This document discusses the use of an A TEC Rocket Mill® to maximize the use of solid alternative fuels at Wietersdorfer & Peggauer Cement in Austria. It describes the operational results showing a 71.5% reduction in operating costs compared to the old system. It also notes that the higher quality alternative fuel produced by the Rocket Mill allows for savings of around 200kg/hour of coal usage while maintaining the same clinker quality and production levels. In conclusion, the Rocket Mill provides positive impacts on the pyroprocess including better burnout, higher clinker quality, and more stable operating conditions.

1. Maximizing solid alternative fuels
With the A TEC Rocket Mill® at Wietersdorfer & Peggauer Cement, Austria
HANOI / 22nd August 2018. Dr Stefan Kern

2. LOESCHE Symposium Hanoi 2018 22.08.2018
Maximising solid alternative fuels
With the A TEC Rocket Mill® at Wietersdorfer & Peggauer
Cement, Austria
W & P Zement Wietersdorf
A TEC Rocket Mill®
Operational results Rocket Mill® for main burner fuel
01
03
02

3. LOESCHE Symposium Hanoi 2018 22.08.2018
Maximising solid alternative fuels
With the A TEC Rocket Mill® at Wietersdorfer & Peggauer
Cement, Austria
W & P Zement Wietersdorf
A TEC Rocket Mill®
Operational results Rocket Mill® for main burner fuel
01
03
02

4. LOESCHE Symposium Hanoi 2018 22.08.2018
W&P Zement
4
Location of cement plant Wietersdorf

5. LOESCHE Symposium Hanoi 2018 22.08.2018
W&P Zement
5
▪ Headquarters: Klagenfurt / Austria
▪ Founded in 1893
▪ Turnover: approx. € 600 million
▪ Employees: approx. 3,000
▪ Locations: in 30 countries
▪ Cement Plant Wietersdorf / Austria
– Wietersdorf kiln line: max. 2.200 tpd
– approx. 100.000 t/y RDF
– TSR (RDF) rate 80-85%
– 50% RDF is processed at plant site

6. LOESCHE Symposium Hanoi 2018 22.08.2018
W&P Zement
6
Projects developed by A TEC together with W&P Zement
First Project - Cyclones
Cement Mill Dedusting
1992
01
Dedusting system
Cyclones for Clonker cooler dedusting
1993
02
1990
Study on preheater
Implementation study Precalciner/Preheater
2003
03
2000
Sewage sludge drying
Gas handling system
2011
04
Kiln conversion from Lepol to precalciner
New preheater, calciner and Chlorine Bypass
2006
05
2010
06
A TEC XMercury
Mercury emission reduction, first installation worldwide
2014
A TEC Rocket Mill®
RDF preparation for main burner
2014
07
Today
TSR > 80 %
2018
12 14 16 1802 04 06 0892 94 96 98

7. LOESCHE Symposium Hanoi 2018 22.08.2018
W&P Zement
7
System diagramme SAF preparation in Wietersdorf
Pre-shredder Shredder
Fine shredding,
A TEC Rocket Mill®Fe separatorHeavies
separation
< 300 mm < 80 mm
< 15 mm
Main burner
Impurities
Truck delivery
< 80 mm
Storage

8. LOESCHE Symposium Hanoi 2018 22.08.2018
W&P Zement
8
RDF preparation with the A TEC Rocket Mill®
▪ In operation since 2014
▪ Drive power: 250/315 kW
▪ Single chamber pilot mill
▪ Throughput: approx. 2.5 t / h (finished product)
▪ Size reduction from 80 mm to <15 mm
▪ Specific energy requirements: approx. 65 kWh / t
▪ Moisture reduction: around 8-10%

9. LOESCHE Symposium Hanoi 2018 22.08.2018
Maximising solid alternative fuels
With the A TEC Rocket Mill® at Wietersdorfer & Peggauer
Cement, Austria
W & P Zement Wietersdorf
A TEC Rocket Mill®
Operational results Rocket Mill® for main burner fuel
01
03
02

10. LOESCHE Symposium Hanoi 2018 22.08.2018
A TEC Rocket Mill® RM 2.5 Double
10
General information
▪ Two grinding chambers
▪ Power controlled
▪ Direct drive

11. LOESCHE Symposium Hanoi 2018 22.08.2018
A TEC Rocket Mill® RM 2.5 Double
11
Grinding tools
▪ Horizontally rotating chains
▪ Special chain links
▪ Screen for final product size

12. LOESCHE Symposium Hanoi 2018 22.08.2018
A TEC Rocket Mill® RM 2.5 Double
12
Discharge of organics
▪ Automatic discharge during operation
▪ Slide gate releases the impurities
▪ Impurities do not enter product

13. LOESCHE Symposium Hanoi 2018 22.08.2018
A TEC Rocket Mill® RM 2.5 Double
13
Final product
▪ Size defined with screen size
− E.g. ø 15 mm screen -> max. 15 mm,
approx. 50% < 5 mm.
▪ Increased specific surface (‘fluffy’ like
cotton)
▪ Drying effect during the grinding
process up to 10 %

14. LOESCHE Symposium Hanoi 2018 22.08.2018
A TEC Rocket Mill® RM 2.5 Double
14
Quality improvement of the fuel
Ash reduction Moisture reduction
Size reduction Specific surface increase
SAF Quality
• Separation of inorganics
• Easy discharge of impurities
• Max. output defined by
sieve
• Simultaneous drying effect
• Release of approx. 10 % (rel.) of
the moisture content
• Very fibrous after shredding
• Size reduction by crushing, not
cutting

15. LOESCHE Symposium Hanoi 2018 22.08.2018
A TEC Rocket Mill® RM 2.5 Double
15
Final product size < 15 mm < 30 mm
Screen size Ø 15 mm Ø 30mm
Output size < 15 mm / ~ 50 % < 5 mm < 30 mm / ~ 40% < 10 mm
Throughput 8 - 10 t/h 15-17 t/h
Specific power consumption 50 - 60 kWh/t < 15 mm final 30 - 35 kWh/t < 30 mm final
Dimension 8.530 x 4.160 x 6.000 l x b x h (mm)
Weight 62.000 kg
Drive unit 2 x 315 kW
Rotor speed ~ 580 min-1
Discharge 2 x conveyor screws
Key performance data

16. LOESCHE Symposium Hanoi 2018 22.08.2018
A TEC Rocket Mill® RM 2.5 Double
16
Possible new treatment line
< 15 mm
Existing treatment line
pre-shredder shredder
fine shredder
(cutting)
screen (opt.)
Fe separator opt. heavy
separation
< 250 mm < 80 mm < 15 mm
> 250 mm
pre-shredder
Rocket Mill®
screen (opt.)
Fe separator opt. heavy
separation
< 250 mm
< 15 mm> 250 mm

17. LOESCHE Symposium Hanoi 2018 22.08.2018
A TEC Rocket Mill®
17
Advantages
▪ Size reduction from < 300mm to 15 mm in one
grinding step
▪ Saving of one shredding step
▪ Easy to operate
▪ Easy to maintain
▪ Robust construction
▪ Drying effect during operation
▪ Separation of FE and non-FE materials
▪ Different output fuel particle sizes for main
burner and calciner possible

18. LOESCHE Symposium Hanoi 2018 22.08.2018
A TEC Rocket Mill® RM 2.0 Mobile
18
Advantages
▪ Compact design
▪ Small footprint
▪ Easy installation

19. LOESCHE Symposium Hanoi 2018 22.08.2018
A TEC Rocket Mill® RM 2.0 Mobile
19
Basic data
Basic data of Rocket Mill® RM 2.00 single
▪ Drive unit: 1 x 315 kW
▪ Rotor speed: 750 rpm
RDF 90% < 30 mm
▪ Throughput: 6 - 7 t/h
▪ Specific power consumption: 30 - 35 kWh/t

20. LOESCHE Symposium Hanoi 2018 22.08.2018
Maximising solid alternative fuels
With the A TEC Rocket Mill® at Wietersdorfer & Peggauer
Cement, Austria
W & P Zement Wietersdorf
A TEC Rocket Mill®
Operational results Rocket Mill® for main burner fuel
01
03
02

21. LOESCHE Symposium Hanoi 2018 22.08.2018
Results W&P Zement
21
Comparison of operating costs old system vs. Rocket Mill®
Shredder Cutting mill Rocket Mill®
Wear 18,1 %
Man power 26,3 %
Electricity 26,7 %
Total costs 22,4 %
Wear 10,4 %
Man power 6,6 %
Electricity 85,3 %
Total costs 28,5 %
Wear 81,9 %
Man power 73,7 %
Electricity 73,3 %
Total costs 77,6 %
Shredder & cutting mill vs. A TEC Rocket Mill® in % of total preparation costs
Saving in operating costs - 71,5 %

22. LOESCHE Symposium Hanoi 2018 22.08.2018
Results W&P Zement
22
▪ Due to the higher quality of AF produced with the rocket mill, the coal amount could be reduced.
▪ Comparison of clinker production with same clinker quality and roughly same kiln feed:
▪ This allows savings in coal consumption of around 200 kg/h with 120 t/h kiln feed.
Coal savings on the existing system W&P with AF from the Rocket Mill®
Kiln feed [t/h] Coal at main burner [t/h]Coal per kiln feed [kg/t]
April 122,11 1,91 15,6
July 115,01 1,61 14,0

23. LOESCHE Symposium Hanoi 2018 22.08.2018
A TEC Rocket Mill® RM 2.5 Double
23
▪ Better burnout of AF in kiln due to improved physically properties
▪ High clinker quality due to reducing reduction atmospheres
– Reduction of Fe2+ content (brown clinker)
– Less sulphure circulation
▪ Less water content in system
▪ Higher substitution rates and higher capacity
▪ Stable condition due to more homogenized product
Positiveimpact onpyroprocess

24. THANK YOU
for your attention
Dr Stefan Kern
Email: s.kern@atec-ltd.com