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Floatation method of difficult-to-float coal

A coal slime flotation and difficult-to-float technology, applied in flotation, solid separation, etc., can solve the problems of low yield, hard-to-float slime cannot wash out qualified clean coal, etc., achieve large processing capacity per unit volume, improve drainage The effect of safety and buoyancy and process flexibility

Active Publication Date: 2009-10-14
SHANXI COKING COAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method of flotation of difficult-to-float coal slime, starting from the two links of pretreatment and flotation of difficult-to-float coal slime, and using a surface modifier in conjunction with a micro-bubble flotation device to solve the problem of difficult-to-float coal slime No qualified clean coal can be produced by mud washing, and the yield is low

Method used

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  • Floatation method of difficult-to-float coal
  • Floatation method of difficult-to-float coal
  • Floatation method of difficult-to-float coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment adopts surface modification and two-stage microbubble direct flotation process. process such asfigure 1 shown.

[0031] Firstly, the coal slime water mixture with a particle size of less than 0.5mm (concentration is 120g / l), together with the collector kerosene, enters the surface modification machine from the coal slurry inlet of the cylindrical main barrel (produced by Changsha Kaitong Technology Co., Ltd., with a processing capacity of 1000m 3 / h, feed pressure 0.1MPa), the amount of kerosene added is 0.95g / l coal slime mixture, the speed of the surface modifier is 157rpm, the coal particles and collector in the coal slime water are carried out step by step through the curved turbine type stirring impeller Dispersion, mixing, scrubbing, shearing and stirring, under the action of the high-speed shear force field of the surface reformer, process for 90 seconds. After the coal surface modification is completed, it is discharged from the coal slurry outle...

Embodiment 2

[0035] The basic process is the same as that of Example 1, except that this example adopts a process flow of surface modification and a stage of microbubble direct flotation.

[0036] Add 0.8kg of collector light diesel oil and 0.16kg of GF flotation agent into every ton of difficult-to-float slime-water mixture (concentration: 140g / l).

[0037] The feeding pressure of the surface modifier is 0.2MPa, the rotation speed is 200rpm, and the treatment is 60 seconds.

[0038] The air pressure of the microbubble flotation machine is controlled at 0.1MPa.

Embodiment 3

[0040] The basic process is the same as in Example 1, except that 1.0 kg of collector kerosene and 0.1 kg of pine oil are added in every ton of difficult-to-float slime-water mixture (concentration is 140 g / l).

[0041] The feeding pressure of the surface modifier is 0.3MPa, the rotation speed is 100rpm, and the treatment is 80 seconds.

[0042] The air pressure of the microbubble flotation machine is controlled at 0.4MPa.

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Abstract

The invention provides a flotation method for difficult-to-float coal slime, which uses a surface modifier combined with a micro-bubble flotation machine. Both the flotation and flotation effects can be effectively guaranteed, which solves the problem that the difficult-to-float slime cannot wash out qualified float products and the float yield is low. Since the two mechanisms have some similarities, after joint use, they can guarantee On the basis of ash content, the unit consumption of chemicals (collectors and foaming agents) is reduced by 20%, and the extraction rate of floating semen is increased by more than 10%.

Description

technical field [0001] The invention relates to a coal separation method, in particular to a difficult-to-float coal slime flotation method. Background technique [0002] Generally speaking, coal preparation methods mainly include gravity separation and flotation separation. At present, the separation of fine particle minerals (-0.5mm) is usually recovered by flotation separation in the world. Fine-grained coal below -0.5mm is difficult to separate and recover by gravity separation due to its relatively large surface area to mass ratio, and large-scale industrial production can only be recovered by flotation. [0003] With the mature application of large pressureless three-product dense medium cyclone, the gravity coal separation technology has stepped up to a new level, but the separation technology of fine coal has not yet made a breakthrough. [0004] The fine-grained coal separation technology is developed correspondingly with the improvement of coal mining mechanizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/02B03D1/004B03D1/008B03B1/00B03D101/02B03D101/04B03D103/08
Inventor 张来祥梁宇庞亮许慧英
Owner SHANXI COKING COAL GROUP
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