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Method for recovering alkali from electroplating degreasing waste liquid

A waste liquid and hollow technology, which is applied to chemical instruments and methods, alkali metal compounds, metallurgical wastewater treatment, etc., can solve the problems of complex equipment, blockage, cumbersome operation, etc., and achieve low concentration, simple operation, and high alkali recovery rate. Effect

Inactive Publication Date: 2021-06-11
苏州融和福天宝环保科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese Invention Patent Publication No. CN103572635A, titled "Chemical Fiber Pulp Cellulose Alkaline Squeeze Liquid Processing and Recovery Process", proposes to use multi-stage membrane filtration to recover cellulose and lye from the alkali squeeze liquid. The primary membrane used is nano The filter membrane, the electroplating degreasing solution contains suspended solids and a large amount of oil. If it directly enters the nanofiltration membrane, it will quickly cause clogging, and the method is complicated in equipment and cumbersome in operation.

Method used

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  • Method for recovering alkali from electroplating degreasing waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The electroplated degreasing waste liquid 1000L, wherein the sodium hydroxide concentration is 1 mol / L, oil concentration 329 ppm, COD4500 ppm, metal ion concentration: Al 156 ppm, Fe 101PPM, Cu 44 ppm, Zn 230 ppm. 3 kg of activated carbon was added to the waste liquid, and after 30min at normal temperature, the carbon mixture was obtained.

[0045] The resulting microfiltration device is introduced into the ultrafiltration device by 10 micrometer aperture, the ultrafiltration membrane is introduced into a PP material, and the molecular weight 50000 is intercepted, and the ultrafiltration is completed under normal temperature and 0.1 MPa pressure, the ultrafiltration is 90%. .

[0046]The recovered ultrafiltration was introduced into the nanofiltration device, and the nanofiltration membrane used was a sulfonated polyether sulfone material, and the elongated molecular weight was 720 Daltons, nanofiltration pressure 0.5 MPa, obtained by nanofiltration, nanofiltration recov...

Embodiment 2

[0050] Based on the embodiment, the nanofiltration membrane is exchanged to the alkali-resistant filming of 200 Daltons, and the nanofiltration pressure is 0.8 MPa, and other conditions are identical to Example 1.

[0051] The sodium hydroxide concentration of sodium hydroxide was 1 mol / L, no oil, COD of 531 ppm, metal ions, COD, and COD, and 4.51 ppm, Cu 0.23 ppm, Zn 4.5 ppm, to reagent, alkali solution. The total recovery rate of the resulting alkali is 75%,

Embodiment 3

[0053] Based on the embodiment, the ultrafiltration membrane is exchanged to a film having a molecular weight of 10,000 Daltons, ultrafiltration pressure 0.3 MPa, and other conditions are identical to Example 1.

[0054] In the obtained nanofiltration, sodium hydroxide concentration of 1 mol / L, oil containing 0.4 ppm, COD is 655 ppm, metal ions Al9.7 ppm, Fe 1.1 ppm, Cu 1.5 ppm, Zn 8.7 ppm, to reagent, alkali solution. The total recovery rate of the obtained alkali solution was 74%.

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Abstract

A method for recovering an alkali from electroplating degreasing waste liquid is provided. The electroplating degreasing waste liquid is sequentially subjected to adsorption, microfiltration, ultrafiltration and nanofiltration to remove solid particles and oil in the electroplating degreasing waste liquid, the concentration of COD and metal ions of the liquid is greatly reduced, and a recyclable alkali liquid is obtained. The method provided by the invention is simple to operate and high in alkali recovery rate.

Description

Technical field [0001] The present invention relates to the field of sewage treatment, and more particularly to a method of recovering a base from an electroplated degreasing waste liquid. Background technique [0002] The electroplating industry is a high pollution water industry. The electroplating wastewater is complex, and the wastewater contains both copper, chromium, nickel and other metal ions, cyanide, etc., but also contain organic compounds such as oil, solvent, surfactant. Some electroplating wastewater also contain high concentrations of acid or base. If there is a valuable component such as the value of the acid and alkali, resources can be saved, and the cost can be saved; if not processed or handled properly, it will cause huge damage to the natural environment and human health. The electroplating degreasing waste liquid is typically generated by electroplating the metal element, thus containing a large amount of cleaning agent and saponified liquid, which contains...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C01D1/28C02F103/16
CPCC02F9/00C01D1/28C02F1/283C02F1/444C02F1/442C02F2103/16C01P2006/80
Inventor 陈志超刘建军席丽丽赵伟刚黄建阳石勇
Owner 苏州融和福天宝环保科技有限责任公司
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