Flint Pebbles

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Grinding media choice is an important factor in ceramics and ground sand production, influencing both manufacturing costs and product quality.
Sibelco’s range of flint pebbles deliver superior performance as a grinding media. Our pebbles are mineralogically composed of Chalcedony.
The crystalline structure of Chalcedony is a stand out characteristic against quartzite alternatives, offering a range of benefits:
Wear resistance – (Less pebbles required)
Only 4.5 kg of Sibelco pebbles are needed to grind 1000 kg of white ceramic body, compared to 7 to 20 kg of other pebbles.
For hard products (silica sand, feldspar) 6 to 9 kg of Sibelco pebbles are needed to grind 1000 kg.
(These values are purely indications, based on our experience, but depending on final fineness, and ball mill.)
Less abrasion:
Sibelco’s pebbles have a lower abrasion rate than alternative products. Tests conducted show an abrasion rate of only 37 mm³ using Sibelco pebbles, compared to 47 mm³ for alternative products.
This all equates to less dead time in refilling ball mill charge, an important issue for both production yield, and safety.
Production:
Sibelco’s flint pebbles are finally hand sorted and controlled by experienced staff to remove:
- Unrelated material (bad shape or nature)
- Broken pebbles
- Chemically polluted product
Sibelco offers 8 flint pebble products.
Size (cm) | 2/4 | 3/5 | 4/6 | 6/8 | 8/10 | 10/12 | 12/15 | 15/20 |
---|---|---|---|---|---|---|---|---|
Tolerance | 10% < Lower Size / 100% < Upper Size |
Chemical Analysis (XRF)
Element | Units | Typical Value |
---|---|---|
SiO2 | % | 98.4 |
TiO2 | % | 0.005 |
Al2O3 | % | 0.1 |
Fe2O3 | % | 0.04 |
CaO | % | 0.15 |
MgO | % | 0.01 |
K2O | % | 0.03 |
Na2O | % | 0.06 |
P2O5 | % | 0.03 |
MnO | % | 0.03 |
% | 1.1 |
Physical Properties
Parameter | Unit | Typical Value |
---|---|---|
Specific Gravity | g/cc | 2.6 |
Apparent Density | g/cc | 1.6 |
Hardness | Mohs | 8 |
Porosity | % | 0.38 |