Recovery liquid for ion exchange resin polluted by iron

Abstract

The invention discloses recovery liquid for ion exchange resin polluted by iron, which comprises the following materials by weight percent: 20-30 percent of acid substance, 10-20 percent of inorganic salt, 40-50 percent of reducing agent and 10-20 percent of disodium ethylene diamine tetraacetate (EDTA). In the material components, the acid substance is hydrochloric acid; the inorganic salt is sodium chloride; the reducing agent is hydroxylamine hydrochloride, orthophenanthroline or a mixture of the hydroxylamine hydrochloride and the orthophenanthroline; and the complexing agent is EDTA or sodium salt thereof. The recovery liquid has the advantages of little stimulation to a human body, good recovery effect, and the like and can effectively carry out recovery to the iron pollution of the resin.

Description

technical field [0001] The invention relates to a resuscitation fluid, in particular to a resuscitation fluid in which a cation exchange resin used in an ion exchanger is contaminated with iron. Background technique [0002] The ion exchange desalination system widely used in water treatment of power plants, namely cation exchange - anion exchange - mixed ion exchange, ion exchange resin (resin for short) is the key working medium in this water purification system, which determines the water quality of the desalination system and operating cycle. During the use of the resin, there may be many problems such as the deterioration of the effluent quality, the decrease of the working exchange capacity, and the shortening of the operation period. The common reason for the above problems is that the resin is polluted by harmful impurities (such as iron compounds, organic substances), and resin "poisoning" accidents occur, and resin poisoning is the most common phenomenon of iron "...

AI Technical Summary

Problems solved by technology

Hydrochloric acid resuscitation is effective for mild iron pollution (such as pollution rate below 10%), but for heavily polluted resins to be fully resuscitated, the concentration of hydrochloric acid must be increased to more than 10%, which increases the cost and is easy to damage The exchanged inner anti-corrosion layer; sodium sulfite is added to the resuscitation solution of the reduction resuscitation method, but in actual production, sodium sulfite can react with hydrochloric acid to generate a large amount of sulfur dioxide gas, which not only causes pollution but also has strong harm to the human body

[0004] Because the above methods can cause harm to the human body and equipment, it is necessary to develop a newer resuscitation method to deal with resin iron pollution, which can not only meet the resuscitation effect, but also not cause harm to the operator's health and equipment