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Development of a Unique Process for Recovery of Uranium from Incinerator Ash

机译：从焚烧炉灰中回收铀的独特工艺开发

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摘要

A unique new industrial process has been developed that recovers uranium from incinerator ash produced by nuclear fuel fabrication plants. The process utilizes nitric acid and tri-n-butylphosphate (TBP) dissolved in supercritical carbon dioxide to extract uranium oxide directly into the supercritical fluid without a separate acid dissolution step. The process was developed in phases beginning with bench-scale feasibility tests and concluding with pilot plant demonstration tests. The bench-scale feasibility experiments tested basic chemistry and the ability of the process to extract uranium from incinerator ash. Pilot-scale tests determined practical operating conditions and scale-up factors for the design and implementation of a full-scale process. AREVA NP Inc. completed construction of a full-scale ash uranium plant in 2009 that will allow safe and environmentally friendly uranium recovery from ash and other low-uranium materials that would otherwise be uneconomic if done by conventional methods.
机译：已开发出一种独特的新工业工艺，该工艺可从核燃料制造厂生产的焚烧炉灰中回收铀。该方法利用溶解在超临界二氧化碳中的硝酸和磷酸三正丁酯（TBP），将铀氧化物直接萃取到超临界流体中，而无需单独的酸溶解步骤。该过程分阶段进行，从实验室规模的可行性测试开始，到试验工厂示范测试结束。实验室规模的可行性实验测试了基本化学原理以及该工艺从焚烧炉灰中提取铀的能力。中试测试确定了实际操作条件和放大因子，用于设计和实施全过程。 AREVA NP Inc.在2009年完成了一座大型灰烬铀厂的建设，这将允许从灰烬和其他低铀材料中安全，环保地回收铀，如果采用常规方法，这将是不经济的。

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