The production of high-purity aluminum in Japan |
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Authors: | Mitsuhiro Kondo ME Hideo Maeda BE Mikio Mizuguchi ME |
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Affiliation: | 1. Tsukuba Research Laboratory at Sumitomo Chemical Co., Ltd., New Zealand 2. Ehime Research Laboratory at Sumitomo Chemical Co., Ltd., New Zealand 3. Ehime Works, Sumitomo Chemical Co., Ltd., New Zealand
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Abstract: | The two most widely industrialized techniques for aluminum refining are the three-layer electrolytic refining process and the segregation process. The three-layer process uses molten salt electrolysis to produce aluminum of greater than 99.99% purity. The segregation process produces aluminum of 99.98–99.99% purity. Although aluminum refined by the segregation process has a somewhat lower purity than that produced by the other methods, the segregation process has become increasing common since it consumes less energy. Ultrahigh-purity aluminum (99.9999%), which has uranium and thorium impurities reduced to less than 1 ppb, can also be produced. |
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