CEMENTANDMININGTECHNOLOGYGMBH

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Our

customers

are

our

success!

01

GRINDING MILLS

MILL TYPES, MILL DESIGN, MILL DIMENSIONS

STANDARD SIZE AND DIMENSIONS *

1,80 x 2,75

2,00 x 3,00

2,20 x 3,25

2,40 x 3,50

2,60 x 4,00

2,80 x 4,25

3,00 x 4,50

3,20 x 4,75

3,40 x 5,25

3,60 x 5,50

3,80 x 5,75

4,00 x 6,00

4,20 x 6,25

4,40 x 6,50

4,60 x 6,75

4,80 x 7,25

5,00 x 7,50

5,20 x 7,75

5,40 x 8,00

5,60 x 8,50

5,80 x 8,75

6,00 x 9,00

90

132

160

250

355

450

630

710

900

1.120

1.400

1.600

1.890

2.200

2.580

3.050

3.815

4.000

4.500

5.300

5.970

6.800

RB

RB

RB

RB

RB

RB

RB

RB

RB

RB

RB

RB

RB

RB

RB

SB

SB

SB

SB

SB

SB

SB

10.000,00

14.800,00

19.500,00

23.500,00

31.780,00

38.970,00

48.220,00

58.200,00

72.970,00

86.050,00

100.600,00

116.700,00

134.400,00

153.800,00

175.030,00

205.156,00

230.757,00

258.395,00

288.145,00

329.788,00

364.720,00

402.025,00

3.670,00

4.785,00

5.670,00

6.300,00

7.760,00

8.830,00

10.120,00

11.440,00

13.380,00

14.890,00

16.475,00

18.100,00

19.850,00

21.670,00

23.570,00

26.234,00

28.300,00

30.390,00

32.650,00

35.870,00

38.310,00

40.550,00

8.230,00

10.735,00

12.780,00

14.125,00

17.410,00

19.800,00

22.700,00

25.650,00

30.015,00

33.395,00

36.950,00

40.600,00

44.512,00

48.600,00

52.870,00

58.840,00

63.490,00

68.170,00

73.220,00

80.450,00

85.930,00

91.000,00

16.770,00

19.265,00

25.220,00

30.875,00

46.950,00

57.700,00

71.300,00

74.350,00

84.985,00

91.605,00

95.050,00

114.400,00

150.490,00

156.400,00

177.130,00

213.900,00

292.400,00

316.900,00

364.950,00

410.280,00

460.900,00

533.050,00

DIMENSIONS ACC. TO SKETCH

3.835

4.120

4.660

4.764

5.265

5.505

6.020

6.270

6.970

7.240

7.470

7.760

8.110

8.560

8.810

10.070

10.370

10.620

11.270

11.770

12.020

12.270

340

355

370

400

410

400

630

735

740

735

735

875

860

780

880

1.200

1.175

1.175

1.075

1.175

1.155

1.325

A {mm} B {mm} C {mm} D {mm} E {mm} F {mm} G {mm}

530

555

585

650

650

670

780

785

900

900

910

920

980

1.080

1.080

1.460

1.495

1.495

1.705

1.715

1.745

1.725

1.360

1.710

1.700

2.050

2.190

2.295

2.440

2.188

2.790

2.880

3.005

3.130

4.050

3.380

3.600

3.950

4.155

4.245

4.300

4.450

4.657

4.800

1.320

1.426

1.538

1.705

1.781

1.838

2.029

5.985

2.298

2.342

2.496

2.661

2.727

2.805

3.112

3.029

3.104

3.205

3.280

3.581

3.658

3.808

3.565

3.740

4.150

4.645

4.880

5.075

5.655

5.985

6.350

6.455

6.925

7.050

7.195

7.385

8.025

8.090

8.445

9.110

9.270

10.060

9.718

6.243

5.230

6.187

6.730

7.250

7.860

8.190

9.220

9.690

10.520

10.860

11.235

11.765

13.020

12.720

13.290

15.220

15.700

16.040

16.645

17.395

17.870

18.395

DIMENSION

Di x EGL

{m}

DRIVE

POWER

{kW}

SUPPORT ** GRINDING

MEDIA WEIGHT

{kg}

WEIGHT

RUBBER LINING

{kg}

WEIGHT

STEEL LINING

{kg}

WEIGHT OF MILL

without lining

{kg}

* Other Ball Mill Dimensions on request!

** RB ... Roller Bearing / SB ... Sliding Bearing

A D

B C

G

EGL

E

F

DI

WORK INDEX CURVES (FEED OR PRODUCT) 80% PASSING

1,0

100,0

100,0 10.000,0

WP = 19,0

10,0

kW

h/t

WF = 2,8

1,0

1,0

100,060 3.000 10.000,0Wi = 30

Wi = 100

Wi = 90

Wi = 80

Wi = 70

Wi = 60

Wi = 50

Wi = 40

Wi = 35

Wi = 3

Wi = 5

Wi = 10

Wi = 15

Wi = 25

Wi = 20

EXAMPLE

Feed Material: Iron Ore

Feed Quantity: 50 t/h

Work Index acc. to Bond: 14,02 kWh/t

Feed Size F80: 3.000 µm

Product Size P80: 60 µm

Dry grinding in closed circuit

Values from table:

WF = 2,8 kWh/t

WP = 19,0 kWh/t

W = WP – WF = 19,0 – 2,8 = 16,2 kWh/t

Ball Mill Power requirement

P = W x Q xEFT

P = 16,2 x 50 x 1,3 = 1053 kW

Therefore a ball mill ø 3,6 x 5,5 m can be

selected.

Material size in microns

GRINDABILITY – HOW TO DETERMINE AND USE IT

The Bond formular permits rapid, accurate power calculation and selection

of the most economically sized machines. The theory was based upon

factual data compiled and correlated from several thousand laboratory

tests and was confirmed in the field from actual operating data.

THE QUANTITY OF SIZE REDUCTION IS PROPORTIONAL TO THEWORK REQUIRED TO ACCOMPLISH THAT REDUCTION.

EACH MATERIAL HAS A DIFINITE WORK INDEX (Wi).

EACH MILL SIZE HAS A DEFINITE RATED POWER.

The Bond formular yields the work required to reduce a material, of known

Wi, from an infinitely large size to the desired product size,

less the work required to reduce the same material to its present feed

size from an infinite size. The result work (W), measured in kWh/t,

indicates the overall energy requirement to reduce the material, of known

Wi, from present feed size to the desired product size.

MILL POWER CAN BE ESTIMATED FROM THE

FOLLOWING BASIC INFORMATION:

1. Material Name.

2. Work Index (kWh/t).

3. Feed size (microns).

4. Product size (microns).

5. Capacity (tons/hour).

6. Is mill feed crushed in open or closed circuit.

7. Is mill feed prescreened or classified to remove

product size material.

8. Type of Mill and type of circuit desired.

W = WP – WF

W = Work in kWh/t

Wi = Work index of material as derived from laboratory

tests or empirical data

P = 80% passing point of product screen analysis in microns

F = 80% passing point of feed screen analysis in microns

P = W x Q x EFT

P = Actual Grinding Power in kW

W = Work in kWh/t

Q = Quantity in metric tons per hour

EFT = Efficiency Factor Total (acc. EF factors below)

EFFICIENCY CORRECTION FACTORS (EF)

EF1 – Dry Grinding .................................... 1,3

EF2 – Open Cercuit ................................... 1, 04 to 1,07 (ø1,2)

EF3 – Diameter Factor ...............................acc. Table

EF4 – Oversize Feed .................................. 1,0 except when Wi

exceeds 14,0 and/or F exceeds 16 mm (rod) or 4 mm (ball) *

EF6 – Reduction Ratio (rod mill) ................1,0 when 20 > Rr < 10 *

EF7 – Reduction Ratio (ball mill) ...............1,0 when Rr > 5,0 *

EF8 – Feed PreparationOpen Cercuit crusher (rod mill only) .............. 1,4

Open Cercuit crusher (rod/ball circuit) .......... 1,2

Closed Cercuit crusher (rod mill only) ........... 1,2

Closed Cercuit crusher (rod/ball circuit) ........1,0

* Note: if outside above limitations or if rod mill (only) feed is scalped, consult

Cemtec GmbH.

WORK INDEX FOR VARIOUS MATERIALS (AVERAGE)

MATERIAL

Bauxite

Cement clinker

Cement raw material

Chrome Ore

Clay

Coal

Coke

Coke, Petroleum

Copper Ore

Diorite

Dolomite

Feldspar

Ferroalloys

Fluorspar

Gold Ore

Granite

Gravel

Gypsum Rock

Iron Ore

Hematite

„Wi” {kWh/t} MATERIAL

Limonite

Magnetite

Taconite

Lead Ore

Lead-Zinc Ore

Limestone

Manganese Ore

Magnesite

Molybdenum Ore

Nickel Ore

Oil Shale

Phosphate Rock

Quarz

Shale

Silicia Sand

Silver Ore

Slag

Tin Ore

Titanium Ore

Uranium Ore

Zink Ore

„Wi”

PRODUCT GRIND EQUIPMENT (TYPICAL MILL SELECTIONS)

TYPE OF GRIND PRODUCT TYPE OF MILL

Very Coarse

Coarse

Medium

Fine

Very Fine

4 - 810 - 2035 - 200

100 - 325

-325

4.750 - 2.3601.700 - 850

425 - 75150 - 45

-45

Peripheral Disch. Rod

Overflow Rod (wet)

Diaphragm Ball

Overflow Ball

(Diaphr. Ball for Single-

Stage or Dry Grind)

See „fine” above

DIAMETER

0,80,91,01,11,21,31,41,51,61,71,81,92,02,12,22,32,42,52,62,72,82,93,03,23,43,63,84,04,24,44,64,8

EF3

1,2501,2211,1951,1731,1531,1341,1181,1021,0881,0751,0631,0511,0411,0301,0211,0121,0030,9950,9870,9800,9730,9660,9600,9470,9360,9250,9140,9140,9140,9140,9140,914

MESH MICRONS

13,8814,7711,7810,58

7,8314,4523,6658,3814,7021,3815,5612,4816,4913,4516,2014,8417,45

8,9914,0212,82

10,0713,7818,3112,7113,7312,2714,2116,2812,8614,6637,9214,8915,8212,0123,4218,8818,2513,6112,4615,4412,87

CEMENTAND

MININGTECHNOLOGY

GMBH

CEMTEC Cement and Mining Technology GmbH

Stadlgasse 8a, A-4470 Enns, Austria

Tel: +43/7223/83620, Fax: +43/7223/85083

email: info@cemtec.at, http://www.cemtec.at

www.cemtec.at>