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Preparation and Aqueous Durability of Sr Incorporation into Rutile TiO_2
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| 【文章作者】张魁宝;WEN Guanjun;YIN Dan;ZHANG Haibin; |
| 【文章摘要】 TiO_2 was employed as the waste form for disposal of simulated nuclide Sr. Preparation of Sr bearing rutile was explored under different sintering temperatures and Sr contents. The optimal treatment temperature was confirmed as 1300 ℃ for the incorporation of SrO in rutile Ti O_2. Perovskite type Sr TiO_3 was prepared as the resultant product. The limited containment capacity of SrO in rutile was speculated to be 56.5wt%. As the SrO content increases, the as-synthesized sample exhibits more porosity because Sr TiO_3 phase demonstrates higher density than rutile and SrO. The 28 day normalized leaching rate(LRi) of Sr and Ti will decrease congruously as the SrO incorporation increases. The LRSr value is lower than 0.1g·m~(-2)·d~(-1), which is about 3 orders of magnitude higher than the LR_(Ti) value. |
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