熔融盐对印刷线路板热解影响实验研究

在固定床反应器中进行热解实验，考察不同热解终温、不同熔融盐添加量下印刷线路板热解过程中碳的气相转化率，并对热解液体和固体产物进行特性分析。结果表明,熔融盐的存在可以明显提高热解过程碳的气相转化率，减少液体产物产率。在未添加熔融盐的条件下，热解终温900℃时，碳的气相转化率为35.94%，液体产物产率为28.29%。添加 (71%Na2CO3-29%K2CO3) 熔融盐后，热解终温700℃时，碳的气相转化率为40.76%,液体产物产率为22.34%。添加 (8.3%Na2CO3-91.7%NaOH) 熔融盐后，碳的气相转化率达到59.36%，液体产物产率减少为6.88%。元素分析结果表明，熔融盐的存在可以减少固体残渣中的含碳量，而液体产物的H/C原子比为1.12～1.20。

Experimental study on the effect of eutectic salts on pyrolysis of waste printed circuit boards (PCB)

The pyrolysis process of printed circuit boards (PCB) under different temperatures and with different molten salts loading were studied with a vertical fixed bed reactor. The liquid products and solid products were analyzed. The result shows that the binary eutectic salts can decrease the liquid product yield. Consequently, the carbon conversion rate from PCB to gas products increases greatly. Without binary eutectic salts at 900℃ the liquid yield is 28.29%, and the carbon conversion rate from PCB to gas products is 35.94%. While at 700℃, with 71% Na2CO3-29%K2CO3, the liquid yield is 22.34%, and the carbon conversion rate from PCB to gas products increases to 40.76%. When changing the molten material to 8.3% Na2CO3-91.7%NaOH, the liquid yield decreases to 6.88%, and the carbon conversion rate to gas phase reaches 59.36%. The ultimate analysis result shows that carbon in the solid products decreases while adding eutectic salts, and the H/C ratios of liquid products are between 1.12 and 1.20.