High temperature chlorination of PbO by NaCl and Si/Al matrix

doi:10.11949/j.issn.0438-1157.20180206

Abstract

Abstract:

During waste incineration, PbO (difficult to volatilize) can be chlorinated to PbCl₂ (easy to volatilize) by the interaction of NaCl and Si/Al in ash at high temperature. The mechanisms of this transformation were investigated by analyzing the release of chlorine and lead in the view of indirect and direct chlorination during the tube furnace incineration at rising temperature. During the indirect chlorination initialized at 700-800℃, oxygen containing water vapor was found more favorable to reaction than oxygen without water vapor, while Al₂O₃ was more favorable than SiO₂. NaCl was found as vapor to participate indirect chlorination. During the direct chlorination through SiO₂, PbO reacted with SiO₂ first to form silicate at about 500℃, and then reacted with NaCl vapor produced initially at about 650℃. During the direct chlorination through Al₂O₃, PbO reacted with Al₂O₃ first to form aluminate at 700-800℃, and then reacted with NaCl. When Al₂O₃ was mixed with SiO₂, the direct chlorination properties turned from SiO₂ matrix type to Al₂O₃ matrix type, and the initial chlorination temperature increased from about 650℃ to 700-800℃.

Key words: waste incineration, sodium chloride, lead, chlorination, silicon and aluminium

摘要：

垃圾焚烧过程中，在灰中Si/Al基质的作用，NaCl可以将不易挥发的PbO转化为易挥发的PbCl₂，从而显著增加烟气中的Pb排放。使用管式炉加热NaCl/Si/Al基质/PbO反应物体系，通过分析升温过程Cl和Pb的释放过程，从间接氯化和直接氯化角度，探索了高温氯化规律与机制。试验发现，间接氯化时氧气中有水蒸气比无水蒸气更有利于反应，Al₂O₃比SiO₂更有利于反应，初始氯化温度通常为700~800℃，NaCl以气态形式参与反应；通过SiO₂直接氯化时，约500℃时PbO与SiO₂反应生成硅酸盐，然后与NaCl蒸气反应，初始氯化温度约650℃；通过Al₂O₃直接氯化时，700~800℃时PbO与Al₂O₃反应生成铝酸盐，然后与NaCl蒸气反应；向SiO₂中添加Al₂O₃会阻碍PbO与SiO₂的反应，氯释放特征由SiO₂基质型向Al₂O₃基质型转变，初始氯化温度升高至700~800℃。

关键词: 垃圾焚烧, 氯化钠, 铅, 氯化, 硅铝

CLC Number:

TK16

WANG Xinye, DU Rong, ZHANG Chengwen, ZHAO Zhiyuan, ZHANG Jubing, BU Changsheng, HUANG Yaji, ZHANG Wen. High temperature chlorination of PbO by NaCl and Si/Al matrix[J]. CIESC Journal, 2018, 69(9): 3993-4000.

王昕晔, 杜荣, 张程文, 赵志远, 张居兵, 卜昌盛, 黄亚继, 张文. Si/Al基质作用下NaCl高温氯化PbO的机制[J]. 化工学报, 2018, 69(9): 3993-4000.

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