通过添加CuO催化剂来提高铬铁矿在KOH亚熔盐介质中的浸出率.研究反应体系温度、碱矿质量比,铜矿质量比和气体流速对铬浸出的影响.结果表明:CuO对提高铬铁矿在KOH亚熔盐介子的浸出率起着十分重要的作用.在反应温度为230℃、碱矿质量比为6:1、搅拌转速为700 r/min、气体流速为1 L/min、反应时间为6 h的条件下铬的转化率在添加CuO时为98%,而未添加CuO时,铬的转化率仅为60.8%.动力学计算结果表明,添加CuO后在反应温度高于230℃ 时,反应速度控制步骤为表面化学反应控制,反应活化能为15.79 kJ/mol;未添加CuO时,反应速度控制步骤为外扩散控制,反应活化能为38.01 kJ/mol.
CuO was used as a catalyst in the concentrated KOH solution to enhance the leaching of chromium from the chromite ore. The impacts of temperature, KOH-to-chromite ore mass ratio, CuO-to-chromite ore mass ratio, and gas flow rate on the chromium leaching rate were investigated. The results indicated that CuO played an important role in improving the chromium leaching rate. The leaching rate reached 98% after leaching for 6 h when CuO was applied, whereas it was only 60.8% without CuO under the same reaction conditions: temperature 230 ℃, KOH-to-ore mass ratio 6:1, stirring speed 700 r/min, gas flow rate 1 L/min. According to the kinetics study, the catalytic oxidation was controlled by surface chemical reaction and the activation energy was calculated to be 15.79 kJ/mol when the temperature was above 230 ℃. In contrast, without CuO, the rate-determining step was external diffusion and the apparent activation energy was 38.01 kJ/mol.
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