modern coal extraction methods with backfill - los metodos modernos de extraccion de carbon con...
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8/9/2019 MODERN COAL EXTRACTION METHODS WITH BACKFILL - LOS METODOS MODERNOS DE EXTRACCION DE CARBON CON RELLENO
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Jan Palarski
Silesian University of Technology, Gliwice Poland
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Prof. J. Palarski
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UNIT
Hard Coal resources (recoverable resources) (Bt) 40 (4)
Hard Coal Production (Lignite) (Mt) 76,6 (58)
Domestic Consumption (Mt) 70
Waste Production (Mt) 34
Underground Waste Disposal (backfill, grouting of
gob, ... )
- waste rock + tailing + slime(Mt)
4,0
CHARACTERISTICS OF POLISH HARD COALMINING INDUSTRY (2010)
-CCBs 2,7
Volume of Pumped Water and Sewages (Mm3) 189
Total Chloride and Sulphate Loading (Mt) ca 1,5
Production of CCBs (Mt) 13,0
Number of Longwalls - 99
Number of Closed Mines (years 1989- 2009) - 47
Length of Filling and Sealing Workings (km) ca 3700 (years 1993-2009)
Length of Filling Shaft (km) ca 110 (years 1993-2009)
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Mining Methods
Longwall with Backfill
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Longwall with Grouting of Gob
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Methane concentration tendency: gathering in roof cavities and gob and
creation of layer along the roof of working face (airways)
CH4
CH4
ŚCIANA
CH4
CH4
CH4
CH4
CH4
CH4
CH4
70 ÷ 100% CH4
25%
CH450%CH470%CH4
50%CH4
25%CH470%CH4
CH470%CH4
Prof. J. PalarskiSUT Gliwice, Pl
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BACKFILL MIXTURE
MaterialMaterial ++ WaterWater ++ BinderBinderFly AshFly Ash CementCement
SlagSlag Mine waterMine water Fly ashFly ash
SandSand Salt content < 70 g/lSalt content < 70 g/l Blast furnace slagBlast furnace slag
as e rocas e roc n ern er nova,nova,TailingsTailings Ground waste glassGround waste glass
NaturalNatural pozzolanspozzolans
GypsumGypsum
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WASHERYREFUSE SILO
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FILL PLANT - 3000 m3/day
Fly ash discharge and storage
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Surface plant – preparation of mixture
Prof. J. Palarski
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Fly ashFly ashFly ashFly ash
Water Water Water Water
TailingsTailingsTailingsTailings
Cavings areaCavings areaCavings areaCavings area
to be filledto be filledto be filledto be filled
with grout with grout with grout with grout LongwallLongwallLongwallLongwall
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Shaft Shaft Shaft Shaft
Grout transportGrout transportGrout transportGrout transport
pipelinepipelinepipelinepipeline
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FILLING OF WEBER VOID
Sandstone
Void
Pipeline
Shale
Mixture
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Prof. J. Palarski
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