Volatilization Behavior of Fluorine in Fluoroborate Residue during Pyrolysis

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• 作者：Yuheng Feng ; Xuguang Jiang ; Yong Chi ; Xiaodong Li ; Hongmei Zhu
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：January 3, 2012
• 年：2012
• 卷：46
• 期：1
• 页码：307-311
• 全文大小：277K
• 年卷期：v.46,no.1(January 3, 2012)
• ISSN：1520-5851

文摘

Industrial hazardous waste from the fluorine chemical industry sometimes has a high content of fluorine, and incinerating it could be very poisonous if the flue gas is not properly disposed. In this study fluoroborate residue is used to represent a typical waste from the fluorine chemical industry . Thermogravimetric analysis coupled with Fourier transform infrared analysis (TG-FTIR analysis) was used to study the evolution characteristics of gaseous products during the pyrolysis of fluoroborate residue. The pyrolysis process of fluoroborate residue could be divided into three stages according to the TG analysis: moisture loss, fast decomposition, and charring. SiF₄, BF₃, and HF are found as fluorine gas species evolved in the pyrolysis process. The evolution of SiF₄ finishes at 600 掳C. The evolution of BF₃ has two peaks and most of the emission happens before 600 掳C. The release of HF could be divided into two stages due to the different existence of F^{鈥?/sup>. In addition, the reforming condition of different fluorine-containing gaseous substances is verified in a thermodynamic equilibrium model and the results could explain the experiment phenomenon well.}