响应曲面法优化碳分法回收碱浸后液中铝的研究

Study on the Recovery of Aluminum from Sodium Metaaluminate Solution by Carbon Separation Optimized by Response Surface Methodology

采用碱法回收失效催化剂会产生高浓度偏铝酸钠溶液,此浸出液因铝含量较高且杂质较少,具有显著的回收价值。本文采用碳分法使偏铝酸钠转化为氢氧化铝沉淀,从而实现铝的回收。利用响应曲面法研究CO_(2)的通气速率、通气时间、稀释倍数三个工艺参数对Al(OH)_(3)沉淀转换率的影响显著性,探究Al(OH)_(3)沉淀的最佳工艺参数。结果表明:在CO_(2)通气速率为0.360 L/min、通气时间为116 min、稀释倍数为4倍的条件下,Al(OH)_(3)沉淀转化率平均为98.59%。该沉淀过程属于多因素控制,其中通气时间及稀释倍数对Al(OH)_(3)沉淀转化率的影响较为显著。

High concentration sodium metaaluminate solution will be produced when invalid catalyst is recovered by alkali method. The leaching solution has significant recovery value because of its high aluminum content and less impurities. In this paper, sodium metaaluminate was converted into aluminum hydroxide precipitation by carbon separation to recover aluminum. Response surface methodology was used to study the significance of CO_(2)ventilation rate, aeration time and dilution ratio on the conversion rate of Al(OH)_(3)precipitation, and to explore the best process parameters of aluminum hydroxide precipitation. The results show that the average precipitation conversion rate of Al(OH)_(3)is 98.59% with the CO_(2)aeration rate of 0.360 L/min, the aeration time of 116 min, and the dilution ratio of 4 times. The precipitation process is controlled by many factors, among which the aeration time and dilution ratio have significant effects on the precipitation conversion of Al(OH)_(3).