Kinetics of recovering germanium from lignite ash with chlorinating roasting methods
来源期刊：Rare Metals2008年第3期
论文作者：ZHU Guocai WANG Jingyan CHENG Zhuo ZHAO Yuna Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing ,China
文章页码：238 - 242
摘 要：<正>A process of recovering Ge by chlorinating masting was put forward.GeCl4 was separated and recovered from lignite ash because of its low boiling point.Kinetic analysis indicates that the chlorinating masting process fits with the unreacted-core shrinking model and the reaction rate equation corresponds to 1-2a/3-（1-a）2/3=kt.The apparent activation energy Ea is calculated to be 22.36 kJ·mol-1.The diffusion of product layer serves as the rate-controlling step in this process.When the masting temperature is 250℃,the masting time is 60 min,the con- centration of hydrochloric acid is 10 mol/L,and the ratio of liquid to solid is 10(mHCl/ash=10),and 90% Ge in lignite ash can be recovered.
摘要：<正>A process of recovering Ge by chlorinating masting was put forward.GeCl4 was separated and recovered from lignite ash because of its low boiling point.Kinetic analysis indicates that the chlorinating masting process fits with the unreacted-core shrinking model and the reaction rate equation corresponds to 1-2a/3-（1-a）2/3=kt.The apparent activation energy Ea is calculated to be 22.36 kJ·mol-1.The diffusion of product layer serves as the rate-controlling step in this process.When the masting temperature is 250℃,the masting time is 60 min,the con- centration of hydrochloric acid is 10 mol/L,and the ratio of liquid to solid is 10(mHCl/ash=10),and 90% Ge in lignite ash can be recovered.
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