Steam coal washing processing method for easy-to-argillization gangues

Abstract

The invention belongs to the field of coal dressing of steam coal and particularly relates to a steam coal washing processing method for easy-to-argillization gangues. The steam coal washing processing method for the easy-to-argillization gangues is a coal preparation process which specifically comprises the following steps: carrying out 13-mm dry screening after crushing raw coal and adopting a dense-medium shallow slot to separate coal blocks with the size of 150mm-13mm, wherein powder coal with the size which is less than 13mm is not selected; recycling coarse slime, filter-pressing fine slime and carrying out closed cycle of washing water. The steam coal washing processing method adopts the dry screening so that the argillization of the gangues is reduced to the greatest extent, and the load of a slime water system is relieved; meanwhile, a product is flexible in structure and strong in adaptability and can be adapted to possible changes of coal quality and markets in the future.

Description

technical field [0001] The invention belongs to the field of thermal coal preparation, and in particular relates to a thermal coal washing and processing method in which gangue is easy to muddy. Background technique [0002] Mudification involved in the coal preparation process includes two parts, one is muddying of coal, and the other is muddying of gangue. [0003] The coal mudification site includes two meanings: one refers to the crushing of raw coal under washing conditions and the characteristics of secondary slime produced; the other is the internalization characteristics of coal and gangue in coal under washing conditions- - Re-shredding the situation. The reasons for muddying are generally divided into physical reasons and chemical reasons, among which physical reasons are the main ones. When coal and gangue are immersed in water, due to physical movement and collision, the coal and gangue particles will have cracks or the original small cracks will be enlarged, t...

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Problems solved by technology

[0009] In summary, dense medium shallow tank separation is feasible as the main washing process for peaty coal, but the traditional dense medium shallow tank separation process is still stuck in the trap of "the start of coal preparation plant is also the day of transformation". Embarrassing, there are mainly the following disadvantages: a. Due to the requirement of the lower limit rate of the feed particle size in the dense medium shallow groove discharge process, the traditional screening process adopts 13mm dry screening and increases the 3mm (or 2mm) long screening surface. Wet desliming, the advantage of this process is that the feed rate can be guaranteed, but wet desliming makes part of the final coal soaked in water, which increases the sliming time of gangue and increases the processing burden of coal slime water; b ignores gangue The impact on coal preparation equipment after sliming, the selection of inappropriate coal slime recovery equipment, such as screen sedimentation centrifuge, pressurized filter, etc., due to the serious gangue sliming, the proportion of clay in fine particles is relatively large, and the screen settlement The screen mesh of the centrifuge and the filter membrane of the pressurized filter are easily smeared, causing the equipment to fail to work normally; c, the selection of coal slime water treatment equipment is relatively small, because the equipment selection in the design of the coal preparation plant is mainly based on specifications , and the standard can not be suitable for the widely varying coal seam occurrence conditions and the nature of coal and gangue;

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