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1.发明申请Sodium Salt Recycling Process for Use in Wet Reprocessing Process of Spent Nuclear Fuel 有权用于废核燃料的湿再加工过程中的钠盐回收方法公开(公告)号：US20090068075A1
公开(公告)日：2009-03-12
申请号：US12087288
申请日：2007-01-15
Applicant: Yoshinobu Takaoku , Yukio Sumida , Noriyasu Moriya
Inventor： Yoshinobu Takaoku , Yukio Sumida , Noriyasu Moriya
CPC classification number: G21C19/46 , G21F9/125 , Y02W30/883
Abstract: The present invention is directed to a process for recycling of a sodium salt by decomposition of a sodium nitride liquid waste. The process comprises: a neutralization step in which a nitric acid liquid waste or an off-gas having nitric acid dissolved therein which is produced through a wet reprocessing process comprising a dissolution step for dissolving a spent nuclear fuel in nitric acid is neutralized by adding or contacting the nitrate liquid waste or the off-gas to or with at least one sodium salt selected from sodium hydroxide, sodium hydrogencarbonate and sodium carbonate, thereby yielding a sodium nitrate liquid waste; a sodium nitrate-decomposition step in which the sodium nitrate liquid waste is reductively decomposed with a reducing agent, thereby decomposing sodium nitrate into a nitrogen gas and the sodium salt; and a recycle step for recycling the sodium salt into the neutralization step or wet reprocessing process. The sodium nitrate liquid waste obtained in the neutralization step may be concentrated by evaporation to give a concentrated sodium nitrate liquid waste, and the condensed sodium nitrate liquid waste may be reductively decomposed in the sodium nitrate-decomposition step.
Abstract translation: 本发明涉及一种通过分解氮化钠液体废物再循环钠盐的方法。 该方法包括：中和步骤，其中通过包括用于将废核燃料溶解在硝酸中的溶解步骤的湿再加工过程产生的硝酸液体废物或其中溶解有硝酸的废气通过加入或 将硝酸液体废物或废气与至少一种选自氢氧化钠，碳酸氢钠和碳酸钠的钠盐接触或与其接触，从而产生硝酸钠废液; 硝酸钠分解步骤，其中硝酸钠液体废物用还原剂还原分解，从而将硝酸钠分解成氮气和钠盐; 以及将钠盐再循环到中和步骤或湿再加工过程中的再循环步骤。 在中和步骤中获得的硝酸钠废液可以通过蒸发浓缩，得到浓硝酸钠废液，并且在硝酸钠分解步骤中还原硝酸钠废液可被还原分解。
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2.发明授权Sodium salt recycling process for use in wet reprocessing process of spent nuclear fuel 有权用于乏核燃料的湿再加工过程的钠盐回收工艺公开(公告)号：US07666370B2
公开(公告)日：2010-02-23
申请号：US12087288
申请日：2007-01-15
Applicant: Yoshinobu Takaoku , Yukio Sumida , Noriyasu Moriya
Inventor： Yoshinobu Takaoku , Yukio Sumida , Noriyasu Moriya
CPC classification number: G21C19/46 , G21F9/125 , Y02W30/883
Abstract: The present disclosure relates to a process for recycling a sodium salt by decomposition of a sodium nitride liquid waste, comprising a neutralization step in which a nitric acid liquid waste or an off-gas having nitric acid dissolved therein which is produced through a wet reprocessing process comprising a dissolution step for dissolving a spent nuclear fuel in nitric acid is neutralized by adding or contacting the nitrate liquid waste or the off-gas to or with at least one sodium salt selected from the group consisting of sodium hydroxide, sodium hydrogencarbonate and sodium carbonate, thereby yielding a sodium nitrate liquid waste; a sodium nitrate-decomposition step in which the sodium nitrate liquid waste is reductively decomposed with a reducing agent, thereby decomposing sodium nitrate into a nitrogen gas and the sodium salt; and a recycle step for recycling the sodium salt into the neutralization step or wet reprocessing process.
Abstract translation: 本公开涉及通过氮化钠液体废物分解再循环钠盐的方法，其包括中和步骤，其中通过湿再加工过程产生硝酸液体废物或其中溶解有硝酸的废气 包括用于将废核燃料溶解在硝酸中的溶解步骤，通过向硝酸液体废物或废气中加入或接触至少一种选自氢氧化钠，碳酸氢钠和碳酸钠的钠盐而中和 ，从而产生硝酸钠液体废物; 硝酸钠分解步骤，其中硝酸钠液体废物用还原剂还原分解，从而将硝酸钠分解成氮气和钠盐; 以及将钠盐再循环到中和步骤或湿再加工过程中的再循环步骤。
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