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Laboratory and Pilot Plant Tests on the Production of Ammonium Uranous Fluoride in Refining Operations

RE. Robinson

出版	1964
URL	http://books.google.com.hk/books?id=nIgYjwEACAAJ&hl=&source=gbs_api

註釋

Ammonium uranous fluoride (UF4. NH4F) was precipitated from a solution containing uranyl nitrate (UO2(NO3)2), ammonium fluoride (NH4F) and formic acid (HCOOH) by the introduction of sulphur dioxide (SO2). Laboratory tests showed that at elevated temperatures the rate of precipitation of UF4. NH4F was constant and largely dependent on the initial HCOOH concentration. The constant driving force during the reaction was attributed to the continuous regeneration of an active reducing agent, and a reaction mechanism based on regeneration in a formic acid - formaldehyde sulphoxylate system was proposed. The practical advantages of lowering reagent costs, by using the regenerated reducing agent remaining in the depleted solution after the uranium had been precipitated, were demonstrated. Pilot plant tests showed that it was possible to produce a product of nuclear grade purity after having overcome severe corrosion problems. It is considered that the present relatively high reagent costs of.