CN-121972153-A - Saturated capacity recovery method of resin for removing ammonia nitrogen and chloride from cobalt carbonate wastewater

Abstract

The invention discloses a method for recovering saturated capacity of resin for removing ammonia nitrogen and chloride from cobalt carbonate wastewater, which solves the problems of reduced saturated capacity and shortened service life of resin in the field of ion exchange resins. The method comprises the steps of firstly utilizing ammonia water to analyze the ammonia-nitrogen-removed saturated adsorption cationic resin, thoroughly analyzing anions adsorbed in the cationic resin, then utilizing pure water to wash, utilizing hydrochloric acid to analyze ammonia nitrogen adsorbed on the cationic resin, finally utilizing pure water to wash, firstly utilizing hydrochloric acid to analyze the chloride-removed saturated adsorption anionic resin, thoroughly analyzing cations adsorbed in the anionic resin, then utilizing pure water to wash, utilizing ammonia water to analyze chloride ions adsorbed on the anionic resin, and finally utilizing pure water to wash. The invention solves the problem of incomplete analysis in the traditional method, and the saturated capacity recovery rate of the resin reaches 95% through periodical backwashing and regeneration, thereby obviously prolonging the service life of the resin.

Inventors

• CHEN QIN
• ZHANG CHAO
• ZHANG ZHICHENG
• Ren Xianhai
• ZHANG FUMING

Assignees

• 金川集团镍钴股份有限公司
• 兰州金川新材料科技股份有限公司

Dates

Publication Date

20260505

Application Date

20260212

Claims (4)

1. 1. A saturated capacity recovery method of resin for removing ammonia nitrogen and chlorine from cobalt carbonate wastewater is characterized by comprising the following steps: the method comprises the steps of resolving ammonia water to remove ammonia nitrogen adsorption saturated cationic resin, fully soaking to thoroughly resolve anions adsorbed in the cationic resin, then flushing the cationic resin by pure water until the pH value of effluent reaches 7, resolving ammonia nitrogen adsorbed on the cationic resin by hydrochloric acid to fully soak, and finally flushing the cationic resin by pure water until the pH value of effluent reaches 7; The method comprises the steps of firstly resolving chloride-removing adsorption saturated anion resin by using hydrochloric acid, fully soaking to thoroughly resolve cations adsorbed in the anion resin, then flushing the anion resin by using pure water until the pH value of effluent reaches 7, resolving chloride ions adsorbed on the anion resin by using ammonia water, fully soaking, and finally flushing the anion resin by using pure water until the pH value of the effluent reaches 7.
2. 2. The method for recovering saturated capacity of resin for removing ammonia nitrogen and chlorine from cobalt carbonate wastewater according to claim 1, wherein the mass fraction of ammonia water used is 6-8%, and the mass fraction of hydrochloric acid used is 6-8%.
3. 3. The method for recovering saturated capacity of resin for removing ammonia nitrogen and chlorine from cobalt carbonate wastewater according to claim 1 or 2, wherein the amount of ammonia water and hydrochloric acid used is not less than 3 times of the volume of the resin in each analysis.
4. 4. The method for recovering saturated capacity of resin for removing ammonia nitrogen and chlorine from cobalt carbonate wastewater according to claim 1 or 2, wherein the soaking time is not less than 4 hours at each time of the analysis.

Description

Saturated capacity recovery method of resin for removing ammonia nitrogen and chloride from cobalt carbonate wastewater Technical Field The invention belongs to the field of ion exchange resins, and particularly relates to a saturated capacity recovery method of a resin for removing ammonia nitrogen and chlorine from cobalt carbonate wastewater. Background When the cobalt carbonate wastewater is recycled, condensed water generated by MVR evaporation contains ammonia nitrogen, chloride ions, and trace calcium, magnesium, sodium and cobalt ions. And (3) carrying out primary ammonia nitrogen removal on the condensed water by utilizing the cationic ammonia nitrogen removal resin, and carrying out secondary chlorine removal and conductivity reduction on the primary effluent by utilizing the anionic resin. A large number of experiments show that the cationic resin also adsorbs cobalt ions, magnesium ions, sodium ions, calcium ions and a small amount of chloride ions in condensed water when adsorbing ammonia nitrogen, and the anionic resin also adsorbs cobalt ions, calcium ions, magnesium ions, sodium ions and the like when removing chloride. In general, after the first-stage ammonia nitrogen-removing cationic resin is saturated, the resin is backwashed by hydrochloric acid, that is, ammonia ions, cobalt ions, calcium ions, magnesium ions and sodium ions adsorbed on the cationic resin are resolved by hydrogen ions, while the chlorine ions adsorbed on the resin cannot be resolved by hydrochloric acid, and after the second-stage chlorine ion-removing anionic resin is saturated, the resin is backwashed by ammonia water, only the chlorine ions adsorbed in the resin cannot be resolved, and the cations adsorbed in the resin can not be resolved. Therefore, as the use time and the amount of excess water increase, the more these ions are adsorbed in the resin, the adsorption rate of the resin decreases rapidly, the saturation capacity decreases simultaneously, the backwash regeneration frequency increases, and the service life of the resin decreases rapidly. In order to recover the saturated capacity of the resin and improve the service life of the resin, the invention optimizes and innovates the resin backwashing technology for removing ammonia nitrogen and chlorine and reducing conductivity. Disclosure of Invention The invention aims to provide a method for recovering saturated capacity of resin for removing ammonia nitrogen and chlorine from cobalt carbonate wastewater, which aims to solve the problems of reduced saturated capacity and shortened service life of the resin. The technical scheme of the invention is that the saturated capacity recovery method of the resin for removing ammonia nitrogen and chlorine from cobalt carbonate wastewater comprises the following steps: For the first-stage ammonia nitrogen removal saturated cationic resin, ammonia water is utilized to analyze and fully soak the cationic resin, so that anions (chloride ions) adsorbed in the cationic resin are thoroughly analyzed, then pure water is utilized to wash the cationic resin until the pH value of effluent reaches 7, hydrochloric acid is utilized to analyze and adsorb ammonia nitrogen on the cationic resin, and the full soak is carried out; The method comprises the steps of firstly resolving the secondary chloride removal adsorption saturated anion resin by using hydrochloric acid, fully soaking to thoroughly resolve cations (cobalt ions, calcium ions, magnesium ions, sodium ions and ammonia ions) adsorbed in the anion resin, then flushing the anion resin by using pure water until the pH value of effluent reaches 7, then resolving the chloride ions adsorbed on the anion resin by using ammonia water, fully soaking, and finally flushing the anion resin by using pure water until the pH value of the effluent reaches 7. As a further improvement of the invention, the mass fraction of the ammonia water is 6-8%, and the mass fraction of the hydrochloric acid is 6-8%. As a further improvement of the invention, the usage amount of ammonia water and hydrochloric acid is not less than 3 times of the volume of the resin when each analysis is carried out. As a further improvement of the invention, the soaking time is not less than 4 hours at each time of analysis. The invention has the advantages that the invention is improved on the basis of the traditional backwashing technology, firstly ammonia water is used for soaking the cationic resin with saturated adsorption of primary ammonia nitrogen, so that anions (chloride ions) adsorbed in the cationic resin are thoroughly resolved, then hydrochloric acid is used for resolving ammonia nitrogen adsorbed on the cationic resin, secondly the anionic resin with saturated adsorption of secondary chloride ions is firstly soaked with hydrochloric acid, cations (cobalt ions, calcium ions, magnesium ions, sodium ions and ammonia ions) adsorbed in the anionic resin are thoroughly resolved, and then ammonia water is used