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Method for removing depleted uranium from contaminated soils

机译:从污染土壤中去除贫铀的方法

摘要

Soil, contaminated with radioactive material such as uranium, is treated to remove the radioactive contaminant. The soil is first pre- processed to remove and clean oversized particles for release back to the environment as recovered soil. Pre-processing also includes removal of metallic uranium from the soil by gravimetric separation for off-site disposal. An aqueous slurry is formed from the pre-processed feed which is fed to a mechanical separation device. Particles greater than 10 mesh are crushed to provide a uniform feed slurry. The slurry is processed in an aqueous leaching solution of sulfuric acid, hydrogen peroxide and iron to remove uranium. Particulate matter is removed from the acidic slurry; the remaining fine particulate matter is then submitted to a second-stage leaching to remove residual uranium. Uranium is recovered from the combined leaching solutions by either a two-stage precipitation process or by passage over an ion-exchange material. The process utilizes a closed loop system for process water which is reclaimed, clarified, and recirculated for reuse.
机译:处理被放射性物质(例如铀)污染的土壤,以去除放射性污染物。首先要对土壤进行预处理,以去除和清洗过大的颗粒,然后以回收的土壤形式释放到环境中。预处理还包括通过重量分离法从土壤中去除金属铀,以进行异地处置。由预处理的进料形成含水浆料,将其进料至机械分离装置。粉碎大于10目的颗粒以提供均匀的进料浆料。在硫酸,过氧化氢和铁的浸出水溶液中处理浆料,以去除铀。从酸性浆液中除去颗粒物质。然后将剩余的细颗粒物进行第二阶段浸提以去除残留的铀。通过两步沉淀法或通过离子交换材料从合并的浸提溶液中回收铀。该工艺利用用于生产用水的闭环系统,将其回收,净化和循环再利用。

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