Enviroment friendly utilization of fly ash for Geopolymers IPW 2010 J. Hoppe, M. Tschamani, J....

Enviroment friendly utilization of fly ashfor Geopolymers

IPW 2010 J. Hoppe, M. Tschamani, J. Petermann, M. Rohmann

Lecturer: Dr. Gábor Mucsi

contents

1 INTRODUCTION

2 CIRCUMSTANCES

3 FLOWSHEET OF PLANT

4 MACHINES

5 APPLICATIONS

1 INTRODUCTIONproblems of fly ash

Present production rate of fly ash In the United States about 131 million tons of fly ash

are produced annually 125 mio t/year in the EU, 300 mio t/year China+India

Groundwater contamination Spills of bulk storage Landfilling

1 INTRODUCTIONpossible applications Portland cement

can replace up to 30% by mass of Portland cement can add to the concrete’s final strength and increase

its chemical resistance and durability Only class C ash (contains more than 20% lime ,

does not require an activator )

Geopolymers

Geopolymers The reacting product consists of SiO4 and AlO4

tetrahedrons (network) Can be made from natural sources of pozzolanic

material such as fly ash (class F fly ash) Resistant to chemicals Rapid-hardening with high strenghts High density Temperature stable Ecological construction material

(pozzolanic = A pozzolan is a siliceous or siliceous / aluminous material that, when mixed with lime and water, forms a cementitious compound )

1 INTRODUCTIONaim of the project Ethical Economical

Save the raw materials Substitute landfilling by utilization Save energy Reduce CO2 Emissions

Save the environment

Sustainable development

2 CIRCUMSTANCES

Q= 75000 tons/year

Plant works 8 h/day and 230 days/year

Q= 41 t/h

ρ=0,9 kg/ dm3

Feed

Screening

Buffering

Air classifier

Grinding

Drying

> 45 µm

> 5 mm

n = 25%

3 Flow sheet

Q = 41 t/h

2,5 t/h

38,5 t/h

29 t/h

9,5 t/h

Geopolymer

29 t/h

Forming,Compacting

Ageing

Heat treatment

Cooling

Final product

Activator(NaOH/KOH) Mixing additives

4 Machines

Screening

Zemmler STDT 4200 Througput: 20-150 m3/h Fine fraction: 2 – 80 mm

4 Machines

Holo-flite-dryer

Metso Q3028 Length: 6 m Heating: use of waste heat

4 Machines

Ball mill Zhengzhou M 3645

X80 < 40µm Througput: 29 – 65 t/h Motor power: 1250 kW

4 Machines

Air classifier

Througput: 40t/h Fine fraction > 45µm

4 Machines

Mixer

Filling quantity Mixer (loose aggregates): 9600 kg

Drive power: 160 kW Througput: 29 t/h

need 7 mixer

5 Application of final material

5 Application of final material

Thank you for your attention