Restoration method for removing iron pollution of anion exchange resin and restoration drug formula

An exchange resin and anion technology, applied in ion exchange, ion exchange regeneration, chemical instruments and methods, etc., can solve the problems of corrosion of anion exchange resin tanks and poor recovery effect, and achieve the effect of improving iron removal efficiency.

Active Publication Date: 2014-04-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem that the existing concentrated hydrochloric acid soaked anion exchange resin has poor resuscitation effect and the original resuscitation formula corrodes the anion exchange resin tank, and provides a resuscitation method for removing iron pollution of anion exchange resin and Resuscitation Potion Recipe

Method used

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specific Embodiment approach 1

[0011] Specific embodiment one: a kind of recovery method that removes anion exchange resin iron pollution in this embodiment is carried out according to the following steps:

[0012] 1. Transformation of anion exchange resin: Circular soaking of anion exchange resin with salt water with a concentration of 8% to 10% by weight at a temperature of 18 to 22°C and a circulation velocity of 2 to 3m / h, adopting the method of top in and bottom out Circulation, after 6-10 hours of circulation soaking, the transformation is completed. 2. Flushing: After the transformation is completed, the waste liquid is drained, and the anion exchange resin is reversely flushed with desalted water. The flushing time is 1.5-2.5 hours, and the flushing flow rate is 18-22m / h. 3. Remove the iron contamination of the anion exchange resin and resuscitate it: set up a medicine box and a circulating pump, inject the resuscitating agent into the anion exchange resin tank for circular elution. The total volum...

specific Embodiment approach 2

[0017] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the anion exchange resin is transformed into an anion exchange resin with a concentration of 8.5% to 9.5% by weight. ℃, the circulation flow rate is 2.2-2.8m / h, and the circulation is adopted in the way of top-in and bottom-out, and the cycle soaking time is 7-9 hours. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0018] Specific embodiment three: the difference between this embodiment and specific embodiment one is that in step one, the anion exchange resin is transformed into an anion exchange resin with a weight percent concentration of 9% saline to circulate and soak the anion exchange resin at a temperature of 20°C and a circulation flow rate of 2.5m / h, using the top-in and bottom-out circulation, and the cycle soaking time is 8 hours. Other steps and parameters are the same as in the first embodiment.

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Abstract

The invention discloses a restoration method for removing iron pollution of an anion exchange resin and a restoration drug formula, which can be used for solving the problem that the environment is polluted and an anion exchange resin tank is corroded because the use of sodium sulfite and concentrated hydrochloric acid in the original restoration formula and restoration drug formula of the anion exchange resin can cause toxic gas SO2. The restoration method comprises the following steps: 1. transforming the anion resin; 2. washing; 3. removing the iron pollution of the anion resin to lead the anion resin to restore; 4. washing; and 5. regenerating. The restoration drug formula consists of hydrochloric acid, sodium chloride, hydroxylamine hydrochloride and water, wherein the weight percent of the above components in water are as follows: 2-6% of hydrochloric acid, 4-8% of sodium chloride and 1-5% of hydroxylamine hydrochloride. The restoration method is suitable for restoration of the iron pollution of the anion resin and is effective in removing the iron pollution of a cation resin.

Description

technical field [0001] The invention relates to a resuscitation method for removing iron pollution of anion exchange resins and a resuscitation agent formula. Background technique [0002] Iron pollutes the surface of the anion exchange resin in two forms: first, it covers the surface of the anion exchange resin; second, it deposits in the pores of the anion exchange resin. Due to the high iron content of the regenerated lye or improper operation, iron exists in the form of complexes and oxides, and its volume is relatively large compared to the pores of the anion exchange resin. It is deposited and then covered on the surface of its particles. After the anion exchange resin is polluted, the color turns brown or even black, and the exchange capacity drops sharply. At present, the phenomenon of "iron poisoning" commonly exists in the anion exchange resin used to reduce the hardness of feed water in industrial boilers. The removal of iron from anion exchange resins is calle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J49/00B01J49/57
Inventor 李伟光刘景辰
Owner HARBIN INST OF TECH
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