Enviroment friendly utilization of fly ash for Geopolymers
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Transcript of 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
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