On-line recovery method for ion exchange resin

Abstract

An on-line recovery method for ion exchange resin is preformed in an ion exchange reactor and comprises the following steps: employing desalinized water to perform one-time washing on inactive ion exchange resin, wherein the one-time washing comprises alternative backwashing and forward washing and the water inflow velocity of backwashing is larger than the water inflow velocity of the forward washing; immersing ion exchange resin subjected to one-time washing with an acidic solution; immersing ion exchange resin with a mixed recovery solution composed of a Na2SO4 solution with a mass concentration of 10-12% and a NaOH solution with a mass concentration of 5-6%, and continuously introducing O3 into the ion exchange reactor when immersing; and performing regeneration on ion exchange resin by employing a NaOH solution or a KOH solution. By employing the on-line recovery method for ion exchange resin to perform on-line recovery on inactive resin, resin is used again after majority functions of the resin are recovered, so that the recovery cost is reduced, the service life of ion exchange resin is prolonged, and energy saving, emission reduction, cost reduction and effect improvement are facilitated.

Description

technical field [0001] The invention relates to the technical field of ion exchange purification, and more specifically, relates to an ion exchange resin online recovery method in an ion exchange resin desalination system in an organic amine flue gas desulfurization process. Background technique [0002] The iron and steel industry is one of the industries that cause serious air pollution, and the sintering process is the main source of pollution in the iron and steel industry. In recent years, more and more sinter plants have installed flue gas desulfurization systems to reduce SO emissions 2 , part of which adopts the wet organic amine desulfurization process. Organic amine solution is absorbing SO 2 At the same time, it also absorbs a large amount of SO 3 And acid gases such as HCl, these absorbed acid gases quickly form SO in the desulfurization solution 4 2- and Cl - and other anions. On the one hand, the formed anions will affect the absorption and analysis perf...

AI Technical Summary

Problems solved by technology

However, since the content of iron, calcium, aluminum and other metal ions, suspended solids, silicon, oil, and organic matter in the organic amine desulfurization solution is much higher than the content of similar substances in the water to be treated in the traditional water treatment process, it is easy to quickly cause Contamination of the resin fails, so frequent resuscitation is required

However, the offline recovery method cannot meet the requirements of industrial production due to its poor operability and long time consumption.

In addition, the resuscitation of ion exchange resins in the prior art is mostly carried out outside the ion exchanger, which is easy to cause wear and pulverization of the resin during the process of moving the resin, and most of the resuscitation fluids used are strong acid and strong alkali, and the cost of resuscitation is relatively high

If there is an online resuscitation process, the resuscitation effect is usually limited due to problems such as the resuscitation agent, and it is difficult to greatly improve and improve the performance of the old resin

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