Study on Radiation Shielding Function Aggregate and its Calcination Mechanism

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 γ ray is more than 0.19 cm-1.