Before introducing NIM equipment, it is necessary to introduce the C-S ion exchange equipment (see Figure 1) invented by Cloete and Streat of the Imperial University of London, UK, both of whom were from 1961. The study began with an ion exchange column using double-layer trays. The two trays are very close together, and the openings of the two trays are staggered from each other. When the liquid inlet suddenly stops, the resin of each exchange chamber can stay on the tray, the operation is relatively stable, and it is not easy to mess with the bed. In 1967 they obtained a British patent.
Figure 1 Schematic diagram of C-S ion exchange tower
South African National metallurgical research findings so C-S ion exchange column as a starting point to study the multi-stage fluidized bed. In 1971 and 1972, patents were obtained for the design and control of resin retention in trays.
In the second half of 1975, a multi-stage fluidized bed for the recovery of uranium from gold mine leachate was designed. Its structural characteristics:
First, the adsorption tower diameter: 2.5m
Second, the tray spacing: 1m
Third, the opening aperture of the tray: 12mm
Fourth, the plate opening rate: 2%
5. In addition to the bottom tower section, the remaining sections are separated by simple perforated plates, and the bottom tower section trays are provided with liquid caps to control the amount of resin retained and the amount of resin transferred.
6. When the saturated resin is discharged, it first enters the resin transfer bin, and the water pressure is increased. The top of the tower was dewatered with a Φ1.22m rotating sieve, and a 50 mesh stainless steel mesh was laid on it.
The effect achieved:
The uranium concentration of the leaching solution into the tower was 200mg/L, and the tail liquid was reduced to ~1mg/L after adsorption. The monthly measured data of resin loss after 17 months of operation was 0.25%. The cloth is even and stable. The resin retention of each exchange chamber was basically the same under a certain flow rate condition, and the operation was normal for 17 months of continuous operation.
On the basis of the successful operation of the 2.5m diameter tower for 17 months, a large tower with a diameter of 5.5m was designed. The total height of the tower is 30m, which is also used to recover uranium from gold mine leachate.
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