It is well known
that mixed collectors can effectively strengthen
the flotation of low-rank coal. However, less concern has been paid
to the detachment of low-rank coal flotation using mixed collectors.
In this study, the force of air bubble detachment from low-rank coal
surface treated by oleic acid (OA), dodecane (D), and oleic acid–dodecane
(OA–D) collector mixture was investigated using microforce
balance. The results showed that the process of bubble detachment
from the low-rank coal surface was divided into three stages: relaxation
stage, stretching stage, and sliding stage. The equilibrium contact
angle and critical contact angle were the transition points between
different stages. The order of detachment force required for bubble
detachment from the surface of low-rank coal was OA–D >
OA
> D, indicating a synergistic effect between OA and D. Based on
the
three parameters of equilibrium contact angle, critical contact angle,
and contact line length, a theoretical model was proposed to calculate
the detachment force. The calculated results were in agreement with
the measured results.
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