification and concentraction
of coal and from underground preparatory works and providing coal seams works, is
driven by belt conveyors to the hopper, from where is redirected through a magnetic
separator eliminating metal contamination to the selective impact crusher of first
degree comminution. The obtained product is initially screened through a double-deck
vibrating screen, wherein the under-screen product is stored as material for backfilling
of mining workings, and over-screen product is subjected to subsequent process of
crushing in impact selective crusher of the second stage of comminution and then crushing
products are targeted to triple-deck vibrating screen and undergo a process of classification.
Aggregate from gangue obtained by the method under to the invention, may be unadulterated
applied successfully in technologies, where there is effectively reduced the environmental
impact by isolating layers of sub base from moisture.
[0005] The system under the invention includes an arranged consecutively devices: hopper,
magnetic separator, selective impact crusher of first-degree comminution, double-deck
vibrating screen, selective impact crusher of second-degree comminution and triple-deck
vibrating screen , wherein the devices included in the system are joint by system
of central dedusting which captures dust generated during operation of selective impact
crusher of first-degree comminution and selective impact crusher of second degree
comminution and double-deck and triple deck vibrating screen.
[0006] The capture of dust during the process of obtaining of the aggregate improves the
purity of obtained product and has a positive influence on the environment.
[0007] Method for obtaining aggregates of post-mining gangue and device system according
to the invention will be explained on the example of realization on the basis of Figure
1.
[0008] Gangue obtained in the process of classification and concentration of coal in coal
processing plant
2 and from the underground preparatory works and providing coal seams works of the
granulation between 0-200 mm is driven by belt conveyors to the hopper
3, from where is redirected through a magnetic separator
4 eliminating metal contaminants, to the selective impact crusher
5 of the first degree of comminution. The obtained product is initially screened by
a double deck vibrating screen
6, wherein the under-screen product < 4mm is stored as material for backfilling of mining
workings , and the over-screen product > 4mm is subjected to a crushing process at
the next selective impact crusher of the second stage comminution
7, and then products of crushing the are directed to the triple-deck vibrating screen
8 and subjected to a process of classification.
As a result of the classification there is obtained full value aggregate of fraction
4 - 8mm , 8-16mm and 16 - 63 mm.
The system of devices for the obtaining aggregate of post-mining gangue contains arranged
consecutively devices: hopper
3, magnetic separator
4, selective impact crusher of first-degree comminution
5, double-deck vibrating screen
6, selective impact crusher of second-degree comminution
7, and triple-deck vibrating screen
8, wherein the devices included in the system are joint by system of central dedusting
9, which captures dust generated during operation of crushers
5 and
7 and vibrating screens
6 and
8.
1. Method for obtaining of aggregate of the post-mining gangue extracted in the process
of classification and concentration of coal as well as from underground preparatory
works and providing coal seams works which comprises of belt conveyors which drive
gangue to the hopper (3), from where is redirected through a magnetic separator (4) eliminating metal contaminants , to the selective impact crusher (5) of the first degree of comminution, wherein the product obtained from selective impact
crusher (5) is initially screened by a double deck vibrating screen (6), wherein the under-screen product is stored as material for backfilling of mining
workings, and the over-screen product is subjected of the next crushing process at
selective impact crusher of the second stage comminution (7), and then products of crushing the are directed to the triple-deck vibrating screen
(8) and subjected to a process of classification.
2. The system of devices for obtaining aggregate of post-mining gangue of Claim no. 1
which comprises of arranged consecutively devices: hopper (3), magnetic separator (4), selective impact crusher (5) of first-degree comminution, double-deck vibrating screen (6), selective impact crusher (7) of second-degree comminution, and triple-deck vibrating screen (8), wherein the devices included in the system are joint by system of central dedusting
(9), which captures dust generated during operation of crushers (5) and (7) and vibrating screens (6) and (8).
