新型防辐射水泥结构配位与多元屏蔽性能研究

Along with the rapid development of nuclear reactor technology, the nuclear safety issues become increasingly serious, then the study and application of radiation-shielding cement develop extensively. In addition to the general functions of building materials, radiation-shielding cement should have the functions of shielding neutron-radiation and γ, X rays which is more important. However, the single radiation-shielding effect, poor thermal stability, and low gelling efficiency and other problems become the main bottleneck of restricting the promotion and application of this technology. This project with the clinker minerals of new-type radiation-shielding cement as research object, utilizing the law of coordination polyhedron and its connection mode in crystal, use the combination methods of XPS, EPR, XRD and EBSD, to reveal the physical and chemical properties of crystal structure of radiation-shielding materials; explore the inner link between coordination crystal structure of clinker mineral and its radiation-shielding properties under different temperature conditions; and look for the best thermal system. The B element with good effect of shielding neutron and Ba, Sr and other heavy metal elements with obvious effect of shielding γ, X rays are dissolved into the crystal structure of cement clinker minerals by calcining at high temperature to lay the theoretical and technical basis for the preparation of the new-type radiation-shielding cement clinker with steady coordination structure, superior multivariate radiation-shielding performance, and good thermal stability in one. The preliminary experiment has got the structure of mineral which contains B element (no report in literature, see novelty retrieval report).

随着核反应堆技术的迅猛发展，核安全问题日趋严峻，防辐射水泥的研制和应用随之广泛发展起来。防辐射水泥除要具有建筑材料的一般功能外，更重要的是要具有防中子辐射和γ、X射线的功能。然而，防辐射效果单一、热稳定性差、胶凝效率低等问题成为制约该项技术推广应用的主要瓶颈。本项目以新型防辐射水泥熟料矿物为研究对象，利用晶体中配位多面体及其连接方式的规律，采用XPS、EPR、XRD与EBSD相结合的方法，揭示防辐射材料晶体结构的物理和化学特性，探讨不同温度条件下熟料矿物配位晶体结构与其防辐射性能的内在联系，寻找最佳热工制度。将防中子效果好的B元素及屏蔽γ、X射线效果明显的Ba、Sr等重金属元素，经高温煅烧固溶于水泥熟料矿物结构中，为制备出集配位结构稳定、多元防辐射性能优越、热稳定性好于一体的新型防辐射水泥熟料奠定理论和技术基础。前期实验已获得含B元素的矿物结构 (未见文献报道，见查新报告)。

随着核反应堆技术的迅猛发展，核安全问题日趋严峻，防辐射水泥的研制和应用随之广泛发展起来。然而，防辐射效果单一、热稳定性差、胶凝效率低等问题成为制约该项技术推广应用的主要瓶颈。本项目以新型防辐射水泥熟料矿物为研究对象，将B、Ba等防辐射元素，经高温煅烧分别固溶于水泥熟料矿物的晶体结构中，通过XRD测试、中子屏蔽吸收性能测试等分析方法，确定防辐射元素的合理掺量范围，并利用晶体中配位多面体及其连接方式的规律，揭示防辐射水泥熟料矿物晶体结构的物理和化学特性，探讨防辐射水泥熟料矿物配位晶体结构与其防辐射性能的内在联系，为制备出集配位结构稳定、多元屏蔽性能优越、热稳定性好于一体的新型防辐射水泥熟料奠定了理论和技术基础。