Accelerating Rate of Vaporization of Heavy Metals due to Co-combustion of Waste Plastics in Ash Melting Furnace

概要

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During field trials using ash melting furnaces at a commercal plant and test plant, it was observed that a higher rate of mixing of combustibles reduces the lead concentration in molten slag. Rigorous laboratory experimentation was carried out to ascertain the correlation between various parameters such as the rate of mixing of plastics, the rate of mixing of fly ash and the rate of vaporization of heavy metals. The rate of mixing of fly ash has a strong influence on the rate of vaporization of lead and cadmium. Mixed plastics promote vaporization of lead and cadmium from the ash quite significantly when the rate of mixing of fly ash is in the lower range. As one of the most critical regulatory values for the recycling of molten slag, lead content (<150 mg/kg) was measured with method #19 as per the law regarding soil contamination. In this laboratory experimentation, the co-combustion of waste plastics with ash has resulted in a significant reduction of lead concentration in molten slag as per method #19. These facts suggest that the utilization of waste plastics in an ash melting furnace is an effective measure to control the quality of slag for recycling and can be regarded as "chemical recycling of waste plastics".