Calcium isotope separation by band chromatography using 18-crown-6-ether resin

Figures & data

Table 1. Experimental conditions of chromatographic Ca isotope separation

Experimental run no.	BC-1	BC-2	BC-3
Temperature (℃)	21	40	60
Bed height (cm)	97	98	97
Feed flow rate (ml/min)	0.4	0.4	1.0
Volume of feed Ca solution (ml)	44	48	68
Ca breakthrough volume* (ml)	104	103	93
Ca band velocity (m/d)	5.3	5.5	15
Sr Band velocity (m/d)	5.2	5.0	12.4
Ca/Sr band velocity ratio (-)	1.02	1.1	1.21

* The volume of effluent where the concentration reaches half of the feed concentration.

Figure 1. Distribution coefficient of Ca and Sr in adsorption on 18-crown-6-ether resin in 9MHCl.

Figure 2. Chromatogram of run BC-1 and calcium isotope separation in the Ca band.

Figure 3. Chromatogram of run BC-2 and calcium isotope profile in the Ca band.

Figure 4. Chromatogram of run BC-3 and calcium isotope profile in the Ca band.

Table 2. Results of chromatographic Ca isotope separation

Run no.	Temperature (℃)	Velocity (m/day)	Front ε ×10^3	Rear ε ×10^3	Average ε ×10^3	Front HETP (mm)	Rear HETP (mm)
BC-1	21	5.3	2.7 ± 0.4	2.7 ± 0.4	2.7 ± 0.4	7.8 ± 1.6	3.6 ± 0.7
BC-2	40	5.5	2.9 ± 0.4	3.1 ± 0.5	3.0 ± 0.5	6.6 ± 1.3	6.0 ± 1.2
BC-3	60	15	1.8 ± 0.3	2.1 ± 0.3	2.0 ± 0.3	4.0 ± 0.8	4.0 ± 0.8
Ref.10	*35	20	3.0 ± 0.1	-	-	8.3 ± 0.2	-
Ref.10	60	24	3.2 ± 0.5	-	-	3.1 ± 0.2	-

* The migration distance is 200 m