Coarse slime separation process

Abstract

The invention discloses a coarse slime separation process. Raw coal enters a first desliming screen, siftage enters a three cone angle hydrocyclone for separation, the obtained base flow substance enters a second desliming screen for desliming, and the overflow substance enters a third desliming screen for desliming; second oversize is mixed with first oversize to enter a heavy medium system for separation; third oversize enters a slime centrifugal machine or a sedimentation filter centrifugal machine for centrifugal separation to obtain centrifugal liquid and clean coal; and second oversize, third oversize and the centrifugal liquid are mixed to enter a slime water system for processing, slime water of the slime water system goes to floatation directly or goes to concentration directly for recycling. The three cone angle hydrocyclone is combined with the heavy medium system, and accordingly clean coal ash content of the three cone angle hydrocyclone is guaranteed, and run-off large granular clean coal in the base flow can be recycled. By the combination of the three cone angle hydrocyclone and the heavy medium system, a coarse slime system is perfected and comprehensive efficiency of the coarse slime system is increased by 4-5 percent.

Description

technical field [0001] The invention belongs to the technical field of coal preparation. Background technique [0002] In the coal preparation industry, according to the washing method, it can be divided into washing with desliming and washing without desliming. The technology related to the present invention is desliming and washing process. [0003] The traditional desliming and washing process is that after the raw coal is classified by a 1-2mm sieve, the material under the screen enters the hydraulic grading cyclone for further classification, the overflow in the hydraulic grading cyclone enters the slime water system, and the bottom flow is dehydrated by the high frequency sieve After that, it is mixed into the material on the raw coal grading sieve and fed to the dense medium cyclone for separation. The disadvantages of the above sorting process are: 1. The classification and desliming effect of the hydraulic classifying cyclone is not ideal, because the hydrocyclone...

AI Technical Summary

Problems solved by technology

The disadvantages of the above sorting process are: 1. The classification and desliming effect of the hydraulic classifying cyclone is not ideal, because the hydrocyclone has obvious concentration effect while grading, so that a large amount of fine mud is mixed into the underflow and re-enters the heavy 2. The high mud content of the dense medium system not only affects the normal operation of the dense medium system, but also reduces the separation effect; at the same time, it also affects the working effect of the magnetic separator, and the dense medium cannot be recovered efficiently. Severe dielectric loss

The disadvantage of this process is that the separation accuracy of coarse coal slime separation equipment TBS, spiral chute, etc. is low. Although the ash content of clean coal can meet the user's requirements, a large amount of clean coal is lost in the underflow (coarse medium coal), and the economic loss of the enterprise is serious.

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