In order to develop a better understanding of the role
of the froth phase in coal flotation, froth stability
measurements have been conducted using a continuous
flotation cell. The results indicate that the mass flow
rate of coal or mineral matter reporting to the product is
linearly related to the flow rate of water reporting to the
product. This relationship has been used to distinguish
the relative contributions of hydrophobic attachment or
hydraulic entrainment to the total product recovery.
Simple mathematical expressions have also been developed to
characterize the cleanability of various coals.
A mathematical model based on first principles has
been developed to provide additional insight into the
complex relationship between the various operating
parameters of a flotation cell and the froth behavior. The
predicted results compare favorably to actual flotation
test data for most conditions. In addition, a simple
method was developed to study the fundamental interactions
of various frothing agents with coal particles. The
results of these studies indicate that the adsorption
behavior of frothers in the presence of coal depends on
both the physical properties of the frothing agent and the
coal.
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