{"title":"核电站运行中cao诱导的浓硼酸盐废物的地聚合物固化与稳定","authors":"Dong-Yong Chung, Keunyoung Lee, Sungjune Sohn","doi":"10.1007/s11814-025-00424-1","DOIUrl":null,"url":null,"abstract":"<div><p>This study examined geopolymer-based solidification and stabilization of sodium borate waste generated from nuclear power plants. As the sodium borate is highly soluble in water, the dehydration and dissolution characteristics were preliminarily investigated. The wasteform containing sodium borate anhydrous (SBA) itself was shown to exhibit a poor compressive strength after thermal circulation and immersion tests, which was below the strength criterion of 3.44 MPa. Upon the introduction of CaO to SBA solution to improve the dissolution properties of the borate waste, the synthesized compounds were found mainly composed of calcium borate hydrate (Ca<sub>2</sub>B<sub>2</sub>O<sub>5</sub>⋅H<sub>2</sub>O), sodium metaborate hydrate (Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub>⋅H<sub>2</sub>O) and Ca(OH)<sub>2</sub>. Consequently, the solubility in water and alkaline solution decreased to a value less than 10% of the solubility of SBA. The wasteform containing CaO-induced SBA was fabricated under the condition of SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> and Na<sub>2</sub>O/SiO<sub>2</sub> of 4.0 and 0.25, respectively, with waste loading of 20–30 wt%. The compressive strength values measured after 28-day curing, thermal circulation test and immersion test were higher than the criteria. The leaching characteristics of Co, Sr and Cs evaluated according to the ANSI/ANS 16.1 method were shown to satisfy the waste acceptance criteria.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 6","pages":"1237 - 1247"},"PeriodicalIF":2.9000,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Geopolymer-Based Solidification and Stabilization of CaO-Induced Concentrated Borate Waste Arising from Nuclear Power Plant Operation\",\"authors\":\"Dong-Yong Chung, Keunyoung Lee, Sungjune Sohn\",\"doi\":\"10.1007/s11814-025-00424-1\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>This study examined geopolymer-based solidification and stabilization of sodium borate waste generated from nuclear power plants. As the sodium borate is highly soluble in water, the dehydration and dissolution characteristics were preliminarily investigated. The wasteform containing sodium borate anhydrous (SBA) itself was shown to exhibit a poor compressive strength after thermal circulation and immersion tests, which was below the strength criterion of 3.44 MPa. Upon the introduction of CaO to SBA solution to improve the dissolution properties of the borate waste, the synthesized compounds were found mainly composed of calcium borate hydrate (Ca<sub>2</sub>B<sub>2</sub>O<sub>5</sub>⋅H<sub>2</sub>O), sodium metaborate hydrate (Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub>⋅H<sub>2</sub>O) and Ca(OH)<sub>2</sub>. Consequently, the solubility in water and alkaline solution decreased to a value less than 10% of the solubility of SBA. The wasteform containing CaO-induced SBA was fabricated under the condition of SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> and Na<sub>2</sub>O/SiO<sub>2</sub> of 4.0 and 0.25, respectively, with waste loading of 20–30 wt%. The compressive strength values measured after 28-day curing, thermal circulation test and immersion test were higher than the criteria. The leaching characteristics of Co, Sr and Cs evaluated according to the ANSI/ANS 16.1 method were shown to satisfy the waste acceptance criteria.</p></div>\",\"PeriodicalId\":684,\"journal\":{\"name\":\"Korean Journal of Chemical Engineering\",\"volume\":\"42 6\",\"pages\":\"1237 - 1247\"},\"PeriodicalIF\":2.9000,\"publicationDate\":\"2025-02-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Korean Journal of Chemical Engineering\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s11814-025-00424-1\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Korean Journal of Chemical Engineering","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s11814-025-00424-1","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Geopolymer-Based Solidification and Stabilization of CaO-Induced Concentrated Borate Waste Arising from Nuclear Power Plant Operation
This study examined geopolymer-based solidification and stabilization of sodium borate waste generated from nuclear power plants. As the sodium borate is highly soluble in water, the dehydration and dissolution characteristics were preliminarily investigated. The wasteform containing sodium borate anhydrous (SBA) itself was shown to exhibit a poor compressive strength after thermal circulation and immersion tests, which was below the strength criterion of 3.44 MPa. Upon the introduction of CaO to SBA solution to improve the dissolution properties of the borate waste, the synthesized compounds were found mainly composed of calcium borate hydrate (Ca2B2O5⋅H2O), sodium metaborate hydrate (Na2B4O7⋅H2O) and Ca(OH)2. Consequently, the solubility in water and alkaline solution decreased to a value less than 10% of the solubility of SBA. The wasteform containing CaO-induced SBA was fabricated under the condition of SiO2/Al2O3 and Na2O/SiO2 of 4.0 and 0.25, respectively, with waste loading of 20–30 wt%. The compressive strength values measured after 28-day curing, thermal circulation test and immersion test were higher than the criteria. The leaching characteristics of Co, Sr and Cs evaluated according to the ANSI/ANS 16.1 method were shown to satisfy the waste acceptance criteria.
期刊介绍：
The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.
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