作　　者： ; ; ;

机构地区： 华南理工大学环境科学与工程学院

出　　处： 《环境工程学报》 2009年第5期902-906,共5页

摘　　要： 根据废弃印刷线路板中材料密度不同，采用水介质流化床对印刷线路板粉末中的金属进行回收，对0．25—0．177、0．177～0．104、0．104～0．074和一0．074mm4个粒级范围内的物料进行分选试验。试验结果表明，在上述4个粒级范围内，随介质流速的增大，金属回收率降低；金属回收率叩与实际操作速度（u。）和颗粒终端沉降速度（u1）的比值妒（ua／u1）存在一定线性关系，分析模拟了η与φ之间的相关性方程，外推试验的结果证明了相关性方程的可靠性；在合适的操作条件下，各粒级范围内金属的回收率分别为95．02％、90．07％、87．5％和92．68％。 Based on the density difference of metals and nonmetals, a liquid-solid fluidized bed was used to recover metals from printed circuit board （PCB） which was milled and separated into four size fractions ： 0.25 - 0. 177,0. 177 -0. 104,0. 104 -0. 074, -0. 074 mm. The results showed that metal recovery decreased as the operation velocity increased. There exists a linear relationship between metal recovery （η） and the ration of operation velocity u~ and terminal settling velocity ut （φ）, and correlation equations were developed to predict the metal recovery at different operation velocity. Extrapolation experimental results verified the reliability of the equations. Metal recovery of each size fraction are 95.02% ,90.07% , 87.5% and 92.68% respectively under optimal operation conditions.

关 键 词： 印刷线路板 分选 液 固流化床 金属回收率

领　　域： [环境科学与工程]