Flint Pebbles

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Product Benefits
Technical Details

image(2)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.


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

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