<p>This paper highlights the recovery of high-quality materials from bauxite mining waste. Oxalic acid is used to remove iron oxides (Fe₂O₃) by leaching process. The leaching process for Fe₂O₃ was thoroughly optimized by carefully controlling the oxalic acid concentration, temperature, and extraction time. The variables were systematically adjusted within the ranges of 0.5–2M for acid concentration, 50–80°C for temperature, and 30–240 minutes for extraction time. The optimized conditions for leaching with oxalic acid are 1.5 molar at 70°C and 210 min with removal of iron oxide was 65.18%. These conditions represent the pinnacle of efficiency, ensuring maximum Fe₂O₃ removal from the waste material. The apparent activation energy is 18.36 KJmol^-1 and 35.38 KJmol^-1 for Chemical reaction model and Diffusion model for the Oxalic acid Leaching (shrinking core model). A robust statistical design, known as Box-Behnken, was rigorously implemented using Minitab to enhance and optimize the process. The product obtained from PLK rock is a highly valued material for filler industrial applications like textile, paper, rubber, ceramic, filler, paint, and refractory industries.</p>