JP2526259B2 - Crucible for producing Pt, Pd-based granular noble metal particles - Google Patents
Crucible for producing Pt, Pd-based granular noble metal particlesInfo
- Publication number
- JP2526259B2 JP2526259B2 JP62310101A JP31010187A JP2526259B2 JP 2526259 B2 JP2526259 B2 JP 2526259B2 JP 62310101 A JP62310101 A JP 62310101A JP 31010187 A JP31010187 A JP 31010187A JP 2526259 B2 JP2526259 B2 JP 2526259B2
- Authority
- JP
- Japan
- Prior art keywords
- crucible
- nozzle
- noble metal
- producing
- metal particles
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、Pt、Pt合金、Pd、Pd合金等の貴金属粒状
塊、特に直径8mm以下の貴金属粒状塊を作る為のるつぼ
に関する。TECHNICAL FIELD The present invention relates to a crucible for producing a noble metal granular lump such as Pt, Pt alloy, Pd, Pd alloy, etc., particularly a noble metal granular lump having a diameter of 8 mm or less.
（従来の技術とその問題点） 従来、上記貴金属粒状塊を作るには、先ず溶解炉で貴
金属インゴットを溶解し、この溶湯を保持炉に移しかえ
て再溶解し、底部のノズルより溶湯を連続的に水中に落
下させて、貴金属粒状塊を作っていた。この方法では２
回溶解と溶湯の移しかえがあるので、手間隙がかかりし
かも溶湯の移しかえの際酸化するという問題点があっ
た。上記の酸化を防止する為に、保持炉中の貴金属溶湯
に脱酸剤を添加することが行われているが、貴金属溶湯
が脱酸剤に汚染されるものである。さらに上記の溶解炉
や保持炉はジルコニアより成るので、高耐火性を有する
が、熱衝撃抵抗に弱いので、特に保持炉のノズル部が損
傷しがちである。(Prior art and its problems) Conventionally, in order to produce the above-mentioned noble metal granular lump, first, the noble metal ingot is melted in a melting furnace, this molten metal is transferred to a holding furnace and remelted, and the molten metal is continuously fed from a nozzle at the bottom. It was made to fall into water and made a noble metal granular mass. 2 in this method
Since there is a need for remelting and transfer of the molten metal, there is a problem that it takes a lot of time and oxidizes during the transfer of the molten metal. In order to prevent the above-mentioned oxidation, a deoxidizer is added to the precious metal melt in the holding furnace, but the precious metal melt is contaminated with the deoxidizer. Further, since the melting furnace and the holding furnace are made of zirconia and thus have high fire resistance, they are vulnerable to thermal shock resistance, so that the nozzle portion of the holding furnace tends to be damaged.
この為、層状に構成したジルコニアるつぼにて貴金属
インゴットを溶解し、底部のノズルより溶解を連続的に
水中に落下させて、貴金属粒状塊を作ることが行われて
いる。Therefore, a noble metal ingot is melted in a layered zirconia crucible, and the melt is continuously dropped from a nozzle at the bottom into water to form a noble metal granular mass.
しかし、この層状のジルコニアるつぼでも熱衝撃に対
しては不十分で、ノズル部の損傷はまぬがれることがで
きなかった。However, even this layered zirconia crucible was insufficient for thermal shock, and damage to the nozzle portion could not be prevented.
（発明の目的） 本発明は、上記問題点を解決すべくなされたもので、
耐火性を有すると共に熱衝撃性に優れ、るつぼ本体は勿
論のこと、ノズル部の損傷をも確実に防止できるように
したPt、Pd系貴金属粒状塊製造用るつぼを提供すること
を目的とするものである。(Object of the Invention) The present invention has been made to solve the above problems,
An object of the present invention is to provide a crucible for manufacturing Pt and Pd-based noble metal granular lumps, which has fire resistance and excellent thermal shock resistance, and can reliably prevent damage to the nozzle part as well as the crucible body. Is.
（問題点を解決するための手段） 上記問題点を解決するための本発明のPt、Pd系貴金属
粒状塊製造用るつぼは、ジルコニアより成る内側るつぼ
をアルミナと酸化珪素より成る外側るつぼにて被って二
重るつぼとなし、この二重るつぼの底に内側るつぼと一
体のノズルを形成し、該ノズルを外側るつぼで被ったこ
とを特徴するものである。(Means for Solving Problems) A crucible for producing Pt and Pd-based noble metal granular lumps according to the present invention for solving the above problems covers an inner crucible made of zirconia with an outer crucible made of alumina and silicon oxide. It is characterized in that a double crucible is formed, a nozzle integral with the inner crucible is formed on the bottom of the double crucible, and the nozzle is covered with the outer crucible.
（作用） 上述の如く構された本発明のPt、Pd系貴金属粒状塊製
造用るつぼは、内側るつぼが高耐火性を有し、これを被
った外側るつぼが熱衝撃抵抗が大きいので、熱衝撃抵抗
の小さい内側るつぼが確実に保護される。またこの二重
るつぼの底に内側るつぼと一体に設けたノズルの外周面
が外側るつぼで被われているので、熱衝撃を抵抗の小さ
いノズルが確実に保護される。従って、二重るつぼ内で
貴金属インゴットを溶解し、底部のノズルより溶湯を連
続的に水中に落下させて、貴金属粒状塊を作った際、内
側るつぼは勿論のことノズル部が損傷することが無い。(Function) In the crucible for producing the Pt and Pd-based noble metal granular lumps of the present invention configured as described above, the inner crucible has high fire resistance, and the outer crucible covered with this has a large thermal shock resistance, so that the thermal shock The low resistance inner crucible is reliably protected. Further, since the outer peripheral surface of the nozzle provided integrally with the inner crucible on the bottom of the double crucible is covered with the outer crucible, the nozzle having a small resistance to thermal shock is surely protected. Therefore, when the precious metal ingot is melted in the double crucible and the molten metal is continuously dropped from the bottom nozzle into the water to form the precious metal granular mass, the nozzle portion as well as the inner crucible is not damaged. .
（実施例） 本発明のPt、Pd系貴金属粒状塊製造用るつぼの一実施
例を図によって説明すると、第１図に示す如く内径60m
m、深さ155mm、厚さ10mmのジルコニアより成る内側るつ
ぼ１を、内径82mm、深さ166mm、厚さ10mmのアルミナと
酸化硅素より成る外側るつぼ２にて被って二重るつぼ３
となし、この二重るつぼ３の底に内側るつぼ１と一体の
内径4mm、長さ20mm、肉厚 mmのノズル４を形成し、
このノズル４を外側るつぼ２の底部で被っている。(Example) An example of a crucible for producing a Pt, Pd-based noble metal granular lump of the present invention will be described with reference to the drawing. As shown in FIG.
An inner crucible 1 made of zirconia with a depth of m, 155 mm and a thickness of 10 mm is covered with an outer crucible 2 made of alumina and silicon oxide having an inner diameter of 82 mm, a depth of 166 mm and a thickness of 10 mm, and a double crucible 3
In the bottom of the double crucible 3, a nozzle 4 having an inner diameter of 4 mm, a length of 20 mm and a wall thickness of mm is formed.
The nozzle 4 is covered by the bottom of the outer crucible 2.
尚、ノズル４の外周面と外側るつぼ２の底部とは、ア
ルミナと酸化硅素のスラリーを塗布介在の上、焼成して
結合している。The outer peripheral surface of the nozzle 4 and the bottom portion of the outer crucible 2 are bonded together by applying a slurry of alumina and silicon oxide and then baking the slurry.
かように構成されたPt、Pd系貴金属粒状塊製造用るつ
ぼ５によりPt、Pd系貴金属粒状塊を製造するには、第２
図に示す如く高周波誘導加熱装置６にセットし、該装置
６の下方に500mm隔ててノズル４と同心に直径750mm、深
さ900mmの水槽７を配設した上、るつぼ５内に1.5kgのPt
インゴットを入れ、高周波誘導加熱装置６を運転して、
るつぼ５内のPtインゴットを溶解する。Ptインゴットが
完全に溶解すると、そのPt溶湯が底部のノズル４より連
続的に水槽７内の水中に落下し、直径4mm以下のPt粒状
塊が作られる。このPt粒状塊の製造に於いて、高耐火性
を有するが熱衝撃抵抗の小さい内側るつぼ１が熱衝撃抵
抗の大きい外側るつぼ２で被われ、且つ内側るつぼ１と
一体のノズル４が外側るつぼ２の底部で被われているの
で、内側るつぼ１及びノズル４が確実に保護され、従っ
て内側るつぼ１は勿論のことノズル４は熱衝撃により損
傷することが無い。In order to produce Pt and Pd-based noble metal granular lumps by the crucible 5 for producing Pt and Pd-based noble metal granular lumps thus constructed,
As shown in the figure, it is set in the high-frequency induction heating device 6, a water tank 7 having a diameter of 750 mm and a depth of 900 mm is concentrically arranged below the device 6 at a distance of 500 mm, and 1.5 kg of Pt is placed in the crucible 5.
Insert the ingot, operate the high frequency induction heating device 6,
Melt the Pt ingot in the crucible 5. When the Pt ingot is completely melted, the Pt molten metal continuously drops from the nozzle 4 at the bottom into the water in the water tank 7, and a Pt granular mass having a diameter of 4 mm or less is formed. In the production of this Pt granular mass, the inner crucible 1 having high fire resistance but low thermal shock resistance is covered with the outer crucible 2 having high thermal shock resistance, and the nozzle 4 integrated with the inner crucible 1 is the outer crucible 2. Since the inner crucible 1 and the nozzle 4 are protected by the bottom of the nozzle, the nozzle 4 as well as the inner crucible 1 is not damaged by thermal shock.
尚、上記実施例ではノズル４の内径を4mmにしたが、
本発明はこれに限るものではなく、溶湯がノズル４から
落下でき水中で凝固して粒状塊になるようにする目的か
ら内径が１〜8mmが好ましいものである。Although the inner diameter of the nozzle 4 was set to 4 mm in the above embodiment,
The present invention is not limited to this, and preferably has an inner diameter of 1 to 8 mm for the purpose of allowing the molten metal to drop from the nozzle 4 and solidifying in water to form a granular mass.
（発明の効果） 以上の説明で判るように本発明のPt、Pd系貴金属粒状
塊製造用るつぼは、耐火性を有するジルコニアより成る
内側るつぼを熱衝撃抵抗の大きいアルミナより成る外側
るつぼで被った二重るつぼであり、しかも内側るつぼの
底に設けたノズルが外側るつぼで被われているので、P
t、Pd系貴金属を高周波誘導加熱により溶解し、ノズル
よりその溶湯を連続的に水槽に落下して粒状塊を作った
際、るつぼ本体及びノズルが熱衝撃による損傷が確実に
防止される。また本発明のるつぼは前記の如くPt、Pd系
貴金属を溶解し、ノズルよりその溶湯を水槽に落下させ
るので、従来のジルコニアるつぼでPt、Pd系貴金属を溶
解し、保持炉にて溶湯を移しかえた場合のように、溶湯
に脱酸剤を添加することは不要であり、従ってPt、Pd系
貴金属溶湯が脱酸剤により汚染されることがない。しか
も溶湯の移しかえが無いので、手間隙がかからず、Pt、
Pd系貴金属粒状塊を能率よく製造でき、工業的生産が可
能である。(Effects of the Invention) As can be seen from the above description, the crucible for producing Pt and Pd-based noble metal granular lumps of the present invention is obtained by covering the inner crucible made of zirconia having fire resistance with the outer crucible made of alumina having high thermal shock resistance. Since it is a double crucible and the nozzle provided at the bottom of the inner crucible is covered with the outer crucible, P
When the t, Pd-based noble metal is melted by high frequency induction heating and the molten metal is continuously dropped from the nozzle into the water tank to form a granular mass, the crucible body and the nozzle are reliably prevented from being damaged by thermal shock. Further, the crucible of the present invention dissolves Pt and Pd-based noble metals as described above, and since the molten metal is dropped from a nozzle into a water tank, Pt and Pd-based precious metals are melted in a conventional zirconia crucible and the molten metal is transferred in a holding furnace. It is not necessary to add a deoxidizing agent to the molten metal as in the case of changing, so that the Pt, Pd-based precious metal molten metal is not contaminated by the deoxidizing agent. Moreover, since there is no need to transfer the molten metal, it does not take a lot of hands, and Pt,
Pd-based noble metal granular lumps can be manufactured efficiently, and industrial production is possible.
第１図は本発明のPt、Pd系貴金属粒状塊製造用るつぼの
一実施例を示す縦断面図、第２図はそのるつぼを高周波
誘導加熱装置にセットして、粒状塊を製造する状態を示
す縦断面図である。FIG. 1 is a vertical cross-sectional view showing an embodiment of a crucible for producing Pt and Pd-based noble metal granular lumps of the present invention, and FIG. 2 shows a state in which the crucible is set in a high frequency induction heating device to produce granular lumps. FIG.
Claims (1)
と酸化珪素より成る外側るつぼにて被って二重るつぼと
なし、この二重るつぼの底に内側るつぼと一体のノズル
を形成し、該ノズルを外側るつぼで被ったことを特徴と
するPt、Pd系貴金属粒状塊製造用るつぼ。1. An inner crucible made of zirconia is covered with an outer crucible made of alumina and silicon oxide to form a double crucible, and a nozzle integral with the inner crucible is formed at the bottom of the double crucible, and the nozzle is placed outside. Crucible for producing Pt and Pd-based noble metal granular lumps characterized by being covered with a crucible.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62310101A JP2526259B2 (en) | 1987-12-08 | 1987-12-08 | Crucible for producing Pt, Pd-based granular noble metal particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62310101A JP2526259B2 (en) | 1987-12-08 | 1987-12-08 | Crucible for producing Pt, Pd-based granular noble metal particles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01150788A JPH01150788A (en) | 1989-06-13 |
| JP2526259B2 true JP2526259B2 (en) | 1996-08-21 |
Family
ID=18001195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62310101A Expired - Lifetime JP2526259B2 (en) | 1987-12-08 | 1987-12-08 | Crucible for producing Pt, Pd-based granular noble metal particles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2526259B2 (en) |
-
1987
- 1987-12-08 JP JP62310101A patent/JP2526259B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01150788A (en) | 1989-06-13 |
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