Highly efficient recovery of ruthenium from integrated circuit (IC) manufacturing wastewater by Al reduction and cementation

被引：14

作者：

Le, Van-Giang ^{[1
]}

Chi-Thanh Vu ^{[2
]}

Shih, Yu-Jen ^{[3
]}

Huang, Yao-Hui ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Dept Chem Engn, Tainan 71710, Taiwan

[2] Univ Alabama, Civil & Environm Engn Dept, Huntsville, AL 35899 USA

[3] Natl Sun Yat Sen Univ, Inst Environm Engn, Kaohsiung 804, Taiwan

来源：

RSC ADVANCES | 2019年 / 9卷 / 44期

关键词：

SEPARATION; KINETICS; METALS;

D O I：

10.1039/c9ra03331a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Ruthenium (Ru) is a rare-earth metal, which is employed widely in metal-processing industries. This study recovered Ru from the wastewater of an IC foundry by cementation using metallic aluminum (Al) powder as the sacrificial agent. Ru ions were efficiently reduced to the metal and coagulated with the derived aluminum hydroxide flocs. Experimental parameters included the particle size of Al, molar ratio of Al to Ru, initial Ru concentration and operation temperature. The recovery rate reached 99% under these conditions: particle size Al powder = 88-128 mu m, Al/Ru molar ratio = 2.0, initial Ru = 200 mg L-1, temperature = 338.16 K, reaction time = 120 min, stirring speed = 150 rpm. The cemented Ru over Al powder was spherical with a rough surface. Kinetic modelling suggested that the diffusion of Ru through the ash layer of Al powder controlled the reaction rate with an activation energy of 40.75 kJ mol(-1). A brief cost analysis demonstrated that the cementation of Ru yielded a profit of $0.180 per 0.1 m(3)-wastewater.

引用

页码：25303 / 25308

页数：6