CN85100138B - 用二氧化碳再生放射性离子交换树脂的方法 - Google Patents
用二氧化碳再生放射性离子交换树脂的方法 Download PDFInfo
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- CN85100138B CN85100138B CN85100138A CN85100138A CN85100138B CN 85100138 B CN85100138 B CN 85100138B CN 85100138 A CN85100138 A CN 85100138A CN 85100138 A CN85100138 A CN 85100138A CN 85100138 B CN85100138 B CN 85100138B
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- resin
- carbon dioxide
- ion exchange
- exchange resin
- saturated
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 19
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 18
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 239000003456 ion exchange resin Substances 0.000 title claims abstract description 12
- 229920003303 ion-exchange polymer Polymers 0.000 title claims abstract description 12
- 230000002285 radioactive effect Effects 0.000 title claims abstract description 12
- 230000001172 regenerating effect Effects 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002253 acid Substances 0.000 claims abstract description 9
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 5
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000005342 ion exchange Methods 0.000 claims description 5
- 239000011347 resin Substances 0.000 abstract description 17
- 229920005989 resin Polymers 0.000 abstract description 17
- 238000011069 regeneration method Methods 0.000 abstract description 16
- 230000008929 regeneration Effects 0.000 abstract description 15
- 239000002699 waste material Substances 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 4
- 229920001429 chelating resin Polymers 0.000 abstract description 3
- 239000010808 liquid waste Substances 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 abstract description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract 1
- 230000003213 activating effect Effects 0.000 abstract 1
- 229910052792 caesium Inorganic materials 0.000 abstract 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 abstract 1
- 229910017052 cobalt Inorganic materials 0.000 abstract 1
- 239000010941 cobalt Substances 0.000 abstract 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 abstract 1
- 229910052712 strontium Inorganic materials 0.000 abstract 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 abstract 1
- 229910052725 zinc Inorganic materials 0.000 abstract 1
- 239000011701 zinc Substances 0.000 abstract 1
- 239000003513 alkali Substances 0.000 description 4
- 238000010612 desalination reaction Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 229920005479 Lucite® Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000002242 deionisation method Methods 0.000 description 1
- 238000005115 demineralization Methods 0.000 description 1
- 230000002328 demineralizing effect Effects 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002901 radioactive waste Substances 0.000 description 1
- 239000012492 regenerant Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Treatment Of Water By Ion Exchange (AREA)
Abstract
用二氧化碳做再生剂,再生碳活化产物锶、铯、锌、钴等所饱和的离子交换树脂(包括弱酸、弱碱和强碱、螯合等树脂),在体系中,其交换产物是以二氧化碳(H2CO3 H2O+CO2)代替酸、碱法再生产生的盐。结果表明:被Pm147吸附饱和后的弱酸树脂,用二氧化碳再生后,交换容量恢复到初始值,二次废液量比酸、碱再生法减少十几倍甚至几十倍。应用于核电站放射性废水处理系统与反应堆主回路水系统,可大大减少水处理成本及核废物处理费用。
Description
本发明属于放射性离子交换树脂的再生技术。
通常对吸附饱和后的放射性离子交换树脂采用两种处理方法:一种是用酸、碱再生方法。例如“离子交换技术”关于放射性离子交换树脂的再生,用此法再生需消耗大量的酸、碱,不仅二次废液量大,而且再生废液的含盐量高,给后续的固化工艺带来很大的困难。另一种方法是直接将被放射性元素饱和后的离子交换树脂连同交换柱一起作为固体废物进行处置,此处理方法虽无废液产生,但操作麻烦,经济上很浪费。
本发明的目的是利用气态介质二氧化碳再生树脂,可极大地降低再生剂耗量和对环境的二次污染,也可减少放射性废物处理和处置的负荷。
本发明的另一目的是大大地减少运行费用。再生只消耗价廉的二氧化碳气和少量的无离子水,运行费仅为酸碱再生的十几分之一。
本发明的第三个目的是适合于放射性操作自动化和遥控。
离子交换树脂的交换过程一般系可逆过程。基于不同类型树脂的解离行为不同,用对健康和环境无害的二氧化碳作再生剂,使用离子交换法从放射性水中除盐的新工艺,例如“以二氧化碳作为再生剂,用离子交换法从水中部分除盐”。(Partial Demineralization of Water by Ion exchange USing Carbon Dioxide as Regenerant by Wolfgang H.Hoell and Wolfgang Feuerstein)
对于弱酸和强碱树脂可依据下列交换原理进行再生:
反应向右进行为除盐过程,相反,反应向左进行为再生过程。
本发明的除盐和再生化学反应式为:
Rc=(Coo-)3 Pm 3++3H2O+3CO2
再生/除盐/(COOH)3+Pm(HCO3)3
弱酸性树脂的官能团(-COOH)其PK值(K为解离常数)介于4~6之间,只有当溶液的PH值高于官能团的PK值时,这种树脂才能明显地解离,因此只适用于与弱酸溶液中的阳离子进行交换。二氧化碳的分压是交换过程的推动力。
图1为二氧化碳再生放射性离子交换树脂的流程:由泵4将缸5的无离子水打入交换柱3中。二氧化碳气从钢瓶1流入流量计2,再进入交换柱3的底部并在柱内进行鼓泡,二氧化碳气经交换柱上部的阀7排出。废液经阀8排入缸5。
再生效果是十分明显的,产生的废液量少,操作简单方便,树脂再生后的交换容量能达到初始值。
应用范围:再生核电站及其他反应堆的活化产物所饱和的离子交换树脂。再生压水堆含硼的放射性离子交换树脂。
实施例
于φ25×800的有机玻璃交换柱中,装入50毫升的501#螯合树脂(结构式为:,用Pm 147原液流过树脂,使其饱和,此时测得树脂的交换容量为2.7毫克当量/克干树脂,按图1接好再生装置,先用泵4将缸5的无离子水打入交换柱3中,循环1小时。将二氧化碳气通入交换柱3中,其分压为1公斤/厘米2,流量为400毫升/分,通气时间为24小时。为了维持足够的再生效果,交换柱中的无离子水更新过三次(8小时、16小时、20小时各一次),排出废液的PH值为6.5,排出总废液量为1.4公斤,再生后测得树脂的交换容量为4.7毫克当量/克干树脂(初始交换容量亦为4.7毫克当量/克干树脂)。将再生后501#螯合树脂再净化Pm 147原水(比放为735×10-6居里/升),交换柱出口的比放为7.07×10-7居里/升,与树脂再生前的净化效率和去污因数相同。
Claims (3)
1、一种用CO2再生离子交换树脂的方法,其特征是在已饱和的离子交换柱中,由下向上循环地通入脱离子水,此后由下向上的通入二氧化碳,控制二氧化碳分压,间歇地排出废液来控制PH值大于PK值。
2、根据权利要求1所述的方法,其特征是已饱和的离子交换树脂是被Sr90、Cs137、Zn65和Co60所饱和的放射性的弱酸、强碱和螫合型离子交换树脂。
3、根据权利要求1所述的方法,其特征是循环通入脱离子水一小时,二氧化碳分压为1公斤/cm2,排出废液的PH值为6.5。
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CN85100138A CN85100138B (zh) | 1985-04-01 | 1985-04-01 | 用二氧化碳再生放射性离子交换树脂的方法 |
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CN85100138A CN85100138B (zh) | 1985-04-01 | 1985-04-01 | 用二氧化碳再生放射性离子交换树脂的方法 |
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CN85100138A CN85100138A (zh) | 1986-07-30 |
CN85100138B true CN85100138B (zh) | 1988-08-17 |
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CN109715567A (zh) * | 2016-08-26 | 2019-05-03 | 南洋理工大学 | Co2实现的响应性吸附剂的再生和再利用 |
CN106881159B (zh) * | 2017-03-23 | 2018-08-24 | 南京大学 | 一种离子交换树脂固定床逆流再生装置及其使用方法 |
CN108928885A (zh) * | 2018-07-28 | 2018-12-04 | 芜湖沃泰环保科技有限公司 | 一种利用二氧化碳进行滤料再生的水处理技术 |
CN112875803A (zh) * | 2021-03-25 | 2021-06-01 | 山东金泽水业科技有限公司 | 一种同时实现水体净化与碳减排的循环二氧化碳再生离子交换系统及工艺 |
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