Bentonite

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.