Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第12期    总第213期    2016年12月

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文章编号:1004-0609(2016)-12-2686-08
湿法回收废铅膏中间产物柠檬酸铅Pb3(C6H5O7)2·3H2O的热分解
朱新锋1,王现丽1,聂鹏茹2,张 伟2,胡雨辰2,杨家宽2,汪 潇1,郭一飞1

(1. 河南城建学院 市政与环境工程学院,平顶山 467036;
2. 华中科技大学 环境科学与工程学院,武汉 430074
)

摘 要: 借助热天平与红外光谱仪联用仪、X射线衍射仪、扫描电镜分析手段研究柠檬酸铅Pb3(C6H5O7)2·3H2O的热分解过程和产物。结果表明:柠檬酸铅Pb3(C6H5O7)2·3H2O的热分解过程分水分脱除、无水物分解和燃烧3个阶段;结晶水在无水物分解阶段散失,温度达到100~200 ℃时产生部分有机物,超过此温度时产物主要是CO2,最终产物为氧化铅与金属铅;柠檬酸铅在空气中分解受焙烧温度影响较为显著,柠檬酸铅前驱物Pb3(C6H5O7)2·3H2O低温焙烧时产物的主要成分是α-PbO、β-PbO与金属铅,高温焙烧时产物主要成分是β-PbO。

 

关键词: 柠檬酸铅;热分解;机理;铅膏中间产物

Thermal decomposition of lead citrate Pb3(C6H5O7)2·3H2O from recovery spent lead paste by hydrometallurgy process
ZHU Xin-feng1, WANG Xian-li1, NIE Peng-ru2,ZHANG Wei2, HU Yu-chen2, YANG Jia-kuan2, WANG Xiao1, GUO Yi-fei1

1. College of Municipal and Environmental Engineering, Henan University of Urban Construction, Pingdingshan 467036, China;
2. College of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Abstract:Thermal decomposition behavior and product were systematically investigated by TG-FTIR, XRD, SEM analysis. The results show that the thermal decomposition process of lead citrate is divided into dewatering, organic constituent decomposition and burning stages. The dehydrating crystal water occurs in the initial decomposition followed by the generation of intermediate organic matters at 100-200 ℃. Subsequently, the ultimate gas and solid products from this decomposition process are CO2 and a mixture mainly containing PbO and Pb, respectively. The major products of Pb3(C6H5O7)2?3H2O at relatively low temperature are α-PbO, β-PbO and Pb, whereas, β-PbO is the dominant product at relatively higher temperature.

 

Key words: lead citrate; thermal decomposition; mechanism; lead paste

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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