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A sorting method for difficult-to-float slime based on nanobubbles

A nano-bubble and slime technology, applied in flotation, solid separation and other directions, can solve the problems of low flotation recovery rate, poor hydrophobicity of difficult-to-float slime, etc., and achieves significant economic benefits, low solution efficiency and good effect.

Active Publication Date: 2017-05-24
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a method for sorting difficult-to-float coal slime based on nano-bubbles. By introducing nano-bubbles into flotation, the problem of low flotation recovery rate caused by poor hydrophobicity of difficult-to-float coal slime is fundamentally solved.

Method used

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  • A sorting method for difficult-to-float slime based on nanobubbles

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Experimental program
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Effect test

Embodiment 1

[0024] Such as figure 1 , water (2) and secondary octanol foaming agent (1) are fed into the mixing tank (A) and mixed, the proportioning of water and foaming agent is 0.07g foaming agent per liter of water, and the mixture after stirring (3 ) is fed into the Venturi tube (C) through the mixture feeding pump (B), the mixture dissolves air under the negative pressure generated by the jet and generates a large number of bubbles at the end of the Venturi tube (C), and the solution containing bubbles (4) is fed to the Venturi tube (C). Enter the upper part of the defoaming barrel (D), and a baffle is installed in the middle of the defoaming barrel (D), which divides it into two parts. (D) On the right side, the large air bubbles in the mixture rise to the upper part of the defoaming barrel under the action of buoyancy and gradually burst, so that the air bubbles generated by the Venturi tube (C) are removed after passing through the defoaming barrel (D), Leave the nano-bubbles in...

Embodiment 2

[0027] Such as figure 1 , put water (2) and 2-octanol (1) into the mixing tank (A) for mixing, the proportion of water and foaming agent is 0.033g foaming agent per liter of water, and the mixture (3) after stirring is passed through the mixture The feed pump (B) feeds into the Venturi tube (C), the mixture dissolves the air under the negative pressure generated by the jet and generates a large number of bubbles at the end of the Venturi tube (C), and the bubble-containing solution (4) is fed into the defoaming On the upper part of the barrel (D), a baffle plate is installed in the middle of the defoaming barrel (D), which divides it into two parts. The two parts of the barrel are only connected to the lower part. On the right, the large bubbles in the mixture rise to the upper part of the bubble removal tank under the action of buoyancy and gradually burst, so that the bubbles generated by the Venturi tube (C) pass through the bubble removal tank (D) and the large bubbles are...

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Abstract

A method of selectively separating a coal slurry with poor floatation employing nanobubbles comprises: mixing water (2) and an appropriate amount of a foaming agent (1) evenly and providing the same to a Venturi tube (C) via a pump (B), injecting, via the Venturi tube (C), a flow, to generate a large amount of air bubbles including large bubbles and nanobubbles; providing, to a bubble elimination tub (D), a bubble containing solution (4), wherein while the larger bubbles having greater buoyancy ascend to a surface of the solution and then burst, the nanobubbles having less buoyancy are blended into the solution and move with a water flow; providing, to a normal mixing tub (F), a nanobubble-containing solution (5), coal slurry (7), and an appropriate amount of a floatation solvent (8) to mix the same, and selectively separating, by a floatation column (H), the mixed coal slurry (9), to produce refined coal (10) and tailings (11).

Description

technical field [0001] The invention relates to a coal slime sorting technology, and in particular provides a sorting method for difficult-to-float coal slime based on nano-bubbles. Background technique [0002] With the improvement of my country's coal mining mechanization, the deterioration of resource geological conditions, the large-scale construction of coal preparation plants and the wide application of dense medium separation technology, the proportion of high-ash refractory coal slime has increased sharply and continues to deteriorate. The contradiction of sorting is more prominent. At present, flotation is one of the most important methods to deal with coal slime. In the conventional flotation process, the coal particles with better hydrophobicity collide with the air bubbles and adhere to the air bubbles, and float with the air bubbles to the foam phase, and finally become buoyant coal particles. Clean coal; and gangue particles with poor hydrophobicity are difficu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/02B03D1/006B03D101/04B03D103/08
CPCB03D1/006B03D1/02
Inventor 桂夏辉邢耀文李臣威曹亦俊杨自立王东岳
Owner CHINA UNIV OF MINING & TECH
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