废旧线路板中主要有价金属的生物反应器浸出研究

为探讨可供实际生物浸出应用的反应器规模废旧线路板中有价金属浸出特性和工艺条件,通过设计序批式生物浸出反应器,采用分离到的氧化亚铁硫杆菌Z1作为菌种资源,在考察废旧线路板中有价金属的浸出特性的基础上,确定了反应器运行的最佳工艺条件.结果表明,反应器运行的最佳工艺条件为曝气量1L/min、停留时间30h、搅拌速率300r/min以及粉末投加量12g/L.在此条件下,经过101h可以浸出90.24%的铜.同时,经197h的浸出,可以溶出93.06%的镁、92.00%的锌、85.59%的铝和64.51%的镍.因此,生物浸出反应器能有效回收废旧线路板中的有价金属,为该技术的实际应用提供了实验证据.

Study of bioreactor for mainly valuable metals recovery from waste printed circuit boards

To explore the bioleaching characteristics and process conditions of valuable metals in bioreactor which from waste printed circuit boards so as to promote the practical application of bioleaching technology, the designed batch mode bioleaching reactor and was used and strain Thiobacillus ferrooxidans Z1 was isolated, the optimum operation conditions of bioreactor was determined on the basis of investigation of bioleaching characteristics of valuable metals from waste printed circuit boards. The results showed that the optimum operation conditions of the reactor was: aeration rate 1L/min, retention time 30h, stirring speed 300r/min and powder dosages 12g/L. Under the conditions, 90.24% copper leaching efficiency was achieved in 101h. Meanwhile, 93.06% of magnesium, 85.59% of zinc, 85.59% of aluminium and 64.51% of nickel was bioleached in 197h, respectively. Therefore, the bioleaching reactor can effectively recover valuable metals in the waste printed circuit boards, which provided experimental evidence for the practical application of the technology.