防辐射功能集料及其焙烧机理研究

Study on Radiation Shielding Function Aggregate and its Calcination Mechanism

借鉴人工轻集料的制备方法,将含重金属Ba的钡盐厂废弃污泥烧制成具有射线屏蔽功能的防辐射功能集料(RSFA),并考察不同污泥含量和不同配料n值条件下功能集料的密度、力学性能和屏蔽性能变化规律,通过X射线衍射分析和傅立叶红外光谱分析探讨功能集料的焙烧机理。研究显示:功能集料中合适的BaO含量为8%-12%;n值为3.16-4.55;在此条件下煅烧出的功能集料抗压强度可达60 MPa;表观密度在2.0 g/cm3以上;对γ射线的线性衰减系数可达0.19 cm-1。

Using the preparation method of artificial lightweight aggregate, the waste sludge containing heavy metal Ba from barium salt factory is roasted to the radiation function aggregate （RSFA）, which has the ability of radiation shielding, and the effect of different sludge concentrations and different n values on its density, mechanical properties and shielding properties is studied, and also the roasting mechanism by XRD and FTIR is analyzed. The study shows that the appropriate BaO content is 8% ～12%, and n values is between 3.16 to 4.55. Under this condition, compressive strength of RSFA can be up to 60 MPa, and the apparent density is above 2 g/cm3, and linear attenuation coefficient to 7 ray is more than 0.19 cm^-1.