Electrochemically recycling degraded superalloy and valorizing CO_(2)in the aff ordable borate-modified molten electrolyte  

作　　者：Xiang Chen Yuan Sun Long Wang Xin Qu Yan Zhao Hong-Wei Xie Di-Hua Wang Hua-Yi Yin 

机构地区：[1]Key Laboratory for Ecological Metallurgy of Multimetallic Mineral of Ministry of Education,School of Metallurgy,Northeastern University,Shenyang 110819,China [2]Institute of Metal Research,Chinese Academy of Science,Shenyang 110016,China [3]School of Resource and Environmental Science,Wuhan University,Wuhan 430072,China

出　　处：《Tungsten》2024年第2期382-393,共12页钨科技（英文）

基　　金：support from Fundamental Research Funds for the Central Universities(N2025034);Xingliao Project(XLYC1807042);the 111 Project(B16009).

摘　　要：Integrating electrochemical reduction of CO_(2)and electrochemical oxidation to recycle degraded superalloys is a promising solution to ease resource scarcity and safeguard environmental sustainability.Herein,we propose an electrochemical technique for the conversion of bulk superalloy scraps and CO_(2)into oxide powder at the anode and solid carbon at the cathode,respectively.In particular,a borax-modifi ed CaCl_(2)-based molten salt electrolyte is used for enhancing the electrochemical oxidation of superalloy scraps.At a temperature of 700℃and a voltage of 2.8 V,90.55 wt.%of alloy scraps were oxidized in a molten CaCl_(2)–NaCl–CaCO_(3)–Na_(2)B_(4)O_(7)with an acid–base ratio(K_(a/b))of 1.The synergy of Cl−and B_(4)O_(7)2−of electrolyte prevents the passivation of the alloy anode and enables continuous oxidation.Furthermore,the Ni and Co in the anode products are recovered by sulfation roasting with recovery efficiencies of 85.58%and 95.27%for Ni and Co,respectively.Overall,modulating the alkalinity of the electrolyte for enhancing oxidation/pulverization of alloy scrap anode provides new insight into electrochemically recovering superalloy scraps.

关 键 词：Superalloy scraps RECYCLING Molten salt ALKALINITY Electrochemical oxidation Cobalt 

分 类 号：TQ150[化学工程—电化学工业] X701[环境科学与工程—环境工程]