Method for treating cutting fluid waste water and recovering active ingredient of cutting fluid by utilizing extraction process

A technology of active ingredients and cutting fluid, which is applied in the field of extraction method to treat cutting fluid wastewater and its active ingredients recovery, can solve the problems of not being able to obtain ideal treatment effects, achieve high environmental and economic benefits, improve use quality, and improve extraction efficiency Effect

Pending Publication Date: 2019-07-09
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For cutting fluid wastewater with high COD concentration and severe emulsification, the existing treatment methods cannot obtain ideal treatment effects

Method used

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  • Method for treating cutting fluid waste water and recovering active ingredient of cutting fluid by utilizing extraction process

Examples

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Effect test

Embodiment 1

[0034] A kind of method utilizing extraction method to process cutting fluid waste water and its active ingredient recovery, concrete steps are:

[0035] (1) With 20t of fresh cutting fluid waste water taken from a mechanical processing plant, after coarse filtration to remove solid precipitation, 900kgNaOH was added thereto, and stirred and demulsified in the demulsifier;

[0036] (2) Input the cutting fluid wastewater obtained after the treatment in step (1) into a high-speed centrifuge, and centrifuge for 10 minutes at a speed of 7500r / min to remove sediment;

[0037] (3) Input the cutting fluid waste water obtained after step (2) into the mixing clarifier, and add 7t of isopropyl ether to carry out the extraction operation. After standing and stratifying, the lower layer is the cutting liquid waste water after extraction, and the upper layer is A mixture of extractants and active ingredients in cutting fluid wastewater;

[0038] (4) Repeat step (3) twice for the cutting f...

Embodiment 2

[0043] A kind of method utilizing extraction method to process cutting fluid waste water and its active ingredient recovery, concrete steps are:

[0044] (1) Take 20 tons of fresh cutting fluid waste water from a certain mechanical processing plant, after coarse filtration to remove solid precipitation, add about 730kgKOH to it, and stir and break the emulsion in the demulsifier;

[0045] (2) Input the cutting fluid wastewater treated in step (1) into a high-speed centrifuge, and centrifuge for 10 minutes at a speed of 10000r / min to remove sediment;

[0046] (3) The cutting fluid waste water obtained after step (2) is processed by 2m 3 The flow rate of / h is continuously pumped from the top of the tower into the extraction tower, and the bottom of the tower is pumped into 1.0m 3 / h of petroleum ether for extraction. The discharge at the bottom of the tower is the cutting fluid waste water after extraction, and the extract produced at the top of the tower is the mixture of the...

Embodiment 3

[0051] A kind of method utilizing extraction method to process cutting fluid waste water and its active ingredient recovery, concrete steps are:

[0052] (1) Take 30t of fresh cutting fluid waste water from a machinery processing factory, after coarse filtration to remove solid precipitation, add NaOH in an amount of 60 kg per ton of water, and stir and demulsify in the demulsifier;

[0053] (2) Input the cutting fluid wastewater obtained after the treatment in step (1) into a high-speed centrifuge, and centrifuge for 10 minutes at a speed of 7000r / min to remove sediment;

[0054] (3) the cutting fluid waste water obtained after step (2) is processed by 5m 3 The flow rate of / h is sequentially pumped into three centrifugal extractors in series, and the flow rate is 2.5m 3 The flow rate per hour is sequentially pumped into n-hexane from the last extractor countercurrently to carry out the extraction operation. The waste water at the outlet of the last extractor is the cutting ...

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Abstract

The invention relates to a method for treating cutting fluid waste water and recovering an active ingredient of a cutting fluid by utilizing an extraction process. The method comprises the following specific steps: (1) adding a base substance into filtered cutting fluid waste water, and performing demulsification; (2) performing centrifugation on the demulsified mixed liquid to separate a precipitate; (3) performing multi-stage countercurrent extraction on the centrifuged mixed liquid by using an extraction agent to obtain an extract and extraction wastewater; (4) performing distillation on the extract, wherein the distillate is used as a recovered extraction agent, and the tower kettle liquid is the active ingredient of the cutting fluid; and (5) performing adsorption refining treatment on the active ingredient of the obtained cutting fluid, wherein the processed active ingredient of the cutting fluid can be reused for preparing a cutting fluid to realize recycling. The method provided by the invention is simple and easy to operate, and can effectively reduce COD in the waste water and realize recycling of the active ingredient in the cutting fluid waste water, thereby having veryhigh industrial application value.

Description

technical field [0001] The invention belongs to the technical field of treatment of cutting fluid wastewater in the machining industry, and in particular relates to a method for treating cutting fluid wastewater by using an extraction method and recovering effective components thereof. Background technique [0002] Cutting fluid is a commonly used coolant and lubricant in metal processing and machining. It has the functions of cooling and lubricating to protect the cutting tool and ensure the accuracy of the processed parts. Cutting fluid is made of various functional additives through scientific compound compatibility, which contains surfactants and various additives (such as refrigerants, rust inhibitors, preservatives, etc.), and is milky white and opaque, and will be processed during use. The oil in the cutting fluid enters, forming an environmental waste liquid with high COD concentration and serious emulsification, which leads to more prominent environmental problems. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/001C02F1/38C02F1/26C02F1/04C02F1/28C02F1/40
Inventor 盖恒军张晓伟宋红兵肖盟夏林泓韩丽
Owner QINGDAO UNIV OF SCI & TECH
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