Recovery process for waste zinc ions in viscose production

A technology of viscose fiber and zinc ions, which is applied in the field of recovery process of waste zinc ions in the production of viscose fiber, can solve the problems of zinc waste and environmental pollution, and achieve the effect of effective recovery

Active Publication Date: 2018-04-13

YIBIN HIEST FIBER +1

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AI-Extracted Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of waste of zinc and environmental pollution caused by a large amount of sediment formed in the treatment of zinc-containing wastewater in the production of viscose fiber without treatment, and provides a...

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Method used

(4) the pH value that step (3) obtains is 12~13 filtrate II and adjusts pH value with the sulfuric acid solution of 5g/L to be respectively 1.5,3.5,5.5, then adopt macroporous chelating type divinyl Benzene polymerized ion exchange resin adsorbs zinc ions in ...

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Abstract

The invention provides a recovery process for waste zinc ions in viscose production. The recovery process comprises the following steps: 1, viscose wastewater treatment: a step of adding lime powder into viscose production wastewater, and carrying out a reaction so as to obtain a precipitate; 2, adding a sulfuric acid solution into the precipitate obtained in the step 1, and carrying out dissolving and filtering so as to obtain a filtrate I; 3, adding sodium hydroxide into the filtrate I obtained in the step 2 until the pH value of the filtrate I is 7 to 14, and after completion of a reaction,carrying out filtering so as to obtain a filtrate II; 4, adjusting the filtrate II to acidity by using a sulfuric acid solution, and allowing macroporous chelated divinyl benzene polymerized ion-exchange resin to adsorb zinc ions in the filtrate II; and 5, rinsing the macroporous chelated divinyl benzene polymerized ion-exchange resin which adsorbs the zinc ions in the filtrate II in the step 4 by adopting a sulfuric acid solution so as to obtain a zinc sulfate eluent and complete recovery of waste zinc ions. The process provided by the invention has simple operation, can effectively recoverthe zinc ions in the precipitate formed in zinc-containing wastewater treatment, and reduce environmental pollution.

Application Domain

Sludge treatmentSpecific water treatment objectives +4

Technology Topic

IonViscose +8

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Examples

Experimental program(10)

Example Embodiment

[0020] Example 1

[0021] A recovery process for waste zinc ions in viscose fiber production, comprising the steps of:

[0022] (1) Viscose fiber wastewater treatment: add lime powder to the wastewater generated in the production of viscose fiber, react and settle to obtain sediment;

[0023] (2) Add sulfuric acid solution to the sediment obtained in step (1), stir and dissolve, then filter to obtain filtrate I, set aside,

[0024] (3) adding sodium hydroxide to the filtrate I obtained in step (2), so that the pH of the filtrate I is 7, after the reaction, filter to obtain the filtrate II for subsequent use;

[0025] (4) Adjust the filtrate II to be acidic with a sulfuric acid solution, and then use a macroporous chelating type divinylbenzene polymerized ion exchange resin to absorb zinc ions in the filtrate II;

[0026] (5) Use sulfuric acid solution to rinse the macroporous chelated divinylbenzene polymer ion exchange resin that has absorbed zinc ions in the filtrate II in step (4) to desorb zinc ions, and obtain zinc sulfate elution rich in zinc ions. solution to complete the recovery of waste zinc ions.

Example Embodiment

[0027] Example 2

[0028] A recovery process for waste zinc ions in viscose fiber production, comprising the steps of:

[0029] (1) Viscose fiber wastewater treatment: add lime powder to the wastewater generated in the production of viscose fiber, react and settle to obtain sediment; wherein, the amount of lime powder added is 30kg per ton of wastewater.

[0030] (2) Add sulfuric acid solution to the sediment obtained in step (1), stir and dissolve, then filter to obtain filtrate I, set aside,

[0031] (3) adding sodium hydroxide to the filtrate I obtained in step (2), so that the pH of the filtrate I is 8, after the reaction, filter to obtain the filtrate II for subsequent use;

[0032] (4) adjust the pH of filtrate II to 3.5 with sulfuric acid solution, and the concentration of said sulfuric acid solution is 5g/L; then adopt macroporous chelating type divinylbenzene polymerized ion exchange resin to adsorb zinc ions in filtrate II;

[0033] (5) Use sulfuric acid solution to rinse the macroporous chelated divinylbenzene polymer ion exchange resin that has absorbed zinc ions in the filtrate II in step (4) to desorb zinc ions, and obtain zinc sulfate elution rich in zinc ions. solution to complete the recovery of waste zinc ions.

Example Embodiment

[0034] Example 3

[0035] A recovery process for waste zinc ions in viscose fiber production, comprising the steps of:

[0036] (1) Viscose fiber wastewater treatment: add lime powder to the wastewater generated in the production of viscose fiber, react and settle to obtain sediment; wherein, the amount of lime powder added is 35kg per ton of wastewater.

[0037] (2) Add sulfuric acid solution to the sediment obtained in step (1), stir and dissolve, and filter to obtain filtrate I, for subsequent use, the concentration of the sulfuric acid solution is 2g/L; wherein, the volume of the sulfuric acid solution and the sediment The mass ratio is 5:1.

[0038] (3) adding sodium hydroxide to the filtrate I obtained in step (2), so that the pH of the filtrate I is 9, after the reaction, filter to obtain the filtrate II for subsequent use;

[0039] (4) adjust the pH of filtrate II to 4 with sulfuric acid solution, and the concentration of said sulfuric acid solution is 5g/L; then adopt macroporous chelating type divinylbenzene polymerized ion exchange resin to adsorb zinc ions in filtrate II;

[0040] (5) Use sulfuric acid solution to rinse the macroporous chelated divinylbenzene polymer ion exchange resin that has absorbed zinc ions in the filtrate II in step (4) to desorb zinc ions, and obtain zinc sulfate elution rich in zinc ions. liquid, complete the recovery of waste zinc ions, wherein, in this step, the concentration of the sulfuric acid solution is 3%.

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Classification and recommendation of technical efficacy words

Effective recycling

Recovery process for waste zinc ions in viscose production

A technology of viscose fiber and zinc ions, which is applied in the field of recovery process of waste zinc ions in the production of viscose fiber, can solve the problems of zinc waste and environmental pollution, and achieve the effect of effective recovery

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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