JP3605614B2 - Discarded Ni-MH secondary battery and method for recovering valuable resources from waste Ni-MH secondary battery electrode plate - Google Patents
Discarded Ni-MH secondary battery and method for recovering valuable resources from waste Ni-MH secondary battery electrode plate Download PDFInfo
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- JP3605614B2 JP3605614B2 JP17343396A JP17343396A JP3605614B2 JP 3605614 B2 JP3605614 B2 JP 3605614B2 JP 17343396 A JP17343396 A JP 17343396A JP 17343396 A JP17343396 A JP 17343396A JP 3605614 B2 JP3605614 B2 JP 3605614B2
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- Prior art keywords
- secondary battery
- discarded
- recovering valuable
- waste
- slurry
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- Expired - Lifetime
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- 229910018095 Ni-MH Inorganic materials 0.000 title claims description 37
- 229910018477 Ni—MH Inorganic materials 0.000 title claims description 37
- 239000002699 waste material Substances 0.000 title claims description 18
- 238000000034 method Methods 0.000 title claims description 16
- 239000002270 dispersing agent Substances 0.000 claims description 29
- 239000002002 slurry Substances 0.000 claims description 21
- 238000000926 separation method Methods 0.000 claims description 18
- 239000000956 alloy Substances 0.000 claims description 16
- 229910045601 alloy Inorganic materials 0.000 claims description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims description 15
- 239000001257 hydrogen Substances 0.000 claims description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 125000000129 anionic group Chemical group 0.000 claims description 8
- 230000005484 gravity Effects 0.000 claims description 7
- 229920001214 Polysorbate 60 Polymers 0.000 claims description 6
- 239000012634 fragment Substances 0.000 claims description 5
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 3
- BCKXLBQYZLBQEK-KVVVOXFISA-M Sodium oleate Chemical compound [Na+].CCCCCCCC\C=C/CCCCCCCC([O-])=O BCKXLBQYZLBQEK-KVVVOXFISA-M 0.000 claims description 3
- NWGKJDSIEKMTRX-AAZCQSIUSA-N Sorbitan monooleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O NWGKJDSIEKMTRX-AAZCQSIUSA-N 0.000 claims description 3
- HVUMOYIDDBPOLL-XWVZOOPGSA-N Sorbitan monostearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O HVUMOYIDDBPOLL-XWVZOOPGSA-N 0.000 claims description 3
- 229940047670 sodium acrylate Drugs 0.000 claims description 3
- 229950004959 sorbitan oleate Drugs 0.000 claims description 3
- 229950011392 sorbitan stearate Drugs 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims 2
- 239000010926 waste battery Substances 0.000 claims 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 229910052759 nickel Inorganic materials 0.000 description 5
- BFDHFSHZJLFAMC-UHFFFAOYSA-L nickel(ii) hydroxide Chemical compound [OH-].[OH-].[Ni+2] BFDHFSHZJLFAMC-UHFFFAOYSA-L 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 150000002009 diols Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/84—Recycling of batteries or fuel cells
Landscapes
- Processing Of Solid Wastes (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Secondary Cells (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、負極に水素吸蔵合金を配したニッケル−水素二次電池（本明細書では以下Ｎｉ−ＭＨ二次電池と略記する）が使用済み等のために廃棄された際に、この廃棄されたＮｉ−ＭＨ二次電池及びＮｉ−ＭＨ二次電池廃極板から有価物を回収する方法に関する。
【０００２】
【従来の技術】
Ｎｉ−ＭＨ二次電池は多孔質ニッケルまたは繊維状金属ニッケルに水酸化ニッケルを充填した正極と、ニッケルメッキした鉄のパンチプレートや多孔質金属ニッケル等に水素吸蔵合金粉末を導電剤、結着剤とともに固着した負極と、ポリプレン等で形成されたセパレーター等を有し、これらは電解液とともに鋼製容器に収納されて構成されている。
【０００３】
このＮｉ−ＭＨ二次電池は有害なカドミウムを部材として使用していないために、ニッケル−カドミウム電池とは異なり、廃棄しても深刻な公害を発生させることがない。しかしニッケルや水素吸蔵合金は貴重な資源であるために、廃棄されたＮｉ−ＭＨ二次電池及びＮｉ−ＭＨ二次電池廃極板からこれらの有価物を回収することは資源活用の観点から極めて重要である。
【０００４】
特開平８−２０８２５号で、本発明者らは、ニッケル基板、水酸化ニッケル、水素吸蔵合金、セパレーター、合成樹脂フィルム、鋼製容器などの、物理的・化学的特性が異なる多種類の部材で構成されているＮｉ−ＭＨ二次電池の廃棄物から簡易な方法で高い価値を有する有価物を回収する方法について提案している。
【０００５】
【発明が解決しようとする課題】
負極に粉末状水素吸蔵合金を配した、廃棄されたＮｉ−ＭＨ二次電池及びＮｉ−ＭＨ二次電池廃極板から有価物を回収するに際し、該Ｎｉ−ＭＨ二次電池を砕断し砕断片を水中で処理して粉末部をスラリーとし、ついでスラリー化しない部分とスラリーとに分離し、スラリーから比重分離及びまたは浮遊分離により有価物を回収する工程において、有価物と導電剤や結着剤の分散性が悪く、水素吸蔵合金の分離効率が小さいなどの問題点があった。本発明は、スラリーから効率的に有価物を回収する方法の提供を課題としている。
【０００６】
【課題を解決するための手段及び作用】
本発明は、（１）負極に粉末状水素吸蔵合金を配した、廃棄されたＮｉ−ＭＨ二次電池から有価物を回収するに際し、該二次電池を砕断し砕断片を水中で処理してスラリー化しない部分とスラリーとに分離し、スラリーから比重分離及びまたは浮遊分離により有価物を回収する工程において、砕断片を水中で処理してスラリー化しない部分とスラリーとに分離する際に分散剤を含有させることを特徴とする、廃棄されたＮｉ−ＭＨ二次電池及びＮｉ−ＭＨ二次電池廃極板から有価物を回収する方法である。
【０００７】
また（２）スラリーから比重分離及びまたは浮遊分離により有価物を回収する工程において、スラリーに分散剤を添加することを特徴とする、前記（１）に記載の廃棄されたＮｉ−ＭＨ二次電池及びＮｉ−ＭＨ二次電池廃極板から有価物を回収する方法である。
【０００８】
また（３）分散剤が、アニオン系分散剤及び又はノニオン系分散剤であることを特徴とする、前記（１）または（２）に記載の廃棄されたＮｉ−ＭＨ二次電池及びＮｉ−ＭＨ二次電池廃極板から有価物を回収する方法である。
【０００９】
また（４）アニオン系分散剤が、低重合アクリル酸ソーダ、オレイン酸ソーダの何れかあるいは双方よりなることを特徴とする、前記（３）に記載の廃棄されたＮｉ−ＭＨ二次電池及びＮｉ−ＭＨ二次電池廃極板から有価物を回収する方法である。
【００１０】
また（５）ノニオン系分散剤が、ポリオキシエチレンソルビタンオレエート、ポリオキシエチレンソルビタンステアレートの何れかあるいは双方であることを特徴とする、前記（３）に記載の廃棄されたＮｉ−ＭＨ二次電池及びＮｉ−ＭＨ二次電池廃極板から有価物を回収する方法である。
【００１１】
本発明において、負極に粉末状水素吸蔵合金を配した、廃棄されたＮｉ−ＭＨ二次電池及びＮｉ−ＭＨ二次電池廃極板から有価物を回収するに際し、該二次電池を砕断する。なお、本発明において水素吸蔵合金を配した廃極板があらかじめ解体されている場合、この負極板ないしは電池製造工程で発生する廃電極の大きさ（幅）が小さい場合には砕断せずに用いることができる事は勿論であり、また危険防止のためにはこの砕断は水をかけながらあるいは水中で行う砕断でもよい事は云うまでもない。
【００１２】
本発明において、この極板から有価物を分離する。この分離処理は例えば前記破断された廃極板をボールミルやセメントミキサー等中に装入し水が不足している場合は水を加え、内容物を撹拌混合する事が好ましく、含まれている水素吸蔵合金、Ｎｉ（ＯＨ）２、Ｃ等の内容物を、容器、極板等の破断片から分離してスラリー化する。本発明ではこの時に分散剤を添加する。これが本発明の特徴である。なお分散剤の量としては、スラリー量に対して０．１〜１０％が好ましい。
【００１３】
この水処理品を例えば１ｍｍの篩いで電極等の破断片を分離除去し、更に２００メッシュの篩を用いてスラリー化しない他の内容物を分離する（一次分離）。なお２００メッシュ篩下のスラリーに分散剤を更に添加し、有価物を次の回収工程に供することもできる。これ等の分散剤含有スラリーを、超音波処理し分散性を向上させることは、有価物回収効率を高めるのに有効である。有価物は、スラリーから比重分離または浮遊分離によって回収するが、この比重分離または浮遊分離による回収は例えばテーブル選鉱機や液体サイクロンを用いる事によって行うことができる。
【００１４】
本発明者らは分散性を高めるために種々の分散剤を実験し、特定のアニオン系分散剤、ノニオン系分散剤が好ましい事を確認した。アニオン系分散剤としては、好ましくは低重合アクリル酸ソーダ、オレイン酸ソーダ等が、また、ノニオン系分散剤としては、好ましくはポリオキシエチレンソルビタンオレエート、ポリオキシエチレンソルビタンステアレート等が効果が大きいことを実験を繰り返すことにより見出した。上記の分散剤を用いると分散剤分子が粒子の表面を被覆し、アニオン系分散剤ではその親水基の静電気反発力により、またノニオン系分散剤は吸着分子の立体反発力により、それぞれ粒子同士の接近と再凝集が妨げられ、好ましい結果が得られる。
【００１５】
【実施例】
Ｎｉ−ＭＨ二次電池を低速破砕機で水をかけながら砕断し、ついで、ボールミルに破断片を装入し、分散剤を加えて水中で２０分間撹拌処理した。これを篩い目が１ｍｍ、１００メッシュ、および２００メッシュの篩を三段に重ねた分離機にかけて、一次分離して２００メッシュ以下のスラリーを得、これを液体サイクロンにて処理し、有価物の一つの水素吸蔵合金を回収した。この際に用いた分散剤と添加量を表１に示す。
【００１６】
なお、液体サイクロンのシンク品は、再度液体サイクロンにかける繰り返しの処理を行ったが、この際の処理回数と回収品のＣ分析値を表１に示す。
【００１７】
【表１】
分散剤を添加すると表１にみられるように、回収水素吸蔵合金中のＣ濃度は低下し、有価物の水素吸蔵合金と導電剤、結着剤との分離が良好となる。なお分散剤の添加量としては、３〜５％が最適であった。
【００１９】
【発明の効果】
本発明によれば、廃棄されたＮｉ−ＭＨ二次電池及びＮｉ−ＭＨ二次電池廃極板から有価物を効率よく回収することができる。また回収された水素吸蔵合金は、リサイクル使用が可能であり、また、電極ケース、極板、水酸化ニッケル等他の有価物も、水素吸蔵合金と同様、再利用することができる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a nickel-hydrogen secondary battery (hereinafter abbreviated as Ni-MH secondary battery) in which a hydrogen storage alloy is disposed on a negative electrode when the battery is used or the like, and is discarded. The present invention relates to a method for recovering valuable resources from a used Ni-MH secondary battery and a waste electrode plate of the Ni-MH secondary battery.
[0002]
[Prior art]
The Ni-MH secondary battery has a positive electrode in which porous nickel or fibrous metal nickel is filled with nickel hydroxide, and a hydrogen-absorbing alloy powder in a nickel-plated iron punch plate, porous metal nickel, etc., as a conductive agent and a binder. And a separator formed of polypropylene or the like, which are housed in a steel container together with the electrolytic solution.
[0003]
Since this Ni-MH secondary battery does not use harmful cadmium as a member, unlike a nickel-cadmium battery, it does not cause serious pollution even when disposed. However, since nickel and hydrogen storage alloys are valuable resources, it is extremely difficult to recover these valuable resources from discarded Ni-MH secondary batteries and waste plates of Ni-MH secondary batteries from the viewpoint of resource utilization. is important.
[0004]
In Japanese Patent Application Laid-Open No. Hei 8-20825, the present inventors have developed various types of members having different physical and chemical properties such as a nickel substrate, nickel hydroxide, a hydrogen storage alloy, a separator, a synthetic resin film, and a steel container. A method for recovering valuable materials having high value from waste of the configured Ni-MH secondary battery by a simple method is proposed.
[0005]
[Problems to be solved by the invention]
When recovering valuable materials from a discarded Ni-MH secondary battery and a waste Ni-MH secondary battery electrode plate in which a powdery hydrogen storage alloy is disposed on the negative electrode, the Ni-MH secondary battery is crushed and crushed. In the process of treating the fragments in water to turn the powder portion into a slurry, then separating the non-slurried portion and the slurry, and recovering the valuable material from the slurry by specific gravity separation or floating separation, the valuable material is electrically conductive or bound. There are problems such as poor dispersibility of the agent and low separation efficiency of the hydrogen storage alloy. An object of the present invention is to provide a method for efficiently recovering valuable resources from a slurry.
[0006]
Means and Action for Solving the Problems
The present invention provides (1) when recovering valuable resources from a discarded Ni-MH secondary battery having a powdered hydrogen storage alloy disposed on the negative electrode, crushing the secondary battery and treating crushed fragments in water. In the process of separating valuable parts from the slurry by separating the non-slurried part from the slurry and collecting valuable resources from the slurry by specific gravity separation and / or floating separation, the crushed fragments are dispersed in the part that is not slurried by processing in water and the slurry is separated. A method for recovering valuable materials from discarded Ni-MH secondary batteries and waste plates of Ni-MH secondary batteries, characterized by including an agent.
[0007]
(2) The discarded Ni-MH secondary battery according to (1), wherein a dispersant is added to the slurry in the step of collecting valuables from the slurry by specific gravity separation and / or floating separation. And a method of recovering valuable resources from waste electrode plates of Ni-MH secondary batteries.
[0008]
(3) The discarded Ni-MH secondary battery and Ni-MH according to (1) or (2), wherein the dispersant is an anionic dispersant and / or a nonionic dispersant. This is a method for recovering valuable resources from waste electrode plates of secondary batteries.
[0009]
Further, (4) the discarded Ni-MH secondary battery according to (3), wherein the anionic dispersant comprises one or both of low-polymer sodium acrylate and sodium oleate. -It is a method of recovering valuable resources from the MH secondary battery waste electrode plate.
[0010]
(5) The discarded Ni-MH diol according to (3), wherein the nonionic dispersant is one or both of polyoxyethylene sorbitan oleate and polyoxyethylene sorbitan stearate. This is a method of recovering valuable resources from a secondary battery and a waste electrode plate of a Ni-MH secondary battery.
[0011]
In the present invention, the powdery hydrogen storage alloy is disposed on the negative electrode, and when the valuable material is recovered from the discarded Ni-MH secondary battery and the waste Ni-MH secondary battery electrode plate, the secondary battery is crushed. . In the present invention, when the waste electrode plate provided with the hydrogen storage alloy is disassembled in advance, if the size (width) of the negative electrode plate or waste electrode generated in the battery manufacturing process is small, the electrode is not cut off. Needless to say, it can be used, and it is needless to say that this crushing may be performed with or without water in order to prevent danger.
[0012]
In the present invention, valuable materials are separated from this electrode plate. In this separation treatment, for example, it is preferable to charge the broken waste electrode plate into a ball mill or a cement mixer, etc., add water if water is insufficient, and stir and mix the contents. The contents such as the storage alloy, Ni (OH) 2 , and C are separated from broken pieces such as a container and an electrode plate to form a slurry. In the present invention, a dispersant is added at this time. This is a feature of the present invention. The amount of the dispersant is preferably 0.1 to 10% based on the amount of the slurry.
[0013]
The water-treated product is separated and removed with, for example, a 1-mm sieve to separate broken pieces of electrodes and the like, and further separated using a 200-mesh sieve to separate other contents that are not slurried (primary separation). It should be noted that a dispersant may be further added to the slurry below the 200-mesh sieve, and the valuables may be subjected to the next recovery step. Improving the dispersibility of these dispersant-containing slurries by ultrasonic treatment is effective for increasing the valuable resource recovery efficiency. Valuables are recovered from the slurry by specific gravity separation or floating separation, and this specific gravity separation or floating separation can be performed, for example, by using a table ore separator or a liquid cyclone.
[0014]
The present inventors have experimented with various dispersants in order to enhance dispersibility, and have confirmed that specific anionic dispersants and nonionic dispersants are preferable. As anionic dispersants, preferably low-polymerized sodium acrylate, sodium oleate and the like, and as nonionic dispersants, preferably polyoxyethylene sorbitan oleate, polyoxyethylene sorbitan stearate and the like are effective. This was found by repeating the experiment. When the above dispersant is used, the dispersant molecules cover the surface of the particles, an anionic dispersant by the electrostatic repulsive force of its hydrophilic group, and a nonionic dispersant by the steric repulsive force of the adsorbed molecules, thereby causing the particles to form particles. Access and reagglomeration are prevented, and favorable results are obtained.
[0015]
【Example】
The Ni-MH secondary battery was crushed while sprinkling water with a low-speed crusher, then the broken pieces were charged into a ball mill, a dispersant was added, and the mixture was stirred in water for 20 minutes. This was passed through a separator in which sieves having a mesh of 1 mm, 100 mesh, and 200 mesh were stacked in three stages, and were primarily separated to obtain a slurry of 200 mesh or less. Two hydrogen storage alloys were recovered. Table 1 shows the dispersant used and the amount added at this time.
[0016]
In addition, the sink product of the hydrocyclone was subjected to the repetitive processing of reapplying to the hydrocyclone. Table 1 shows the number of times of the processing and the C analysis value of the recovered product.
[0017]
[Table 1]
As shown in Table 1, when the dispersant is added, the C concentration in the recovered hydrogen storage alloy decreases, and the separation of the valuable hydrogen storage alloy from the conductive agent and the binder is improved. The optimum amount of the dispersant added was 3 to 5%.
[0019]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, a valuable material can be collect | recovered efficiently from a discarded Ni-MH secondary battery and a Ni-MH secondary battery waste electrode plate. The recovered hydrogen storage alloy can be recycled, and other valuable materials such as an electrode case, an electrode plate, and nickel hydroxide can be reused similarly to the hydrogen storage alloy.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17343396A JP3605614B2 (en) | 1996-07-03 | 1996-07-03 | Discarded Ni-MH secondary battery and method for recovering valuable resources from waste Ni-MH secondary battery electrode plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17343396A JP3605614B2 (en) | 1996-07-03 | 1996-07-03 | Discarded Ni-MH secondary battery and method for recovering valuable resources from waste Ni-MH secondary battery electrode plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1021969A JPH1021969A (en) | 1998-01-23 |
| JP3605614B2 true JP3605614B2 (en) | 2004-12-22 |
Family
ID=15960378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17343396A Expired - Lifetime JP3605614B2 (en) | 1996-07-03 | 1996-07-03 | Discarded Ni-MH secondary battery and method for recovering valuable resources from waste Ni-MH secondary battery electrode plate |
Country Status (1)
| Country | Link |
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| JP (1) | JP3605614B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4608773B2 (en) * | 2000-12-12 | 2011-01-12 | 住友金属鉱山株式会社 | Method of recovering valuable metals from used nickel metal hydride secondary batteries |
| JP5311811B2 (en) * | 2007-12-17 | 2013-10-09 | 三菱マテリアル株式会社 | Method for recovering metal from spent solid oxide fuel cells |
| JP5444821B2 (en) * | 2009-04-28 | 2014-03-19 | Ｊｆｅスチール株式会社 | Method for recovering manganese oxide from dry cells |
-
1996
- 1996-07-03 JP JP17343396A patent/JP3605614B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1021969A (en) | 1998-01-23 |
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