废弃线路板尾渣选冶联合提纯新工艺

New process of combined beneficiation-metallurgy to purify waste printed circuit board tailing

采用"粉碎-重力分选-生物浸出"工艺对一种铜含量为0.93%的废弃线路板尾渣进行处理.结果表明,将废弃线路板尾渣深度粉碎到粒径小于0.1mm,经细粒摇床重选后,金属粉末中铜含量为60.21%,非金属粉末中铜含量为0.23%;采用T.f菌在25～35℃,浸出液pH=2的条件下,对非金属粉末浸出48h,浸出渣中铜含量降低到0.07%,浸出渣为纯化的玻纤树脂复合材料,是制备高性能塑料的优质原料;生物浸出液可通过萃取-电积工艺回收其中的铜,浸出溶液可循环使用.

Physical separation and biology leaching were used to treat a certain waste printed circuit board tailing with Cu content of 0.93%. The results indicated that when the waste printed circuit board tailing was crushed to less than 0.1 mm in particle size and then separated by slimer, Cu contents in metal powder and non-metal powder were 60.21 % and, 0.23% respectively. When the non-metal powder was leached for 48h at 25--35℃ by using T. f bacteria and when the pH value of leaching solution was 2, Cu content in leaching residue was reduced to 0.07 %. Leaching residue consisted of the purified fiberglass resin compos- ite material, which was the superior raw material for preparing high-performance plastics. The copper could be obtained by using extraction-electrodeposition process from the biology leaching solution, and the leaching solution could be recycled. Key words, waste printed circuit board tailing; depth crush; gravity separation; biology leaching; fiberglass resin composite materials