JP3428479B2 - Electrolytic bath for aluminum refining - Google Patents
Electrolytic bath for aluminum refiningInfo
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- JP3428479B2 JP3428479B2 JP37184498A JP37184498A JP3428479B2 JP 3428479 B2 JP3428479 B2 JP 3428479B2 JP 37184498 A JP37184498 A JP 37184498A JP 37184498 A JP37184498 A JP 37184498A JP 3428479 B2 JP3428479 B2 JP 3428479B2
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、アルミニウムを三
層電解法により精製するとき用いる三層電解用電解浴に
関するものである。TECHNICAL FIELD The present invention relates to an electrolytic bath for three-layer electrolysis used when purifying aluminum by a three-layer electrolysis method.
【０００２】[0002]
【従来技術】アルミニウムから電解精製により高純度ア
ルミニウムを得る方法としては、陽極として最下層に比
重の大きいＡｌ−Ｃｕ合金を用い、中間層として溶融電
解浴を用い、最上層には陰極として比重の軽い精製され
た高純度アルミニウムを用いて電解を行う、いわゆる三
層電解法がよく知られている。2. Description of the Related Art As a method for obtaining high-purity aluminum from aluminum by electrolytic refining, an Al--Cu alloy having a large specific gravity is used as an anode, a molten electrolytic bath is used as an intermediate layer, and a specific gravity is used as a cathode for the uppermost layer. The so-called three-layer electrolysis method, in which electrolysis is performed using lightly purified high-purity aluminum, is well known.
【０００３】この電解法に用いられる電解浴の条件とし
ては、１）最下層の陽極合金より軽く、最上層の陰極ア
ルミニウムより重いこと。２）融点がアルミニウムの融
点より少し高いこと。３）アルミニウムより活性な金属
の塩類であること。４）電気伝導度が高いこと等が知ら
れている。〔丸善（株）電気化学便覧１０２３（１９６
４）〕したがって、一般に電解浴成分としては、塩化ア
ルミニウムまたは弗化アルミニウムとアルカリ金属、ア
ルカリ土類金属等のハロゲン化物が用いられてきた。The conditions of the electrolytic bath used in this electrolysis method are: 1) Lighter than the lowermost anode alloy and heavier than the uppermost cathode aluminum. 2) The melting point is slightly higher than that of aluminum. 3) A salt of a metal more active than aluminum. 4) It is known that the electric conductivity is high. [Maruzen Electrochemical Handbook 1023 (196
4)] Therefore, aluminum chloride or aluminum fluoride and a halide such as an alkali metal or an alkaline earth metal have been generally used as the electrolytic bath component.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、電解に
用いられる塩化アルミニウム、アルカリ金属、アルカリ
土類金属等の塩化物は蒸気圧が高いため、時間の経過と
ともにそれ等が減少して電解浴組成に変動が生じてく
る。また、電解浴組成が適切でない場合、そこに含まれ
るアルカリ金属やアルカリ土類金属が精製アルミニウム
中へ移行したり、電気伝導度が小さいために消費電力が
大きくなる等、アルミニウム精製を工業的に行う電解浴
として決して満足のできるものではなかった。However, since chlorides such as aluminum chloride, alkali metal, and alkaline earth metal used for electrolysis have a high vapor pressure, they decrease with the passage of time, resulting in an electrolytic bath composition. Fluctuations will occur. In addition, when the composition of the electrolytic bath is not appropriate, the alkali metal or alkaline earth metal contained therein migrates into the refined aluminum, or the electric power consumption is increased due to the low electric conductivity. It was by no means satisfactory as an electrolytic bath to carry out.
【０００５】[0005]
【課題を解決するための手段】かかる事情に鑑み、本発
明者らは、アルミニウムの三層電解法において電解浴成
分中のアルカリ金属、アルカリ土類金属による精製アル
ミニウムの汚染を防ぎ、かつ、省エネルギー化の観点か
ら高い電気伝導度を示し、電解浴組成に変動がなく、安
定した電解の行える電解浴を開発することを目的として
鋭意検討を重ねた結果、特定の電解浴成分を特定量範囲
で用いる場合には、上記目的を全て満足し得る三層電解
用電解浴となることを見出し、本発明を完成させるに至
ったものである。In view of such circumstances, the inventors of the present invention can prevent the purified aluminum from being contaminated by alkali metal or alkaline earth metal in the electrolytic bath component in the three-layer electrolytic method of aluminum, and can save energy. As a result of intensive studies aimed at developing an electrolytic bath that exhibits high electrical conductivity from the viewpoint of chemical composition, has no fluctuation in the composition of the electrolytic bath, and can perform stable electrolysis, a specific electrolytic bath component within a specific amount range When used, they have found that the electrolytic bath for three-layer electrolysis can satisfy all the above objects, and have completed the present invention.
【０００６】すなわち、本発明は、三層電解法によるア
ルミニウム精製において、電解浴成分がＮａＦ：１７〜
２１重量％、ＢａＦ2：２７〜３１重量％、ＬｉＦ：１
〜３重量％、ＣａＦ2：８重量％以下、残りがＡｌＦ3か
らなることを特徴とするアルミニウム精製用電解浴を提
供するものである。また、本発明は、三層電解法による
アルミニウム精製において、電解浴成分がＮａＦ：１７
〜２１重量％、ＢａＦ 2 ：２７〜３１重量％、ＬｉＦ：
１〜３重量％、ＣａＦ 2 ：８重量％以下、残りがＡｌＦ 3
からなり、７７０℃において電気伝導度が０．９０Ω-1
ｃｍ-1以上であることを特徴とするアルミニウム精製用
電解浴をも提供するものである。That is, in the present invention , in the aluminum purification by the three-layer electrolysis method, the electrolytic bath component is NaF: 17-
21% by weight, BaF 2 : 27 to 31% by weight, LiF: 1
3 wt%, CaF 2: 8 wt% or less, Hisage aluminum purification electrolytic bath rest, characterized in AlF 3 Tona Rukoto
It is something to offer. Further, the present invention is based on the three-layer electrolysis method.
In aluminum refining, the electrolytic bath component is NaF: 17
To 21 weight%, BaF 2: 27~31 weight%, LiF:
1 to 3% by weight, CaF 2 : 8% by weight or less, the balance is AlF 3
Tona is, the electric conductivity at 770 ℃ 0.90Ω -1
The present invention also provides an electrolytic bath for purifying aluminum, which is characterized by having a cm -1 or more.
【０００７】[0007]
【発明の実施の形態】以下、本発明を詳細に説明する。
アルミニウムの電解においては、電解浴成分としてＡｌ
Ｆ3 またはＡｌＣｌ3を必要とするが、ＡｌＣｌ3 は蒸
気圧が１８０℃で７６０ｍｍＨｇと高いので、通常はＡ
ｌＦ3 を用いた方が電解浴を安定にすることができる。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
In the electrolysis of aluminum, Al is used as an electrolytic bath component.
F 3 or AlCl 3 is required, but since AlCl 3 has a high vapor pressure of 760 mmHg at 180 ° C., it is usually A
The use of IF 3 can stabilize the electrolytic bath.
【０００８】また、支持塩としてアルカリ金属、アルカ
リ土類金属のハロゲン化物を添加する必要があるが、支
持塩においても塩化物を用いた場合、塩素イオンとアル
ミニウムイオンが反応して、ＡｌＣｌ3 を形成する反応
がおこる。そのため、電解浴成分はすべて弗化物である
ことが好ましい。Further, it is necessary to add a halide of an alkali metal or an alkaline earth metal as a supporting salt, but when a chloride is also used in the supporting salt, chlorine ions and aluminum ions react with each other to form AlCl 3 . The reaction that forms occurs. Therefore, it is preferable that all electrolytic bath components are fluorides.
【０００９】本発明者らは、弗化物からなる電解浴の成
分ならびにその組成物を詳細に検討した結果、ＮａＦ、
ＢａＦ2 、ＬｉＦ、ＣａＦ2 、ＡｌＦ3 の５成分系にお
いて、電解中においても電解浴中のＮａ、Ｂａ、Ｌｉ、
Ｃａが精製アルミニウム中へ移行する量が極めてわずか
で、高い電気伝導度を有するアルミニウム精製用電解浴
を開発した。The present inventors have studied in detail the components of the electrolytic bath made of fluoride and the composition thereof, and as a result, NaF,
In the five-component system of BaF 2 , LiF, CaF 2 , and AlF 3 , Na, Ba, Li, and
An electrolytic bath for refining aluminum has been developed, which has a very small amount of Ca transferred to purified aluminum and has high electric conductivity.
【００１０】三層電解法において、三層を保つために電
解浴の比重は、陽極合金と精製アルミニウムとの間にな
ければならない。ここで、電解浴の比重は、ＮａＦ、Ｂ
ａＦ2、ＬｉＦ、ＣａＦ2、ＡｌＦ3の５成分系のなかで
最も比重の重いＢａＦ2によって調整することができ
る。[0010] In the three-layer electrolysis, the specific gravity of the electrolytic bath in order to keep the three layers should be between the anode alloys and purification aluminum. Here, the specific gravity of the electrolytic bath is NaF, B
It can be adjusted by BaF 2 , which has the highest specific gravity among the five-component system of aF 2 , LiF, CaF 2 , and AlF 3 .
【００１１】本発明において、ＢａＦ2 が２７〜３１重
量％の範囲であれば７７０℃における電解浴の比重が
２．６〜３．０ｇ／ｃｍ3となることを見いだした。す
なわち、ＢａＦ2がこの範囲内にあるならば、他の成分
の影響をあまり受けることなく三層を保つための好まし
い電解浴の比重２．６〜３．０ｇ／ｃｍ3を保つことが
できる。In the present invention, it was found that the specific gravity of the electrolytic bath at 770 ° C. is 2.6 to 3.0 g / cm 3 when BaF 2 is in the range of 27 to 31% by weight. That, BaF 2 is if within this range, it is possible to maintain the specific gravity of 2.6 to 3.0 g / cm 3 of a preferred electrolytic bath to keep the three-layer without receiving much influence of the other components.
【００１２】ＮａＦ、ＢａＦ2 、ＬｉＦ、ＣａＦ2 、Ａ
ｌＦ3 の５元成分からなる電解浴において、電気伝導度
はイオン半径の小さいＮａイオン、Ｌｉイオンの濃度が
寄与する。ＮａＦ量と電気伝導度は比例関係にあること
から、ＮａＦ量を多くすれば電気伝導度は増大する。し
かしながら、ＮａＦ量を多くした場合には融点が上昇
し、かつ、精製アルミニウム中へＮａが移行し、その濃
度は１ｐｐｍ以上になるので、ＮａＦ量は１７〜２１重
量％とすることが好ましい。NaF, BaF 2 , LiF, CaF 2 , A
In an electrolytic bath composed of a quinary component of 1F 3 , electric conductivity is contributed by the concentration of Na ions and Li ions having a small ionic radius. Since the amount of NaF and the electric conductivity are in a proportional relationship, increasing the amount of NaF increases the electric conductivity. However, when the amount of NaF is increased, the melting point rises and Na migrates into the purified aluminum, and the concentration thereof becomes 1 ppm or more. Therefore, the amount of NaF is preferably 17 to 21% by weight.
【００１３】ＬｉＦ量は電気伝導度とほぼ比例関係にあ
ることから、ＬｉＦ量を多くすれば電気伝導度は増大す
る。しかしながら、ＬｉＦ量を多くした場合融点が低下
し、かつ、精製アルミニウム中へＬｉＦが移行し、その
濃度は１ｐｐｍ以上になる。Since the amount of LiF is almost proportional to the electric conductivity, increasing the amount of LiF increases the electric conductivity. However, when the amount of LiF is increased, the melting point is lowered, and LiF migrates into the purified aluminum, and the concentration becomes 1 ppm or more.
【００１４】従来から用いられてきた電気浴の電気伝導
度は０．７Ω-1ｃｍ-1程度のものであった。しかし、本
発明による電解浴を用いることにより、電気伝導度を約
３０％以上向上させることができる。The electric conductivity of the conventional electric bath has been about 0.7 Ω -1 cm -1 . However, by using the electrolytic bath according to the present invention, the electrical conductivity can be improved by about 30% or more.
【００１５】陽極合金、電解浴、精製アルミニウムの三
層は、電解浴のオーム損による発熱により溶融状態を保
っている。そこで、電解中に電解浴の消耗が少なく、消
費電力量も小さくするには電気伝導度を高くする必要が
ある。またこれら三層の溶融状態を保つため、実用上は
電解温度として７５０〜７８０℃が好ましい。The three layers of the anode alloy, the electrolytic bath and the refined aluminum are kept in a molten state by the heat generated by the ohmic loss of the electrolytic bath. Therefore, in order to reduce the consumption of the electrolytic bath during electrolysis and reduce the power consumption, it is necessary to increase the electric conductivity. Further, in order to maintain the molten state of these three layers, the electrolysis temperature is preferably 750 to 780 ° C. in practice.
【００１６】したがって、本発明において電解浴成分中
のアルカリ金属、アルカリ土類金属が精製されたアルミ
ニウムの中へ移行せず、電気伝導度が大きく、かつ、省
エネルギーの電解浴としてＮａＦが１７〜２１重量％、
ＢａＦ2 が２７〜３１重量％、ＬｉＦが１〜３重量％、
ＣａＦ2 が８重量％以下、残りがＡｌＦ3 であるものが
好ましいことを見いだした。Therefore, in the present invention, the alkali metal or alkaline earth metal in the electrolytic bath component does not migrate into the purified aluminum, has a large electric conductivity, and NaF of 17 to 21 is used as an energy-saving electrolytic bath. weight%,
BaF 2 is 27 to 31% by weight, LiF is 1 to 3% by weight,
It has been found that a CaF 2 content of 8% by weight or less and a balance of AlF 3 is preferable.
【００１７】[0017]
【発明の効果】本発明による電解浴を用いることによ
り、三層電解法によるアルミニウム精製において、電解
浴成分であるアルカリ金属やアルカリ土類金属が精製ア
ルミニウム中への移行がきわめて少なく、品質に影響を
及ぼさないので高純度の精製アルミニウムが容易に得ら
れ、かつ、電解における消費電力を減少させることがで
きるので工業上きわめて有用である。EFFECTS OF THE INVENTION By using the electrolytic bath of the present invention, in the aluminum refining by the three-layer electrolysis method, the migration of alkaline metal or alkaline earth metal, which is a component of the electrolytic bath, into the refined aluminum is extremely small and the quality is affected. Therefore, highly purified aluminum can be easily obtained, and the power consumption in electrolysis can be reduced, which is extremely useful industrially.
【００１８】[0018]
【実施例】以下、本発明を実施例により説明するが、本
発明はこれらにより限定されるものではない。なお、諸
物性の測定は次の方法および装置で行った。
Ｎａ、Ｌｉ濃度；発光分光分析法、装置：島津製作所製
ＪＱＭ−７５
浴成分；蛍光Ｘ線分析法、装置：理学電機製３０８０型
（ＬｉＦは化学分析）
浴比重；溶融した電解浴を一定量取り出し冷却後重量を
測定する。
電気伝導度；ρ＝（Ｌ×Ａ／Ｖ） Ｌ：電解浴層の高
さ
Ａ：電流密度
Ｖ：浴電圧EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited thereto. The various properties were measured by the following methods and devices. Na, Li concentration; optical emission spectroscopy, device: Shimadzu JQM-75 bath component; fluorescent X-ray analysis, device: Rigaku Denki 3080 type (LiF chemical analysis) bath specific gravity; a fixed amount of molten electrolytic bath After taking out and cooling, the weight is measured. Electrical conductivity; ρ = (L × A / V) L: Height of electrolytic bath layer A: Current density V: Bath voltage
【００１９】実施例１
陽極にＡｌ−３５％Ｃｕを用い、電解浴としてＮａＦが
１９．５重量％、ＢａＦ2が３０重量％、ＬｉＦが２．
５重量％、ＡｌＦ3が４８重量％からなるものを用い、
７７０℃で電流密度０．２４Ａ／ｃｍ2、３６０時間電
解を行った。電気伝導度は１．０４Ω-1ｃｍ-1で、精製
アルミニウム中のＮａおよびＬｉの濃度はいずれも０．
７ｐｐｍであった。Example 1 Al-35% Cu was used for the anode, NaF was 19.5 wt%, BaF 2 was 30 wt% and LiF was 2.
5% by weight and 48% by weight of AlF 3 are used,
Electrolysis was performed at 770 ° C. for a current density of 0.24 A / cm 2 for 360 hours. The electric conductivity was 1.0 4 Ω -1 cm -1 , and the concentrations of Na and Li in the purified aluminum were both 0.
It was 7 ppm.
【００２０】実施例２
陽極にＡｌ−３５％Ｃｕを用い、電解浴としてＮａＦが
１９重量％、ＢａＦ2が２９．５重量％、ＬｉＦが２．
５重量％、ＣａＦ2が２重量％、ＡｌＦ3が４７重量％か
らなるものを用い、７７０℃で電流密度０．２４Ａ／ｃ
ｍ2、９６時間電解を行った。電気伝導度は１．０１Ω
-1ｃｍ-1で、精製アルミニウム中のＮａ濃度は０．５ｐ
ｐｍ、Ｌｉの濃度は０．６ｐｐｍであった。[0020] Using the Al-35% Cu in Example 2 anode, NaF is 1 9 by weight% as an electrolytic bath, BaF 2 29.5 wt%, LiF 2.
5% by weight, 2 % by weight of CaF 2 and 47% by weight of AlF 3 were used, and the current density was 0.24 A / c at 770 ° C.
Electrolysis was performed at m 2 for 96 hours. Electrical conductivity is 1.01Ω
-1 cm -1 , Na concentration in purified aluminum is 0.5p
The concentration of pm and Li was 0.6 ppm.
【００２１】実施例３
陽極にＡｌ−３５％Ｃｕを用い、電解浴としてＮａＦが
１９重量％、ＢａＦ2が２８．６重量％、ＬｉＦが２．
４重量％、ＣａＦ2 が５重量％、ＡｌＦ3 が４５重量％
からなるものを用い、７７０℃で電流密度０．２４Ａ／
ｃｍ2 、８２時間電解を行った。電気伝導度は０．９５
Ω-1ｃｍ-1で、精製アルミニウム中のＮａ濃度は０．６
ｐｐｍ、Ｌｉの濃度は０．７ｐｐｍであった。Example 3 Al-35% Cu was used for the anode, and NaF was 19% by weight, BaF 2 was 28.6% by weight, and LiF was 2.
4% by weight, CaF 2 5% by weight, AlF 3 45% by weight
Current density of 0.24 A / at 770 ° C.
Electrolysis was performed for cm 2 for 82 hours. Electric conductivity is 0.95
Ω -1 cm -1 , Na concentration in purified aluminum is 0.6
The concentration of ppm and Li was 0.7 ppm.
【００２２】実施例4
陽極にＡｌ−３５％Ｃｕを用い、電解浴としてＮａＦが
１７重量％、ＢａＦ2が３１重量％、ＬｉＦが１．５重
量％、ＣａＦ2 が８重量％、ＡｌＦ3 が４２．５重量％
からなるものを用い、７７０℃で電流密度０．２４Ａ／
ｃｍ2 、８２時間電解を行った。電気伝導度は０．９１
Ω-1ｃｍ-1で、精製アルミニウム中のＮａ濃度は０．５
ｐｐｍ、Ｌｉの濃度は０．５ｐｐｍであった。Example 4 Al-35% Cu was used for the anode, and 17% by weight of NaF, 31% by weight of BaF 2 , 1.5% by weight of LiF, 8% by weight of CaF 2 and 8% by weight of AlF 3 were used as an electrolytic bath. 42.5% by weight
Current density of 0.24 A / at 770 ° C.
Electrolysis was performed for cm 2 for 82 hours. Electric conductivity is 0.91
Ω -1 cm -1 , Na concentration in purified aluminum is 0.5
The concentration of ppm and Li was 0.5 ppm.
【００２３】比較例１
陽極にＡｌ−３５％Ｃｕを用い、電解浴としてＮａＦが
２重量％、ＢａＦ2 が３１重量％、ＬｉＦが１１重量
％、ＣａＦ2 が１２重量％、ＡｌＦ3 が４４重量％から
なるものを用い、実施例１と同様にして電解を行った。
電解浴の電気伝導度は０．９４Ω-1ｃｍ-1であったが、
精製アルミニウム中のＮａ濃度は０．５ｐｐｍ、Ｌｉの
濃度は４．５ｐｐｍで高かった。Comparative Example 1 Al-35% Cu was used for the anode, and 2% by weight of NaF, 31% by weight of BaF 2 , 11% by weight of LiF, 12% by weight of CaF 2 and 44% by weight of AlF 3 were used as an electrolytic bath. %, Electrolysis was performed in the same manner as in Example 1.
The electric conductivity of the electrolytic bath was 0.94 Ω -1 cm -1 ,
The Na concentration in the purified aluminum was 0.5 ppm, and the Li concentration was 4.5 ppm, which was high.
【００２４】比較例２
陽極にＡｌ−３５％Ｃｕを用い、電解浴としてＮａＦが
１５．５重量％、ＢａＦ2 が３１重量％、ＬｉＦが３．
５重量％、ＣａＦ2 が１１重量％、ＡｌＦ3 が３９重量
％からなるものを用い、実施例１と同様にして電解を行
った。電解浴の電気伝導度は０．９０Ω-1ｃｍ-1であっ
たが、精製アルミニウム中のＮａ濃度は０．９ｐｐｍ、
Ｌｉの濃度は１．１ｐｐｍで高かった。Comparative Example 2 Al-35% Cu was used for the anode, NaF was 15.5 wt%, BaF 2 was 31 wt% and LiF was 3.
Electrolysis was carried out in the same manner as in Example 1 using 5 wt%, CaF 2 11 wt% and AlF 3 39 wt%. The electric conductivity of the electrolytic bath was 0.90 Ω −1 cm −1 , but the Na concentration in the purified aluminum was 0.9 ppm,
The Li concentration was high at 1.1 ppm.
【００２５】比較例３
陽極にＡｌ−３５％Ｃｕを用い、電解浴としてＮａＦが
１６重量％、ＢａＦ2が３０．４重量％、ＬｉＦが１．
６重量％、ＣａＦ2 が１１重量％、ＡｌＦ3 が４１重量
％からなるものを用い、実施例１と同様にして電解を行
った。電解浴の電気伝導度は０．８０Ω-1ｃｍ-1で、精
製アルミニウム中のＮａ濃度は０．２ｐｐｍ、Ｌｉの濃
度は０．７ｐｐｍであった。しかし、電気伝導度の大き
い向上は認められなかった。Comparative Example 3 Al-35% Cu was used for the anode, and NaF was 16% by weight, BaF 2 was 30.4% by weight, and LiF was 1.
Electrolysis was carried out in the same manner as in Example 1 using 6% by weight, 11% by weight of CaF 2 and 41% by weight of AlF 3 . The electric conductivity of the electrolytic bath was 0.80 Ω −1 cm −1 , the Na concentration in the purified aluminum was 0.2 ppm, and the Li concentration was 0.7 ppm. However, no significant improvement in electrical conductivity was observed.
【００２６】比較例４
陽極にＡｌ−３５％Ｃｕを用い、電解浴としてＮａＦが
１８重量％、ＢａＦ2が２７．５重量％、ＬｉＦが２．
５重量％、ＣａＦ2 が９重量％、ＡｌＦ3 が４３重量％
からなるものを用い、実施例１と同様にして電解を行っ
た。電解浴の電気伝導度は０．９１Ω-1ｃｍ-1で、精製
アルミニウム中のＮａ濃度は０．９ｐｐｍ、Ｌｉの濃度
は１．１ｐｐｍで高かった。Comparative Example 4 Al-35% Cu was used for the anode, and NaF was 18% by weight, BaF 2 was 27.5% by weight, and LiF was 2.
5% by weight, CaF 2 9% by weight, AlF 3 43% by weight
Electrolysis was performed in the same manner as in Example 1 using The electric conductivity of the electrolytic bath was 0.91 Ω −1 cm −1 , the Na concentration in the purified aluminum was 0.9 ppm, and the Li concentration was 1.1 ppm, which was high.
【００２７】比較例５
陽極にＡｌ−３５％Ｃｕを用い、電解浴としてＮａＦが
１６重量％、ＢａＦ2が３０．３重量％、ＬｉＦが０．
７重量％、ＣａＦ2 が１０重量％、ＡｌＦ3 が４３重量
％からなるものを用い、実施例１と同様にして電解を行
った。電解浴の電気伝導度は０．８０Ω-1ｃｍ-1で、精
製アルミニウム中のＮａ濃度は０．３ｐｐｍ、Ｌｉの濃
度は０．５ｐｐｍであった。しかし、電気伝導度の大き
い向上は認められなかった。Comparative Example 5 Al-35% Cu was used for the anode, and NaF was 16% by weight, BaF 2 was 30.3% by weight, and LiF was 0.
Electrolysis was carried out in the same manner as in Example 1 using 7 wt%, 10 wt% CaF 2 and 43 wt% AlF 3 . The electric conductivity of the electrolytic bath was 0.80 Ω −1 cm −1 , the Na concentration in the purified aluminum was 0.3 ppm, and the Li concentration was 0.5 ppm. However, no significant improvement in electrical conductivity was observed.
【００２８】 [0028]
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特公 昭27−254（ＪＰ，Ｂ１) 特公 昭51−38642（ＪＰ，Ｂ１) 特許164620（ＪＰ，Ｃ１) (58)調査した分野(Int.Cl.7，ＤＢ名) C25C 3/18 C25C 3/06 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Japanese Patent Publication 27-254 (JP, B1) Japanese Patent Publication 51-38642 (JP, B1) Patent 164620 (JP, C1) (58) Fields investigated (Int. Cl. 7 , DB name) C25C 3/18 C25C 3/06
Claims (2)
て、電解浴成分がＮａＦ：１７〜２１重量％、Ｂａ
Ｆ2 ：２７〜３１重量％、ＬｉＦ：１〜３重量％、Ｃａ
Ｆ2 ：８重量％以下、残りがＡｌＦ3 からなることを特
徴とするアルミニウム精製用電解浴。1. In the aluminum refining by the three-layer electrolysis method, the electrolytic bath component is NaF: 17 to 21% by weight, and Ba.
F 2 : 27 to 31% by weight, LiF: 1 to 3% by weight, Ca
F 2 : An electrolytic bath for refining aluminum, characterized by comprising 8% by weight or less and the balance being AlF 3 .
０．９０Ω-1ｃｍ-1以上であることを特徴とする請求項
１記載のアルミニウム精製用電解浴。2. The aluminum-purifying electrolytic bath according to claim 1, wherein the electric conductivity of the electrolytic bath at 770 ° C. is 0.90 Ω −1 cm −1 or more.
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|---|---|---|---|
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP37184498A JP3428479B2 (en) | 1998-12-28 | 1998-12-28 | Electrolytic bath for aluminum refining |
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