废锂电池配合-沉淀体系碱浸液中铝的回收

为分离回收废锂电池中的铝,在含铁及含铁锰的两种碱浸液中构建了金属（Me）-OH^--CO₃^2-,Me-OH^--NH₃,Me-OH^--NH₃-CO₃^2-三种配合-沉淀体系,分析了三种体系在不同pH条件下的铝去除率和Al（OH）₃沉淀中的铁及铁锰含量。实验结果表明：含铁碱浸液在pH为8.0~10.0的适宜条件下,Me-OH^--CO₃^2-、Me-OH^--NH₃和Me-OH^--NH₃-CO₃^2-体系的铝去除率分别高达99.4%、99.7%和99.6%,Al（OH）₃沉淀中含少量铁,Me-OH^--NH₃-CO₃^2-体系生成的Al（OH）₃沉淀比Me-OH^--NH₃ 体系的Al（OH）₃沉淀更易分离;含铁锰碱浸液Me-OH^--CO₃^2-、Me-OH^--NH₃和Me-OH^--NH₃-CO₃^2-体系的铝去除率分别高达99.4%,99.7%和99.9%,Al（OH）₃沉淀中几乎不含锰,含有少量铁。

Recovery of aluminum from alkali-leaching solution of spent lithium batteries in complexation-precipitation systems

To separate and recover Al from spent lithium batteries,three kinds of complexation-precipitation systems i.e.,Me-OH^--CO₃^2-,Me-OH^--NH₃ and Me-OH^--NH₃-CO₃^2- were constructed in two alkali-leaching solutions containing either Fe or both Fe and Mn,respectively. The Al removal rate and the contents of Fe or Fe-Mn in the precipitate of Al（OH）₃ for the three complexation-precipitation systems were analyzed under different pH condition. The experimental results showed that：For Fe-containing alkali-leaching solution,the Al removal rates of Me-OH^--CO₃^2-,Me-OH^--NH₃ and Me-OH^--NH₃-CO₃^2- system achieved 99.4%,99.7% and 98.0% respectively under the optimum condition of solution pH 8.0-10.0,and only a slight amount of Fe was found in the Al（OH）₃ precipitate,meanwhile,the Al（OH）₃ precipitate in Me-OH^--NH₃-CO₃^2- system was easier to be separated than that in Me-OH^--NH₃ system;For Fe-Mn-containing alkali-leaching solution,the Al removal rates of Me-OH^--CO₃^2-,Me-OH^--NH₃ and Me-OH^--NH₃-CO₃^2- system reached 99.4%,99.7% and 99.9%,respectively,and little Mn and a small amount of Fe were contained in the Al（OH）₃ precipitate.