Patent ID: 11925944
Assignee: CHINA UNIVERSITY OF MINING AND TECHNOLOGY
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 5:
6. A separation method using the high-ash fine coal slime separation equipment according to claim 1, comprising the following steps:
a. starting the air compressor and inflating the damping pulsating water flow type flotation column through the microporous ceramic plate; starting the variable-frequency pump and adjusting a frequency of the variable-frequency pump by the PID control cabinet so as to adjust a pulsating water flow frequency and an amplitude: the higher the content of high ash in the coal slime is, the greater the pulsating water frequency and the amplitude are, on the contrary, the smaller the pulsating water flow frequency and the amplitude are; closing an accident discharging pipe of the mineralization chamber;
b. feeding flotation coal slime and medicaments into the stirring barrel to mix uniformly to generate an ore pulp mixture, feeding the ore pulp into the bubble generator under an effect of the pump, enabling the ore pulp mixture to suck air under a negative pressure generated under a jet flow action of the bubble generator and crushing the air to be mixed into the ore pulp mixture to form jet ore pulp;
c. enabling the jet ore pulp to continuously move downwards to the mineralization chamber, generating a strong turbulent flow effect under an action of a centrifugal force field of the mineralization chamber and a damping disk, performing efficient collision and adhesion between particles and bubbles in the jet ore pulp to form a gas-solid-liquid three-phase ore pulp body, discharging the three-phase ore pulp body from a mineralization chamber discharging port, enabling the discharged three-phase ore pulp body to enter the turbulent-flow dissipation pipe and then enter the damping pulsating water flow type flotation column from the flotation column feeding port after eliminating vortex in the three-phase ore pulp by a plurality of small steel pipes in the turbulent-flow dissipation pipe;
d. performing static separation after the three-phase ore pulp enters the damping pulsating water flow type flotation column, changing a flow velocity of the ore pulp when the ore pulp passes through the damping block, enabling one part of coarse clean coal in the ore pulp to successfully enter the active pulse flow region and the clean coal concentration region, and acting on a foam product generated in the three-phase ore pulp through pulsating water flow of the pulsating water flow pipe to remove high-ash materials in the foam product; taking particles in the three-phase ore pulp which are not mineralized and desorbed as coal particles difficult to separate to enter the air flotation scavenging region and performing secondary mineralization with microbubbles generated by the microporous ceramic plate to form a secondary mineralized foam product, thus enhancing recovery of the coal particles difficult to separate; and
e. finally enabling clean coal foam and coarse clean coal to overflow together to enter the clean coal overflow tank and be discharged, wherein mineralized particles and high-ash materials become underflow, and the underflow serves as a final tail coal to be discharged from the tail coal opening of the damping pulsating water flow type flotation column.