USE OF MILL TESTS FOR MILLING OPTIMIZATION

HAROLD S. BIRKETT

MILL TEST METHOD

• COLLECT CANE GOING INTO MILL

• COLLECT BAGASSE OUT OF EACH MILL

• ANALYZE SAMPLES FOR:

– MOISTURE (DRY)

– POL (BLENDER)

– FIBER (BLENDER, WASH, DRY)

MILL TEST METHOD

• PLOT MOISTURE CURVE

• CALCULATE POL EXTRACTION AS:

POL % FIBER INTO MILL – POL % FIBER OUT MILL X 100 POL % FIBER INTO MILL

BRIX CURVE

02

468

10

121416

1820

1 2 3 4 5 6

MILL NUMBER

BR

IX %

JU

ICE

.

BACK FRONT

MOISTURE CURVE

50

55

60

65

70

75

1 2 3 4 5 6

MILL NUMBER

MO

IST

UR

E %

BA

GA

SS

E .

EXTRACTION CURVE

0

10

20

30

40

50

60

1 2 3 4 5 6

MILL NUMBER

PO

L E

XT

RA

CT

ION

, %

.

02

46

81012

1416

1820

1 2 3 4 5 6

MILL NUMBER

BR

IX %

JU

ICE

.

BACK FRONT

50

55

60

65

70

75

1 2 3 4 5 6

MILL NUMBER

MO

ISTU

RE %

BAG

ASSE

.

0

10

20

30

40

50

60

1 2 3 4 5 6

MILL NUMBER

POL

EXTR

ACT

ION,

%

.

BRIX CURVE

0

24

68

10

1214

1618

20

1 2 3 4 5 6

MILL NUMBER

BR

IX %

JU

ICE

.

BACK FRONT

MOISTURE CURVE

50

55

60

65

70

75

1 2 3 4 5 6

MILL NUMBER

MO

IST

UR

E %

BA

GA

SS

E .

EXTRACTION CURVE

0

10

20

30

40

50

60

1 2 3 4 5 6

MILL NUMBER

EX

TR

AC

TIO

N, %

.

0

24

68

10

1214

1618

20

1 2 3 4 5 6

MILL NUMBER

BR

IX %

JU

ICE

.

BACK FRONT

50

55

60

65

70

75

1 2 3 4 5 6

MILL NUMBER

MO

ISTU

RE

% B

AG

AS

SE

.

0

10

20

30

40

50

60

1 2 3 4 5 6

MILL NUMBER

EX

TRA

CTI

ON

, %

.

BRIX CURVE

02

46

81012

1416

1820

1 2 3 4 5

MILL NUMBER

BR

IX %

JU

ICE

.

BACK FRONT

MOISTURE CURVE

50

55

60

65

70

75

1 2 3 4 5

MILL NUMBER

MO

IST

UR

E %

BA

GA

SS

E .

EXTRACTION CURVE

0

10

20

30

40

50

60

1 2 3 4 5

MILL NUMBER

PO

L E

XT

RA

CT

ION

, %

.

02

46

81012

1416

1820

1 2 3 4 5

MILL NUMBER

BR

IX %

JU

ICE

.

BACK FRONT

50

55

60

65

70

75

1 2 3 4 5

MILL NUMBER

MO

ISTU

RE

% B

AG

AS

SE

.

0

10

20

30

40

50

60

1 2 3 4 5

MILL NUMBER

POL

EXTR

AC

TIO

N, %

.