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›› 2011, Vol. 11 ›› Issue (6): 984-989.

• 反应与分离 • 上一篇    下一篇

铬渣中无定型铝泥碱浸提铝动力学

田磊 徐志峰 李平 徐红彬 张懿   

  1. 中国科学院过程工程研究所 江西理工大学材料与化学工程学院 中国科学院过程工程研究所 中国科学院过程工程研究所绿色过程与工程重点实验室 中国科学院过程工程研究所
  • 收稿日期:2011-09-15 修回日期:2011-11-10 出版日期:2011-12-20 发布日期:2011-12-20
  • 通讯作者: 田磊

Alkali Leaching Kinetics of Amorphous Aluminum Hydroxide Mud in Chromium Hydroxide Residue for Aluminium Recovery

TIAN Lei XU Zhi-feng LI Ping XU Hong-bin WANG Shao-na   

  1. Institute of Process Engineering,Chinese Academy of Sciences Falculty of Material and Chemical Engineering, Jiangxi University of Science and Technology Institute of Process Engineering,Chinese Academy of Sciences Institute of Process Engineering, Chinese Academy of Sciences Institute of Process Engineering, Chinese Academy of Sciences
  • Received:2011-09-15 Revised:2011-11-10 Online:2011-12-20 Published:2011-12-20
  • Contact: TIAN Lei

摘要: 以含Cr(OH)3和Al(OH)3的铝泥渣为原料,研究渣中Al(OH)3在343~373 K温度内的碱浸动力学. 结果表明,在NaOH溶液初始浓度150 g/L、液固比15 mL/g、搅拌转速450 r/min条件下,在浸出达到平衡前,铝浸出率与浸出时间呈良好的线性关系,随温度升高,铝浸出达到平衡所需时间不断缩短;在343~373 K内,铝浸出速率随浸出温度升高不断增大,最终可达94.07%,所得氧化铬产品中氧化铬的含量为98.12%. Cr(OH)3渣中铝浸出反应的表观活化能为62.38 kJ/mol,浸出过程遵循界面化学反应控制的粒径收缩芯模型.

关键词: 氢氧化铬渣, 氢氧化铝, 浸出, 动力学,

Abstract: With the aluminum residue containing chromium hydroxide [Cr(OH)3] and aluminum hydroxide [Al(OH)3] as raw material, the alkali leaching kinetics of Al(OH)3 in the residue has been studied in the following conditions: leaching temperature from 343 to 373 K, initial concentration of sodium hydroxide 150 g/L, ratio of liquid to solid 15 mL/g, and agitation speed 450 r/min. The experimental results show that a linear relationship between the leaching rate of aluminum and leaching time exits before the leaching equilibrium. The time consumed for which the leaching of aluminum reaches at the equilibrium is shortened with the increase of leaching temperature. The leaching rate of aluminum is increased with the increase of temperature in 343~373 K, finally the leaching rate of aluminum is 94.07%, leading to the main content of chrome oxide product at 98.12%. The apparent activation energy is determined as 62.38 kJ/mol for the leaching of aluminum. The leaching of aluminum follows the shrinking core model with surface reaction control.

Key words: chromium hydroxide residue, aluminum hydroxide, leaching, kinetics, aluminum

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