Study of the Kroll-process to produce ultra-pure Ti for the low background experiments
Study of the Kroll-process to produce ultra-pure Ti for the low background experiments
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DOI：
10.1063/1.4927986
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发表时间：
2015-08
期刊：
影响因子：
4
通讯作者：
E. Mozhevitina;A. Chepurnov;A. Chub;I. Avetissov;V. Glebovsky;S. Nisi;M. Vacri;Y. Suvorov
中科院分区：
文献类型：
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作者：
E. Mozhevitina;A. Chepurnov;A. Chub;I. Avetissov;V. Glebovsky;S. Nisi;M. Vacri;Y. Suvorov
为了构建直接寻找暗物质的G2和G3低背景实验，将需要大量的超纯建筑材料。我们对各种Ti样品的研究表明，商业上可获得的工业Ti的污染水平可以从0.2到100 mBq/kg不等。这意味着，如果能够开发出污染水平极低（低于1 mBq/kg的238U /232Th）的批量生产方式，金属Ti将是未来实验中非常有前途的材料。我们对工业Kroll过程的研究主要集中在U和Th的可能来源及其在多阶段Kroll过程中的迁移。为了了解U和Th在Kroll过程中的迁移，我们研究了ICP-MS精确分析的其他杂质集。初步结果证实，Kroll工艺可用于制备超纯海绵钛，而从海绵钛中制备具有必要力学性能的金属钛的后续阶段还需要进一步研究。
To construct G2 & G3 low background experiments for direct Dark Matter search, a lot of ultra-pure construction materials will be needed. Our study of various Ti samples shows that the levels of contaminations of commercially available industrial Ti can varies from 0.2 to 100 mBq/kg for U/Th. It means that the metal Ti is such a promising material for future experiments if the way of production in bulk quantities with very low level of contaminations (below ∼1 mBq/kg of 238U /232Th) would be developed. Our study of the industrial Kroll-process is focused on the possible sources of U and Th and their migration during the multistage Kroll process. To understand migration of U and Th during the Kroll process the set of other impurities available due to precise ICP-MS analysis have been studied. Preliminary results confirm that the Kroll process could be used for the ultra pure Ti sponge production while the following stages of the metal Ti production of from the Ti sponge with necessary mechanical properties need to be additionally studied.