CN-121976041-A - Application of N-alkyl imidazole anion exchange resin in adsorption separation of vanadium and/or tungsten

Abstract

The invention relates to the technical field of nonferrous metal recovery, and provides application of N-alkyl imidazole anion exchange resin in adsorption separation of vanadium and/or tungsten. The invention adopts the N-alkyl imidazole anion exchange resin as the adsorbent to adsorb and separate vanadate and/or tungstate in the solution, the N-alkyl imidazole anion exchange resin has good adsorption performance, good cycle performance and high stability on vanadate and tungstate, the applicable pH value range is wide, and the high-efficiency separation of vanadium and tungsten can be realized through desorption. Meanwhile, the method utilizes the N-alkyl imidazole anion exchange resin to recycle vanadium and/or tungsten in the waste SCR catalyst eluent, has good separation and recycling effects, is simple and convenient to operate, and is convenient for industrial application.

Inventors

• SONG YANHUA
• WU JIANRUI
• WANG TONG
• ZHANG ZUZHUO
• ZOU HAIFENG
• LI ZHONGLIANG

Assignees

• 吉林大学

Dates

Publication Date

20260505

Application Date

20260116

Claims (10)

1. The use of an N-alkyl imidazole anion exchange resin for the adsorptive separation of vanadium and/or tungsten, wherein the N-alkyl imidazole anion exchange resin has a structure according to formula I: A formula I; in the formula I, X is Cl - or OH - , and m is 0-5.
2. 2. A method for recovering vanadium and/or tungsten from a spent SCR catalyst eluate, comprising the steps of: Adding N-alkyl imidazole anion exchange resin into a waste SCR catalyst eluent containing vanadium and/or tungsten for adsorption, wherein the N-alkyl imidazole anion exchange resin has a structure shown in a formula I: A formula I; in the formula I, X is Cl - or OH - , and m is 0-5.
3. 3. The method of claim 2, wherein the solid to liquid ratio of the N-alkyl imidazole anion exchange resin to the spent SCR catalyst eluent is 0.05-20 g/L.
4. 4. The method according to claim 2, wherein the temperature of adsorption is 20-80 ℃ for 2-12 hours.
5. 5. The method of claim 2, wherein the pH of the adsorption is 1-14.
6. 6. The method of claim 2, wherein the adsorption is performed under shaking conditions.
7. 7. The method of claim 2, further comprising desorbing the resulting adsorbent resin after adsorption is complete.
8. 8. The method of claim 7, wherein the desorbing agent used in desorbing vanadium from the adsorbent resin is hydrochloric acid.
9. 9. The method of claim 7, wherein the desorbing agent used in desorbing tungsten from the adsorbent resin is sodium hydroxide solution.
10. 10. The method of claim 7, further comprising regenerating the desorbed resin after the desorbing is completed, wherein the regenerant used for the regenerating is a sodium chloride solution.

Description

Application of N-alkyl imidazole anion exchange resin in adsorption separation of vanadium and/or tungsten Technical Field The invention relates to the technical field of nonferrous metal recovery, in particular to application of N-alkyl imidazole anion exchange resin in adsorption separation of vanadium and/or tungsten. Background A Selective Catalytic Reduction (SCR) catalyst is a key environmental protection technology for reducing emission of nitrogen oxides (NO x), and is widely applied to the fields of diesel vehicle exhaust, coal-fired power plants, industrial boilers, ships, gas turbines and the like. The core principle is that a catalyst is utilized to promote the selective reaction of a reducing agent (such as ammonia or urea) and NO x to generate harmless nitrogen and water. The vanadium-titanium-based SCR catalyst (V 2O5-WO3(MoO3)/TiO2) becomes the flue gas denitration catalyst with the most wide application, the most mature technology and the highest efficiency due to the advantages of high denitration efficiency, good selectivity, stable and reliable operation and the like. However, in practical application, the SCR catalyst is affected by complex smoke components and coal components, and poisoning phenomena such as alkali metal, alkaline earth metal, heavy metal and the like are generated, so that the catalyst is deactivated, and the denitration efficiency is reduced. For the poisoning catalyst, a method of combining alkali washing and acid washing is often adopted to remove poisoning elements, so that the catalyst is regenerated. However, in the regeneration process, the active ingredients such as vanadium, tungsten and the like are eluted. The vanadium (V) and tungsten (W) are not only main components of the SCR catalyst, but also can be widely applied to the aspects of chemical industry, aerospace, electronics and the like, such as recycling the nonferrous metals in the eluent, can realize recycling of resources while reducing environmental pollution, and has important practical significance. At present, the common ion recovery methods mainly comprise methods of chemical precipitation, solvent extraction, adsorption, membrane filtration, microorganism restoration and the like, wherein the adsorption method is simple to operate, the raw materials are cheap and easy to obtain, and the application is most extensive. However, the adsorption capacity of the adsorbent used in the current adsorption method on vanadium and tungsten is still poor, and the cycle stability is poor, so that the requirement of industrial recovery is difficult to meet. Disclosure of Invention In view of this, the present invention provides the use of N-alkylimidazole anion exchange resins for the adsorptive separation of vanadium and/or tungsten. The invention utilizes the N-alkyl imidazole anion exchange resin to adsorb and separate vanadium and/or tungsten, has strong adsorption capacity to vanadium and/or tungsten, good cycle performance and high stability, and has wide applicable pH range and wide application prospect. In order to achieve the above object, the present invention provides the following technical solutions: the application of N-alkyl imidazole anion exchange resin in adsorption separation of vanadium and/or tungsten, the N-alkyl imidazole anion exchange resin has a structure shown in a formula I: A formula I; in the formula I, X is Cl - or OH -, and m is 0-5. The invention also provides a method for recovering vanadium and/or tungsten from a spent SCR catalyst eluate, comprising the steps of: Adding N-alkyl imidazole anion exchange resin into a waste SCR catalyst eluent containing vanadium and/or tungsten for adsorption, wherein the N-alkyl imidazole anion exchange resin has a structure shown in a formula I: A formula I; in the formula I, X is Cl - or OH -, and m is 0-5. Preferably, the solid-to-liquid ratio of the N-alkyl imidazole anion exchange resin to the waste SCR catalyst eluent is 0.05-20 g/L. Preferably, the adsorption temperature is 20-80 ℃ and the adsorption time is 2-12 hours. Preferably, the pH value of the adsorption is 1-14. Preferably, the adsorption is performed under shaking conditions. Preferably, after the adsorption is completed, the desorption of the obtained adsorption resin is further included. Preferably, the desorbing agent used in desorbing vanadium in the adsorbent resin is hydrochloric acid. Preferably, the desorber used in desorbing tungsten from the adsorbent resin is sodium hydroxide solution. Preferably, after the desorption is completed, the method further comprises the step of regenerating the desorbed resin, wherein a regenerant adopted for regeneration is sodium chloride solution. The invention provides application of N-alkyl imidazole anion exchange resin in adsorption separation of vanadium and/or tungsten, wherein the N-alkyl imidazole anion exchange resin has a structure shown in a formula I. The invention adopts N-alkyl imidazole anion exchange resins with diff