Underground coal preparation technology adopting aqueous medium

Abstract

The invention discloses an underground coal preparation technology adopting an aqueous medium and is applicable to underground coal mines. Raw coal is fed into an underground special compact jigger, clean coal is discharged, is dehydrated by the aid of a phi1-mm fixing sieve and then is screened by a phi13-mm classifying sieve, final clean coal water is dehydrated by a clean coal centrifugal dehydrator, and final clean coal and a centrifugal liquid are obtained; jigging middling coal is discharged and classified by the phi13-mm classifying sieve into lump middling coal and final middling coal,the final middling coal is dehydrated by a middling coal centrifugal dehydrator, and final middling coal and a centrifugal liquid are obtained; produced slime water is sent to an aqueous medium classifying and sorting swirler, the first section of the swirler plays a classifying role, first-section underflow enters the second section of the swirler for sorting, and second-section overflowing coarse and fine slime and underflow coarse and middling slime are obtained; the coarse and middling slime and the coarse and fine slime pass through a coarse and middling slime arc-shaped sieve I and a coarse and fine slime arc-shaped sieve J, the coarse and middling slime and the coarse and fine slime which are pre-dehydrated on the sieves are obtained, and the coarse and middling slime and the coarse and fine slime are obtained after dehydration. The technology is simple, the sorting equipment reliability is relatively high, the dynamic load is relatively low, and the sorting precision is high.

Description

technical field [0001] The invention relates to a coal preparation process, and is especially suitable for an aqueous medium underground coal preparation process used in underground coal mines. Background technique [0002] With the development and utilization of coal resources, the mining depth continues to increase, and a large number of gobs are facing problems such as surface subsidence, and coal preparation in the well will bring huge pressure to the ecological environment around the coal preparation plant, so the underground coal preparation technology has a very important role. immediate requirement. [0003] At present, coal preparation methods are divided into two types: wet method and dry method. Wet method refers to the coal separation method carried out in water medium, such as jigging separation method, dense medium cyclone separation method, etc.; dry method Coal preparation refers to the coal separation method carried out in the air. Dry coal preparation incl...

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Problems solved by technology

[0004] 1. The size range of sorting is small, and the sorting effect of fine-grained materials is poor, which affects the sorting efficiency of dry sorting

[0005] 2. The water content of the raw materials is high, and the water spraying and dust reduction in the underground coal mining process will bring in a large amount of water, which will cause fine-grained coal to agglomerate and affect the coal preparation effect

[0006] 3. The lower limit of dry coal preparation is high, and the separation effect of fine-grained materials is difficult to guarantee. It is necessary to screen out fine-grained materials, which increases the difficulty of coal preparation

[0007] 4. The energy consumption of dry coal preparation equipment is higher than that of wet coal preparation equipment

[0009] 1. Wet coal preparation will produce a large amount of slime water, which is difficult to wash and clarify

[0010] 2. Heavy medium sorting needs to increase the process of heavy medium preparation and recovery. This part of equipment needs to take up a lot of space, which is contradictory to the limited space available underground.

[0011] In addition, in order to adapt to complex coal quality characteristics and give full play to the best working effect of existing equipment, raw coal is usually selected by classification, adding pre-screening links, increasing the dynamic load of downhole equipment, and making the separation process more complicated

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