Grading method for recovering refined coal from coal slime

Abstract

The invention relates to a method for recovering refined coal from coal slime, in particular to a grading method for recovering the refined coal from the coal slime. The method has the technical key points that by using a spiral classifier and the principle that 'sedimentation velocity in the liquid is different due to different particle sizes and specific gravities' of solid particles, the method realizes the separation between relatively high ash component and relatively low ash component by gravity classification; and 25-35% of plus sieve low ash refined coal with larger particle size can be recovered from the relatively high ash component, and 30-40% of minus sieve high ash coal slime with smaller particle size can be removed from the relatively low ash component. Through twice classification, the aim of 'removing the relatively high ash component in the coal slime' can be achieved. The embodiment of the invention can be used for recovering the refined coal from the coal slime, thus achieving the aim of reducing the ash content of the refined coal and meeting the demand of the user.

Description

technical field [0001] The invention relates to a method for recovering clean coal from coal slime, in particular to a method for recovering clean coal in coal slime by a classification method. Background technique [0002] Such as figure 1 As shown, the original production process of the coal washing plant is as follows: the raw coal mined in the mine is lifted by the mine car and poured into the raw coal feeder by the dumper, fed into the raw coal belt by the coal feeder, screened by the raw coal vibrating screen, and the product on the screen After entering the raw coal hand selection belt, the selected lump coal is crushed by a crusher and mixed with the product under the raw coal vibrating screen, and then transferred to the raw coal mine bin; during coal washing production, the raw coal is fed into the belt by the coal feeder under the raw coal bin Transfer to the jig machine for sorting, the selected medium coal and gangue are mixed and transferred to the medium coal...

AI Technical Summary

Problems solved by technology

[0003] The problems existing in the original production process mainly include: After the raw coal is sorted by the jig machine, the clean coal enters the A vibrating screen for screening, and the coarse-grained products on the screen can be controlled by controlling the jig sorting parameters and the A vibrating screen hole Adjust the size of clean coal ash; the fine-grained product under the sieve is pumped into the concentration tank through the A pump to concentrate, and then the underflow enters the filter to be filtered to become a filtered coal slime product. The ash content of the fine-grained filtered coal slime product in the original production process cannot be adjusted. The original clean coal product is sold as clean coal after mixing the coarse-grained product on the A vibrating screen and the filtered coal slime product, so the ash content of the original clean coal product is difficult to adjust

When the market changes and users require less than 10% of the ash content of clean coal, the original production process cannot be guaranteed, and the market sales are limited, which seriously affects the economic benefits of the company; therefore, adjust the ash content of clean coal to produce products that are suitable for production and sales , has become a top priority for mines

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