Highly Efficient Recovery of Vanadium and Chromium: Optimized by Response Surface Methodology

[Image: see text] Response surface methodology was applied to optimize the processing parameters (dosage of NaOH, dosage of H(2)O(2), reaction temperature, liquid-to-solid ratio, stirring rate, and reaction time) that affected the leaching process of vanadium and chromium. The results indicated that the leaching process of vanadium was significantly affected by the dosage of NaOH and dosage of H(2)O(2) used in the experiments, whereas the processing parameters affected the leaching efficiency of chromium in the following order: dosage of H(2)O(2) (F) > reaction temperature (C) > dosage of NaOH (A) > reaction time (B) > stirring rate (D) > liquid-to-solid ratio (E). Almost 98.60% of vanadium and 79.82% of chromium were leached out during the leaching process.