Bentonite OCMA:
|
16 m3/tone (min) |
Yield point |
|
|
15ml (max) |
Water loss |
|
|
10% (max) |
Moisture |
|
|
2 w.t % (max) |
Residue on ASTM sieve No: 100 (dry method) |
|
|
2.5 w.t % (max) |
Residue on ASTM sieve No: 200 (water method) |
|
Bentonite (API):
|
30 (min) |
Viscometer Dial, 600 rpm |
|
3 (max) |
Yield Point/ Plastic Viscosity Ratio |
|
15 ml (max) |
Filtrate Volume |
|
4%w (max) |
Residue Greater than 75 µm |
Bentonite (for steel industry):
|
600%w (min) |
Wate absorption (plate test method) |
|
6%w (max) |
Moisture |
|
20%w (max) |
Residue on ASTM sieve No:325 |
Bentonite (for foundry):
|
Sodium bentonite |
Chemical composition |
|
26-30%w |
Gelling (after 24 hours) |
|
26-34cm3 |
Swelling factor (2g) |
|
11-Aug |
pH |
|
75%w (min) |
Methylene blue absorption |
|
10%w |
Moisture |
|
1100 (0°C) |
Sinter point |
|
9%w |
Loss on Ignition (LOI) |
|
750-950 g/cm2 |
Green compressive strength |
|
17-20 g/cm2 |
Green Tensile strength |
|
7-10%w |
Residue on ASTM Sieve No.200 |
The main uses of bentonite are for drilling mud, binder (e.g. foundry-sand bond, iron ore pelletizer), purifier, absorbent (e.e. pet litter), and as a groundwater barrier. As of around 1990, almost half of the US production of bentonite was used for drilling mud.
