Molten-salt enhanced anodic oxidation for upcycling alloy scraps

被引：8

作者：

Zhao, Yan ^{[1
]}

Chen, Xiang ^{[1
]}

Qu, Jiakang ^{[1
]}

Xie, Hongwei ^{[1
]}

Du, Kaifa ^{[2
]}

Xing, Pengfei ^{[1
]}

Wang, Dihua ^{[2
]}

Sun, Yuan ^{[3
]}

Yin, Huayi ^{[1
,2
,4
]}

机构：

[1] Northeastern Univ, Sch Met, Key Lab Ecol Met Multimetall Mineral, Minist Educ, Shenyang 110819, Peoples R China

[2] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China

[3] Chinese Acad Sci, Inst Met Res, Shenyang 110819, Peoples R China

[4] Northeastern Univ, Key Lab Data Analyt & Optimizat Smart Ind, Minist Educ, Shenyang 110819, Peoples R China

来源：

CORROSION SCIENCE | 2022年 / 206卷

关键词：

Hard alloy scraps; Electrochemical corrosion; Oxygen reduction; Molten salt; Recycling; RECOVERY; RHENIUM; METALS; SUPERALLOYS; SEPARATION; ELEMENTS;

D O I：

10.1016/j.corsci.2022.110516

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Reclaiming valuable metals from spent alloys involves energy-intensive pulverization and the sluggish dissolution rate. Herein, we propose an enhanced corrosion strategy to convert alloy scraps to oxide powders. The oxidation rate reaches similar to 1.67 mm h(-1) in molten CaCl2-NaCl-CaO at 700 degrees C because Cl- excludes passivation and enables continuous oxidation. In addition, the soluble CaO in molten CaCl2-NaCl prevents the generation of transition metal chlorides, which relieves using the expensive ion-selective membrane to eliminate the parasitic reaction. Overall, the molten salt enhanced anodic corrosion provides a green and general way to achieve the pulverization and oxidation of various alloy scraps.

引用

页数：11

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