(1) metal electrically purity cerium Ce purified transition metal taken from the molten salt electrolysis can reach 99.8%, impurities are mainly iron, oxygen, carbon, and molybdenum. The metal crucible was re-melted to a length of about 160 mm and a rod having a diameter of about 13 mm. Then, in a sealed device with inert gas protection, the two ends are clamped on the water-cooled electrode head, and a direct current of 120V and 500A is applied to heat the metal crucible to (600±10) ° C (about less than the melting point of the crucible). 200 ° C), the results of long-term electromigration refining are shown in Table 1. Practice has shown that the effective migration of carbon impurities takes about 100h, while the iron is about 50h.
           Table 2 Contents of impurities in metal ruthenium before and after electromigration refining Unit: μg/g
Impurity element | a uniform rod before refining | Middle section of the rod after refining | Impurity element | a uniform rod before refining | Middle section of the rod after refining |
C O 2 Fe Cu Mo | 400 50 1300 120 400 | 140 350 30 40 440 | Al Ca Mg Si | 500 20 10 250 | 200 10 40 70 |
(2) Electromigration purification of other rare earth metals Due to the difference in melting point, electrical conductivity, and U/D value of each rare earth metal, the process conditions required for electromigration are also different. Table 2 lists electromigration. yttrium, gadolinium, terbium, lutetium, neodymium, process conditions and purification effect.
Table 2 Process conditions and purification effects of electromigration purification of rare earth metals
element | atmosphere | Temperature / °C | Time / h | Original test bar impurity content (μg / g) | Impurity content after purification (μg/g) | ||||
C | N | O | C | N | O | ||||
Y Y Gd Gd Tb Lu Nd | Argon 1.3×10 -5 Pa Helium Ultra high vacuum Ultra high vacuum Ultra high vacuum Ultra high vacuum | 1370 1175 1245 1100 1050 1150 860 | 200 190 150 310 350 168 1237 | - 100 twenty three 1000 - 70 13 | 510 10 28 4 30 15 54 | 3330 25 81 500 380 475 45 | - 120 2 8 - 60 - | 75 8 0.5 15 6 1 | 340 60 6 11 25 42 16 |
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