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