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Method and device for separating impurites from suspension by floatation method

A technology of suspension and flotation, applied in flotation, mixing method, solid separation, etc., can solve the problem that the size of the bubbles is difficult to adjust, and achieve the effect of favorable flow characteristics and easy adjustment

Inactive Publication Date: 2006-02-08
ANDRITZ AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pressure used in this method is 0.6-1.2 bar, and the size of the generated bubbles is difficult to adjust

Method used

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  • Method and device for separating impurites from suspension by floatation method
  • Method and device for separating impurites from suspension by floatation method
  • Method and device for separating impurites from suspension by floatation method

Examples

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Embodiment Construction

[0023] figure 1 is a schematic diagram of a flotation apparatus having the apparatus of the invention for expanding a liquid saturated with gas in the form of a bubble injector 4 in which the air bubbles required for the flotation process are formed in the liquid . The flotation cell 6 is itself largely filled with a suspension 5, the froth 7 forming on its surface contains air bubbles and the suspension 5 contains as many solid particles as possible that are removed by flotation. This foam is carried to the foam channel 8 with the demister 16 and discharged as float F.

[0024] Part of the purified water K from the recirculation stream is pressurized to the required saturation pressure 3-10 bar with a booster pump 1 and sent to a saturation tank 2 . Air from the surrounding area is pressurized to the required saturation pressure with compressor 3, after which it is also sent to saturation tank 2 and dissolved in the liquid by intensive mass transfer. The liquid, whose pres...

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PUM

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Abstract

The method for removing interfering substances from suspensions by flotation involves decompression of a gas-saturated liquid separately, before it is introduced into the suspension containing interfering substances. Also claimed is an apparatus for implementation of the method. It comprises a separate decompression unit (4), a unit (2) for enriching a liquid with a gas, and a flotation cell (6).

Description

technical field [0001] The present invention relates to a method for separating impurities from a suspension by flotation, the method comprising aerating a liquid until saturated, followed by expanding the gas-saturated liquid, forming gas bubbles during the expansion. Background technique [0002] Froth flotation is a physical method of removing impurities from a suspension. This method requires that the generated bubbles be reasonably distributed in number and size. Hydrophobic or water-repellent substances are brought to the surface of the liquid by the air bubbles attached to them and are expelled together with the foam. This method is known from DE 41 16 916 C2 and has reached a high state of the art. Non-priming self-priming injectors are often used to generate air bubbles and mix them into the suspension. Here, the flow of the contaminated suspension discharged from the nozzle creates a negative pressure and draws in gas, which mixes with the suspension due to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/24B05B7/00C02F1/24B03D1/02B01F3/04B01F5/04B01F5/06B03D1/14
CPCB03D1/1412B03D1/1475B01F5/0653B01F3/04992B01F5/0646B03D1/24C02F1/24B01F5/0413B01F3/04446B03D1/1431B01F23/235B01F23/291B01F25/312B01F25/4336B01F25/433B03D1/02
Inventor B·舍尔青格H·加布尔
Owner ANDRITZ AG