Heekin Adams (Higgins) ion exchange column, the US Bureau of Mines of the multi-compartment fluidized bed (USBM), developed by the Institute of Nuclear sixth multi-stage fluidized bed, the South African National Institute of Metallurgy Design of ion exchange equipment ( NIM), Simsley continuous countercurrent ion exchange equipment are vertical multi-compartment fluidized beds. There are also fluidized beds that operate in tandem with horizontal barrels. At present, the world's largest continuous countercurrent ion exchange plant is the Rosin uranium plant in Namibia, Africa. This factory was designed by Porter. The ion exchange system consists of a series of horizontal barrels connected in series with each other, each horizontal barrel serving as an effective fluidized bed. The resin transfer between each barrel is lifted by air and the resin is countercurrent to the solution. The plant processes 3,500 m 3 of uranium solution per hour. Each barrel has a cross-sectional area of ​​6 m 2 (diameter 2.76 m) and a depth of 3.5 m. The baud fluidized bed ion exchange system is shown in Figure 1.
Figure 1 Porter fluidized bed system
The multi-tower series fluidized bed designed by the Nuclear Industry Six is ​​also about to be put into operation. The single tower of the equipment adopts a clear liquid hydraulic suspension bed structure, and the bottom is provided with a tube liquid, and a special device for preventing the resin from clogging the overflow pipe is considered at the top. The tower is Φ2m×4.65m three-column series adsorption, one tower is rinsed. The adsorption and leaching are carried out in the same column, that is, the resin is not transferred, similar to the switching operation of the fixed bed, but the fluidized bed resin has a small input amount, a large amount of treatment, and can handle a certain solid content. The system has a design processing capacity of 50-60 m 3 /h containing uranium solution, and the uranium concentration is 30-80 mg/L.
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