School of Urban Development and Environmental Engineering, Shanghai Second Polytechnic University, Shanghai, PR China.
Waste Manag Res. 2012 Nov;30(11):1145-50. doi: 10.1177/0734242X11433532. Epub 2012 Mar 27.
The effect of calcium-based addition on the brominate flux during printed circuit board (PCB) pyrolysis was investigated. It was found that bromine (Br) can be effectively fixed in solid phase during PCB pyrolysis by adding calcium-based waste materials. Phenol and 4-ethylphenol are the major products of pyrolysis. When the two kinds of red mud were used as additive, their content was 85.25 and 84.81%, respectively, which was higher than others. The 2-bromophenol and 2-bromo-4-methyl-benzene are the main Br-containing pyrolysis volatiles. After adding calcium-based additive, these two volatiles were apparently reduced and only small amounts of 2-bromo-4-methyl-benzene were detected in the products, namely 0.71 and 0.86%, respectively for the two kinds of red mud. Hence, no matter from the perspective of product use or simple Br-fixing, the bromine in the three-phase products can be effectively regulated and controlled by adding calcium-based waste residue during PCB pyrolysis. Finally, the Br-fixing mechanism was analysed. As a result, when calcium-based waste materials were added to the PCB pyrolysis it made bromine fix easily in the resident yielding a byproduct that can be further used.
研究了钙基添加剂对电路板（PCB）热解过程中溴化物通量的影响。研究发现，通过添加钙基废料，溴（Br）可以在 PCB 热解过程中有效地固定在固相相中。热解产物主要为苯酚和 4-乙基苯酚。当两种赤泥用作添加剂时，其含量分别为 85.25%和 84.81%，高于其他两种。2-溴苯酚和 2-溴-4-甲基苯是主要的含 Br 热解挥发物。添加钙基添加剂后，这两种挥发物明显减少，在产物中仅检测到少量的 2-溴-4-甲基苯，分别为 0.71%和 0.86%。因此，无论是从产品用途还是简单的 Br 固定角度来看，通过在 PCB 热解过程中添加钙基废渣，都可以有效地调节和控制三相产物中的溴。最后，分析了 Br 固定机制。结果表明，当钙基废料添加到 PCB 热解中时，溴很容易固定在残渣中，生成一种可以进一步利用的副产物。
