Chelate resin tower regeneration prolongation process method

Abstract

The present invention discloses a chelate resin tower regeneration prolongation process method comprising the following steps: step 1, first crude saline is added with high purity phosphoric acid for precipitation processing; step 2, the processed first crude saline is filtered; and step 3, the filtrate after filtering in the step2 is introduced into a chelate resin tower for adsorption. The chelate resin tower regeneration prolongation process method well solves the problem of frequent regeneration of the chelate resin tower, greatly extends the resin tower regeneration cycle, reduces labor intensity, saves material and power required for regeneration, reduces waste water efflux, and reduces the amount of wastewater reused in the saline process to achieve the increase in the amount of brine dosage.

Description

Technical field [0001] The invention belongs to the technical field of extending the regeneration of a chelating resin tower, and specifically relates to a process method for extending the regeneration of a chelating resin tower. Background technique [0002] The highly selective ion exchange membrane used in the ion-exchange membrane electrolyzer requires that the calcium and magnesium ion content of the brine into the tank is less than 20ppb. The ordinary chemical refining method can only reduce the calcium and magnesium ion content in the brine to about 10ppm. If the calcium and magnesium ion content is reduced to 20ppb, it must be treated with chelating resin. The chelating resin runs for a period of time, and the exchange capacity is close to saturation, and resin regeneration must be carried out to restore the exchange capacity. Otherwise, the resin cannot effectively reduce the calcium and magnesium ion content in the brine. [0003] At present, there are three sets of chel...

AI Technical Summary

Problems solved by technology

The chelating resin runs for a period of time, and the exchange capacity is close to saturation, and the resin must be regenerated to restore the exchange capacity, otherwise, the resin cannot effectively reduce the content of calcium and magnesium ions in the brine

[0003] At present, there are three sets of chelating resin tower regeneration devices, and the amount of waste water generated by each regeneration is about 257m 3 , which are mainly acid wastewater and trace heavy metal ions; regeneration requires 250m 3 About pure water and 60m 3 Regenerated brine, causing a lot of waste of water resources and material loss

Ca in primary brine 2+ +Mg 2+ At about 700ppb, when entering the resin towers under such conditions, one of the resin towers needs to be regenerated once a day, and the other resin towers are regenerated in turn according to the order of the towers, 30 to 31 times per month, wasting a lot of high-purity water, high Pure acid, ionic membrane caustic soda, etc., while increasing the workload of ionic caustic soda regeneration, the consumption and workload of manufacturing high-purity water, and the cost and workload of environmental protection treatment

[0004] All of the above will bring greater environmental pressure and economic losses to the company