Ball Mill Presentation

Ball Mill  Group No. 3

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Contents

Introduction Types and Process Pr nc p e o work   Description of Ball mill Design and Cost

 Introduction

 It

is a device used for size reduction, It can reduce sizes up to a tenth of a micron.  Cylindrical in shape.  Rotates on a horizontal axis.  Partially filled with the material to be ground and the grinding medium.

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Types and Process

Types and process

There are two Processes

There are two Types

1. Wet Pr Process 2. Dry Pr Process

1. Continuous 2. Batch

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Principle of ball mill 

 The

rpm of mill  The difference in speed between balls

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Description

Inlet

A B C Outlet

D Mill Internals

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 A. Inlet 

 INLET

TUBE mostly for wet mills

with fresh air flap for mill ventilation  INLET

SCREW for problematic feed materials Ball Mill Group No.3

Types of inlet 

1- TUBE

2- CHUTE

B.3- SCREW

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B. Drivers

1- CE CENTRAL

2- GE GEAR RIM/PINION

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Types of drives

 CENTRAL

DRIVE

with one pinion or double pinion

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C. Outlet 

 OVERFLO OVERFLOW W

MILLS WITH/WITHOUT SCREEN CAGE for wet mills

 DISCHARGE

DIAPHRAGM

for wet and dry mill

 CENTRAL

DISCHARGE

for dry mills

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Types of Outlet 

1- OVE VERF RFL LOW

2- DISCHARGE DIAP.

3- CENTRAL

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D. Mill Internals

 STEEL

LINING for wet and dry mills

for wet mills 

CERAMIC LINING for iron-free grinding Ball Mill Group No.3

Types of Mill Internals

STEEL

RUBBER

CERAMIC

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Fastening systems

Semi-bolted version

Boltless version

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ERECTION of COMPACT LINING

Design IMPORTANT DATA TO DESIGN A Ball MILL Feed material:

Environment:

Tempera Temp erature ture [°C]:

Altitude [m a.s.l.] °

Work Index acc. Bond [kWh/t]: Feed quantity [kg/h]:

Process: Dry / wet grinding Open / closed circuit Grinding media

Product: max. temperature [°C]: Grain size [80% < x µm]: µ m]:

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Calculation Feed capacity → Mill dimensions  Filling ratio (30-45%), Mill dimensions → Bulk volume of the balls  ball size : D2 = k * Dp . .  Speed of the shell Ncritical = (30*f)/ √(R-r), where f =0.65-0.75  Mass of balls = Bulk volume * Bulk density 

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Cost 

Cost Ball mills, Ball charge are $315 S/ton Ball Mill Group No.3

Cost Ball mills dry grinding

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Cost Ball mills for wet grinding

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To get the price of the ball mill  for 2007   Cost

2007 =(Cost 1990)*(Cost index 2007)/(cost index 1990)

. Cost index 1990=357.6

Ball Mill Group No.3

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