A Separation Method for Coarse Coal Slime in Interference Bed by Cyclone Sweeping

Abstract

The invention discloses a method for sorting coarse coal slime in a swirling flow sweeping disturbed bed. The water flow is fed into the swirling flow sweeping section from the water inlet along the tangential direction of the disturbed bed column to form two water flows. One outer spiral flow runs along the inner wall of the disturbed bed column. Moving downward, another internal spiral flow moves upward around the axis of the disturbed bed column; the coarse slime enters the sorting section from the feed inlet, and the settled coarse slime meets the upward water flow in the sorting section to form a stable fluidized bed, realizing coarse Coal slime separation, the final clean coal is discharged from the overflow weir, and the bottom flow of the sorting section enters the swirling flow sweeping section; the coarse coal slime entering the swirling flow sweeping section is under the action of the centrifugal force field, and the high-density coarse slime enters the outer spiral flow downward The coarse coal slime with low density that cannot be effectively sorted in the sorting section enters the inner spiral flow, moves upward, and enters the sorting section through the turbulent flow plate for re-sorting. High-density coarse coal slime can be effectively sorted, and the sorted coarse coal slime has a wide particle size to ensure the quality of clean coal.

Description

Technical field [0001] The invention relates to a sorting method, in particular to a method for sorting coarse coal slime in a swirling sweeping interference bed. Background technique [0002] At present, the coarse slime separation equipment that is more industrialized at home and abroad mainly includes: water medium cyclone, slime dense medium cyclone, spiral separator, liquid-solid fluidized bed separator, etc. Spiral sorting machine, the sorting principle is that the difference in the force of different density particles on the spiral groove surface results in the difference of their moving speed, which is finally reflected in the different distribution along the radius of the spiral groove surface, so that the particles of different density are completed. sorting. It has a good separation effect for easy coal separation, but the height of the machine is large, and the process parameters are not easy to adjust when the coal quality changes. When the separation density is low...

AI Technical Summary

Problems solved by technology

However, with the deteriorating coal quality of the selected raw coal in the coal preparation plant and the stricter requirements of the users on the separation effect, the traditional two-product liquid-solid fluidized bed coarse slime separator has gradually exposed some problems in practical application: ( 1) Clean coal products polluted by high ash fine mud

(2) The separation effect of refractory coarse coal slime with high intermediate density content is poor

Coarse coal slime in most coal preparation plants is difficult or extremely difficult to separate. The ash content of the overflow coarse and clean coal in the liquid-solid fluidized bed is relatively high, while the underflow ash content is relatively low, and the separation progress is poor.

(3) The range of effective sorting granularity is too narrow to expand

The lack of high-precision separation equipment and separation methods for this particle size range seriously restricts the development of coal preparation technology, and has gradually become a bottleneck problem for coal preparation plants to ensure product quality and improve economic benefits.

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