Transcript Enviroment friendly utilization of fly ash

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
 5 APPLICATIONS
1 INTRODUCTION
problems 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
 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 INTRODUCTION
aim of the project
 Ethical
 Economical
Sustainable development
 Save the raw materials
 Substitute landfilling by utilization
 Save energy
 Reduce CO2 Emissions
Save the environment
2 CIRCUMSTANCES
 Q= 75000 tons/year
 Plant works 8 h/day and 230 days/year
 Q= 41 t/h
 ρ=0,9 kg/ dm3
3 Flow sheet
Feed
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
Activator
(NaOH/KOH)
Mixing
Forming,
Compacting
Ageing
Heat treatment
Cooling
Final product
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