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A sorting method of difficult-to-float slime

A technology for slime and difficult-to-float, applied in flotation, solid separation and other directions, can solve the problems of low flotation recovery rate, difficult-to-float slime, and poor hydrophobicity of difficult-to-float slime, and achieves significant economic benefits and easy flotation. , 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 sorting method for difficult-to-float coal slime, which fundamentally solves the problem of low flotation recovery rate caused by poor hydrophobicity of difficult-to-float coal slime by introducing nano-bubbles into flotation

Method used

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  • A sorting method of difficult-to-float slime

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Effect test

Embodiment 1

[0025] 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

[0028] 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 flotation method for a coal having poor floatation comprises the following steps: supplying, by means of a pump (E), a solution containing nanobubbles (5) to a mineral slurry mixing tank (F), and simultaneously supplying an appropriate amount of coal (7) and a flotation reagent (8) to the mineral slurry mixing tank (F); and supplying, by means of a material feeding pump (G), a mineral slurry mixture (9) to a countercurrent static micro-bubble flotation column (H) to undergo floatation, thereby obtaining two resulting products, a fine coal (10) and a tailing (11). The flotation reagent consists of the following components: a kerosene, isopropyl ethylthionocarbamate, Tween 40, sodium alcohol ether sulphate, p-Toluenesulfonic acid, Span 60, phthalic anhydride, sodium dodecyl benzene sulfonate, and benzenedicarboxylic anhydride. The method utilizes a property of nanobubbles that the same preferentially gather at a hydrophobic surface, increasing the difference in hydrophobicity between the fine coal and coal gangue. The gathering of the nanobubbles also significantly reduces a fine mud covering a coal particle surface, thereby greatly reducing contamination caused by the fine mud, and increasing a recycling rate of the fine coal.

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. 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 difficult to adhere to or can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/016B03D1/008B03D1/02B03D101/02B03D101/04B03D103/08
CPCB03D1/008B03D1/016B03D1/02B03D2201/02B03D2201/04B03D2203/08
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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