Abstract
This paper emphasizes the recovery of filler materials from bauxite mining waste by leaching iron oxides (Fe2O3). A combination of oxalic acid and hydrochloric acid is employed synergistically to facilitate the removal of iron oxides (Fe2O3) via the leaching process. Through optimization of the leaching process for iron oxide, it was determined that employing 2 M HCl along with 0.5 M oxalic acid at a temperature of 70°C for 240 minutes yielded a maximum iron removal efficiency of 64.32%. The resulting leached product met the standards outlined by the Bureau of Indian Standards (BIS) for utilization as a filler material. Kinetic investigation utilizing the shrinking core model revealed that the iron leaching process was primarily governed by a reaction step characterized by an activation energy (E) of 17.02 kJ/mol. Economic analysis indicated a return on investment of 523.65%, underscoring the profitability of the process for producing filler material from mining waste, which has the potential to generate substantial profits in the long run.
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