Thermal treatment has been proved as an efficient and promising method for LCD panel scraps pre-treatment and resource recycling. However, undesirable pollutants including polycyclic aromatic hydrocarbons (PAHs) and heavy metals tend to occur during the thermal treatment. To better understand the metals migration behavior and to illustrate the interaction effect between organics and metals, effect of the polarizer on the metals (Cr, In, Ni, Cu, Zn, Fe) migration and transformation behaviors was analyzed in this study. Results showed that polarizer, the main organic component in LCD panel, could enhance the metals migration behavior during the thermal treatment and also affect the metals speciation distribution in solid residue. The enhancement effect on metals migration rate was mainly deduced by the gas/volatile compounds from polarizer decomposition, while the metals speciation distribution in solid residue was mainly affected by the solid product from polarizer decomposition. The polarizer also showed increase effect on the potential risk of In, Cu and decrease effect on Fe in solid residue. The results suggest that reducing the organics content or adding solid carbon in treatment system would helpful to decrease the metals migration during thermal treatment process of discarded LCD panels.

热处理已被证明是液晶面板废料预处理和资源回收的一种有效且有前景的方法。然而，在热处理过程中往往会产生不良污染物，包括多环芳烃 (PAH) 和重金属。为了更好地理解金属迁移行为并说明有机物和金属之间的相互作用，本研究分析了偏振片对金属（Cr、In、Ni、Cu、Zn、Fe）迁移和转化行为的影响。结果表明，偏光片是液晶面板中的主要有机成分，可以增强热处理过程中的金属迁移行为，也会影响固体残留物中的金属形态分布。对金属迁移率的增强作用主要是由偏光片分解产生的气体/挥发性化合物引起的，而固体残留物中金属形态分布主要受偏光片分解产生的固体产物的影响。偏光片还显示出对固体残留物中 In、Cu 潜在风险的增加作用和对 Fe 的降低作用。结果表明，在处理系统中降低有机物含量或添加固体碳有助于减少废弃液晶面板热处理过程中的金属迁移。