03 Ball Mill EDM

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Grinding with Ball Mill Systems

EDM

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Ball Mill

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What is a

What is a End Discharge Mill (EDM)?

End Discharge Mill (EDM)?

Intermediate diaphragm

Mill feed arrangement

1

sstt

_Compartment

(Coarse Grinding)

2

sstt

_Compartment

(Fine Grinding)

Mill discharge

Air outlet

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EDM

EDM =

E

nd

nd D

D

ischarge M

ischarge

M

ill

Product discharge

at mill

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Elements of Ball Mill -

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Mill Drive Concepts

SS ii nn gg ll e e pp ii nn ii (( < < 22 '' 55 00 0 0 kk DD oo uu bb ll ee -- pp ii nn (( < < 55 '' 00 00 0 0 kk GG ii rr tt h h gg ee aa r r SS ii nn gg ll e e dd rr ii tt ww o o pp ii nn ii oo (( < < 55 '' 00 00 0 0 kk DD oo uu bb ll ee d d rr ii ff oo uu r r pp ii nn ii (( < < 11 00 '' 00 00 00 GG ii rr tt h h gg e ae a T w T w oo -- ww aa yy pp oo rr ee dd uu cc ee rr (( < < 66 '' 00 00 0 0 kk PP ll aa nn e te t aa rr y y gg (( < < 11 22 '' 00 00 00 CC ee nn tt rr aa l l dd DD rr ii v e Cv e C oo nn BB aa ll l l mm ii ll ll

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Example Planetary Gear Drive

Planetary gear reducer concept MAAG

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 Two gear stages with three planetsTwo gear stages with three planets

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 All shafts with friction bearingsAll shafts with friction bearings



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Gear Box Internals

Parallel shaft gear reducer (two way

Parallel shaft gear reducer (two way power branch)

power branch)

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 All gears surface-hardened andAll gears surface-hardened and ground

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Potential Technical Problems Drive

Girth gear drives - Fundamental

Problems

1.1. Axial/radial runoutAxial/radial runout

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2. Alignment of the drive trainsAlignment of the drive trains 3.

3. Uneven power splittingUneven power splitting

5

5 22 5

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Gearboxes

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Potential Damages Drives

Breakage damage (pinions)



Cause: Inadequate transverse load

distribution, brittle material

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Ball filling degree (f)

[[%% ]]

85

93

98

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Steps of Grinding

Coarse

Grinding

Medium

Grinding

Fine

Grinding

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Coarse Grinding: Parameters for

Coarse Grinding: Parameters for Optimising

Optimising

Power parameters

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Grinding Media

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Grinding Media (1

sstt

_Compartment)

1.Compartment

Ø

Ø BBaalll l [[mmmm]] WWeeiigghht t [ [ t t ]] PPeerrcceennt t [[%%]]

90 90 25.025.0 25.025.0 80 80 35.035.0 35.035.0 70 70 25.025.0 25.025.0 60 60 15.015.0 15.015.0 Total Total 100.0100.0 100100 A

Avveerraaggeebbaallllwweeiigghhtt [[gg]] 11666677 S

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Grinding Media (2

nndd

_Compartment)



_{Holcim Standard for OPC > 3’200 [cm2/g], closed circuit}

system

2.Compartment

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Material Quality of

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Specific Wear Rates of Grinding Media

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Mill Efficiency

[%R]

acc.

[cm

22

_/g]

Blaine

Blaine Value

Chamber 1 Chamber 1

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Lifting Liners Effects

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