The presence of hexavalent chromium in dangerous concentrations in mine wastewater poses a great danger to the environment and to people highlights the importance of the development of technology in wastewater treatment. This study focused on the simulation of a fixed-bed adsorption column of lateritic soil and water wherein the relationships of porosity with that of the adsorption rate and capacity, and the estimated time of saturation was investigated through the COMSOL Multiphysics. It was found that the rate of adsorption and estimated time of saturation of the laterite filtration bed was faster as the porosity of the material increased. It was also observed that lower porosities have higher maximum adsorption concentrations which occur near the inflow of the column. Moreover, it was found that the concentration of adsorbed species increases exponentially with respect to time at the onset of adsorption. Further studies involving lab-scale experimentation, filtration column fabrication, and desorption mechanism are recommended to be able to create a product for actual industry applications.