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Flotation technology for wide-size coal slime

A coal slime flotation, wide-grain technology, applied in flotation, solid separation and other directions, can solve the problems of the upper limit of flotation particle size and flotation efficiency can not be taken into account at the same time, the flotation particle size is narrow, the upper limit of particle size is low, etc. The upper limit of the separation particle size, the effect of improving the flotation efficiency and broadening the particle size range

Active Publication Date: 2016-06-29
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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  • Flotation technology for wide-size coal slime

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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 flotation technology for wide-size coal slime. The flotation technology comprises the ore pulp preparation work, the high-pressure jetting work, the bubble removal work and the flotation work in a teetered bed-self-circulation flotation column; the bubble removal technology is added after a self-absorption micro-bubble generator, non-active bubbles are removed through the bubble removal work, the phenomenon that excessive bubbles enter the teetered bed-self-circulation flotation column and form an ultra-thick bubble layer is avoided, the influence of the non-active bubbles on subsequent sorting is eliminated, appropriate common bubbles are generated through a bubble generator of the teetered bed-self-circulation flotation column according to needs, the common bubbles and active micro-bubbles are adjusted for realizing the appropriate proportion by controlling the consumption of bubble forming agents, and therefore the floatation efficiency can be improved to the maximum degree.

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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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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