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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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

Method used

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  • Recovery process for waste zinc ions in viscose production
  • Recovery process for waste zinc ions in viscose production

Examples

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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...

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 t...

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 ado...

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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.

Description

technical field [0001] The invention relates to the recovery of waste heavy metal ions in viscose production, in particular to a recovery process of waste zinc ions in viscose fiber production. Background technique [0002] In the production process of viscose fiber, viscose is regenerated into viscose fiber through an acid bath composed of sulfuric acid, zinc sulfate, and sodium sulfate in a certain proportion. After the viscose fiber is formed, the acid bath adhered to the viscose fiber is washed with water. And impurities, sulfuric acid, zinc sulfate, sodium sulfate and other impurities are lost into the wastewater, making the zinc ion content in the wastewater as high as about 500mg / L. In order to reduce the concentration of zinc ions in the wastewater, the existing technical solution is to add lime powder and sodium hydroxide to the wastewater to adjust the pH value of the wastewater to 6.5-8.5, so that the zinc ions are converted into zinc hydroxide and precipitated, s...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F9/04C02F101/20
CPCC02F1/001C02F1/66C02F9/00C02F11/00C02F2001/425C02F2101/20C02F2303/10C02F2303/16
Inventor 唐金钟贺敏范贤珍柳永权邓海燕
Owner YIBIN HIEST FIBER
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