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Chlorination-Volatilization Behavior of Pb in Fly Ash Treatment by Roasting Method

机译：焙烧法处理粉煤灰中铅的氯化-挥发行为

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摘要

The larger part of the molten fly ash which is generated when municipal solid waste (MSW) is treated using gasifying and melting furnaces is handled as a specially-controlled waste in the same manner as incineration fly ash (fly ash from stoker-type incinerators), and is disposed of by landfill burial after stabilization treatment by methods designated by the national government, such as chelate treatment or cement fixation. Basically, however, these are not methods which separate out harmful substances. On the other hand, a shortage of landfill disposal sites has also become a major social problem. Therefore, the establishment of a technology which separates harmful substances such as lead, cadmium, etc. in fly ash as completely as possible, stabilizes the residual trace amounts of heavy metals, and enables recycling of the residue has been desired. In research on a process of this type, the authors constructed a pilot plant (45kg/h) for treatment of molten fly ash and conducted tests of detoxification and conversion to aggregate using several kinds of molten fly ash as raw materials, and carried out technical development of a new roasting treatment technology which enables advanced detoxification of molten fly ash and effective utilization of the residue. The results confirmed that this roasting process possesses sufficient potential for practical application as a treatment for molten fly ash. In the course of this research, (1) the mechanism of chlorination-volatilization of lead (Pb) was clarified, (2) a 99.5 percent Pb volatilization rate was achieved, and (3) 99.5 percent volatilization was possible with lead oxide-containing glass (lead glass from end-of-life televisions and computer monitors) by adequately crushing the lead glass and performing mixed roasting treatment with fly ash.
机译：使用气化和熔融炉处理市政固体废物（MSW）时产生的大部分熔融粉煤灰，与焚烧粉煤灰（来自煤渣式焚化炉的粉煤灰）一样，作为特殊控制的废物处理。并通过国家政府指定的方法（例如螯合剂处理或水泥固定）进行稳定化处理后，通过掩埋掩埋进行处置。但是，从根本上讲，这些不是分离有害物质的方法。另一方面，垃圾掩埋场的短缺也成为主要的社会问题。因此，期望建立一种技术，以尽可能完全地分离飞灰中的有害物质，例如铅，镉等，稳定残留的痕量重金属，并使残渣再循环。在对这种方法的研究中，作者建立了中试装置（45kg / h）来处理熔融粉煤灰，并以几种熔融粉煤灰为原料进行了脱毒和转化成骨料的试验，并进行了技术改造。开发了一种新的焙烧处理技术，可以对熔融的粉煤灰进行高级排毒并有效利用残渣。结果证实，该焙烧过程具有作为熔融粉煤灰处理的实际应用的足够潜力。在研究过程中，（1）阐明了铅（Pb）的氯化-挥发的机理，（2）达到了99.5％的Pb挥发率，（3）含铅的氧化物有99.5％的挥发率。充分粉碎铅玻璃并用粉煤灰进行混合焙烧处理，以使玻璃（报废电视和计算机显示器的铅玻璃）失效。

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