Experimental Study of Thermal Plasma Processing Waste Circuit Boards

Abstract:

This study aimed to that waste circuit boards in batches were incinerated by thermal plasma. Firstly, the working principle of plasma incinerator and the exhaust gas treatment main process were introduced, then, the experimental results was analyzed and discussed. Due to the thermal plasma processing waste incineration furnace has high temperature (1200 0C above), all the organic ingredients in waste circuit boards, including dioxin, can be decomposed completely in a few milliseconds, no showing the secondary pollution and no producing furans and other carcinogens. In addition, after main exhaust gas (CO, NO) concentration change with time was carefully tracked, it was found that a large amount of CO gas was produced and NO gas concentration was within national safety limits during experiment. Although 44.4 kg sample was incinerated, more than 1 kg of small pieces of metal like Copper was obtained from the cooling molten slag. Finally, it was obvious that the volume and weight of molten slag was far less than the ones of sample. The experimental result has important practical significance for protecting the environment, obtaining more CO gas resource and retrieving a variety of rare metals (such as Gold, Copper, Silver, Platinum, etc.).

• Periodical: Advanced Materials Research (Volumes 652-654)
• Pages: 1553-1561
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.652-654.1553
• Online since: January 2013
• Authors: Song Bai Wang, Chang Ming Cheng, Wei Lan, Xian Hui Zhang, Dong Ping Liu, Si Ze Yang
• Keywords: DC Plasma Torch, Discarded Circuit Boards, Incinerator, KM-940 Hand-Held Gas Analyzer, Medium Frequency Inverter Switching Power Supply

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