JP2969436B2 - Metal Mg electrolyzer - Google Patents
Metal Mg electrolyzerInfo
- Publication number
- JP2969436B2 JP2969436B2 JP30646995A JP30646995A JP2969436B2 JP 2969436 B2 JP2969436 B2 JP 2969436B2 JP 30646995 A JP30646995 A JP 30646995A JP 30646995 A JP30646995 A JP 30646995A JP 2969436 B2 JP2969436 B2 JP 2969436B2
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- Prior art keywords
- gas
- branch pipe
- electrolytic
- metal
- electrolytic cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、Ｍｇ塩化物を含む
溶融塩から電気分解により金属Ｍｇを生成する金属Ｍｇ
電解装置、特に複数の電解槽を用い、且つ各電解槽で副
生するＣｌ2 ガスを一括吸引する複槽型の金属Ｍｇ電解
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing metallic Mg by electrolysis from a molten salt containing Mg chloride.
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolysis apparatus, and more particularly to a multi-chamber metal Mg electrolysis apparatus that uses a plurality of electrolysis cells and collectively sucks Cl 2 gas by-produced in each electrolysis cell.
【０００２】[0002]
【従来の技術】Ｍｇ塩化物を含む溶融塩から電気分解に
より金属Ｍｇを生成する工業的な金属Ｍｇ電解装置で
は、複数の電解槽が用いられ、各電解槽で同時並行して
金属Ｍｇの生成が行われる。このとき各電解槽では、金
属Ｍｇの生成に伴ってＣｌ2 ガスが副生する。各電解槽
で副生したＣｌ2 ガスは、本管に設けた吸引機により支
管を介して各電解槽を一括吸引することにより、Ｃｌ2
ガス精製設備に送られる。2. Description of the Related Art In an industrial metal Mg electrolysis apparatus for producing metal Mg from a molten salt containing Mg chloride by electrolysis, a plurality of electrolytic cells are used. Is performed. At this time, in each electrolytic cell, Cl 2 gas is by-produced with the generation of metallic Mg. By-product Cl 2 gas in each electrolytic cell, by collectively sucking each electrolytic cell via a branch pipe by suction machine which is provided in the main pipe, Cl 2
Sent to gas purification facility.
【０００３】[0003]
【発明が解決しようとする課題】このような複数の電解
槽を持つ金属Ｍｇ電解装置では、各電解槽でのＣｌ2 ガ
スの吸引圧力を−１０〜０ｍｍＨ2 Ｏ（−0.１〜０ｋＰ
ａ）の弱い負圧に管理することが、電流効率を向上させ
電力原単位の低減を図るために重要であるとされてい
る。なぜなら、この吸引圧力が大きくなると電解槽内に
大気が混入する割合が増大して電流効率が低下するから
である。しかしながら、従来は各電解槽の個別負圧制御
が不可能なため、各電解槽でのＣｌ2 ガス吸引圧力が−
１０〜０ｍｍＨ2 Ｏに管理されず、これによる電流効率
の低下が生じていた。各電解槽の個別負圧制御が不可能
であった理由は次の通りである。In such a metal Mg electrolysis apparatus having a plurality of electrolytic baths, the pressure of Cl 2 gas suction in each electrolytic bath is reduced to -10 to 0 mmH 2 O (−0.1 to 0 kP).
It is considered that it is important to control the weak negative pressure in a) in order to improve the current efficiency and reduce the power consumption. This is because if the suction pressure increases, the rate of the air mixing into the electrolytic cell increases, and the current efficiency decreases. However, conventionally, it is impossible to control the negative pressure of each electrolytic cell individually, so the Cl 2 gas suction pressure in each electrolytic cell is −
10~0mmH 2 O without being managed, this decrease in current efficiency due had occurred. The reason why individual negative pressure control of each electrolytic cell was impossible is as follows.
【０００４】各電解槽ではＣｌ2 ガスと共に粉状の塩化
物が発生する。この塩化物は配管に詰まりを発生させる
ので、配管構成を簡単にする必要がある。本管に設けた
吸引機により各電解槽を一括吸引するのもこのためであ
る。各電解槽を一括吸引しつつ各電解槽での吸引圧力を
個別制御する方法としては、支管に自動弁を設けること
が考えられる。しかし、Ｃｌ2 ガスの吸引配管に弁を付
けると、弁およびその周囲に塩化物が付着し、短期間で
動作不能になる。そのため、従来は電解槽ごとの個別負
圧制御が困難とされ、これによる電流効率の低下が放置
されていた。In each electrolytic cell, powdery chloride is generated together with Cl 2 gas. Since the chloride causes clogging of the piping, it is necessary to simplify the piping configuration. It is for this reason that the electrolyzers are collectively suctioned by a suction device provided in the main pipe. As a method of individually controlling the suction pressure in each electrolytic cell while simultaneously suctioning each electrolytic cell, it is conceivable to provide an automatic valve in a branch pipe. However, if a valve is attached to the Cl 2 gas suction pipe, chloride adheres to the valve and its surroundings, and the valve becomes inoperable in a short time. Therefore, conventionally, it has been difficult to control the individual negative pressure for each electrolytic cell, and the reduction in current efficiency due to this has been neglected.
【０００５】本発明の目的は、従来不可能とされていた
電解槽ごとの個別負圧制御を可能にし、もって電流効率
の向上を図る複槽型の金属Ｍｇ電解装置を提供すること
にある。An object of the present invention is to provide a double-tank type metal Mg electrolysis apparatus which enables individual negative pressure control for each electrolytic cell, which has been impossible in the past, and thereby improves current efficiency.
【０００６】[0006]
【課題を解決するための手段】Ｃｌ2 ガスの吸引圧力を
電解槽ごとに個別制御するために電解槽ごとに吸引機を
設けるのは、配管を複雑にするので望ましくないとの観
点から、各支管に自動弁を設け、各自動弁の塩化物によ
る詰まりを防止する対策について検討した。その結果、
ゲート式の自動弁が塩化物による詰まりを生じ難いこと
が判明した。また、自動弁は開度制御のためにポジショ
ナを持つが、ポジショナが通常使用される電空式の場合
は、電解槽に供給される大電力による磁場の影響を受
け、動作不良が起きるので、空々式ポジショナの必要な
ことも判明した。In order to individually control the suction pressure of the Cl 2 gas for each electrolytic cell, it is not desirable to provide a suction device for each electrolytic cell because this complicates the piping and is not desirable. An automatic valve was installed in the branch pipe, and measures to prevent clogging of each automatic valve with chloride were examined. as a result,
It has been found that the gate type automatic valve is unlikely to be clogged with chloride. Also, the automatic valve has a positioner for opening control, but in the case of an electropneumatic type where the positioner is usually used, operation failure occurs due to the influence of the magnetic field due to the large power supplied to the electrolytic cell, It turned out that an empty positioner was needed.
【０００７】本発明の金属Ｍｇ電解装置は、これらの知
見に基づいて従来不可能とされていた電解槽ごとの個別
負圧制御を可能にしたものであり、Ｍｇ塩化物を含む溶
融塩から電気分解により金属Ｍｇを生成する複数の電解
槽と、複数の電解槽において金属Ｍｇを生成する際に副
生するＣｌ2 ガスをＣｌ2 ガス精製設備に送るために、
本管に設けた吸引機により支管を介して複数の電解槽を
一括吸引し、且つ各支管に空々式ポジショナを持つゲー
ト式自動弁を設けたガス輸送系統と、複数の電解槽にお
けるＣｌ2 ガスの吸引圧力を検出し、各吸引圧力が目標
値に管理されるように、各支管に設けられた自動弁の開
度を制御する制御系統とを具備する点に構成上の特徴が
ある。[0007] Based on these findings, the metal Mg electrolysis apparatus of the present invention enables individual negative pressure control for each electrolytic cell, which was previously impossible. In order to send Cl 2 gas by-produced when producing metal Mg in the plurality of electrolytic cells and Cl 2 gas purification equipment to the Cl 2 gas purification facility,
A gas transport system in which a plurality of electrolytic cells are collectively sucked through a branch pipe by a suction device provided in a main pipe, and a gate type automatic valve having an empty positioner is provided in each branch pipe, and a Cl 2 gas in a plurality of electrolytic cells. And a control system for controlling the degree of opening of an automatic valve provided in each branch so that each suction pressure is controlled to a target value.
【０００８】ゲート式自動弁は主としてスラリー配管等
に多く用いられるバルブである。構造は配管と交差する
弁が開放時にゲートのように配管から退避するようにな
っている。この構造のため、仮に弁にスラリー等が付着
したとしても弁の開放時にはその付着物が配管によりか
き落とされる。[0008] The gate type automatic valve is a valve mainly used for slurry piping and the like. The structure is such that a valve that intersects the pipe retreats from the pipe like a gate when opened. Due to this structure, even if slurry or the like adheres to the valve, the adhered substance is scraped off by the pipe when the valve is opened.
【０００９】空々式ポジショナとは、電空変換器により
電気信号を空気信号に変換したものを、ポジショナ（バ
ルブの開度を調整するもの）に伝達する装置である。An empty positioner is a device for transmitting an electric signal converted to an air signal by an electropneumatic converter to a positioner (adjusting the opening of a valve).
【００１０】[0010]
【発明の実施の形態】以下に本発明の実施の形態を図面
に基づいて説明する。図１は本発明を実施した金属Ｍｇ
電解装置の１例についてそのガス輸送系統およびガス輸
送系統に設けた自動弁の制御系統を示す模式図、図２は
電解槽および制御系統の詳細構成を示す模式図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a metal Mg according to the present invention.
FIG. 2 is a schematic diagram showing a gas transport system and a control system of an automatic valve provided in the gas transport system for one example of the electrolysis apparatus, and FIG. 2 is a schematic diagram showing a detailed configuration of an electrolytic cell and a control system.
【００１１】本金属Ｍｇ電解装置は、図１に示すよう
に、複数の電解槽１，１…を具備する。各電解槽１は、
図２に示すように、溶融塩２中のＭｇＣｌ2 を陽極およ
び陰極により電気分解する。As shown in FIG. 1, the metallic Mg electrolysis apparatus includes a plurality of electrolytic cells 1, 1,. Each electrolytic cell 1
As shown in FIG. 2, MgCl 2 in the molten salt 2 is electrolyzed by an anode and a cathode.
【００１１】電気分解により陰極の側に生じた溶融状態
の金属Ｍｇは流入口５を通り溶融塩２の上に浮上して溶
融Ｍｇ層６を形成する。一方、陽極の側に生じたＣｌ2
ガスは支管７を通って母管８に吸引され、更にその母管
８を通ってＣｌ2 精製設備へ送られる。複数の電解槽
１，１…を一括吸引するために、母管８の精製設備入側
には吸引機としてのブロア９が設置されている。The molten metal Mg generated on the cathode side by electrolysis floats on the molten salt 2 through the inlet 5 to form a molten Mg layer 6. On the other hand, Cl 2 formed on the side of the anode
The gas is sucked into the main pipe 8 through the branch pipe 7 and further sent to the Cl 2 purification facility through the main pipe 8. In order to collectively suck the plurality of electrolytic cells 1, 1,..., A blower 9 as a suction machine is provided on the inlet side of the purification equipment of the mother pipe 8.
【００１２】本金属Ｍｇ電解装置においては、複数の電
解槽１，１…におけるＣｌ2 ガスの吸引圧力が個別に制
御される。In the present metallic Mg electrolysis apparatus, the suction pressure of Cl 2 gas in the plurality of electrolytic cells 1, 1... Is individually controlled.
【００１３】この制御のために、各電解槽１にはＣｌ2
ガスの吸引圧力を検出する圧力計１０が設けられ、各電
解槽１で発生したＣｌ2 ガスを母管８に導く支管７には
空々式ポジショナを持つゲート式の自動弁１１が設けら
れている。支管７と母管８の接続部にはダストバンカ１
２が配設されている。支管７はダストバンカ１２に向け
て下降傾斜しており、自動弁１１はダストバンカ１２の
直前に設置されている。ダストバンカ１２とは、Ｃｌ2
ガスと共に発生する粉体の塩化物を蓄積させる容器のよ
うなものである。For this control, each electrolytic cell 1 contains Cl 2
A pressure gauge 10 for detecting a gas suction pressure is provided, and a branch pipe 7 for guiding Cl 2 gas generated in each electrolytic cell 1 to a mother pipe 8 is provided with a gate type automatic valve 11 having an empty positioner. . A dust bunker 1 is provided at the connection between the branch pipe 7 and the mother pipe 8.
2 are provided. The branch pipe 7 is inclined downward toward the dust bunker 12, and the automatic valve 11 is installed immediately before the dust bunker 12. Dust bunker 12 is Cl 2
It is like a container for storing the chlorides of the powder generated with the gas.
【００１４】圧力計１０で検出されたＣｌ2 ガスの吸引
圧力は自動弁１１のポジショナを制御する調節計１３を
介してパーソナルコンピュータ１４に与えられる。パー
ソナルコンピュータ１４は全ての吸引圧力を−１０〜０
ｍｍＨ2 Ｏ内の目標値（例えば−４ｍｍＨ2 Ｏ）とする
のに必要なポジショナの作動量を逐一計算し、調節計１
３，１３…に指令する。調節計１３，１３…はパーソナ
ルコンピュータ１４からの指令に基づいて、対応する自
動弁１１，１１…のポジショナを制御する。The Cl 2 gas suction pressure detected by the pressure gauge 10 is supplied to a personal computer 14 via a controller 13 for controlling a positioner of an automatic valve 11. The personal computer 14 sets all suction pressures to -10 to 0
mmH one by one to calculate the operation amount of the positioner necessary to a target value within 2 O (e.g. -4mmH 2 O), adjusting meter 1
Command to 3,13 ... Controllers 13, 13,... Control the positioners of the corresponding automatic valves 11, 11,.
【００１５】このような構成の本金属Ｍｇ電解装置は次
のような特徴を有する。The metallic Mg electrolysis apparatus having such a configuration has the following features.
【００１６】複数の電解槽１，１…に対応して設けた自
動弁１１，１１…のポジショナ制御により、電解槽１，
１…におけるＣｌ2 ガスの吸引圧力が全て微小な負圧の
理想値もしくはその近傍に管理される。そのため、電解
槽１，１…においては大気混入が可及的に抑制され、電
流効率が向上する。また、溶融塩２の溶面レベルが一定
に管理されることからも電流効率が向上する。なぜな
ら、電解槽内の浴対流を適切に保持できるからである。The position of the automatic valves 11, 11,... Provided for the plurality of electrolytic cells 1, 1,.
All the suction pressures of Cl 2 gas in 1... Are controlled to be at or near the ideal value of the minute negative pressure. For this reason, in the electrolytic cells 1, 1,..., Mixing with the air is suppressed as much as possible, and the current efficiency is improved. In addition, since the molten surface level of the molten salt 2 is controlled to be constant, the current efficiency is improved. This is because bath convection in the electrolytic cell can be appropriately maintained.
【００１７】自動弁１１，１１…がゲート式のため、Ｃ
ｌ2 ガスと共に発生する粉状の塩化物によるバルブ詰ま
りが抑制される。そのため、長期間の連続使用が可能に
なる。また、自動弁１１，１１…のポジショナが空々式
のため、電解槽１，１…で使用される大電力による磁界
の影響を受けることなく、ポジショナが正しく動作す
る。更に、１つのブロア９で複数の電解槽１，１…を一
括吸引するので、配管系が簡単である。かくして、これ
までは不可能とされていた電解槽１，１…の個別負圧制
御が可能となり、前述した電流効率向上の効果を享受で
きる。Since the automatic valves 11, 11,...
Valve clogging due to powdery chloride generated together with the l 2 gas is suppressed. Therefore, long-term continuous use becomes possible. Also, since the positioners of the automatic valves 11, 11,... Are empty, the positioners operate correctly without being affected by the magnetic field due to the large electric power used in the electrolytic cells 1, 1,. Further, since the plurality of electrolytic cells 1, 1... Are collectively sucked by one blower 9, the piping system is simple. Thus, individual negative pressure control of the electrolytic cells 1, 1... Which has been impossible until now becomes possible, and the effect of improving the current efficiency described above can be enjoyed.
【００１８】更に、本金属Ｍｇ電解装置においては、支
管７が本管８に向けて下降傾斜しているので、支管７に
おける塩化物の滞積も効果的に回避されるし、支管７と
本管８の接続部にダストバンカ１２が設けられ、支管７
を通過した塩化物がここに捕捉されるので、本管８にお
ける塩化物の滞積も効果的に回避される。また支管７の
下降傾斜部に自動弁１１を設置しているため、自動弁１
１の詰まりが一層効果的に回避される。Further, in the present metallic Mg electrolysis apparatus, since the branch pipe 7 is inclined downward toward the main pipe 8, the accumulation of chloride in the branch pipe 7 can be effectively avoided, and the branch pipe 7 and the main pipe 8 can be prevented. A dust bunker 12 is provided at a connection portion of the pipe 8, and a branch pipe 7 is provided.
Since chloride passing through the main pipe 8 is trapped here, the accumulation of chloride in the main pipe 8 is also effectively avoided. In addition, since the automatic valve 11 is installed in the descending inclined portion of the branch pipe 7, the automatic valve 1
1 is more effectively avoided.
【００１９】従来の金属Ｍｇ電解装置においては、電解
槽１１，１１におけるＣｌ2 ガスの吸引圧力の管理値を
−１０〜０ｍｍＨ2 Ｏ（−0.１〜０ｋＰａ）と広い範囲
に設定していたが、それでも管理値のアウト率は５０〜
７５％に達し、電流原単位は１０３１０ｋＷＨ／Ｔにと
どまっていた。これに対し、本金属Ｍｇ電解装置におい
ては、Ｃｌ2 ガスの吸引圧力の管理値を−４ｍｍＨ2 Ｏ
（−0.０９ｋＰａ）の一定値に設定したにもかかわら
ず、管理値のアウト率は２５％にとどまり、その結果、
電力原単位は１０１８５ｋＷＨ／Ｔに改善された。電流
効率で言えば１％の向上である。In the conventional metal Mg electrolysis apparatus, the control value of the suction pressure of Cl 2 gas in the electrolytic cells 11 and 11 is set to a wide range of −10 to 0 mmH 2 O (−0.1 to 0 kPa). However, the control value out rate is still 50 ~
It reached 75%, and the basic unit of current remained at 10310 kWH / T. On the other hand, in the present metal Mg electrolysis apparatus, the control value of the suction pressure of Cl 2 gas is set to −4 mmH 2 O
(-0.09 kPa), the control value out rate is only 25%, and as a result,
The power consumption rate has been improved to 10185 kWH / T. In terms of current efficiency, this is an improvement of 1%.
【００２０】[0020]
【発明の効果】以上に説明した通り、本発明の金属Ｍｇ
電解装置は、複数の電解槽を別個に吸引制御し、しかも
その個別制御に使用する自動弁の長期間安定な動作を保
証するので、各電解槽における吸引圧力を極く弱い理想
的な負圧に管理でき、これにより電力原単位の低減に大
きな効果を発揮する。As described above, the metal Mg of the present invention is used.
The electrolyzer controls the suction of multiple electrolytic cells separately and guarantees long-term stable operation of the automatic valve used for the individual control. This has a significant effect on reducing power consumption.
【図１】本発明を実施した金属Ｍｇ電解装置の１例につ
いてそのガス輸送系統およびガス輸送系統に設けた自動
弁の制御系統を示す模式図である。FIG. 1 is a schematic diagram showing a gas transportation system and a control system of an automatic valve provided in the gas transportation system in one example of a metal Mg electrolysis apparatus embodying the present invention.
【図２】電解槽および制御系統の詳細構成を示す模式図
である。FIG. 2 is a schematic diagram showing a detailed configuration of an electrolytic cell and a control system.
１ 電解槽 ２ 溶融塩 ６ 溶融Ｍｇ層 ７ 支管 ８ 本管 ９ ブロア（吸引機） １０ 圧力計 １１ 自動弁 １２ ダストバンカ １３ 調節計 １９ パーソナルコンピュータ DESCRIPTION OF SYMBOLS 1 Electrolyzer 2 Molten salt 6 Molten Mg layer 7 Branch pipe 8 Main pipe 9 Blower (suction machine) 10 Pressure gauge 11 Automatic valve 12 Dust bunker 13 Controller 19 Personal computer
Claims (1)
より金属Ｍｇを生成する複数の電解槽と、複数の電解槽
において金属Ｍｇを生成する際に副生するＣｌ2 ガスを
Ｃｌ2 ガス精製設備に送るために、本管に設けた吸引機
により支管を介して複数の電解槽を一括吸引し、且つ各
支管に空々式ポジショナを持つゲート式自動弁を設けた
ガス輸送系統と、複数の電解槽におけるＣｌ2 ガスの吸
引圧力を検出し、各吸引圧力が目標値に管理されるよう
に、各支管に設けられた自動弁の開度を制御する制御系
統とを具備することを特徴とする金属Ｍｇ電解装置。1. A plurality of electrolytic cells for generating metal Mg from a molten salt containing Mg chloride by electrolysis, and a Cl 2 gas purification by-producing Cl 2 gas when generating the metal Mg in the plurality of electrolytic cells. In order to send to the equipment, a plurality of electrolytic tanks are collectively sucked through a branch pipe by a suction device provided in the main pipe, and a gas transport system provided with a gate type automatic valve having an empty positioner in each branch pipe, A control system for controlling an opening of an automatic valve provided in each branch pipe so as to detect a suction pressure of Cl 2 gas in the electrolytic cell and to control each suction pressure to a target value. Mg electrolysis device to be used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30646995A JP2969436B2 (en) | 1995-10-30 | 1995-10-30 | Metal Mg electrolyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30646995A JP2969436B2 (en) | 1995-10-30 | 1995-10-30 | Metal Mg electrolyzer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09125281A JPH09125281A (en) | 1997-05-13 |
| JP2969436B2 true JP2969436B2 (en) | 1999-11-02 |
Family
ID=17957395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30646995A Expired - Lifetime JP2969436B2 (en) | 1995-10-30 | 1995-10-30 | Metal Mg electrolyzer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2969436B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU737352B2 (en) * | 1997-04-30 | 2001-08-16 | Alcan International Limited | Metallic MG Electrolyzing device |
| JP5144246B2 (en) * | 2007-12-27 | 2013-02-13 | 東邦チタニウム株式会社 | Molten salt electrolysis apparatus and method of operating molten salt electrolysis apparatus |
-
1995
- 1995-10-30 JP JP30646995A patent/JP2969436B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09125281A (en) | 1997-05-13 |
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