cpb liners presentation

3-days Training Course September 26 - 28, 2011

Christian Pfeiffer Maschinenfabrik GmbH 2 Mill shell liners September 26 - 28, 2011

Mill shell liners September 26 - 28, 2011

Mill Shell Linings presented by Mike Kleinebecker

o Mill shell lining

o Lining system 1st compartment

o Lining system 2nd compartment

o Experience

o Fastening types

o Head lining

o Materials


Mill shell lining

o Mill shell lining



o Experience

o Fastening types

o Head lining

o Materials


Mill shell lining

Data of influence

Mill data Feed material

Type of mill Clinker, Coal, Raw materials

Diameter Additives

Compartment length Grindability

Critical speed Feed size

Sense of rotation Product fineness

Circuit


Mill shell lining

Data of influence

Mill operation Lining data

Feeding system Actual liner design

Circuit control and operation Fastening method

Ball charge Bore hole size and pattern

Existing mill internals Size of plates

Reason of replacement


Mill shell lining

Function of mill shell lining Accelerate/lift/activate the ball charge

Coarse grinding = cataracting

Fine grinding = cascading acting


Mill shell lining

Grinding media movement A. In circumferential direction

1. Constant speed 2. Constant acceleration


Mill shell lining

Grinding media movement A. In circumferential direction

3. Decreasing acceleration 4. Increasing acceleration


Mill shell lining

Grinding media movement B. In axial direction

1. No axial movement 2. Classifying effect


Lining System 1st compartment

o Mill shell lining



o Experience

o Fastening types

o Head lining

o Materials



Activator lining system 1st compartment

Design

o Lining especially designed for coarse grinding

o Influencing factors: activator height (H) an inrun radius (R)

o Predetermining lifetime factors: plate thickness (D) and

activator width (B)

o Bolted and boltless version possible, preferably dimensions

250 x 314 mm (DIN standard)



Activator lining system 1st compartment

Optimum lifting over the entire lifetime

Constant lifting height (H) at reduced lifting width (B)


Lining system 2nd compartment

o Mill shell lining



o Experience

o Fastening types

o Head lining

o Materials


Lining system 2nd compartment

Classifying lining system 2nd compartment

Design

o Lining designed for fine

grinding

o Movements:

A) activation

B) classification

o Different activator

designs:

One hub per plate for larger grinding balls

Multi step plate for smaller grinding balls


Experience

o Mill shell lining



o Experience

o Fastening types

o Head lining

o Materials


Experience

Grinding Factor (GF)

94%

Conventional step liner

100%

Progressive lifter type Activator


Experience

Experience

Activator lining system Step-lining system

Progressive activation Linear activation


Experience

Experience




Experience

Liner designs for coarse grinding (1st comp.)

o (A) Progressive lifter type Activator

o (B) Conventional step liner

o (C) Wave liner type Duolift

o (D) Step liner type X-Lift

o (E) Step liner with wave profile


Experience

Coarse grinding (A) Progressive lifter type Activator

GF* (A) 100%

(over the lifetime)

* GF = Grinding factor

(A) Progressive lifter type Activator

(B) Conventional step liner

(C) Wave liner type Duolift

(D) Step liner type X-Lift

(E) Step liner with wave profile


Experience

Coarse grinding (B) Conventional stepliner

GF* (B) < GF* (A) ~ 6%








Experience

Coarse grinding (C) Wave liner type Duolift

GF* (C) < GF* (A) ~ 6-8%








Experience

Coarse grinding (D) Stepliner type X-lift

GF* (D) < GF* (A) ~ 10-12%








Experience

Coarse grinding (E) Stepliner with wave profile

GF* (E) < GF* (A) ~ 10-12%








Experience

Fine grinding Classifying lining with activator profile


Experience

Fine grinding Conventional classifying lining with wave profile


Experience

Fine grinding Wave lining type Dragpeb (without classifying effect)


Experience

Fine grinding CPB Classifying spiral lining (CSL-Lining)


Fastening types

o Mill shell lining



o Experience

o Fastening types

o Head lining

o Materials


Fastening types

Bolted

o Requires a drilling in the

mill tube for every plate

o Easy handling during

installation and

maintenance


Fastening types

Semi-bolted

o Minimum two bolted

rows in total

o Requires special tools

an experienced fitters


Fastening types

Boltless

o Plates are forced-fitted

with positive locking

without any bolts

o Requires precise

preparation, special

tools and very

experienced fitters


Head lining

o Mill shell lining



o Experience

o Fastening types

o Head lining

o Materials


Head lining

Head lining Concept

o Main function: protection of mill head against wear

o Division of the wear plates into ring segments

o Adjustment of plate thickness to the wear conditions and the

targeted lifetime


Head lining

Conical design

Conical head lining plates on

a conical mill head are

exposed to the high impact

of the grinding media.

Result: high risk of breakage

of head lining plates


Head lining

Straight design (with structure)

Straight head lining plates

on a conical mill head

(realized by a structure) are

protected from high impact

of the grinding media.

Result: reduced risk of

breakage of head lining

plates


Materials

o Mill shell lining



o Experience

o Fastening types

o Standardisation

o Head lining

o Materials


Materials

Materials

5 % Cr 0.5 % C 48-53 HRC


Any questions? Feel free to ask!

Thank you for your kind attention.

cpb liners presentation

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