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中國(guó)有色金屬學(xué)報(bào)

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷第10期總第259期 2020年10月

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文章編號(hào)：1004-0609(2020)-10-2427-08

LiF-LaF₃-La₂O₃熔鹽體系的電導(dǎo)率

陳淑梅^{1, 2}，洪侃²，伍昕宇¹，梁鑫²，廖春發(fā)¹，陳東英²

(1. 江西理工大學(xué) 材料冶金化學(xué)學(xué)部，贛州 341000；
2. 贛州有色冶金研究所，贛州 341000)

摘要: 在制備La-Cu中間合金方法的基礎(chǔ)上，采用連續(xù)改變電導(dǎo)池常數(shù)法(Continuously varying cell constant, CVCC)研究了LiF-LaF₃-La₂O₃熔鹽體系的電導(dǎo)率，運(yùn)用Arrehnius方程計(jì)算了熔鹽體系的電導(dǎo)活化能，并采用最小二乘法對(duì)數(shù)據(jù)進(jìn)行擬合，建立了溫度、LaF₃含量(質(zhì)量分?jǐn)?shù))、La₂O₃含量與熔鹽電導(dǎo)率之間關(guān)系的回歸方程。結(jié)果表明：熔鹽體系的電導(dǎo)率隨溫度的升高而增大，隨La₂O₃含量的增加而增大，隨熔鹽中LaF₃含量的增加而減小。熔鹽電導(dǎo)率與溫度(t)、La₂O₃含量(w(La₂O₃))、LaF₃含量(w(LaF₃))的關(guān)系可以表示為 k=-1.54114+0.00794t- 0.03704w(LaF₃)+0.10839w(La₂O₃)，從而可以確定電解LiF-LaF₃-La₂O₃熔鹽制備La-Cu合金較為理想的條件如下： 80.0%≤w(LaF₃)＜85.0%，1.0%≤w(La₂O₃)≤2.0%，電解溫度應(yīng)控制在960~980 ℃。

關(guān)鍵字: 電導(dǎo)率；熔鹽體系；La-Cu合金；La₂O₃

Electrical conductivity of molten LiF-LaF₃-La₂O₃system for La-Cu alloy

CHEN Shu-mei^{1, 2}, HONG Kan², WU Xin-yu¹, LIANG Xin², LIAO Chun-fa¹, CHEN Dong-ying²

（1. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China
2. Ganzhou Nonferrous Metallurgy Research Institute, Ganzhou 341000, China）

Abstract:The electrical conductivity of LiF-LaF₃-La₂O₃ molten salts (w(LaF₃)=75.0%-90.0%, w(La₂O₃)=1.0%-3.0%) was systematically measured in the temperature range from 950 ℃ to 1030 ℃ by using continuously varying cell constant(CVCC) method. The composition and temperature dependences of the LiF-LaF₃-La₂O₃ system electrical conductivity were investigated. The optimal operation conditions for La-Cu alloy production were determined via an analysis of electrical conductivity and activation energy for conductance which calculated based on the Arrhenius equation. The results show that the molten system electrical conductivity linearly increases with the increase of temperature and the La₂O₃content, and decreases with the increase of LaF₃ content. The regression functions of the conductance with temperature(t) and LaF₃content(w(LaF₃))and La₂O₃content(w(La₂O₃)), can be express as: k=-1.54114+0.00794t-0.03704w(LaF₃)+0.10839w(La₂O₃). The optimal electrolysis conditions for preparing La-Cu alloy in LiF-LaF₃-La₂O₃ molten salt are as follows: 80.0%≤w(LaF₃)＜85.0%, 1.0%≤w(La₂O₃)≤2.0% , the temperature range from 960 ℃ to 980 ℃.

Key words: electrical conductivity; molten salt; La-Cu alloy; lanthanum oxide

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

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