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以含Cr(OH)3和Al(OH)3的铝泥渣为原料,研究渣中Al(OH)3在343～373K温度内的碱浸动力学.结果表明,在NaOH溶液初始浓度150g/L、液固比15mL/g、搅拌转速450r/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343～373K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62.38kJ/mol,浸出过程遵循界面化学反应控制的粒径收缩芯模型.
The alkaline immersion kinetics of Al (OH) 3 in slag at 343 ~ 373K was studied by using aluminum sludge containing Cr (OH) 3 and Al (OH) 3 as raw materials.The results showed that when NaOH solution initial concentration was 150g / L, the liquid-solid ratio of 15mL / g and stirring speed of 450r / min, the leaching rate and the leaching time showed a good linear relationship before the leaching reached equilibrium. With the increase of the temperature, the leaching time of aluminum leaching was shortened. In the range of 343 ~ 373K, the leaching rate of aluminum increased with the increase of leaching temperature and finally reached 94.07%, and the content of chromic oxide in the obtained chromium oxide was 98.12% .Characteristics of aluminum leaching reaction in Cr (OH) 3 slag The activation energy was 62.38kJ / mol, and the leaching process followed the particle size shrinkage core model controlled by interfacial chemical reaction.