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Enviroment friendly utilization of fly ash for 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

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enviroment friendly utilization of fly ash for geopolymers

Enviroment friendly utilization of fly ashfor Geopolymers

IPW 2010

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

Lecturer: Dr. Gábor Mucsi

contents
contents
  • 1 INTRODUCTION
  • 2 CIRCUMSTANCES
  • 3 FLOWSHEET OF PLANT
  • 4 MACHINES
  • 5 APPLICATIONS
1 introduction problems of fly ash
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 introduction possible applications
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
slide5

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 introduction aim of the project
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
2 CIRCUMSTANCES
  • Q= 75000 tons/year
  • Plant works 8 h/day and 230 days/year
  • Q= 41 t/h
  • ρ=0,9 kg/ dm3
slide8

Feed

3 Flow sheet

Q = 41 t/h

Geopolymer

Screening

2,5 t/h

> 5 mm

38,5 t/h

Drying

9,5 t/h

n = 25%

29 t/h

Grinding

> 45 µm

Air classifier

29 t/h

Buffering

forming compacting
Forming,Compacting

Activator

(NaOH/KOH)

additives

Mixing

Ageing

Heat treatment

Cooling

Final product

4 machines
4 Machines
  • Screening
  • Zemmler STDT 4200
  • Througput: 20-150 m3/h
  • Fine fraction: 2 – 80 mm
4 machines1
4 Machines
  • Holo-flite-dryer
  • Metso Q3028
  • Length: 6 m
  • Heating: use of waste heat
4 machines2
4 Machines
  • Ball mill
  • Zhengzhou M 3645
  • X80 < 40µm
  • Througput: 29 – 65 t/h
  • Motor power: 1250 kW
4 machines3
4 Machines
  • Air classifier
  • Througput: 40t/h
  • Fine fraction > 45µm
4 machines4
4 Machines
  • Mixer
  • Filling quantity Mixer (loose aggregates): 9600 kg
  • Drive power: 160 kW
  • Througput: 29 t/h

need 7 mixer