UO_2-Gd_2O_3芯块制造中添加阿克蜡的工艺条件及实验验证
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摘要
提出了在UO_2-Gd_2O_3芯块制造中,采用阿克蜡(Acrawax C,AKL)代替硬脂酸锌(ZnSt)作为润滑剂的制造工艺,研究了AKL添加方式及添加的AKL质量分数对含钆粉末混合均匀性、铀钆固溶行为、降密系数及杂质元素C含量的影响。结果表明:采用最终混料时添加AKL及人工清理混料器容器壁的操作工艺,可有效保证含钆粉末的混料均匀性,添加AKL对铀钆固溶行为没有影响;当AKL降密系数约为3、质量分数小于0.5%时,由AKL带入的杂质元素C能充分分解、挥发,随尾气排出,满足生产要求。验证实验表明:添加AKL后批量制备的UO_2-Gd_2O_3芯块可满足技术要求件,从而证明了该工艺的可行性。
The process using Acrawax C(AKL)instead of zinc stearate as lubricant in the manufacture of UO_2-Gd_2O_3 pellets is put forward.The effects of the adding method of AKL and the mass fraction of AKL on the mixed homogeneity of UO_2-Gd_2O_3 powder,the uranium-gadolinium solid solubility,the density reduction coefficient,and the content of carbon(C)are studied.The results show that the homogeneity of UO_2-Gd_2O_3 powder can be effectively guaranteed by adding AKL to the final mixture and manual cleaning of the container wall of the mixer.The addition of AKL has no effect on the uranium-gadolinium solid solubility(gadolinium clumps).When the density reduction coefficient of AKL in UO_2-Gd_2O_3 pellets is 3,and the mass fraction of AKL is less than 0.5%,the carbon content which brought by AKL can be disintegrated,volatilized and discharged with tail gas to meet the production requirements.The validation experiments show that the UO_2-Gd_2O_3 pellets prepared in batches after adding AKL meet the technical requirements.It proved that the process is feasible.
The process using Acrawax C(AKL)instead of zinc stearate as lubricant in the manufacture of UO_2-Gd_2O_3 pellets is put forward.The effects of the adding method of AKL and the mass fraction of AKL on the mixed homogeneity of UO_2-Gd_2O_3 powder,the uranium-gadolinium solid solubility,the density reduction coefficient,and the content of carbon(C)are studied.The results show that the homogeneity of UO_2-Gd_2O_3 powder can be effectively guaranteed by adding AKL to the final mixture and manual cleaning of the container wall of the mixer.The addition of AKL has no effect on the uranium-gadolinium solid solubility(gadolinium clumps).When the density reduction coefficient of AKL in UO_2-Gd_2O_3 pellets is 3,and the mass fraction of AKL is less than 0.5%,the carbon content which brought by AKL can be disintegrated,volatilized and discharged with tail gas to meet the production requirements.The validation experiments show that the UO_2-Gd_2O_3 pellets prepared in batches after adding AKL meet the technical requirements.It proved that the process is feasible.
引文
[1]吴根久,谭朝辉.阿克蜡在UO2芯块生产中的应用研究[J].机械研究与应用,2015,28(4):118-122.(WU Gen-jiu,TAN Chao-hui.Application research on Acrawax in UO2pellet production[J].Mechanical Research&Application,2015,28(4):118-122.)
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[2]全浩,韩永志.标准物质及其应用技术[M].北京:中国标准出版社,1991.(QUAN Hao,HAN Yong-zhi.Standard Substance and Application Technology[M].Beijing:China Standard Press,1991.)
[3]周荣生,邹从沛.大晶粒Gd2O3-UO2芯块制备研究[C]//第一届反应堆物理与核材料学术研讨会论文摘要集,2004.(ZHOU Rong-sheng,ZOU Cong-pei.The fabrication research of large grain Gd2O3-UO2 pellet[C]//Proc of 1st Seminar on Reactor Physics and Nuclear Material Science,2004.)
[4]蔡文仕,舒保华.陶瓷二氧化铀制备[M].北京:原子能出版社,1987.(CAI Wen-shi,SHU Bao-hua.Fabrication of Ceramic UO2[M].Beijing:Atomic Energy Press,1987.)
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