Shred
The term "shred" designates sheared pieces of end-of-life tyres. The shred is composed of elements of different sizes, essentially measuring between 25 mm and 350 mm.
Primary shredding consists of tearing or fragmenting operations on end-of-life tyres. The average overall composition of shred is similar to that of whole tyres.
Shredding
Typical examples of shreds
- Cement works (alternative fuel)
- Steelworks
- Foundries
- Granulation
- Urban heating
| Property | Passenger car ELT | Truck ELT | Source |
|---|---|---|---|
| Net calorific value (MJ.kg-1) | 30.2 | 26.4 | (Aliapur, 2009) |
| 28.4 | 28.5 | (Aliapur, 2015) | |
| Biomass fraction (%w) | 18.3 | 29.1 | (Aliapur, 2009) |
| 18.9 | 28.0 | (Aliapur, 2015) |
The following chemical compositions are extracted from an Aliapur report (French, 2015)
| Element | Passenger car ELT | Truck ELT |
|---|---|---|
| Carbon (C) | 64 - 68 % | 61.5 – 68 % |
| Iron (Fe) | 12 – 16 % | 16 - 25 % |
| Hydrogen (H) | 5.8 – 6.4 % | 5.5 - 6.4 % |
| Oxygen (O) | 3.8 – 4.9 % | 1.5 – 3.2 % |
| Silicon (Si) | 1.8 - 2.4 % | 0.3 – 1.5 % |
| Zinc (Zn) | 1.1 – 1.3 % | 1.3 – 1.6 % |
| Sulfur (S) | 1.3 – 1.4 % | 1.4 - 1.8 % |
| Element | Passenger car ELT | Truck ELT |
|---|---|---|
| Nitrogen (N) | 0.5 – 0.6 % | 0.3 - 0.45 % |
| Calcium (Ca) | 0.2 – 0.3 % | 0.04 – 0.09 % |
| Manganese (Mn) | 0.0001 – 0.0010 % | 0.1 – 0.2 % |
Aluminum, Arsenic, Barium, Brome, Chlorine, Chrome, Cobalt, Copper, Magnesium, Molybdenum, Nickel, Phosphorus, Lead, Potassium, Sodium, Titanium, Manganese
Below quantification limit (<0.001 %)
Selenium, Antimony, Beryllium, Vanadium, Mercure
Below quantification limit (<0.002 %)
Fluorine, Cadmium, Thallium
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