Ball Mill Presentation

Ball Mill Group No. 3

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Contents

Introduction Types and Process Principle of 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 Process 2. Dry 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

A

Inlet

Drive

B C Outlet

D Mill Internals

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A. Inlet


INLET TUBE mostly for wet mills
INLET CHUTE 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- CENTRAL

2- GEAR RIM/PINION

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Types of drives


CENTRAL DRIVE
GEAR RIM / PINION with one pinion or double pinion

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C. Outlet


OVERFLOW 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- OVERFLOW

2- DISCHARGE DIAP.

3- CENTRAL

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D. Mill Internals


STEEL LINING for wet and dry mills
RUBBER LINING 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

Bolted version

Semi-bolted version

Boltless version

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ERECTION of COMPACT LINING

Design IMPORTANT DATA TO DESIGN A Ball MILL Feed material:

Environment:

Temperature [°C]: Grain size [80% < x µm]: Work Index acc. Bond [kWh/t]: Feed quantity [kg/h]:

Altitude [m a.s.l.] Ambient temperature [°C]

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

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

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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 (where k ranges from 0.9 to 1.4)
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 2007=533.1 Cost index 1990=357.6

Ball Mill Group No.3

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