Method for separating oil and water of and circularly using degreasant tank-liquor using ultrafiltration technology

A technology of oil-water separation and degreasing tank, which is applied in the direction of separation method, filtration separation, immiscible liquid separation, etc. It can solve the problems of short tank liquid renewal cycle, affecting the working environment, and poor oil-water separation effect, so as to improve the efficiency of oil-water separation , The effect of purifying the working environment

Inactive Publication Date: 2004-06-02
FAW GROUP
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  • Abstract
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Problems solved by technology

This kind of oil-water separation method has poor oil-water separation effect. Because high temperature is required to break the emulsion, the energy consumption is high. High temperature will damage the active components of the degreasing bath and affect the working environment and increase the mechanical and electrical failure rate.
In addition, the renewal period of the bath solution is also short, generally 1 to 2 weeks

Method used

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  • Method for separating oil and water of and circularly using degreasant tank-liquor using ultrafiltration technology
  • Method for separating oil and water of and circularly using degreasant tank-liquor using ultrafiltration technology

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Embodiment Construction

[0007] Below is 30m of steel plate to be processed 3 Taking the degreasing tank as an example, the present invention will be described in detail in conjunction with the accompanying drawings.

[0008] Such as figure 1 As shown, the entire working process is composed of a degreasing tank 1, a settling tank 2, a circulation tank 3, a pre-filter 4, a pipeline 5, an ultrafilter 6, a pipeline 7, a pipeline 8, a cleaning tank 9, and a pipeline 10. Put the steel plate to be processed into the degreasing tank 1 for degreasing, and the upper part of the degreasing tank 1 contains more oily tank liquid into the settling tank 2, and after a certain period of natural standing, the floating oil in the upper part and the sediment in the lower part are removed. The bath liquid flows into the circulation tank 3, and then enters the pre-filter 4 through the circulation pipeline for pre-filtration, the pre-filtered bath liquid enters the ultra-filter 6 through the pipeline, and the ultra-filte...

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Abstract

In the ultrafiltration of degreasing tank liquid for oil-water separation and reusing, ultrafiltration membrane in certain specification is selected to intercept emulsified oil part of the tank liquid based on the size of the oil drops. Contaminated degreasing tank liquid is first processed in the deposition tank and circulating tank, then pre-filtered in the pre-filter and finally ultrafiltered in the ultrafilter before returning to degreasing tank for re-use. The intercepted liquid in the ultrafilter may be returned via pipeline to the pre-filter for re-filtering. The present invention has also one ultrafiltration membrane cleaning tank, cleaning liquid is injected via pipeline and the effluent is made to return into the pre-filter. The present invention has the features of saving in energy, saving in water, clean work environment, high oil-water separating rate, etc. The tank liquid has an updating period as long as three months.

Description

(1) Technical field [0001] The invention relates to a method for oil-water separation of degreasing bath liquid, in particular to a method for oil-water separation and recycling of degreasing bath liquid by using ultrafiltration technology. (2) Background technology [0002] At present, the methods of high temperature demulsification and overflow separation are mostly used for the oil-water separation of the degreasing bath. First, overflow the degreasing tank liquid with high oil content in the upper part of the degreasing tank into the oil-water separation treatment tank, heat it to 90-100 °C to break the emulsion, and then scrape the floating oil in the upper part out of the treatment tank by means of an electrically controlled mechanical scraper , the liquid in the lower part flows back into the degreasing tank to complete a cycle. This kind of oil-water separation method has poor oil-water separation effect and high energy consumption due to the need for high temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/02B01D36/00B01D61/14
Inventor 高宏伟高成勇张智
Owner FAW GROUP
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