Ammonium sulfate is an inorganic salt primarily used as a soil fertilizer, food additive, and for drinking water treatment. It is produced from ammonia gas and sulfuric acid, and its production processes involve various centrifugation techniques. Key production equipment includes SHS and Conturbex centrifuges, which differ in solid concentration handling, product transport methods, and particle breakage rates.

1. Ammonium Sulfate

2. The basics of Ammonium Sulfate
 Ammonium Sulfate is an inorganic salt with a number of
commerical uses
 The most common uses are as
 soil fertilizer
 food additives
 in the treatment of drinking water

3. Fertilizer
 fertilizer for alkaline soils
 lowering the pH balance of
the soil
 contributing essential
nitrogen for plant growth.

4. Food Additives | Acid Regulator (E517)
 (GRAS) - U.S. Food and
Drug Administration
 E517 - European Union
 used as an acidity
regulator in flours and
breads

5. Treatment of drinking water
 used in combination with
chlorine
 to generate
monochloramine for
disinfection

6. Ammonium Sulfate
Production

7. Out of ammonia gas and sulfuric acid

8. Recovering out of wastewater

9. By-product –
desulfurization of coke oven gas or wastewater

10. Centrifuges
Successfully used in Ammonium Sulfate processes

11. SHS pusher centrifuge

12. CONTURBEX Screen Scroll Centrifuge

13. Typical Machine Sizes
SHS
pusher centrifuge
CONTURBEX
screen scroll
centrifuge
302 250
402 320
502 400
602 520
702 700
802 1000
1002 1200

14. Selection Criterias
For SHS & CONTURBEX

15. Minimum of the solid concentration in the feed
Average diameter d50 %w/w
< 0,5 mm 20
> 0,5 mm 20
CONTURBEX
SHS
Average diameter d50 %w/w
< 0,5 mm 40
> 0,5 mm 35

16. Key points
SHS CONTURBEX
Solid layer + + + + +
Solid
concentration
+ + + +
Product
washing
+ + + + +
Product
transport
+ + + +
G-force + + + +
Gas-tight
execution
+ + + + + +CONTURBEX
SHS

17. Solid Layer
CONTURBEX
SHS
 Smooth product transport
 less particle breakage
 less solid losses to filtrate due to high
thickness of solid layer
 Thinner solid layer provides a quick
dewatering
 but may cause more particle breakage and
higher losses of solids in the filtrate

18. Solid Concentration
CONTURBEX
SHS
 High and stable solid concentration is
requested
 Low and varying solid concentration can be
handled

19. Product washing
CONTURBEX
SHS
 Very good washing efficiency
 due to long retention time of product on the
screen
 Partly limited washing efficiency
 due to short retention time

20. Product transport
CONTURBEX
SHS
 No forced product transport
 product remains in the drum after feeding stop
 Cleaning is requested before restarting the
machine to prevent high vibrations
 Forced product transport by the scroll - “self-
cleaning”
 minimum remaining product after feeding stop

21. G-force
CONTURBEX
SHS
 low g-force
 Smooth product transport and less particle
breakage
 Higher g-force provides a quick dewatering
 but more stressful product transport (scroll)
 may cause higher particle breakage and
higher losses of solids in the filtrate

22. Gas-tight execution
CONTURBEX
SHS
 Vapour- and gas tight execution available
 Vapour- and gas tight execution available