JP6687603B2 - タングステンカーバイドの製造方法 - Google Patents
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Description
電解槽は、特に限定されないが、例えば、図1に示す構成であってもよい。図1は、アノードとしてチタンバスケットを用いており、このチタンバスケットの中にタングステンを含む有価物を含有する原料混合物が設けられている。チタンバスケットは、本発明のような高電圧、高電流及び高温の電解処理条件で安定である点で好ましい。
また、特に炭素数が6を超えるアルコールアミンを含有する電解液を用いると、この後に行われるタングステン酸溶液の焼成工程を実施したとき、タングステンカーバイドを効率良くまた収率良く製造することができる。これは、タングステン酸溶液からタングステンカーバイドを焼成によって直接製造するとき、反応の進みすぎが良好に抑制されるため、生成したタングステンカーバイドがさらに還元されてタングステンを生成することが抑制されるためである。
電解槽のアノードとして、表1に示す品位の超硬材スクラップ10kgをチタンバスケットに入れたものを用いた。
電解槽のカソードとして、チタン板を用いた。
電解液に10mass%のモノエタノールアミンを用いて純水で20Lとした。電流密度を5A/dm2として、100Aの定電流で、温度を70℃にて電解溶解を10時間行った。
その結果、カソードのチタン板表面に金属コバルトが析出した。また、電解液にはタングステンが溶解しており、且つ、電解液中に残渣が生じた。また、タングステンの溶解量は0.6kgで電流効率はほぼ100%であった。
次に、タングステンが溶解した電解液を200℃で予備加熱して水分を減少させた後、水素雰囲気で、焼成温度までの昇温速度を50℃/分とし、1000℃で焼成した。XRDにより、タングステンカーバイドが90%生成し、タングステンが10%生成したことを確認した。
電解槽のアノードとして、表2に示す品位の超硬材スクラップ5kgをチタンバスケットに入れたものを用いた。
電解槽のカソードとして、チタン板を用いた。
電解液に10mass%のモノエタノールアミンを用いて純水で10Lとした。電流密度を10A/dm2として、100Aの定電流で、温度を70℃にて電解溶解を10時間行った。
その結果、カソードのチタン板表面に金属コバルトが析出した。また、電解液にはタングステンが溶解しており、且つ、電解液中に残渣が生じた。また、タングステンの溶解量は1.1kgで電流効率はほぼ100%であった。
次に、タングステンが溶解した電解液を200℃で予備加熱して水分を減少させた後、水素雰囲気で、焼成温度までの昇温速度を50℃/分とし、1100℃で焼成した。XRDにより、タングステンカーバイドが90%生成し、タングステンが10%生成したことを確認した。
水素雰囲気で、焼成温度までの昇温速度を30℃/分とし、830℃で焼成する以外は、実施例1と同様の処理を行った。XRDにより、タングステンカーバイドが78%、タングステンが22%生成したことを確認した。
水素雰囲気での焼成温度を700℃とした以外、実施例1と同様の原料を用いて同様に処理したところ、XRDにより、タングステンカーバイドが確認できず、タングステンがほぼ100%生成したことを確認した。
Claims (12)
- タングステンを含む有価物を含有する原料混合物に対して、アルコールアミンを含む電解液を用いて電気分解を行うことで、前記電解液へタングステンを溶解させる工程と、
前記タングステンが溶解した電解液を800℃以上の温度で焼成することでタングステンカーバイドを得る工程と、
を含むことを特徴とするタングステンカーバイドの製造方法。 - 前記アルコールアミンが、モノエタノールアミン及び/又はトリエタノールアミンであることを特徴とする請求項1に記載のタングステンカーバイドの製造方法。
- 前記電解液中のアルコールアミンの濃度が1〜50mass%であることを特徴とする請求項1又は2に記載のタングステンカーバイドの製造方法。
- 前記焼成工程における焼成温度までの昇温速度が5℃/分以上であることを特徴とする請求項1〜3のいずれか一項に記載のタングステンカーバイドの製造方法。
- 前記原料混合物が、タングステン以外の有価物を1〜60mass%含有することを特徴とする請求項1〜4のいずれか一項に記載のタングステンカーバイドの製造方法。
- 前記原料混合物が、タングステン以外の有価物を1〜30mass%含有することを特徴とする請求項5に記載のタングステンカーバイドの製造方法。
- 前記原料混合物が、タングステン以外の有価物を3〜10mass%含有することを特徴とする請求項6に記載のタングステンカーバイドの製造方法。
- 前記電解液の温度を20〜80℃に調整して電気分解を行うことを特徴とする請求項1〜7のいずれか一項に記載のタングステンカーバイドの製造方法。
- 前記電解液のpHが7以上であることを特徴とする請求項1〜8のいずれか一項に記載のタングステンカーバイドの製造方法。
- 前記タングステンが溶解した電解液を800℃以上の温度で焼成することでタングステンカーバイドを得る工程において、前記タングステンカーバイドと同時にタングステンも得ることを特徴とする請求項1〜9のいずれか一項に記載のタングステンカーバイドの製造方法。
- 前記電解液へタングステンを溶解させる工程の後、前記電解液に予備加熱を行うことで水分量を減少させた後、前記焼成を行い、タングステンカーバイドを得ることを特徴とする請求項1〜10のいずれか一項に記載のタングステンカーバイドの製造方法。
- 前記電気分解で使用するアノードが、前記タングステンを含む有価物を含有する原料混合物が設けられたチタンバスケットであることを特徴とする請求項1〜11のいずれか一項に記載のタングステンカーバイドの製造方法。
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015071908 | 2015-03-31 | ||
| JP2015071908 | 2015-03-31 | ||
| PCT/JP2016/059970 WO2016158878A1 (ja) | 2015-03-31 | 2016-03-28 | タングステンカーバイドの製造方法 |
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| Publication Number | Publication Date |
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| JPWO2016158878A1 JPWO2016158878A1 (ja) | 2018-02-01 |
| JP6687603B2 true JP6687603B2 (ja) | 2020-04-22 |
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| JP2016064478A Pending JP2016194152A (ja) | 2015-03-31 | 2016-03-28 | タングステン酸溶液の製造方法 |
| JP2017509988A Active JP6687603B2 (ja) | 2015-03-31 | 2016-03-28 | タングステンカーバイドの製造方法 |
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| JP2016064478A Pending JP2016194152A (ja) | 2015-03-31 | 2016-03-28 | タングステン酸溶液の製造方法 |
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| Country | Link |
|---|---|
| US (1) | US10227235B2 (ja) |
| EP (1) | EP3279174B1 (ja) |
| JP (2) | JP2016194152A (ja) |
| KR (1) | KR102023265B1 (ja) |
| CN (2) | CN113088703A (ja) |
| TW (1) | TWI612013B (ja) |
| WO (1) | WO2016158878A1 (ja) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6784510B2 (ja) * | 2016-05-17 | 2020-11-11 | Jx金属株式会社 | ポリタングステン酸アルコールアミンの製造方法 |
| RU2752624C1 (ru) * | 2020-11-05 | 2021-07-29 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Кабардино-Балкарский государственный университет им. Х.М. Бербекова" (КБГУ) | Электрохимический способ получения карбида молибдена |
| TWI789246B (zh) * | 2022-02-18 | 2023-01-01 | 國立清華大學 | 含鎢合金的有價金屬元素回收方法 |
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| EP3279174A1 (en) | 2018-02-07 |
| JPWO2016158878A1 (ja) | 2018-02-01 |
| TW201718401A (zh) | 2017-06-01 |
| TWI612013B (zh) | 2018-01-21 |
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