阅读说明：本技术 一种废旧阳离子交换树脂的再生方法 (Regeneration method of waste cation exchange resin ) 是由 杨奇 杨慧慧 于 2021-09-24 设计创作，主要内容包括：本发明涉及先进石化化工新材料技术领域,具体为一种废旧阳离子交换树脂的再生方法,包括以下步骤：S1、将弱酸阳离子交换树脂放入强酸阳离子交换溶液中混合,去除废水中的硬度；S2、在除去废水中硬度的阳离子交换树脂溶液中添加重金属螯合剂,在混合搅拌设备中进行持续搅拌；S3、清除沉淀物,然后将上述所得溶液进行多级过滤处理；S4、在适合的环境温度下,将百分之四树脂床体积的4倍盐酸通入树脂床；S5、通入2-3倍于树脂体积的除盐水,处理过后即可得阳离子交换树脂,本发明实现对阳离子交换树脂再生处理得到较大的优化,保证可以对树脂所吸附处理的重金属进行祛除,同时完成重金属的回收利用,对树脂再生处理的过程中保证树脂的再生质量。(The invention relates to the technical field of advanced petrochemical new materials, in particular to a regeneration method of waste cation exchange resin, which comprises the following steps: s1, putting the weak acid cation exchange resin into a strong acid cation exchange solution for mixing, and removing the hardness in the wastewater; s2, adding a heavy metal chelating agent into the cation exchange resin solution with the hardness removed from the wastewater, and continuously stirring in a mixing and stirring device; s3, removing precipitates, and then carrying out multi-stage filtration treatment on the obtained solution; s4, passing hydrochloric acid 4 times the volume of the resin bed four percent into the resin bed at a suitable ambient temperature; s5, introducing demineralized water with the volume 2-3 times that of the resin, and obtaining the cation exchange resin after treatment.)

1. The regeneration method of the waste cation exchange resin is characterized by comprising the following steps:

s1, putting the weak acid cation exchange resin into a strong acid cation exchange solution for mixing, and removing the hardness in the wastewater;

s2, adding a heavy metal chelating agent into the cation exchange resin solution with the hardness removed from the wastewater, and continuously stirring in a mixing and stirring device;

s3, removing precipitates, and then carrying out multi-stage filtration treatment on the obtained solution;

s4, introducing hydrochloric acid 4 times the volume of the resin bed at a suitable ambient temperature for about 2 hours, wherein the hydrochloric acid is four percent of the volume of the resin bed;

and S5, introducing desalted water with the volume 2-3 times that of the resin at the same flow rate and flow direction, and treating to obtain the cation exchange resin.

2. The method for regenerating a waste cation exchange resin according to claim 1, wherein: and in the S1, the effluent of the weak acid cation exchange resin is refluxed to the mixed solution of the strong acid cation exchange resin so as to remove the hardness in the wastewater again.

3. The method for regenerating a waste cation exchange resin according to claim 1, wherein: and decarbonizing the wastewater after the hardness is removed.

4. The method for regenerating a waste cation exchange resin according to claim 1, wherein: the heavy metal chelating agent is prepared on the basis of a nano silicon dioxide hollow material.

5. The method for regenerating a waste cation exchange resin according to claim 1, wherein: and in the step S2, continuously stirring in a mixing and stirring device for 20-50 min.

6. The method for regenerating a waste cation exchange resin according to claim 1, wherein: and in the step S1, removing impurities, namely adding strong acid cation solution to soak the activated cation exchange resin, wherein the soaking temperature is 40-90 ℃.

7. The method for regenerating a waste cation exchange resin according to claim 1, wherein: the multi-stage filtration treatment adopted in the S3 is formed by compounding three layers of metal filter screens, wherein the three layers of metal filter screens have the aperture of 30-60 meshes, 80-150 meshes and 150-30 meshes in sequence, and the metal filter screens are made of stainless steel or metal titanium.

8. The method for regenerating a waste cation exchange resin according to claim 1, wherein: and in the step S5, desalted water is injected from top to bottom, the treatment temperature is 30-60 ℃, and the treatment time is 1-3 hours.

9. The method for regenerating a waste cation exchange resin according to claim 1, wherein: the regeneration of the resin can be completed by flushing the cation exchange resin with relatively pure water after the treatment of S5.

Technical Field

The invention relates to the technical field of advanced petrochemical new materials, in particular to a regeneration method of waste cation exchange resin.

Background

Cation exchange resin is a chemical substance, mainly used for producing refined sugar and purifying high-grade edible syrup. The ion exchange resin is generally porous or granular and has a size of about 0.5 to 1.0 mm. After the cation exchange resin participates in the production process of high-temperature hydrolysis or high-temperature catalysis, the adsorption capacity is reduced to below 50% in about half a year, and the service life of the cation exchange resin is shortened. The conventional regeneration process has difficulty in recovering the adsorption capacity of the cation exchange resin, and thus the cation exchange resin is gradually scrapped.

The currently adopted treatment method for regenerating the adsorption capacity of the cation exchange resin is difficult to recover the cation exchange resin, can not remove the heavy metals adsorbed by the cation exchange resin, can not complete the recycling of the heavy metals, and can not better ensure the regeneration quality of the resin in the process of resin regeneration treatment, so that the significance of resin regeneration is reduced.

Disclosure of Invention

The invention aims to provide a regeneration method of waste cation exchange resin, which comprises the following steps:

s1, putting the weak acid cation exchange resin into a strong acid cation exchange solution for mixing, and removing the hardness in the wastewater;

s2, adding a heavy metal chelating agent into the cation exchange resin solution with the hardness removed from the wastewater, and continuously stirring in a mixing and stirring device;

s3, removing precipitates, and then carrying out multi-stage filtration treatment on the obtained solution;

s4, introducing hydrochloric acid 4 times the volume of the resin bed at a suitable ambient temperature for about 2 hours, wherein the hydrochloric acid is four percent of the volume of the resin bed;

and S5, introducing desalted water with the volume 2-3 times that of the resin at the same flow rate and flow direction, and treating to obtain the cation exchange resin.

Optionally, in S1, the effluent of the weak acid cation exchange resin is refluxed to the mixed solution of the strong acid cation exchange resin to remove the hardness in the wastewater again.

Optionally, the wastewater after removing hardness is subjected to decarburization treatment.

Optionally, the heavy metal chelating agent is prepared based on a nano-silica hollow material.

Optionally, in the step S2, the stirring time in the mixing and stirring device is 20-50 min.

Optionally, the step of removing the impurities in the step S1 is to add a strong acid cation solution to soak the activated cation exchange resin, and the soaking temperature is 40-90 ℃.

Optionally, the multi-stage filtration treatment adopted in S3 is formed by compounding three layers of metal filter screens, the three layers of metal filter screens have apertures of 30-60 meshes, 80-150 meshes and 150-30 meshes in sequence, and the metal filter screens are made of stainless steel or metal titanium.

Optionally, the demineralized water is injected from top to bottom in the step S5, the treatment temperature is 30-60 ℃, and the treatment time is 1-3 hours.

Alternatively, the regeneration of the resin may be accomplished by rinsing the cation exchange resin with relatively pure water after the treatment of S5.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the heavy metal chelating agent is added into the cation exchange resin solution for removing the hardness in the wastewater, the mixture is continuously stirred in a mixing and stirring device to remove precipitates, then the obtained solution is subjected to multistage filtration treatment, and the filtration treatment is formed by compounding three layers of metal filter screens, so that the cation exchange resin regeneration treatment is greatly optimized, the heavy metals adsorbed and treated by the resin can be removed, the heavy metals are recycled, and the resin regeneration quality is further ensured in the resin regeneration treatment process.

Drawings

FIG. 1 is a flow chart of the regeneration method of the waste cation exchange resin of the present invention.

The objects, features, and advantages of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a method for regenerating a waste cation exchange resin, comprising the following steps:

s1, putting the weak acid cation exchange resin into a strong acid cation exchange solution for mixing, and removing the hardness in the wastewater;

s2, adding a heavy metal chelating agent into the cation exchange resin solution with the hardness removed from the wastewater, and continuously stirring in a mixing and stirring device;

s3, removing precipitates, and then carrying out multi-stage filtration treatment on the obtained solution;

s4, introducing hydrochloric acid 4 times the volume of the resin bed at a suitable ambient temperature for about 2 hours, wherein the hydrochloric acid is four percent of the volume of the resin bed;

and S5, introducing desalted water with the volume 2-3 times that of the resin at the same flow rate and flow direction, and treating to obtain the cation exchange resin.

Refluxing the effluent of the weak acid cation exchange resin to the mixed solution of the strong acid cation exchange in the S1 to remove the hardness in the wastewater again; it is ensured that the alkalinity in the weak acid cation exchange solution is always greater than the hardness to remove all hardness in the wastewater.

And decarbonizing the wastewater after the hardness is removed.

The heavy metal chelating agent is prepared on the basis of a nano silicon dioxide hollow material; the heavy metal chelating agent is prepared on the basis of the nano silicon dioxide hollow material, so that the heavy metal chelating agent has the advantages of high specific area, thermal insulation, acid-base stability, improvement on the adsorption efficiency of heavy metals and the like.

In the step S2, continuously stirring in a mixing and stirring device for 20-50 min; different treatment time can be regulated and controlled according to different environments, so that a better treatment result is achieved.

And in the step S1, the impurity removal is to add a strong acid cation solution to soak the activated cation exchange resin, the soaking temperature is 40-90 ℃, the cation exchange resin can be quickly soaked by limiting the soaking temperature, and the soaking temperature cannot be influenced.

The multi-stage filtration treatment adopted in the S3 is formed by compounding three layers of metal filter screens, wherein the three layers of metal filter screens have the aperture of 30-60 meshes, 80-150 meshes and 150-30 meshes in sequence, and the metal filter screens are made of stainless steel or metal titanium; through the adopted filtering treatment, impurities in the solution can be cleaned to the greatest extent, and basic treatment is provided for further improving the regeneration quality of the resin.

Injecting desalted water into the S5 from top to bottom, wherein the treatment temperature is 30-60 ℃, and the treatment time is 1-3 hours; the demineralized water is injected from top to bottom, so that the empty bed volume can play a role in diluting the regenerant, and the phenomenon that the direct injection of the demineralized water from the bottom of the resin bed can cause great permeability impact is avoided.

The regeneration of the resin can be completed by flushing the cation exchange resin with relatively pure water after the treatment of S5.

Wherein the principle of resin regeneration refers to a process of loading ion exchange resin beads and removing ions adsorbed during cycling in use, thereby allowing the resin to be continuously used. The anion and cation exchange system is composed of a resin bed, and can obtain hardness or other elements through ion exchange. Then regenerating the resin beads by introducing high concentration (10% brine) salt or other regeneration chemicals to restore the exchange capacity of the resin, so that the ion exchange resin system can be used repeatedly

The working process and principle of the invention are as follows: mixing weak acid cation exchange resin in a strong acid cation exchange solution to remove the hardness in wastewater, refluxing the effluent of the weak acid cation exchange resin to the mixed solution of the strong acid cation exchange to remove the hardness in the wastewater again, performing decarburization treatment on the wastewater after the hardness is removed, then adding a heavy metal chelating agent into the cation exchange resin solution after the hardness in the wastewater is removed, continuously stirring for 20-50min in a mixing and stirring device, wherein the heavy metal chelating agent is prepared on the basis of a nano-silica hollow material, and is formed by compounding three layers of metal filter screens through multistage filtration treatment, the three layers of metal filter screens sequentially have the aperture of 30-60 meshes, 80-150 meshes and 150-30 meshes, the metal filter screens are made of stainless steel or metal titanium, and then introducing hydrochloric acid which is 4 times of the volume of the four resin beds into the resin beds at a proper environmental temperature, the introduction time is about 2 hours, then the demineralized water with the volume 2-3 times of the resin is introduced at the same flow velocity and flow direction, the cation exchange resin can be obtained after the treatment, and finally the cation exchange resin is washed by pure water, and the regeneration of the resin can be completed.

While the invention has been described in further detail in connection with specific embodiments thereof, it will be understood that the invention is not limited thereto, and that various other modifications and substitutions may be made by those skilled in the art without departing from the spirit of the invention, which should be considered to be within the scope of the invention as defined by the appended claims.