采用循环伏安法研究了ＬａＦ＿３－ＬｉＦ二元熔体及添加Ｌａ＿２（ＣＯ＿３）＿３的ＬａＦ＿３～ＬｉＦ熔体中，９２０～９５０℃下，Ｌａ￣（３＋）在石墨电极上还原的阴极过程。结果表明：在ＬａＦ＿３－ＬｉＦ熔体中，电位在－０．８５Ｖ左右（相对于石墨参比电极），Ｌａ￣（３－）离子在阴极还原析出；在添加Ｌａ＿２（ＣＯ＿３）＿３，的ＬａＦ＿３－ＬｉＦ三元熔体中，Ｌａ（ＣＯ＿３）＿３，分解为Ｌａ＿２Ｏ＿３，Ｌａ＿２Ｏ＿３首先电解，然后ＬａＦ＿３电解，均在阴极上析出镧。镧离子的电化学反应是简单的一步反应，即Ｌａ￣（３＋）＋３ｅ→Ｌａ。 The cyclic voltammetry was used to study the cathodic process of La ~ (3+) reduction on LaFe_3-LiF melt and LaF_3 ~ LiF melt with addition of La_2 (CO_3) _3 at 920 ~ 950 ℃. The results show that La ~ (3-) ions are reduced and precipitated in the LaF_3-LiF melt at -0.85V (relative to the graphite reference electrode), while LaF_3- LiF ternary melt, La (CO_3) _3, decomposition of La_2O_3, La_2O_3 first electrolysis, and then LaF_3 electrolysis, are precipitated in the cathode of lanthanum. The electrochemical reaction of lanthanum ions is a simple one-step reaction, namely La ~ (3 +) + 3e → La.