利用田口法最佳化固態氧化物燃料電池電極稀土元素回收再利用

Optimization of recycle and reuse of rare earth element from solid oxide fuel cell electrode by Taguchi method

蔡杰廷(Jie-Ting Tsai)

指導教授 ： 余炳盛

國立臺北科技大學/工程學院/資源工程研究所/碩士(2014年)

https://doi.org/10.6841/NTUT.2014.00868

摘要

固態氧化物燃料電池(SOFC)為重要新穎能源技術之一，SOFC中的陰極、陽極和電解質材料常含有豐富鈰、釓、鑭等稀土元素，具有高回收價值。本文以燒結鑭鍶鈷鐵氧化物(LSCF)陰極材料及氧化鎳-釓摻雜氧化鈰(NiO-GDC)陽極材料為起始原料，以萃取礦石稀土元素的技術，搭配田口方法規劃及選用L9(34)直交表進行不同元素分離回收，並透過田口分析及變異分析求取最佳參數。結果發現酸溶法可將鑭、鍶、鈷、鐵、鎳等元素溶出，而與鈰及釓達到分離效果。田口分析得到之酸溶最佳參數為：酸液種類：硝酸、酸液濃度：3M、反應溫度：60℃、反應時間：2hr，燒結粉末中鑭、鍶、鈷、鐵元素溶出率可達100%。鑭、鍶、鈷、鐵溶出酸液可透過GNP燃燒法再生合成LSCF粉末，經由XRD分析發現，再生合成的LSCF粉末以及酸溶殘留的GDC粉末，與各別的初始粉末均具相同結構，可再應用於SOFC之電極材料，達到回收再利用的目的。

關鍵字

田口方法 ； 固態氧化物燃料電池 ； 稀土回收 ； GNP燃燒法

並列摘要

Solid oxide fuel cell (SOFC) is one of the important novel energy technology. The SOFC of the cathode, anode and electrolyte are often rich in rare earth elements with high recovery value, such as cerium, gadolinium and lanthanum.
In this study, sintered La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode material and NiO-Ce0.9Gd0.1O1.95 (NiO-GDC) anode material as a original material. Studies of rare earth recovery by solvent extraction, the study was planned by the Taguchi method and selected the L9 (34) orthogonal table to separate and recover the different elements and analysis of optimal parameters by Taguchi and Variation analysis. As a result, acid digestion method was found to be La, Sr, Co, Fe and Ni dissolution, and Ce, Gd achieve the separation effect. Taguchi analysis of acid-soluble obtain optimal parameters are acid category: nitric, acid concentration : 3M, reaction temperature : 60 ℃, reaction time : 2hr, sintered powder of La, Sr, Co, Fe leaching rate is up to 100 %. Acid containing La, Sr , Co, Fe element can synthesis LSCF powder by GNP combustion then synthesis LSCF powder and recovery GDC powder crystal the same Original powder by XRD. Synthesis LSCF powder and recover GDC powder can apply to SOFC electrode material to achieve the purpose of recycling.

並列關鍵字

Taguchi ； Solid oxide fuel cell ； Rare earth ； GNP

參考文獻

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