Diaphragms 1

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Grinding MillsOPTIMISATION

Magotteaux / Slegten / Sturtevant

Solutions


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1

2&3

4

5

1Pre-grinding

2Mill division

3Internal equipment4High efficiency

separator

5Mill control system

DIAPHRAGMS


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DIAPHRAGMS


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Definition

Functions

ComponentsFrame

Lifters design

Central screen design

Wear partsMAGOTTEAUX range of diaphragms

DIAPHRAGMS


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Common features to all the

Magotteaux diaphragms

division of the frame in independent sectors fitted on a circular

peripheral steel plate

measured up to 18 mm dyn amic var iat ion o f the diameter

DIAPHRAGMS

Components

Frame


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Deformation

mm

Thickness

mm

50 65 74 5065

3,34,3

6,99,29

diaphragm

CCB

shel l 4400 X 16110 m

Shell length = 16110 mm

DIAPHRAGMS

Components

Frame



division of the frame in independent sectors fitted

on a circular peripheral steel plate


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Mill diam.

in meter

Deformation

D-d in mm

1

1.2

1.4

1.6

1.82

2.2

2.4

2.6

2.8 4

3

3.2

3.4

3.6

3.8 8.14

4.2

4.4 12

4.6

4.8

5.2

5.4 17

5.6

5.8

6

D - d = shell deformation

for sect io n located at

half distance of the two

bear ings versus

m il l diameter

DIAPHRAGMS

ComponentsFrame




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1st cpt.2nd cpt.Result

Sections views from

1st compartment

looking in the

direction of the

outlet

DIAPHRAGMS

ComponentsFrame


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1st solution

DIAPHRAGMS

ComponentsFrame


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1re solution

DIAPHRAGMS

ComponentsFrame


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2nd solution

DIAPHRAGMS

ComponentsFrame


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Lifters Concept

DIAPHRAGMS

Components

Each diaphragm component must be designed in

to allow the diaphragm to fulfill its functions

These chapter is devoted to a detailed study

of each of them:

FrameCentral screen design

Lifters design & Wear parts


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2me solution

DIAPHRAGMS

ComponentsFrame


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DIAPHRAGMS

Components Frame


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DIAPHRAGMS

Components Frame


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DIAPHRAGMS

Components Frame


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DIAPHRAGMS

Components Frame


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DIAPHRAGMS

Components Frame


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DIAPHRAGMS

Components Frame


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2me solution

DIAPHRAGMS

Components Frame


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Lifters Concept

DIAPHRAGMS

Components




of each of them:

Frame Central screen designLifters design& Wear parts


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DIAPHRAGMS


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DIAPHRAGMS


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DIAPHRAGMS


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DIAPHRAGMS


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Lifters Concept

DIAPHRAGMS

Components




of each of them:

FrameCentral screen design

Lifters Design &Wear parts


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HRc HRc

60

50

40

30

Hardness

HRc

20 mm 20 mm

tickness 40 mm

DIAPHRAGMS

Components Wear parts

Rolled steel parts


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Depth in mm

external surface

external surface 33

38

59

60

Gratetickness40

mm

HRc

3mm5mm

7mm

6mm3mm

martensite

perlite

HARDNESS OF ROLLED GRATES

VERSUS DEPTH OF THE

HEAT TREATMENT

DIAPHRAGMS

Components Wear partsRolled steel parts


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Depth in mmexternal surface

external surface

60

Gr

atetickness50m

m

HRc

2mm

2mm

42

Cast alloy parts

CAST GRATES HARDNESS

VERSUS DEPTH OF THEHEAT TREATMENT

DIAPHRAGMS



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DIAPHRAGMS

Components Wear partsCast alloy parts


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DIAPHRAGMS

Components Wear partsCast alloy parts


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Filling rings

DIAPHRAGMS



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DIAPHRAGMS

Magotteaux range of diaphragms

Opticontrol adjustable fabricated steel frame intermediate diaph.

Optimex fabricated steel frame outlet diaphragm

Optidry fabricated steel frame transfer diaphragm

Optidry cast cast steel frame transfer diaphragm

Optiflow fabricated steel frame peripheral discharge diaphragm

Opticast adjustable cast frame intermediate diaphragm

for wet processOpticastex adjustable cast frame outlet diaph. for wet process

Optiwear cast frame intermediate diaphragm for dry process

Airfeel adjustable cast frame intermediate diaphragm fordry process (adjustment from mill ventilation)

MAGOTTEAUX RANGE OF BALL MILL INTERNAL EQUIPMENTDIAPHRAGMS


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DIAPHRAGMS



division of the frame in independent sectors fitted

on a circular peripheral steel plate

independent center part, free to move radially

exceptional wear resistance of the grates and backside plates

permanent evolution of the design to improve the performances

basic design for each of them with small possible adaptations

in view of the particular cases



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DIAPHRAGMS

OPTIMEXfabricated steel frame

outlet diaphragm

Special features :

Maximum opening for the ventilation in the center

Lifters with different lengths

8 mm slots grates


DIAPHRAGMS


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DIAPHRAGMS

cast steel frame transfer diaphragm

Special features :

frame sectors in resilient and high wearresistant cast steel

assembly by bolting only

6 mm slots

exceptional open surface area

for the drying gases

OPTIDRY CAST


DIAPHRAGMS


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fabricated steel frame

peripheral discharge diaphragm

Special features :

retaining dam in the diaphragm

behind the first chamber grates

strong frame design

OPTIFLOW


DIAPHRAGMS


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DIAPHRAGMS

AIRFEEL

adjustable cast frame intermediate

diaphragm for dry process(adjustment from mill ventilation)

Special features :

Adjustment of the material level

in the first chamber by the

ventilation

Frame sectors in resilient and

high wear resistant cast steel

Assembly by bolting only

6 mm slots on the front grates

12 mm slots on the backside

grates

MAGOTTEAUX RANGE OF BALL MILL

INTERNAL EQUIPMENT

DIAPHRAGMS

DIAPHRAGMS


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DIAPHRAGMS

OPTICAST

adjustable cast frame intermediate

diaphragm for wet process

adjustable cast frame outlet

diaphragm for wet process

OPTICASTEX



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Documents

Diaphragms 1