Settling tests were conducted with 15 wt.% density of LCC, MCC
and HCC using both de-ionised water and saline water in line with
the flotation. Settling tests provide indirect information on the
association of clay platelets and the rheology property of clay suspensions. In this study, the slurry was transferred to a 500 mL
graduated cylinder after conditioning at pH 9.0. The cylinder was
then stoppered and inverted for 5 times to ensure that the slurry
was well mixed. Long-term settling tests were carried out and
the thickness of the interface was recorded.