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Method for weakening hydration repulsive force among coal slime particles to promote agglomeration by alternating electric field

An alternating electric field and slime water technology, applied in the direction of magnetic field/electric field water/sewage treatment, can solve the problems of large equipment, large settlement area, and large production lag, so as to reduce the area of ​​settlement equipment, reduce environmental pollution, The effect of compact production process

Inactive Publication Date: 2013-01-23
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

This traditional method has the following disadvantages: 1. The hydration of the particle surface is not considered, and the sedimentation effect is not sufficient and thorough
2. The consumption of medicine is large and the cost is high
3. Larger settling area requires larger and more settling and concentrating tanks. The equipment is huge and the production hysteresis is large, which is not conducive to automatic control.

Method used

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  • Method for weakening hydration repulsive force among coal slime particles to promote agglomeration by alternating electric field
  • Method for weakening hydration repulsive force among coal slime particles to promote agglomeration by alternating electric field
  • Method for weakening hydration repulsive force among coal slime particles to promote agglomeration by alternating electric field

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specific Embodiment approach

[0023] The specific implementation of the method of alternating electric field weakening the hydration repulsion between coal slime particles to promote agglomeration is to apply an alternating electric field to the coal slime water, thereby weakening the hydration repulsion between coal slime particles to promote the reunion of coal slime particles; coal slime water refers to coal slime Coal slime water with a hydration film thickness of not less than 10nm on the particle surface.

[0024] Determination of thickness of hydration film on the surface of coal slime particles:

[0025] Set the slime particles as spheres, and use formula (1) to obtain the thickness of the hydration film:

[0026]

[0027] In formula (1), η is the viscosity of coal slime water; η o is the viscosity of the water medium after removing the slime particles; t l is the thickness of the hydration film; R is the radius of the dry slime particle; Among them, V is the total volume of the slime soluti...

Embodiment 1

[0033] The concentration of the slime water is 10g / L, the pH value is 8, the main minerals in the slime are quartz and kaolin, the particle size is less than 0.10mm, and no chemical agent is added. An alternating electric field is applied to the slime water. The voltage of the alternating electric field is 300V, the frequency The frequency is 100Hz, and the waveform is a sine wave, so that the slime water is settled, and the light transmittance of the supernatant is 7.5% higher than that of natural settlement.

Embodiment 2

[0035] The concentration of the slime water is 30g / L, the pH value is 8.5, the main minerals in the slime are quartz and kaolin, the particle size is less than 0.074mm, and no chemicals are added. An alternating electric field is applied to the slime water. The voltage of the alternating electric field is 300V, the frequency It is 100Hz, and the waveform is sine wave, so that the slime water is settled, and the light transmittance of the supernatant is 6.8% higher than that of natural settlement.

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Abstract

The invention discloses a method for weakening hydration repulsive force among coal slime particles to promote agglomeration by an alternating electric field, and is characterized in that the alternating electric field is applied to coal slime water, so that the hydration repulsive force among the coal slime particles is weakened to promote the agglomeration of the coal slime particles. By the method to treat the coal slime water, the consumption of a drug is effectively decreased, the occupation space of equipment is effectively reduced, the production cost is reduced, the clarity of obtained circulating water is high, the coal slime water is well controlled not to be exhausted outside, the environment-friendly effect is realized, and the loss and waste of coal resources are reduced.

Description

technical field [0001] The invention relates to a method for weakening the hydration repulsion between coal slime particles by an alternating electric field to promote their agglomeration, especially for coal slime water which is difficult to treat by the coagulation agent method widely used at present, and can also be used for particles with strong hydration industrial wastewater treatment. Background technique [0002] The components that are difficult to settle in the slime water are mainly produced by the muddying of the gangue in the raw coal. With the improvement of coal mining mechanization, the content of gangue in the raw coal increases, resulting in an increase in the highly muddy slime water produced during the coal preparation process. The coal slime water agent consumes a lot, and the clarified water has a large solid content, which seriously affects the quality of circulating water and the normal production of the coal preparation plant. The main reasons for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/48
Inventor 李宏亮闵凡飞
Owner ANHUI UNIV OF SCI & TECH
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