Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第8期    总第113期    2008年8月

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文章编号:1004-0609(2008)08-1555-05
熔盐电解法制备铝锂中间合金
李继东,张明杰,张廷安,李 丹,张 卓

(东北大学 材料与冶金学院,沈阳 110004)

摘 要:  

研究在LiCl-LiF-Li2CO3纯锂盐体系中下沉式铝液阴极槽结构电解生成铝锂中间合金的工艺过程,尤其是以Li2CO3­­为原料代替LiCl的电解过程。采用熔盐电解监控仪测量电解过程中的反电动势、槽电压、电流等工艺参数及电解波形图,通过电位控制法调节Li2CO3的加料周期,同时根据得到的合金产品中的锂含量探讨影响电流效率的因素。结果表明,反电动势随电流密度增加而增大,加入2%Li2CO3­­­可使反电动势降低0.5 V;通过控制电位法测得加料周期为15 min;在680 ℃、电流密度为0.62 A/cm2的条件下持续电解3 h,最终制得了锂含量高达7.93%的铝锂合金,电流效率可达74.1%

 

关键词: 铝锂合金;熔盐电解;反电动势;电流效率

Preparation of Al-Li master alloys by molten salt electrolysis
LI Ji-dong, ZHANG Ming-jie, ZHANG Ting-an, LI Dan, ZHANG Zhuo

School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China

Abstract:Al-Li master alloys were prepared using sinking-mode aluminum liquid as cathode and a mixture of LiCl-LiF-Li2CO3 as molten salt electrolyte in a laboratory cell. The electrolysis process with Li2CO3 as raw material instead of LiCl was studied in detail. The technological parameters such as back electromotive force, cell voltage, current and electrolysis waveform were measured by testing device of molten salt electrolysis. The period of Li2CO3 feeding was adjusted by the method of electric potential control. At the same time, the factor that affects current efficiency was discussed according to the lithium content of alloys obtained. The results indicate that back electromotive force increases with increasing current density and decreases by 0.5 V after adding 2% Li2CO3, the feeding period is 15 min measured by the method of electric potential control. Finally, the Al-Li alloy with the lithium content of 7.93%(mass fraction) can be obtained by electrolyzing for 3 h at the current density of 0.62 A/cm2 and at 680 ℃, and the current efficiency can reach 74.1%.

 

Key words: Al-Li alloy; molten salt electrolysis; back electromotive force; current density

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

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

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