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18卷    第z1期    总第100期    2008年6月

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文章编号:1004-0609(2008)S1-0160-06
D301树脂对铁氰溶液中Fe(Ⅲ)及
CN的吸附行为及机理
宋永辉,兰新哲,李秀玲

(西安建筑科技大学 贵金属工程研究所,西安 710055)

摘 要: 研究铁氰溶液中D301树脂对Fe(Ⅲ)及CN的吸附性能及过程的动力学和热力学参数。结果表明:25 ℃时,D301树脂(湿树脂)对Fe(Ⅲ)及CN的饱和吸附量分别为2.173 49 mg/mL和28.963 2 mg/mL。吸附过程符合Lagergren二级速度方程,以液膜扩散为主控步骤。树脂对Fe(Ⅲ)及CN的吸附速率方程分别为:t/Qt=0.057 1 t+2.415和t/Qt=0.427 9 t+4.572 1,吸附速率常数分别为k2=1.35 mL/(g∙min)和k2=39.9 mL/(g∙min)。热力学研究表明,吸附过程的焓变分别为: =16.78 J/mol, =11.07 J/mol,表明吸附过程是吸热过程。

 

关键字: 树脂;吸附;动力学;热力学

Adsorption behavior and mechanism of D301 resin for
Fe(Ⅲ) and CN in iron-cyanide solution
SONG Yong-hui, LAN Xin-zhe, LI Xiu-ling

Institute of Precious Metal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

Abstract:The sorption properties of D301 resin for Fe(Ⅲ) and CN were studied as well as dynamic parameter and thermodynamic parameter in the process. The static saturated adsorptive capacity of D301 resin on Fe(Ⅲ) and CN is 2.173 49 mg/mL and 28.963 2 mg/mL, respectively, at 25 ℃. The sorption process accords with Lagergren-equation and the liquid film diffusion is the predominating step of the sorption process. The adsorption rate equations for CN and Fe(Ⅲ) are t/Qt=0.057 1 t+2.415 and t/Qt=0.427 9 t+4.572 1, respectively. The adsorption rate constants for CN and Fe(Ⅲ) are k2=1.35 mL/(g∙min) and k2=39.9 mL/(g∙min). The thermodynamic result indicates =16.78 J/mol and =11.07 J/mol. The sorption process is an endothermic process.

 

Key words:  resin; adsorption; dynamics; thermodynamics

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

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

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