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在流化床中,用三碳酸铀酰铵分解还原制得的UO_2,吸收氢氟化生产UF_4尾气中的HF,在UO_2转化率为60%,床层温度控制在300℃左右的情况下,吸收流化床排放尾气中HF浓度可小于7～8%(重量),即HF表观过剩系数已降至0%左右。因此,利用三碳酸铀酰铵分解还原生产的UO_2所具有的高氢氟化反应性,采用双级流化床串联气固逆流流动工艺流程,可以大大降低氢氟化工艺中HF过剩量。
In the fluidized bed, the UO 2 produced by the decomposition and reduction of uranyl ammonium tricarbonate is used to absorb the hydrofluoric acid to produce HF in the tail gas of UF 4. When the conversion of UO 2 is 60% and the bed temperature is controlled at about 300 ℃, Absorption of fluidized bed effluent exhaust HF concentration can be less than 7 to 8% by weight, that is, the apparent excess coefficient of HF has dropped to about 0%. Therefore, the use of uranyl ammonium tricarbonate decomposition reduction of UO_2 produced by the high hydrofluorination reactivity, the use of two-stage fluidized bed series gas-solid countercurrent flow process, can greatly reduce the amount of excess hydrogen fluoride in the process.