composite washing of coals from multiple sources optimization case study
DESCRIPTION
Composite Washing of Coals from Multiple Sources Optimization case study. CASE STUDY. Raw Coals. 9 coals with different washability potential From seam III to seam VIII Raw coals were crushed to 75 mm Only one coal was crushed to 13 mm Separated into 2 sizes (75-6 & 6-0.5 mm). Aim. - PowerPoint PPT PresentationTRANSCRIPT
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Composite WashingComposite Washingof Coals fromof Coals from
Multiple SourcesMultiple Sources
OptimizationOptimizationcase studycase study
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CASE STUDYCASE STUDY
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9 coals with different washability potential
From seam III to seam VIII
Raw coals were crushed to 75 mm
Only one coal was crushed to 13 mm
Separated into 2 sizes (75-6 & 6-0.5 mm)
Raw Coals
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AimTo beneficiate optimally
at an ash level of
16.5 to 17.5 %
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Raw coal characteristics
Raw Coal Ash % Raw Coal Ash %
A 28.4 F 28.8
B 16.0* G 30.8
C 23.6 H 35.4
D 24.3 I 35.3
E 27.5
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Circuit “I” Each separately crushed & screened
Coarser 75-6 mm fraction
Smaller 6-0.5 mm fraction
Beneficiate each fractions to 17 % ash
Composite yield - Blended cleans
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Circuit “II”
Blending of raw coals
Crushed & screened to,
Coarser 75-6 mm fraction
Smaller 6-0.5 mm fraction
Beneficiate both fractions to 17 % ash
Composite yield - Blended cleans
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Results
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Composite Washing of individual coals
Optimum sp. gr. ofcut
Elementary ash (%)at cut point
Optimum Cleans (%) Desired compositeclean (%)
75-6 mm 6-0.5mm
Coal
75-6mm
6-0.5mm 75-6 mm 6-0.5mm
Yield Ash Yield Ash Yield Ash
A 1.461 1.484 24.1 24.0 37.8 18.1 61.5 10.6 40.1 17.0
B 1.592 1.597 30.7 30.7 95.1 16.0 92.9 7.8 94.8 15.0#
C 1.621 1.622 35.9 35.9 88.0 18.9 84.1 9.3 87.2 17.0
D 1.612 1.610 33.3 33.2 78.3 17.8 90.9 12.1 79.8 17.0
E 1.483 1.498 24.6 24.6 50.9 18.1 69.3 9.4 52.7 17.0
F - 1.516 - 27.0 - - 49.5 17.0 49.5 17.0*
G 1.422 1.474 22.0 22.1 15.0 19.7 45.6 8.8 18.0 17.0
H 1.428 1.464 21.5 21.5 17.5 18.3 53.1 10.8 19.9 17.0
I 1.454 1.478 23.5 23.5 20.7 18.8 44.5 10.6 23.4 17.0
Average 1.509 1.527 27.0 27.0 50.4 18.2 65.7 10.7 51.7 16.8# Raw coal ash 16.0%* Coal crushed to 13mm and washed with smaller fraction
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Global Optimization of Mixed coals
Optimum sp. gr. ofcut
Elementary ash (%)at cut point
Optimum Cleans (%) Desired compositeclean (%)
75-6 mm 6-0.5mm
Coal
75-6 mm 6-0.5mm 75-6 mm 6-0.5mm
Yield Ash Yield Ash Yield Ash
Average 1.500 1.516 26.4 26.4 54.3 18.3 59.8 12.8 55.5 17.0
A 27.3 26.9 49.0 19.5 67.2 11.7 50.8 18.5
B 24.4 24.2 81.1 14.3 88.3 7.1 82.0 13.3
C 26.3 26.1 73.1 16.9 78.8 7.7 74.3 15.0
D 24.1 25.6 61.9 15.0 82.1 10.8 64.3 14.3
E 26.2 26.2 55.6 18.5 71.4 9.8 57.2 17.4
F 27.0 49.4 16.9 49.4 16.9
G 28.5 25.6 46.0 24.6 54.6 11.4 46.9 23.1
H 27.9 26.5 39.6 21.6 62.2 12.7 41.1 20.7
I 27.6 27.0 31.2 21.4 49.9 12.3 33.3 19.8