ADVANCES IN EUCALYPTUS PULP BLEACHING TECHNOLOGY 3rd ICEP March 4-7, 2007

Belo Horizonte Olavi Pikka, Andritz Oy

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master) Advances in Eucalyptus pulp bleaching technology Introduction

Bleaching process development Recent topics in pulp bleaching technology Oxygen delignification Pulp washing Hexenuronic acid removal Modern bleaching sequences Pulp quality Power, steam, effluent

Recent mill results Future topics and conclusion Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 2 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Introduction Use of eucalyptus pulp has increased rapidly Production capacity increase in the southern hemisphere Fast-wood plantations Uniform quality Mill capacities growing

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 3 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Titleof(fill in slide master)Chemical Pulp WORLD Consumption Bleached Eucalyptus

Million ton Consumption

Market

Integrated

30 25

20 15 10 5

Source: JP World Fiber Outlook 2006 + cop Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 4 / © Andritz. Oy 2006

2020

2015

2010

2005

2000

1995

1990

1985

1980

0

4000 3000 2000 1000 0

1970

1980

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 6 / © Andritz. Oy 2006

1990

2010 2000 Year

Capacity, ADT/D

Advances in eucalyptus pulp bleaching technology Presentation Title (fillofin slide Development pulp millmaster) capacity

Advances in eucalyptus pulp bleaching technology Specific Investment Presentation Title (fill Requirements in slide master) Investment costs for new capacity continue to grow but so does the size. New hardwood pulp mill projects have a capacity as high as one million tons. Investment cost/ton continues to drop, but increasingly slowly.

Reduce fragmentation of industry and increase unit size. Adapt new technologies to reduce the operational costs (up-time, wood, chemicals, energy, maintenance, environment)

Source: JP World Fiber Outlook 2006 Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 7 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Bleaching Title process Presentation (filldevelopment in slide master) From elemental chlorine to chlorine dioxide Less bleaching stages Oxygen delignification Oxygen and peroxide reinforced pulp bleaching

Medium consistency pumping Equipment technique High shear mixing Pulp washers ECF, Light-ECF, TCF bleaching New bleaching chemicals Ozone, Paa, PMo

Reduced effluent discharges Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 8 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology 50 Presentation Title (fill in slide master)

Bleaching process development

40 30 20

10 1970 1980

1990 2000

60 50 40

30 20

Year

2010 AOX in bleach effluent, kg/admt

Total active chlorine consumption, kg/admt

Year

1980

1990

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 9 / © Andritz. Oy 2006

2000

4 3 2 1

1980

1990

2000

Advances in eucalyptus pulp bleaching technology Presentation Titleprocess (fill in slide master) Bleaching development O/O-A/D-EOP O/O-A/D-EOP-D-P O/O-DHot-EOP-DND O/O-A/D-EOP-DND O/O-Z/D-EOP-D O/O-D-EOP-DND O/O-A/D-EOP-D O/O-D-EOP-D(-D)

O/O-DHot-EOP-D

O/O-D-EO-D-D O-C/D-EO-D-D O-C/D-E-D-E-D

C/D-E-H C-E-H-D-E-D

1995 TCF

O/O-Q-Z-Q-Z-P O/O-Q-Z-Q-P O/O-A-Z-P-Z-P O/O-Z/Q-P-Z/Q-P O/O-Q-P-Q-P O/O-Q-PAA-Q-P

C-E-H-H

1970 Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 10 / © Andritz. Oy 2006

1980

1990

2000

2010

Advances in eucalyptus pulp bleaching technology Presentation Titleprocess (fill in slide master) Bleaching development Drum Displacer (DD) bleaching Wash Press bleaching

Displacement bleaching Ozone bleaching

Diffuser bleaching Oxygen delignification Medium consistency technology Medium consistency pump & equipment

Drum washer bleach plant

Year

1970

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 11 / © Andritz. Oy 2006

1980

1990

2000

2010

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Bleaching process development C

E

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 12 / © Andritz. Oy 2006

H

D

E

D

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master) Bleaching process development Diffuser bleaching

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 13 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide Displacement master) bleaching

Bleaching process development

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 14 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Bleaching development Presentation Titleprocess (fill in slide master) High density stock pump • capacity 4000 admt/d

• head up to 200 m • consistency 10…12% Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 15 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Titleprocess (fill in slide master) Bleaching development Chemical mixer • capacity 4000 admt/d • consistency 10…13%

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 16 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Topics in pulp bleaching technology Oxygen delignification Removal of Hexenuronic acid Bleaching sequences Pulp washing Pulp quality

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 17 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Oxygen delignification Single-stage system Two-stage system Process parameters Temperature profile Chemical profile Pressure profile

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 18 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Single-stage oxygen delignification

Two-stage oxygen delignification

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 19 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Two-stage versus single-stage oxygen delignification Enables better process parameter controls retention time, pressure, chemical, temperature

Enables better potential for kappa reduction, selectivity, brightness 1-2 units higher kappa reduction 5 - 10 units higher brightness Pulp washing before oxygen delignification in a key role there is peroxide formation in oxygen reactions and black liquor catalyzes the degradation of peroxide COD carryover less than 90 kg/adt

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 20 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Removal of hexenuronic acid

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 21 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

HexA contents in different pulps  Scandinavian

softwood pulps 20 – 30 mmol/kg

 Scandinavian birch pulp 40 – 60 mmol/kg  Eucalyptus pulp 45 – 85 mmol/kg  Acacia and mixed hardwood pulps 35 – 50 mmol/kg 10 – 12 mmol HexA /kg corresponds to 1 kappa unit

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 22 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master) Relation between HexA and residual lignin of the hardwood and softwood pulp kappa number Softwood

Hardwood 20

20 Residual lignin

10

Kappa number

Kappa number

30

15

In eucalyptus pulp 30…50% of kappa can originate from Residual lignin HexA

10

5 HexA ^ = “False” lignin HexA ^ = “False” lignin Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 23 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

 HexA consumes bleaching

chemicals (O3, ClO2, and PAA)  HexA does not react with O2 and H2O2

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 24 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master) Oxygen Delignification, Hardwood

• Delignification degree 60…65 % • Kappa reduction 40…50 % Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 25 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master) A-Stage - typical process conditions HexA content

40-80 mmol/kg 20-30 mmol/kg

HW SW

3 – 3,5 medium; 10-12% 10-15 kg/adt 90 - 100°C 2-4h  60-80% HexA decrease 3 - 5 kappa units, hardwood 1 - 3 kappa units, softwood Decrease in pulp metal content pH pulp consistency COD carryover temperature time

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 26 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology A-stage alternatives Presentation Title (fill in slide master) A-stage in storage tower

A-stage in separate up-flow tower

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 27 / © Andritz. Oy 2006

HexA (meq/kg)

Advances in eucalyptus pulp bleaching technology Development of HexA as a function of time (pH = 3.5) 80 Presentation Title (fill in slide master) T = 85 C T = 90 C T = 95 C

70 60 50 40 30 20 10 0 0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

Time (h) Development of HexA as a function of time (pH = 3.0)

80

/1/, /2/ Vuorinen, T., Buchert, J., Teleman, A., Tenkanen, M. & Fagerström, P

HexA (meq/kg)

70

T = 95 C T = 90 C T = 85 C

60 50 40 30 20 10 0

Fiberline Division

0

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 28 / © Andritz. Oy 2006

0.5

1

1.5

2

2.5 Time (h)

3

3.5

4

4.5

5

Advances in eucalyptus pulp bleaching technology Presentation Titleeuca, (fillHexA in slide master) South-American content 54 mmol/kg A-stage kappa vs. time, 90 °C pH 3.4

11 10.1

kappa number

10 9

8

7.6

7

6.5

6

5.4

5

4.2

4 0

60

120

180

240

Time, min Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 29 / © Andritz. Oy 2006

300

360

420

Advances in eucalyptus pulp bleaching technology Presentation (fillofin slide master) Competing Title removal HexA and lignin Relative HexA content (%)

100 Paa-stage

80

Z-stage D-stage

60 40 20

0

20 40 60 80 Relative lignin content (%)

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 30 / © Andritz. Oy 2006

100

/1/ Vuorinen, T., Buchert, J., Teleman, A., Tenkanen, M. & Fagerström, P

Advances in eucalyptus pulp bleaching technology Reaction of Title 2-furoic acid Presentation (fill in with slideClO master) 2 and HOCl/Cl2 (T=90ºC, pH=2)

Fiberline Division 3rd IEPC Belo Horizonte

/3/ Toikka, K et al 4-7 March 2007 OP

presentation title.ppt / 19 October 2006 / Slide no. 31 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Combining Hexa removal to bleaching Modern bleaching sequences

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 32 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master) A / D oW

DHotW

A / ZW AW – ZW

Z / DW

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 33 / © Andritz. Oy 2006

AW – Z / DW

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master) Effect of interstage washing on the performance of the selective hydrolysis of HexA in chlorine dioxide bleaching of birch kraft pulp

Pulp 1 Pulp 2 Pulp 3

A-D-E-D Kappa Bright. A-D-E ISO% 2.4 86.1 2.7 84.5 2.0 88.6

A/D-E-D Kappa Bright. A/D-E ISO% 2.0 86.8 2.8 84.2 2.3 88.0

/1/ Vuorinen, T., Buchert, J., Teleman, A., Tenkanen, M. & Fagerström, P Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 34 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master) Effect of interstage washing on the performance of the selective hydrolysis of HexA in ozone bleaching of birch kraft pulp

O-A O-A-Z O-A/Z

Kappa number 4.1 1.8 3.7

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 35 / © Andritz. Oy 2006

Brightness ISO% 53.6 72.1 56.2

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

A stage combined with D0 stage

ClO2 (act Cl) kg/admt

HW, Kappa 11.5, 33.2 kg/bdmt (act Cl), T=63°C, residuals kg/admt 35.0

30.0 25.0 20.0 15.0 10.0 5.0 0.0 0

5

10 Time after mixing, min

Fiberline Division 3rd IEPC Belo Horizonte

4-7 March 2007 OP

presentation title.ppt / 19 October 2006 / Slide no. 36 / © Andritz. Oy 2006

15

20

25

Advances in eucalyptus pulp bleaching technology Relative benefits (+/-)Title of different bleaching sequences with respect Presentation (fill in slide master) to each other Capital cost

Chemical cost

Brightness flexibility

Brightness reversion

Effluent

Z/D-Eop-D-P

---

++

+++

+++

+++

A-Z/D-Eop-D

---

+++

+++

++

+++

A/D-Eop-D-P

-

+++

+++

+++

++

A/D-Eop-Dn-D

--

++

++

++

++

A/D-Eop-DnD

0

0

0

0

0

A/D-Eop-D

+

-

0

-

-

Z/D-Eop-DnD

0

-

+

+

+

A/D-Eop-D/P

+

0

0

+

+

Z/D-Eop-D/P

+

0

0

+

++

Sequence

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 37 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Effect of pulp washing

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 38 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title and (fillD100 in slide Effect of post O2 carryover recyclemaster) to D100 stage on D100-Eop kappa number and brightness. The letters PO stand for post oxygen Effect of post O2 carryover and D100 recycle to D 100 stage on D100 EOP kappa number and brightness 60

5 Eop E kappanumber number OP kappa

EOP Brightness % ISO

56

4,5

Eop E Brightness,% %ISO ISO OP Brightness,

55

4 53

3,5 51

50

3

EOP kappa number

56,8

2,5 45

2 clean

PO

D100

PO+D100

Type of Carryover Added to D100 Pulp: Southern Pine, PO kappa 18 D 100 recycle 8.5 kg/t COD, PO carryover 10 kg/t COD, 18.5 kg/t COD total Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 39 / © Andritz. Oy 2006

/4/ Miller, W. J. & Lennon, V. E

Kappa-number increase

Advances in eucalyptus pulp bleaching technology Kappa-number increase(fill after E-stage Presentation Title in slide master) 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0

Effect of COD originating from different sources on brightness decrease and kappa increase after the E-stage 0

1

2

3

4

5

6

7

8

9

10

kgCOD/bdt into the D0-stage

COD caused by lignin from cooking COD caused by lignin from oxygen delignification COD caused by lignin from D0-stage

/5/ Viirimaa, M., Dahl, O., Niinimäki, J., Ala-Kaila, K. and Perämäki, P

ISO-brightness (%) decrease

ISO-Brightness (%) decrease after E-stage 3.5 3 2.5 2 1.5 1 0.5 0

0 0

1

2

3

4

5

6

7

kgCOD/bdt into the D -stage Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 40 / © Andritz. Oy 2006

8

9

10

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Laboratory bleaching trial dilution with clean water and circulating filtrate in Do-stage. Bleaching sequence D0-EP-D1-D2. SWSA, kappa 13.1. ClO2 charge in D0 3.8% and in D1 1.5%. Increase in the chemical consumption, when diluting with filtrates

Brightness, % ISO

88 86 84

82 80

78 76

D-EP-D Dilution with water D-EP-D Dilution with circulated filtrates D-EP-D-D Dilution with circulated filtrates

74 72

52

54

56

58

60

62

Total ClO2 charge, kg act.Cl/bdt Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 41 / © Andritz. Oy 2006

/6/ Alastalo, J., Vehmaa, J., Pikka, O

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in fractional slide master) 3-stage bleach plant with and non-fractional washing at normal and reduced effluent discharge A/D0

Eop

D1

Total COD in pulp kg/adt 3

Bleach Plant Effluent 15 m /adt 3 Bleach Plant Effluent 10.8 m /adt Segregated washing Non-segregated washing Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 42 / © Andritz. Oy 2006

A/D O 5

Eop 8.9

D1 5

DM 1.9

5 17.9

22.8 16.6

14.5 11.5

3.6 5.4

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Pulp quality

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 43 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Fiber deformation/Fiber damage

Caused by chemical and mechanical treatment at high alkali concentration at high temperature brown stock/oxygen delignification areas most critical

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 44 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Fiber curl

Fiber kink

Dislocation

Fiber Twist

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 45 / © Andritz. Oy 2006

Microcompression

Fiber wall collapse /11/ Rauvanto, I., Henricson, K.,

Delta Brightness, %

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master) The effect of HexA in brightness reversion in laboratory-bleached eucalyptus pulps 7 6 5 4 3 2 1

0 0

5

10

15

HexA, meq/kg

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 46 / © Andritz. Oy 2006

20

25

Advances in eucalyptus pulp bleaching technology Presentation (fill PC in slide master) CorrelationTitle between and carbonyl content after 48 h of ageing at 80°C and 65% relative humidity 16

oxidized kraft pulp oxidized kraft pulp (xylan reduced)

PC, 48h ageing

14 12 10 8 6

4 /7/ Adorjan, I.,1 Zhou, Z.,1 Jääskeläinen, AS.,1 Potthast, A.,2 Vuorinen, T., 1

2

0 0

10

Fiberline Division

20

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 47 / © Andritz. Oy 2006

30

40

50

60

CO content, m mol/g

70

80

90

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

OX in pulp in different bleaching sequences

/8/ Martikka, M Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 49 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title treatment (fill in slide master) A modern effluent system

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 50 / © Andritz. Oy 2006

Reductions: COD BOD5

70-75% 95%

AOX 50-60% Color 60-70%

Advances in eucalyptus pulp bleaching technology Presentation Title (fill in slide master)

Recent mill results

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 51 / © Andritz. Oy 2006

Advances in eucalyptus pulp bleaching technology Presentation Title (fill slide master) Veracel Fiberline 3000inADMT/D Cooking with Lo-Solids

Brownstock washing

Oxygen Delignification

Knotting & Screening

O2

Bleaching A

D0

EOP

Pulp brightness 92% ISO Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 53 / © Andritz. Oy 2006

D1

Active chlorine 23 kg/ADT

P

Peroxide 5 kg/ADT

2405 ADMT/D Eucalyptus 92 ISO 27.5 kg act Cl/adt 3.7 kg H2O2/adt Viscosity >1000SCAN

Advances in eucalyptus pulp bleaching technology Eucalyptus Fiberline,Title 800.000 ADMT/a Presentation (fill in slide master)

Pulp brightness 92% ISO Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 55 / © Andritz. Oy 2006

Active chlorine 27,5 kg/ADT

Peroxide 3,7 kg/ADT

Advances in eucalyptus pulp bleaching technology Development of Chemical Pulp Mill during 10-15 years Presentation Title (fill in slide master) Driving forces: Efficiency -Quality- Environmental safety/Energy- Raw materials

Oxygen based Improved washing efficiency: chemicals: O2,O3,P,PAA DD-washers, New presses Removal of hex.u Improved cooking: -LoSolids, EAPC, 1995 -ITC, Supebatch

1990 Modern mill: 1000-1300 tpd C/DEDED Effluent 50-70 m3/t AOX 1,5-3,0 kg/t

Modern mill: 1600-2000 tpd DEoDD or ZPZP Effluent 10-20 m3/t AOX < 0.5 kg/t Surplus electricity+

Fiberline Division

3rd IEPC Belo Horizonte 4-7 March 2007 OP presentation title.ppt / 19 October 2006 / Slide no. 56 / © Andritz. Oy 2006

High dry solids, Control of non-process elements, Improved combustion +2007 systems

2000

Modern mill: 3000-4000 tpd A/DEopD(PO) or Modern mill: (ZD)EopDPO or 2500-3000 tpd Shorter sequence A/DEopD(PO) or Bleach filtrate treatment (ZD)EopDPO Chemical balance control Effluent 10-15 m3/t Effluent