水洗對(duì)焚燒飛灰熔融固化過(guò)程重金屬揮發(fā)的影響

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中圖分類(lèi)號(hào)：TQ171 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：1671-8755（2025）02-0040-06

Abstract：The high-temperature melting and solidification technology can effectively decompose the organic pollutants in the flyash and solidify the heavy metal elements.However，the flyash often contains Cl elements with a mass fraction exceeding 10% ，which makes the heavy metals extremely volatile during the high-temperature process.In this study，the Cl elements in the fly ash were removed through water washing，and the high-temperature phase transformation of the fly ash glass batch materials before and after water washing as well as the rules of heavy metal volatilization at high temperatures were investigated. The results show that the water washing process can remove 95% of the Cl elements in the fly ash．After theflyash glass batch materials are subjected to high-temperature heat treatment，the chlorides，sulfates and intermediate phases in them gradually disappear before water washing，and a typical amorphous glass is formed after the temperature reaches 1 200°C . The washed fly ash glass batch shows complete absence of chlorides after water washing，the carbonates in the sample decompose as the temperature rises，and all other phase transformations remain consistent with the pre-washed samples.The washed flyash glassbatch demonstratesvolatilization ratesbelow 10% for Gu ， Zn ，and Pb elements when melted at 1 300‰ .In contrast，the unwashed batch contains approximately 7% mass fraction of Cl element，which readily forms heavy metal chlorides during high-temperature melting.Thischloride formation accelerates the volatilization of heavy metals，resulting in volatilization rates exceeding 30% for Gu ， （204號(hào) Zn ，and Pb at 1 300cC ：

Keywords： Incineration fly ash；High-temperature melting and solidfication；Heavy metal；Volatilization； Water washing

垃圾焚燒發(fā)電，具有占地面積小、減容減量高、資源利用率高等優(yōu)勢(shì)，已在我國(guó)大力推廣應(yīng)用。（剩余8104字）