X-ray tomography scan of partially dewatered filter cake

X-ray tomography image of a partially dewatered filter cake. The initial slurry contains Al2O3 particles suspended in a potassium iodide-glycerol solution, which were separated by cake-forming filtration with subsequent dewatering. All filtration and dewatering experiments took place in an in situ apparatus within the Zeiss Xradia 510 X-ray microscope. The filter cake is dewatered by gradually increasing the pressure. A scan is taken in the equilibrium state after one pressure step. The data set contains seven pore filling grades S1-S7 (= seven pressure steps).