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A wide particle size coal slime flotation process

A coal slime flotation, wide-grain technology, applied in flotation, solid separation and other directions, can solve the problems of flotation particle size upper limit and flotation efficiency cannot be taken into account at the same time, narrow flotation particle size, and low particle size upper limit, etc. The effect of improving the yield of clean coal, increasing the upper limit of flotation particle size, and reducing production and management costs

Active Publication Date: 2018-06-15
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to overcome the technical defects of narrow flotation particle size, low upper limit of particle size, complex process and inability to simultaneously take into account the upper limit of flotation particle size and flotation efficiency in the existing coal slime flotation process, the present invention provides a wide particle size coal slime flotation selection process

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  • A wide particle size coal slime flotation process

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Embodiment Construction

[0023] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0024] The slime ash in a coking coal preparation plant is 26.11%, the maximum particle size is 6-7mm, and the particle size composition is shown in Table 1. Put the coal slime into the slurry mixing tank, and at the same time add collector (diesel) for slurry mixing, the amount of collector is 1.5kg / t dry coal slime, and the stirring time is 3 minutes; the mixed slurry is passed through the high-pressure jet The pump is fed into the self-priming micro-bubble generator with a pressure of 0.25Mpa, and the pulp discharged from the micro-bubble generator enters the defoaming mixing tank, and is stirred for 2 minutes to defoam; the defoamed pulp is fed into the interference bed-self-circulation flotation Column, add foaming agent (No. 2 oil) through the bubble generating device of the interfering bed-self-circulation flotation column, the amount of fo...

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Abstract

The invention discloses a wide-grained coal slime flotation process, which includes pulp preparation, high-pressure jet flow, defoaming and flotation in a disturbed bed-self-circulation flotation column. By adding a defoaming process after the self-priming micro-bubble generator, the non-active bubbles are removed through the defoaming operation, and too many bubbles are prevented from entering the disturbed bed. The effect of sorting, by interfering with the bed - the bubble generator of the self-circulating flotation column introduces appropriate ordinary bubbles as needed, and controls the amount of foaming agent to adjust the ratio of ordinary bubbles and active microbubbles to the greatest extent. Improve flotation efficiency.

Description

technical field [0001] The invention relates to the technical field of coal slime flotation, in particular to a wide-grain fraction coal slime flotation process. Background technique [0002] At present, flotation is the most important method for sorting and recovering coal slime. According to the difference in wettability of coal and gangue surface, the clean coal in coal slime is recovered under the action of flotation reagents. However, due to the large shedding force of coarse particles attached to air bubbles and the high turbulence environment of traditional mechanical agitation flotation machines, the flotation effect of coarse particles is not good, and the upper limit is generally not more than 0.5mm. In order to solve the separation problem of coarse coal slime and increase the upper limit of coal slime flotation particle size, the flotation efficiency must be greatly reduced. Under the condition of not only wanting to increase the upper limit but also to ensure ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/02B03D1/006B03D101/02B03D101/04B03D103/08
CPCB03D1/006B03D1/02B03D2201/02B03D2201/04B03D2203/08
Inventor 李琳由晓芳吕宪俊吴雷
Owner SHANDONG UNIV OF SCI & TECH
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