Mechanism of formation and evaporation reaction of metal oychlorides

金属酰氯化物的形成和蒸发反应机理

基本信息

批准号：
18360364
负责人：
TSUKIHASHI Fumitaka
金额：
$ 10.69万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360364/
关键词：
recycling chloride oxychloride zinc thermodynamics reaction kinetics chlorination reaction steelmaking dust

项目摘要

The purpose of present research is to clarify the formation reaction mechanism of the oxychloride compounds which are formed during the processing of waste materials and the recycling process. The fundamental data of thermodynamic properties of the free energies of formation of zinc and lead oxychlorides and of the kinetics of formation and evaporation of oxychlorides were observed.The metals observed in the present research are zinc and lead. To clarify the formation and evaporation mechanism of metal oxychloride, the chlorination and evaporation of behaviors of metal oxides were investigated by using transpiration method at high partial pressure of oxygen. The weight change of metal oxides in an alumna crucible during chlorination reaction was observed with changing partial pressures of oxygen and chlorine and the partial pressures of oxychlorides were obtained. Based on the observed results, the Gibbs free energies of the formation of zinc and lead oxychlorides were calculated.Furthermore, the weight change of zinc and lead oxides in an alumina crucible by chlorination reaction with time was obtained. The kinetics of chlorination and the evaporation reaction of oxides were analyzed and the reaction mechanism was clarified. The chlorination rate slightly increased with increasing oxygen partial pressure. These phenomena were explained by the formation of zinc oxychloride during evaporation reaction. The stable species of zinc and lead oxychlorides were clarified.It can be concluded that the effective recycling process of resources from the waste materials such as steelmaking dust etc. which contains valuable metals of zinc and lead etc. is possible by using chlorination reaction.

本研究的目的是阐明废物处理和回收过程中形成的氯氧化物的形成反应机理。观测了氯氧化物锌和氯氧化物形成自由能的热力学性质以及氯氧化物形成和蒸发动力学的基本数据。本研究观测到的金属是锌和铅。为了阐明金属氯氧化物的形成和蒸发机理，采用蒸腾法研究了高氧分压下金属氧化物的氯化和蒸发行为。观察氯化反应过程中氧化铝坩埚中金属氧化物的重量随氧分压和氯分压的变化而变化，得到氯氧化物分压。根据观测结果，计算了形成锌和铅的氯氧化物的吉布斯自由能。此外，还得到了氧化铝坩埚中氯化反应产生的锌和铅的氧化物随时间的重量变化。分析了氯化反应和氧化物蒸发反应的动力学，阐明了反应机理。随着氧分压的增加，氯化速率略有增加。这些现象可以通过蒸发反应过程中形成氯氧化锌来解释。明确了氯氧化锌、氯氧化铅的稳定形态。由此可见，利用氯化反应，可以对含有锌、铅等有价金属的炼钢烟尘等废料进行有效的资源化回收利用。