June 02, 2020

Purification of rare earth metals by regional melting method - application examples

After the metal impurity content of lanthanum, cerium, gadolinium, terbium purified by zone melting as shown in Table 1. The gas impurities H, O, and N in the table were analyzed by vacuum melting, and the metal impurities were analyzed by mass spectrometry. After the melt purification in the zone, the content of impurities in the beginning, middle and end of the test bar changed significantly. O and N move in the opposite direction of the melt zone motion and are enriched at the beginning of the sample. The direction of movement of the metal impurities is consistent with the direction of the melt zone movement, and most of it is concentrated at the end of the sample.
Table 1 Impurity content of molten metal in the lanthanum, cerium, lanthanum and cerium regions
metal
position
H
O
N
La
Tb
Y
Cu
Ni
Fe
Ti
Si
Al
Pb
S
Na
La
beginning
900
11829
690
15
30
75
31
5
in
759
7450
776
end
526
5248
204
3
10
160
100
0.3
Gd
beginning
17
933
39
6
10
4
2
40
1.5
32
15
7
in
17
596
twenty four
7.5
twenty three
6.5
3
49
3
49
95
20
end
17
341
14
20
60
65
65
190
8
65
450
26
Tb
beginning
13
1999
140
6.5
6.5
6.5
5
6
0.4
in
10
640
69
7
7
27
3
50
1
end
13
348
29
32
32
75
4
170
1.5

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