Synergistic effect of SPS compound surfactant and diesel oil on low-rank coal slime flotation

In order to improve the collection performance of diesel oil on low-rank coal slime flotation, SPS (Span80, Polysorbate, sodium dodecyl sulfate) composite emulsifier was mixed with diesel fuel to prepare SPS microemulsion, as a collector for coal slime flotation. When the ratio of SPS emulsifier to diesel oil is 1:2, clean coal yield and the combustible recovery reached the highest, they were 50.16% and 82.65%, respectively. Through Contact angle test, Zeta potential analysis, EDLVO theoretical calculation, the mechanism of SPS microemulsion improving the flotation effect of low-rank coal slime was discussed. The Synergistic adsorption of SPS emulsifier and diesel oil on coal surface increases the coal surface contact Angle by 24.8 degrees, increase the absolute value of Zeta potential on coal surface in solution by 9.14 mV, the energy barrier of the total interaction energy (V-T) was increased from 8.4 x 10(-18)J to 9.8 x 10(-18)J. The coal particles treated by SPS microemulsion have the best dispersion and contact with collector droplets more fully. SPS microemulsion can be used as a new collector for low-rank coal slime flotation.