A resin pretreatment method

Abstract

The application discloses a resin pretreatment method and relates to the chemical field. The method comprises the following steps: filling a to-be-tested resin into a container with a height-diameter ratio of (1.5-4):1, washing the resin with water to obtain a first resin; if the type of the to-be-treated resin is strong alkaline anion resin, sequentially performing acid washing, alkali washing and water washing on the first resin to obtain a pretreated resin; if the type of the to-be-treated resin is strong acid cation resin, sequentially performing alkali washing, acid washing and water washing on the first resin to obtain the pretreated resin; and if the type of the to-be-treated resin is adsorption resin, performing salt washing, acid washing and alkali washing on the first resin to obtain the pretreated resin. After washing with water in the container with the height-diameter ratio of (1.5-4):1, according to the type of the resin, a suitable treatment mode is selected, the carrying of residues in the resin is reduced, the pollution of the residues to water in the treatment water is reduced, the water quality of the resin treatment water is improved, and higher requirements are met.

Description

Technical Field

[0001] This application relates to the field of chemical technology, and in particular to a method for resin pretreatment. Background Technology

[0002] Economic development has placed higher demands on water quality. Industries such as semiconductors, integrated circuits, photovoltaics, power generation, and pharmaceuticals are experiencing a surge in demand for ultrapure water and electronic-grade ultrapure water. Space stations and ships also have significant needs for reclaimed water and drinking water treatment. These sectors rely heavily on water treatment materials to meet their high-quality water requirements. Ion exchange resins and adsorption resins are widely used in high-quality water treatment. Ion exchange resins, including cation exchange resins and anion exchange resins, are generally used for the preparation of deionized water and electronic-grade ultrapure water because they can remove ions from water. Adsorption resins are generally used to remove organic pollutants from water and have numerous applications in industrial wastewater treatment, resource recovery, and reclaimed water preparation.

[0003] However, existing resins have the problem of continuous and long-term release of residues during the pretreatment process, which in turn affects water quality. Summary of the Invention

[0004] This application provides a resin pretreatment method to solve the problem of continuous and long-term release of residues.

[0005] In a first aspect, this application provides a resin pretreatment method, comprising the following steps:

[0006] The resin to be tested was filled into a container with a height-to-diameter ratio of (1.5 to 4):1, washed with water, and the first resin was obtained.

[0007] If the type of resin to be treated is basic anion exchange resin, then the first resin is sequentially acid-washed, alkali-washed, and water-washed to obtain the pretreated resin.

[0008] If the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin.

[0009] If the type of resin to be treated is an adsorption resin, then the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin.

[0010] In this application, after washing with water using a container with a height-to-diameter ratio of (1.5 to 4):1, a suitable treatment method is selected based on the type of resin. This can reduce the carryover of residues in the resin, minimize water pollution from residues during treatment, improve the water quality of the resin-treated water, and meet higher requirements. It should be noted that the height-to-diameter ratio of the treatment container will affect the contact state between the cleaning solution and the resin particles, thus affecting the resin cleaning effect.

[0011] In some embodiments, before filling the resin to be tested into a container with a height-to-diameter ratio of (1.5–4):1, washing with water, and obtaining the first resin, the method further includes:

[0012] The resin to be tested was washed with water, filled into a cleaning container, cleaned with organic solvent, and then subjected to steam stripping.

[0013] Most water-soluble and fat-soluble residues in the resin can be removed by washing with water, cleaning with organic solvents, and steam stripping, thus reducing the amount of impurities remaining in the resin.

[0014] In some embodiments, the number of water washes is 3 to 10. The more times the water is washed, the better the removal effect of impurities. Within this range, the number of water washes can reduce the residue of water-soluble impurities in the resin; and / or,

[0015] The height-to-diameter ratio of the cleaning container is (1-2):1. Within this range, better cleaning can be achieved.

[0016] In some embodiments, the organic solvent includes at least one selected from methanol, ethanol, acetone, and toluene. Using at least one of these organic solvents can effectively remove residual organic matter from the resin, thereby reducing the concentration of organic leachates in the resin; and / or,

[0017] When cleaning with organic solvents, the volume ratio of organic solvent to the resin to be tested is (1.5–10):1. Within this range, the optimal balance between cost and effectiveness can be achieved, enabling resin treatment at a low cost; and / or,

[0018] The flow rate of the organic solvent is 0.5 to 2 BV / h (bed volume / hour). Within this range, the resin can be cleaned with a relatively small consumption.

[0019] In some embodiments, the steam temperature is 100–160°C. Within this temperature range, most volatile residues can be removed, reducing impurities remaining in the resin; and / or,

[0020] The steam stripping time is 30 to 600 minutes. Within this range, most of the volatile residues can be removed, reducing the amount of impurities remaining in the resin.

[0021] In some embodiments, the resin to be tested is filled into a container with a height-to-diameter ratio of (1.5–4):1, washed with water, to obtain a first resin:

[0022] During washing, the volume ratio of water to the resin being tested is (2–10):1. Within this range, the resin can be treated to a clean state; and / or,

[0023] During water washing, the water flow rate is 2-5 BV / h. Within this range, the resin can be cleaned.

[0024] In some embodiments, if the type of resin to be treated is an alkaline anion exchange resin, the first resin is sequentially subjected to acid washing, alkali washing, and water washing to obtain a pretreated resin in which:

[0025] The acid includes at least one of HCl and H2SO4. Acid washing with at least one of these acids can effectively remove metallic impurities from the resin; and / or,

[0026] The molar concentration of the acid is 0.5–4 mol / L. Within this range, the pretreatment of the resin and the removal of metallic impurities can be effectively achieved; and / or,

[0027] During pickling, the volume ratio of acid to the first resin is (1-5):1. Within this range, metal impurities can be removed at a controllable cost; and / or,

[0028] The alkali includes at least one of NaOH and KOH. Acid washing with at least one of the above-mentioned alkalis can remove some organic impurities; and / or,

[0029] The molar concentration of the alkali is 0.5–5 mol / L. Within this range, the reduction of organic leachates from the resin can be achieved within a controllable cost range; and / or,

[0030] During alkaline washing, the volume ratio of alkaline solution to the first resin is (5-50):1. Within this range, the reduction of organic leachates from the resin can be achieved within a controllable cost range; and / or,

[0031] The conductivity of the water used for washing is 0.055–2 μS / cm. This conductivity range ensures the effective cleaning of the resin; and / or,

[0032] During water washing, the volume ratio of water to the first resin is (50~500):1. Within this range, the cleaning effect of the resin can be guaranteed within a controllable cost range.

[0033] In some embodiments, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in which:

[0034] The alkali includes at least one of NaOH and KOH. Alkali washing with at least one of these alkalis can further reduce the residual impurities in the resin; and / or,

[0035] The molar concentration of the alkali is 0.1–2 mol / L. Within this range, the residual organic matter in the resin can be effectively controlled; and / or,

[0036] During alkaline washing, the volume ratio of alkaline solution to the first resin is (2-5):1. Within this range, the residual organic matter in the resin can be effectively controlled within a cost-effective context; and / or,

[0037] The acid includes at least one of HCl and H2SO4. Acid washing with at least one of these acids can effectively remove metallic impurities from the resin; and / or,

[0038] The molar concentration of the acid is 1–5 mol / L. Within this range, the acid can effectively remove metallic impurities from the resin; and / or,

[0039] During pickling, the volume ratio of acid solution to the first resin is (5-50):1. Within this range, the content of metallic impurities in the resin can be effectively removed within a controllable cost. And / or,

[0040] During washing, the conductivity of the water is 0.055–5 μS / cm. Within this range, the water effectively removes residual acids, alkalis, organic matter, and metallic impurities from the resin; and / or,

[0041] During water washing, the volume ratio of water to the first resin is (10-200):1. Within this range, residual acids, alkalis, organic matter, and metal impurities in the resin can be effectively removed within a controllable cost range.

[0042] In some embodiments, if the type of resin to be treated is an adsorption resin, then the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin.

[0043] The salt includes at least one of Na₂SO₄ and NaCl. Using at least one of the above salts can remove some of the metallic impurities from the resin; and / or,

[0044] During salt washing, the salt content in the salt solution ranges from 1% to 20% by mass. Within this concentration range, some metallic impurities in the resin can be removed at a controllable cost; and / or,

[0045] During salt washing, the volume ratio of the salt solution to the first resin is (1–50):1. Within this range, some metallic impurities in the resin can be removed at a controllable cost; and / or,

[0046] The acid includes at least one of HCl and H₂SO₄. Acid washing with at least one of these acids can effectively remove metallic impurities from the resin; and / or,

[0047] The molar concentration of the acid is 1–5 mol / L. Within this range, the acid can effectively remove metallic impurities from the resin; and / or,

[0048] During pickling, the volume ratio of acid solution to the first resin is (1-50):1. Within this range, the metal impurities in the resin can be effectively removed while maintaining controllable costs; and / or,

[0049] The alkali includes at least one of NaOH and KOH. Acid washing with at least one of the above-mentioned alkalis can effectively remove organic impurities from the resin; and / or,

[0050] The molar concentration of the alkali is 0.1–2 mol / L. Within this range, the alkali can effectively remove organic impurities from the resin; and / or,

[0051] During alkaline washing, the volume ratio of alkaline solution to the first resin is (5~50):1. When the volume ratio of alkaline solution to the first resin is within this range, organic impurities in the resin can be effectively removed while keeping costs under control.

[0052] In some embodiments, if the type of resin to be treated is a basic anion exchange resin, then the first resin is sequentially subjected to acid washing, alkali washing, and water washing to obtain a pretreated resin in a carbon dioxide-free environment; and / or,

[0053] If the type of resin to be treated is an acidic cationic resin, then the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in a carbon dioxide-free environment; and / or,

[0054] If the type of resin to be treated is an adsorption resin, then the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in an environment isolated from carbon dioxide.

[0055] It should be noted that the environment that isolates carbon dioxide can be an inert gas atmosphere or air that has been decarbonated. Using a carbon dioxide-isolated environment can effectively reduce the content of carbonate, bicarbonate, and carbon dioxide in the resin. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0057] Economic development has placed higher demands on water quality. Industries such as semiconductors, integrated circuits, photovoltaics, power generation, and pharmaceuticals are experiencing a surge in demand for ultrapure water and electronic-grade ultrapure water. Space stations and ships also have significant needs for reclaimed water and drinking water treatment. These sectors rely heavily on water treatment materials to meet their high-quality water requirements. Ion exchange resins and adsorption resins are widely used in high-quality water treatment. Ion exchange resins, including cation exchange resins and anion exchange resins, are generally used for the preparation of deionized water and electronic-grade ultrapure water because they can remove ions from water. Adsorption resins are generally used to remove organic pollutants from water and have numerous applications in industrial wastewater treatment, resource recovery, and reclaimed water preparation.

[0058] However, ion exchange and adsorption resins are high-molecular chemical products. Their raw materials include monomers such as styrene, divinylbenzene, acrylates, methacrylates, and acrylonitrile. These monomers are suspended and polymerized into solid spherical particles in a dispersed phase of water and an organic dispersant. Sometimes, to form fixed channels within the polymer particles, various "pore-forming agents" that do not participate in the polymerization reaction, such as toluene, xylene, liquid wax, solvent oil, long-chain alkanes, and cycloalkanes, are used. These particles then undergo a series of reactions to prepare the final product. These reactions also utilize various raw materials such as sulfuric acid, sodium hydroxide, hydrochloric acid, gelatin, polyvinyl alcohol, sodium lignosulfonate, dimethylamine, trimethylamine, chloromethyl ether, zinc chloride, and ferric chloride. Therefore, it can be seen that the prepared ion exchange or adsorption resins inevitably contain residues of the above raw materials, oligomers, and heavy metals and organic matter introduced from the raw materials, processes, and equipment. To reduce the release of these residual contaminants during resin use, theoretically, this can be achieved through organic solvent extraction / washing, hot water washing, and acid / alkali treatment. Generally, water treatment applications only require 3 to 10 treatments of these steps to meet the requirements. However, for high-quality water, simple treatment is insufficient; incomplete treatment can even lead to the continuous and long-term release of residues, thus affecting the quality of the treated water.

[0059] In view of this, this application provides a resin pretreatment method to solve the problem of continuous and long-term release of residues.

[0060] In a first aspect, this application provides a resin pretreatment method, comprising the following steps:

[0061] The resin to be tested was filled into a container with a height-to-diameter ratio of (1.5 to 4):1, washed with water, and the first resin was obtained.

[0062] If the type of resin to be treated is basic anion exchange resin, then the first resin is sequentially acid-washed, alkali-washed, and water-washed to obtain the pretreated resin.

[0063] If the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin.

[0064] If the type of resin to be treated is an adsorption resin, then the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin.

[0065] In this application, after washing with water using a container with a height-to-diameter ratio of (1.5 to 4):1, a suitable treatment method is selected based on the type of resin. This can reduce the carryover of residues in the resin, minimize water pollution from residues during treatment, improve the water quality of the resin-treated water, and meet higher requirements. It should be noted that the height-to-diameter ratio of the treatment container affects the contact state between the liquid and the resin, thus impacting the cleaning effect of the resin.

[0066] In conjunction with the first aspect, in some embodiments provided in this application, before filling the resin to be tested into a container with a height-to-diameter ratio of (1.5 to 4):1, washing with water, and obtaining the first resin, the method further includes:

[0067] The resin to be tested was washed with water, filled into a cleaning container, cleaned with organic solvent, and then subjected to steam stripping.

[0068] Most water-soluble and fat-soluble residues in the resin can be removed by washing with water, cleaning with organic solvents, and steam stripping, thus reducing the amount of impurities remaining in the resin.

[0069] In conjunction with the first aspect, in some embodiments provided in this application, the number of water washes is 3 to 10. The more times the water is washed, the better the removal effect on impurities. Within this range, the number of water washes can reduce the residue of water-soluble impurities in the resin; and / or,

[0070] The height-to-diameter ratio of the cleaning container is (1-2):1. Within this range, the cleaning effect of the resin can be guaranteed under controllable conditions of cost and safety.

[0071] In conjunction with the first aspect, in some embodiments provided in this application, the organic solvent includes at least one of methanol, ethanol, acetone and toluene. Using at least one of the above organic solvents can effectively reduce the amount of organic matter leached from the resin.

[0072] In conjunction with the first aspect, in some embodiments provided in this application, during organic solvent cleaning, the volume ratio of organic solvent to the resin to be tested is (1.5 to 10):1. The volume ratio of organic solvent to the resin to be tested is within this range, which can reduce the organic leaching of resin under controllable cost conditions.

[0073] In conjunction with the first aspect, in some embodiments provided in this application, the flow rate of the organic solvent is 0.5 to 2 BV / h. The flow rate of the organic solvent within this range can reduce the amount of organic matter leached from the resin under cost-controllable conditions.

[0074] In conjunction with the first aspect, in some embodiments provided in this application, the temperature of the steam is 100 to 160°C. Within this temperature range, most volatile residues can be removed, reducing impurities remaining in the resin.

[0075] In conjunction with the first aspect, in some embodiments provided in this application, the steam stripping time is 30 to 600 minutes. Within this range, the steam stripping time can remove most of the volatile residues and reduce the amount of impurities remaining in the resin.

[0076] In conjunction with the first aspect, in some embodiments provided in this application, the resin to be tested is filled into a container with a height-to-diameter ratio of (1.5 to 4):1, and washed with water to obtain the first resin. During the water washing, the volume ratio of water to the resin to be tested is (2 to 10):1. The volume ratio of water to the resin to be tested is within this range, which can further remove organic and inorganic impurities from the water.

[0077] In conjunction with the first aspect, in some embodiments provided in this application, the resin to be tested is filled into a container with a height-to-diameter ratio of (1.5 to 4):1, and washed with water to obtain the first resin. During the water washing, the water flow rate is 2 to 5 BV / h. The water flow rate during the water washing is within this range, which can further remove organic and inorganic impurities from the water.

[0078] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an alkaline anion exchange resin, the first resin is sequentially subjected to acid washing, alkali washing, and water washing to obtain a pretreated resin in which the acid includes at least one of HCl and H2SO4. Acid washing with at least one of the above-mentioned acids can effectively remove metallic impurities from the resin.

[0079] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an alkaline anion exchange resin, the first resin is sequentially subjected to acid washing, alkali washing, and water washing to obtain a pretreated resin in which the molar concentration of acid is 0.5 to 4 mol / L. The molar concentration of acid within this range can effectively remove metal impurities from the resin under cost-controllable conditions.

[0080] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an alkaline anion exchange resin, the first resin is sequentially subjected to acid washing, alkali washing, and water washing to obtain a pretreated resin in which the volume ratio of acid solution to the first resin during acid washing is (1~5):1. The volume ratio of acid solution to the first resin during acid washing is within this range, which can effectively remove metal impurities in the resin under controllable cost conditions.

[0081] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an alkaline anion exchange resin, the first resin is sequentially subjected to acid washing, alkali washing, and water washing to obtain a pretreated resin in which the alkali includes at least one of NaOH and KOH. Using at least one of the above-mentioned alkalis for alkali washing can effectively remove organic impurities from the resin.

[0082] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an alkaline anion exchange resin, the first resin is sequentially subjected to acid washing, alkali washing, and water washing to obtain a pretreated resin in which the molar concentration of alkali is 0.5 to 5 mol / L. The molar concentration of alkali within this range can effectively remove organic impurities from the resin within a cost-controllable range.

[0083] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an alkaline anion exchange resin, the first resin is sequentially subjected to acid washing, alkali washing, and water washing to obtain a pretreated resin in which the volume ratio of alkali solution to the first resin during alkali washing is (5~50):1. The volume ratio of alkali solution to the first resin during alkali washing is within this range, which can effectively remove organic impurities in the resin within a controllable cost range.

[0084] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an alkaline anion exchange resin, the first resin is sequentially subjected to acid washing, alkali washing, and water washing to obtain a pretreated resin in which the conductivity of water during water washing is 0.055 to 2 μS / cm. The conductivity of water during water washing is within this range, which can further reduce various impurities in the resin.

[0085] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an alkaline anion exchange resin, the first resin is sequentially subjected to acid washing, alkali washing, and water washing to obtain a pretreated resin in which the volume ratio of water to the first resin during water washing is (50-500):1. The volume ratio of water to the first resin during water washing is within this range, which can further reduce various impurities in the resin within a controllable cost range.

[0086] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is a strong acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in which the alkali includes at least one of NaOH and KOH. Using at least one of the above-mentioned alkalis for alkali washing can effectively remove organic impurities from the resin.

[0087] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in which the molar concentration of alkali is 0.1 to 2 mol / L. The molar concentration of alkali within this range can effectively remove organic impurities from the resin within a cost-controllable range.

[0088] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in which the volume ratio of alkali solution to the first resin during alkali washing is (2-5):1. The volume ratio of alkali solution to the first resin during alkali washing is within this range, which can effectively remove organic impurities in the resin within a controllable cost range.

[0089] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in which the acid includes at least one of HCl and H2SO4. Acid washing with at least one of the above-mentioned acids can effectively remove metallic impurities from the resin.

[0090] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an acidic cation exchange resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in which the molar concentration of acid is 1 to 5 mol / L. The molar concentration of acid within this range can effectively remove metal impurities from the resin under cost-controllable conditions.

[0091] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in which the volume ratio of acid solution to the first resin during acid washing is (5~50):1. The volume ratio of acid solution to the first resin during acid washing is within this range, which can effectively remove metal impurities in the resin under controllable cost conditions.

[0092] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in which the conductivity of water during water washing is 0.055 to 5 μS / cm. The conductivity of water during water washing is within this range, which can further remove various impurities from the resin.

[0093] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in which the volume ratio of water to the first resin during water washing is (10-200):1. The volume ratio of water to the first resin during water washing is within this range, which can further remove various impurities in the resin under controllable cost conditions.

[0094] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an adsorption resin, then the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in which: the salt includes at least one of Na2SO4 and NaCl, and by using at least one of the above salts, some metals and organic impurities in the resin can be removed.

[0095] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in which: during salt washing, the mass percentage of salt in the salt solution is 1% to 20%, and the concentration of the salt solution during salt washing is within this range, which can effectively remove some metals and organic impurities from the resin.

[0096] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an adsorption resin, then the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in which the volume ratio of salt solution to first resin during salt washing is (1~50):1. The volume ratio of salt solution to first resin during salt washing is within this range, which can effectively remove some metals and organic impurities in the resin within a controllable cost range.

[0097] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an adsorption resin, then the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in which the acid includes at least one of HCl and H2SO4. Acid washing with at least one of the above-mentioned acids can effectively remove metal impurities from the resin.

[0098] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in which the molar concentration of acid is 1 to 5 mol / L. The molar concentration of acid within this range can effectively remove metal impurities from the resin within a cost-controllable range.

[0099] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an adsorption resin, then the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in which the volume ratio of acid solution to the first resin during acid washing is (1~50):1. The volume ratio of acid solution to the first resin during acid washing is within this range, which can effectively remove metal impurities in the resin within a controllable cost range.

[0100] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an adsorption resin, then the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in which: the alkali includes at least one of NaOH and KOH. Using at least one of the above-mentioned alkalis for alkali washing can effectively remove organic impurities from the resin.

[0101] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in which the molar concentration of alkali is 0.1 to 2 mol / L. The molar concentration of alkali within this range can effectively remove organic impurities from the resin.

[0102] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in which the volume ratio of alkali solution to the first resin during alkali washing is (5~50):1. The volume ratio of alkali solution to the first resin during alkali washing is within this range, which can effectively remove organic impurities in the resin while keeping costs under control.

[0103] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an alkaline anion exchange resin, the first resin is sequentially subjected to acid washing, alkali washing, and water washing to obtain a pre-treated resin in an environment isolated from carbon dioxide.

[0104] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an acidic cationic resin, the first resin is sequentially subjected to alkali washing, acid washing, and water washing to obtain a pretreated resin in a carbon dioxide-isolated environment.

[0105] In conjunction with the first aspect, in some embodiments provided in this application, if the type of resin to be treated is an adsorption resin, then the first resin is subjected to salt washing, acid washing, and alkali washing to obtain a pretreated resin in an environment isolated from carbon dioxide.

[0106] It should be noted that the environment that isolates carbon dioxide can be an inert gas atmosphere or air that has been decarbonated. Using a carbon dioxide-isolated environment can effectively reduce the content of carbonate, bicarbonate, and carbon dioxide in the resin.

[0107] The technical solution provided in this application will be described in detail below with reference to the embodiments. All operations in embodiments 1 to 15 are performed under a nitrogen atmosphere.

[0108] Example 1

[0109] Example 1 of this application provides a resin pretreatment method for a strong acid cation exchange resin, comprising the following steps:

[0110] After rinsing with water three times, the resin is packed into a reactor with a height-to-diameter ratio of 1:1. Methanol with a volume ratio of 4 times that of the resin is introduced into the fixed bed or reactor at a flow rate of 0.5 BV / h. The reactor is then purged with 100°C steam for 30 min. The resin is then packed into a fixed bed with a height-to-diameter ratio of 1.5:1 and rinsed with water with a volume ratio of 2 times that of the resin at a flow rate of 2 BV / h (bed volume / hour).

[0111] The resin was cleaned sequentially with NaOH aqueous solution, HCl aqueous solution, and pure water. The NaOH aqueous solution had a concentration of 0.1 mol / L and was used in an amount twice the volume of the resin. The HCl aqueous solution had a concentration of 1 mol / L and was used in an amount ten times the volume of the resin. The pure water had a conductivity of 0.1 μS / cm and was used in an amount twenty times the volume of the resin.

[0112] Example 2

[0113] Example 2 of this application provides a resin pretreatment method for a strong acid cation exchange resin, comprising the following steps:

[0114] After rinsing with water 5 times, the resin is packed into a fixed bed with a height-to-diameter ratio of 2:1. Acetone with a volume ratio of 1.5 times that of the resin is introduced into the fixed bed at a flow rate of 1 BV / h. The resin is then purged into the reactor with 100°C steam for 90 min. The resin is then packed into a fixed bed with a height-to-diameter ratio of 2:1 and rinsed with water at a flow rate of 3 BV / h (bed volume / hour) with a volume ratio of 5 times that of the resin.

[0115] The resin was cleaned sequentially using NaOH aqueous solution, HCl aqueous solution, and pure water. The NaOH aqueous solution had a concentration of 0.5 mol / L and was used in a volume ratio of 3 times the resin volume. The HCl aqueous solution had a concentration of 2 mol / L and was used in a volume ratio of 5 times the resin volume. Pure water had a conductivity of 0.055 μS / cm and was used in a volume ratio of 50 times the resin volume.

[0116] Example 3

[0117] Example 3 of this application provides a resin pretreatment method for a strong acid cation exchange resin, comprising the following steps:

[0118] After rinsing with water 8 times, the resin was packed into a reactor with a height-to-diameter ratio of 2:1. Ethanol with a volume ratio of 8 times that of the resin was introduced into the reactor at a flow rate of 1.5 BV / h. The reactor was then purged with steam at 120°C for 150 min. The resin was then packed into a fixed bed with a height-to-diameter ratio of 2:1 and rinsed with water with a volume ratio of 8 times that of the resin at a flow rate of 4 BV / h (bed volume / hour).

[0119] The resin was cleaned sequentially using NaOH aqueous solution, HCl aqueous solution, and pure water. The NaOH aqueous solution had a concentration of 1 mol / L and was used in a volume four times the resin volume. The HCl aqueous solution had a concentration of 4 mol / L and was used in a volume twenty times the resin volume. Pure water had a conductivity of 0.5 μS / cm and was also used in a volume twenty times the resin volume.

[0120] Example 4

[0121] Example 4 of this application provides a resin pretreatment method for a strong acid cation exchange resin, comprising the following steps:

[0122] After rinsing with water 10 times, the resin is packed into a fixed bed with a height-to-diameter ratio of 2:1. Methanol with a volume ratio of 10 times that of the resin is introduced into the fixed bed at a flow rate of 2 BV / h. The resin is then purged into the reactor with steam at 140°C for 180 min. The resin is then packed into a fixed bed with a height-to-diameter ratio of 2.5:1 and rinsed with water with a volume ratio of 10 times that of the resin at a flow rate of 5 BV / h (bed volume / hour).

[0123] The resin was cleaned sequentially using NaOH aqueous solution, HCl aqueous solution, and pure water. The NaOH aqueous solution had a concentration of 2 mol / L and was used in a volume 5 times the resin volume. The HCl aqueous solution had a concentration of 3 mol / L and was used in a volume 30 times the resin volume. Pure water had a conductivity of 1 μS / cm and was used in a volume 50 times the resin volume.

[0124] Example 5

[0125] Example 5 of this application provides a resin pretreatment method for a strong acid cation exchange resin, comprising the following steps:

[0126] After rinsing with water three times, the resin is packed into a fixed bed with a height-to-diameter ratio of 2:1. Toluene with a volume ratio of 5 times that of the resin is introduced into the fixed bed at a flow rate of 1.2 BV / h. The resin is then purged into the reactor with steam at 160°C for 300 min. The resin is then packed into a fixed bed with a height-to-diameter ratio of 3:1, and the resin is rinsed with water at a flow rate of 5 BV / h (bed volume / hour) with a volume ratio of 10 times that of the resin.

[0127] The resin was cleaned sequentially using NaOH aqueous solution, HCl aqueous solution, and pure water. The NaOH aqueous solution had a concentration of 2 mol / L and was used in a volume 5 times the resin volume. The HCl aqueous solution had a concentration of 5 mol / L and was used in a volume 10 times the resin volume. Pure water had a conductivity of 2 μS / cm and was used in a volume 100 times the resin volume.

[0128] Example 6

[0129] Example 6 of this application provides a resin pretreatment method for a strong acid cation exchange resin, comprising the following steps:

[0130] After rinsing with water 6 times, the resin is packed into a fixed bed with a height-to-diameter ratio of 2:1. Toluene with a volume ratio of 5 times that of the resin is introduced into the fixed bed at a flow rate of 1.2 BV / h. The resin is then purged with steam at 130°C for 240 min. The resin is then packed into a reactor with a height-to-diameter ratio of 3:1 and rinsed with water at a flow rate of 5 BV / h (bed volume / hour) with a volume ratio of 10 times that of the resin.

[0131] The resin was cleaned sequentially using NaOH aqueous solution, HCl aqueous solution, and pure water. The NaOH aqueous solution had a concentration of 2 mol / L and was used in a volume 5 times the resin volume. The HCl aqueous solution had a concentration of 5 mol / L and was used in a volume 10 times the resin volume. Pure water had a conductivity of 3 μS / cm and was used in a volume 80 times the resin volume.

[0132] Example 7

[0133] Example 7 of this application provides a resin pretreatment method for a strong acid cation exchange resin, comprising the following steps:

[0134] After washing with water four times, the resin was packed into a fixed bed with a height-to-diameter ratio of 2:1. Methanol with a volume ratio of 5 times that of the resin was introduced into the fixed bed at a flow rate of 1.2 BV / h. The resin was then purged into the reactor with steam at 110°C for 600 min. The resin was then packed into a reactor with a height-to-diameter ratio of 4:1 and washed with water with a volume ratio of 10 times that of the resin at a flow rate of 5 BV / h (bed volume / hour).

[0135] The resin was cleaned sequentially using NaOH aqueous solution, HCl aqueous solution, and pure water. The NaOH aqueous solution had a concentration of 2 mol / L and was used in a volume 5 times the resin volume. The HCl aqueous solution had a concentration of 5 mol / L and was used in a volume 10 times the resin volume. Pure water had a conductivity of 5 μS / cm and was used in a volume 150 times the resin volume.

[0136] Example 8

[0137] Example 8 of this application provides a resin pretreatment method for a strong acid cation exchange resin, comprising the following steps:

[0138] After rinsing with water three times, the resin is packed into a fixed bed with a height-to-diameter ratio of 2:1. Ethanol with a volume ratio of 5 times that of the resin is introduced into the fixed bed at a flow rate of 1 BV / h. The resin is then purged with steam at 120°C for 240 min. The resin is then packed into a reactor with a height-to-diameter ratio of 3:1, and the resin is rinsed with water with a volume ratio of 10 times that of the resin at a flow rate of 2 BV / h (bed volume / hour).

[0139] The resin was cleaned sequentially using NaOH aqueous solution, HCl aqueous solution, and pure water. The NaOH aqueous solution had a concentration of 3 mol / L and was used in a volume twice the volume of the resin. The HCl aqueous solution had a concentration of 5 mol / L and was used in a volume 50 times the volume of the resin. Pure water, with a conductivity of 1 μS / cm, was used in a volume 200 times the volume of the resin.

[0140] Example 9

[0141] Example 9 of this application provides a resin pretreatment method for a strong base anion exchange resin, comprising the following steps:

[0142] After rinsing with water three times, the resin is packed into a reactor with a height-to-diameter ratio of 1:1. Methanol with a volume ratio of 4 times that of the resin is introduced into the fixed bed or reactor at a flow rate of 0.5 BV / h. The reactor is then purged with 100°C steam for 30 minutes. The resin is then packed into a fixed bed with a height-to-diameter ratio of 1.5:1 and rinsed with water at a flow rate of 2 BV / h (bed volume / hour) with a volume ratio of 2 times that of the resin.

[0143] The resin was cleaned sequentially using an aqueous HCl solution, an aqueous NaOH solution, and pure water. The HCl solution had a concentration of 4 mol / L and was used in a volume equal to one times the resin volume. The NaOH solution had a concentration of 5 mol / L and was used in a volume equal to five times the resin volume. Pure water, with a conductivity of 0.1 μS / cm, was used in a volume equal to 100 times the resin volume.

[0144] Example 10

[0145] Example 10 of this application provides a resin pretreatment method for a strong base anion exchange resin, comprising the following steps:

[0146] After rinsing with water 5 times, the resin is packed into a fixed bed with a height-to-diameter ratio of 2:1. Acetone with a volume ratio of 1.5 times that of the resin is introduced into the fixed bed at a flow rate of 1 BV / h. The resin is then purged into the reactor with 100°C steam for 90 min. The resin is then packed into a fixed bed with a height-to-diameter ratio of 2:1 and rinsed with water at a flow rate of 3 BV / h (bed volume / hour) with a volume ratio of 5 times that of the resin.

[0147] The resin was cleaned sequentially using an aqueous HCl solution, an aqueous NaOH solution, and pure water. The HCl solution had a concentration of 3 mol / L and was used in a volume twice the volume of the resin. The NaOH solution had a concentration of 3 mol / L and was used in a volume ten times the volume of the resin. Pure water, with a conductivity of 0.2 μS / cm, was used in a volume 200 times the volume of the resin.

[0148] Example 11

[0149] Example 11 of this application provides a resin pretreatment method for a strong base anion exchange resin, comprising the following steps:

[0150] After rinsing with water 8 times, the resin was packed into a reactor with a height-to-diameter ratio of 2:1. Ethanol with a volume ratio of 8 times that of the resin was introduced into the reactor at a flow rate of 1.5 BV / h. The reactor was then purged with steam at 120°C for 150 min. The resin was then packed into a fixed bed with a height-to-diameter ratio of 2:1 and rinsed with water with a volume ratio of 8 times that of the resin at a flow rate of 4 BV / h (bed volume / hour).

[0151] The resin was cleaned sequentially using an aqueous HCl solution, an aqueous NaOH solution, and pure water. The HCl solution had a concentration of 2 mol / L and was used in a volume four times the resin volume. The NaOH solution had a concentration of 2 mol / L and was used in a volume 20 times the resin volume. Pure water, with a conductivity of 1 μS / cm, was used in a volume 400 times the resin volume.

[0152] Example 12

[0153] Example 12 of this application provides a resin pretreatment method for a strong base anion exchange resin, comprising the following steps:

[0154] After rinsing with water 10 times, the resin is packed into a fixed bed with a height-to-diameter ratio of 2:1. Methanol with a volume ratio of 10 times that of the resin is introduced into the fixed bed at a flow rate of 2 BV / h. The resin is then purged into the reactor with steam at 140°C for 180 min. The resin is then packed into a fixed bed with a height-to-diameter ratio of 2.5:1 and rinsed with water with a volume ratio of 10 times that of the resin at a flow rate of 5 BV / h (bed volume / hour).

[0155] The resin was cleaned sequentially using an aqueous HCl solution, an aqueous NaOH solution, and pure water. The HCl solution had a concentration of 1 mol / L and was used in a volume three times the resin volume. The NaOH solution had a concentration of 1 mol / L and was used in a volume 30 times the resin volume. Pure water, with a conductivity of 2 μS / cm, was used in a volume 500 times the resin volume.

[0156] Example 13

[0157] Example 13 of this application provides a resin pretreatment method for a strong base anion exchange resin, comprising the following steps:

[0158] After rinsing with water 10 times, the resin is packed into a fixed bed with a height-to-diameter ratio of 2:1. Methanol with a volume ratio of 10 times that of the resin is introduced into the fixed bed at a flow rate of 2 BV / h. The resin is then purged into the reactor with steam at 140°C for 180 min. The resin is then packed into a fixed bed with a height-to-diameter ratio of 2.5:1 and rinsed with water with a volume ratio of 10 times that of the resin at a flow rate of 5 BV / h (bed volume / hour).

[0159] The resin was cleaned sequentially using an aqueous HCl solution, an aqueous NaOH solution, and pure water. The HCl solution had a concentration of 0.5 mol / L and was used in a volume 5 times the resin volume. The NaOH solution had a concentration of 0.5 mol / L and was used in a volume 50 times the resin volume. Pure water, with a conductivity of 0.055 μS / cm, was used in a volume 300 times the resin volume.

[0160] Example 14

[0161] Example 14 of this application provides a resin pretreatment method for macroporous adsorption resin, comprising the following steps:

[0162] After rinsing with water five times, the resin was packed into a fixed bed with a height-to-diameter ratio of 2:1. Methanol, with a volume ratio of 10 times that of the resin, was introduced into the fixed bed at a flow rate of 1 BV / h. The resin was then purged with steam at 150°C for 200 min. The resin was then rinsed with water, with a volume ratio of 10 times that of the resin, at a flow rate of 5 BV / h (bed volume / hour).

[0163] The resin was cleaned sequentially with 10 times its volume of Na₂SO₄ aqueous solution (1 mol / L), HCl aqueous solution (1 mol / L), and NaOH aqueous solution (1 mol / L). After cleaning, it was rinsed with pure water, which has a conductivity of 5 μS / cm, at a volume ratio of 400 times that of the resin.

[0164] Example 15

[0165] Example 15 of this application provides a resin pretreatment method for macroporous adsorption resin, comprising the following steps:

[0166] After rinsing with water 6 times, the resin was packed into a fixed bed with a height-to-diameter ratio of 2:1. Ethanol with a volume ratio of 8 times that of the resin was introduced into the fixed bed at a flow rate of 1 BV / h. The resin was then purged with steam at 130°C for 300 min. The resin was then rinsed with water at a flow rate of 2 BV / h (bed volume / hour) with a volume ratio of 8 times that of the resin.

[0167] The resin was cleaned sequentially with 10 times its volume of NaOH aqueous solution (1 mol / L), HCl aqueous solution (2 mol / L), and Na2SO4 aqueous solution (1 mol / L). After cleaning, it was rinsed with pure water, which has a conductivity of 0.5 μS / cm, at a volume ratio of 500 times that of the resin.

[0168] Comparative Example 1

[0169] Comparative Example 1 of this application provides a resin pretreatment method, which differs from Example 1 in that the resin to be tested is filled into a container with a height-to-diameter ratio of 1:1.

[0170] Comparative Example 2

[0171] Comparative Example 2 of this application provides a resin pretreatment method, which differs from Example 1 in that the resin to be tested is filled into a container with a height-to-diameter ratio of 6:1.

[0172] Comparative Example 3

[0173] Comparative Example 1 of this application provides a resin pretreatment method, which differs from Example 9 in that the resin to be tested is filled into a container with a height-to-diameter ratio of 1:1.

[0174] Comparative Example 4

[0175] Comparative Example 2 of this application provides a resin pretreatment method, which differs from Example 9 in that the resin to be tested is filled into a container with a height-to-diameter ratio of 6:1.

[0176] Comparative Example 5

[0177] Comparative Example 5 of this application did not involve a resin pretreatment method, and its resin type was the same as that in Example 1.

[0178] Comparative Example 6

[0179] Comparative Example 6 of this application did not involve a resin pretreatment method, and its resin type was the same as that of Example 9.

[0180] Performance testing

[0181] The resins obtained by the resin pretreatment methods of Examples 1 to 15 and Comparative Examples 1 to 6 were subjected to impurity residue tests. The specific test methods were DL / T 1077-2018 Determination of Organic Leachables in Ion Exchange Resins and NB / T 25097-2018 Determination of Metal Impurity Content in Ion Exchange Resins for Nuclear Power Plants. The test results are shown in Table 1.

[0182] Table 1. Performance test results of the resin pretreatment methods in Examples 1 to 15 and Comparative Examples 1 to 6 (Unit: mg / kg dry resin)

[0183]

[0184] As shown in Table 1, Comparative Example 1 has a high content of most impurity ions due to its small aspect ratio. Comparative Example 2 has a large aspect ratio, resulting in a sharp increase in cost, approximately 30% higher than that of Example 1.

[0185] Comparative Example 3 had a high content of most impurity ions due to its small aspect ratio.

[0186] Comparative Example 4 suffered from an excessively large height-to-diameter ratio, resulting in a sharp increase in cost, approximately 65% ​​higher than that of Example 9.

[0187] Comparative Example 5 had a higher content of all impurities because the resin was not pretreated.

[0188] Comparative Example 6 had a higher content of all impurities because the resin was not pretreated.

[0189] In summary, after washing with water using a container with a height-to-diameter ratio of (1.5–4):1, and selecting an appropriate treatment method based on the type of resin, the amount of residue carried by the resin can be reduced, thus minimizing water pollution during treatment and improving the quality of the resin-treated water to meet higher requirements. It should be noted that the height-to-diameter ratio of the treatment container affects the contact state between the resin particles and water, thereby influencing the amount of resin residue.

[0190] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0191] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. In this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly specified.

[0192] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A resin pretreatment method characterized by, The method comprises the following steps: The resin to be tested is washed with water for 3-10 times, filled in a washing container with a height-diameter ratio of (1-2):1, washed with an organic solvent, and treated by steam stripping; The resin to be tested is filled in a container with a height-diameter ratio of (1.5-4):1, washed with water, and a first resin is obtained; If the type of the resin to be treated is a basic anion resin, the first resin is sequentially subjected to acid washing, alkali washing and water washing, and a pretreated resin is obtained, and the pretreatment is carried out in a carbon dioxide isolated environment; If the type of the resin to be treated is an acid cation resin, the first resin is sequentially subjected to alkali washing, acid washing and water washing, and a pretreated resin is obtained, and the pretreatment is carried out in a carbon dioxide isolated environment; If the type of the resin to be treated is an adsorption resin, the first resin is subjected to salt washing, acid washing and alkali washing, and a pretreated resin is obtained, and the pretreatment is carried out in a carbon dioxide isolated environment; The organic solvent comprises at least one of methanol, ethanol, acetone and toluene; The temperature of the steam is 100-160 DEG C; The steam stripping time is 30-600 min; In the step of sequentially subjecting the first resin to acid washing, alkali washing and water washing to obtain the pretreated resin, the acid comprises at least one of HCl and H2SO4, the molar concentration of the acid is 0.5-4 mol / L, the alkali comprises at least one of NaOH and KOH, the molar concentration of the alkali is 0.5-5 mol / L, and the conductivity of the water during the water washing is 0.055-2 mu S / cm; In the step of sequentially subjecting the first resin to alkali washing, acid washing and water washing to obtain the pretreated resin, the alkali comprises at least one of NaOH and KOH, the molar concentration of the alkali is 0.1-2 mol / L, the acid comprises at least one of HCl and H2SO4, the molar concentration of the acid is 1-5 mol / L, and the conductivity of the water during the water washing is 0.055-5 mu S / cm; In the step of subjecting the first resin to salt washing, acid washing and alkali washing to obtain the pretreated resin, the salt comprises at least one of Na2SO4 and NaCl, the mass fraction of the salt in the salt solution during the salt washing is 1%-20%, the acid comprises at least one of HCl and H2SO4, the molar concentration of the acid is 1-5 mol / L, the alkali comprises at least one of NaOH and KOH, and the molar concentration of the alkali is 0.1-2 mol / L.

2. The resin pretreatment method according to claim 1, wherein: the volume ratio of the organic solvent to the resin to be tested during the organic solvent washing is (1.5-10):1; and / or the flow rate of the organic solvent is 0.5-2 BV / h. In the step of filling the resin to be tested in a container with a height-diameter ratio of (1.5-4):1 and washing with water to obtain the first resin, the volume ratio of the water to the resin to be tested during the water washing is (2-10):1; and / or the flow rate of the water during the water washing is 2-5 BV / h. In the step of sequentially subjecting the first resin to acid washing, alkali washing and water washing to obtain the pretreated resin, the acid comprises at least one of HCl and H2SO4, the molar concentration of the acid is 0.5-4 mol / L, the alkali comprises at least one of NaOH and KOH, the molar concentration of the alkali is 0.5-5 mol / L, and the conductivity of the water during the water washing is 0.055-2 mu S / cm.

3. The resin pretreatment method according to claim 1, wherein ​ ​ ​ 4. The resin pretreatment method according to claim 1, wherein ​ The volume ratio of the acid solution to the first resin is (1-5):1 during the acid washing; and / or, The volume ratio of the alkali solution to the first resin is (5-50):1 during the alkali washing; and / or, The volume ratio of water to the first resin is (50-500):1 during the water washing.

5. The resin pretreatment method according to claim 1, wherein If the type of the resin to be treated is acidic cation resin, the first resin is sequentially subjected to alkali washing, acid washing and water washing to obtain the pretreated resin, wherein: The volume ratio of the alkali solution to the first resin is (2-5):1 during the alkali washing; and / or, The volume ratio of the acid solution to the first resin is (5-50):1 during the acid washing; and / or, The volume ratio of water to the first resin is (10-200):1 during the water washing.

6. The resin pretreatment method according to claim 1, wherein If the type of the resin to be treated is adsorption resin, the first resin is subjected to salt washing, acid washing and alkali washing to obtain the pretreated resin, wherein: The volume ratio of the salt solution to the first resin is (1-50):1 during the salt washing; and / or, The volume ratio of the acid solution to the first resin is (1-50):1 during the acid washing; and / or, The volume ratio of the alkali solution to the first resin is (5-50):1 during the alkali washing.

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