废锂电池配合-沉淀体系碱浸液中铝的回收

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

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^--CO_3^(2-),Me-OH^--NH_3,Me-OH^--NH_3-CO_3^(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^--CO_3^(2-)、Me-OH^--NH_3和Me-OH^--NH_3-CO_3^(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^--NH_3-CO_3^(2-)体系生成的Al(OH)3沉淀比Me-OH^--NH_3体系的Al(OH)3沉淀更易分离;含铁锰碱浸液Me-OH^--CO_3^(2-)、Me-OH^--NH_3和Me-OH^--NH_3-CO_3^(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。

To separate and recover Al from spent lithium batteries , three kinds of complexation-precipitation systems i.e., Me-OH-CO32-, Me-OH-NH3 and Me-OH-NH3-CO32-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-CO32-, Me-OH-NH 3 and Me-OH-NH3-CO32-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-NH 3-CO 32-system was easier to be separated than that in Me-OH-NH 3 system;For Fe-Mn-containing alkali-leaching solution , the Al removal rates of Me-OH-CO 32-, Me-OH-NH3 and Me-OH-NH 3-CO32-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.