JP2526258B2 - Crucible for producing Pt, Pd-based granular noble metal particles - Google Patents
Crucible for producing Pt, Pd-based granular noble metal particlesInfo
- Publication number
- JP2526258B2 JP2526258B2 JP62302564A JP30256487A JP2526258B2 JP 2526258 B2 JP2526258 B2 JP 2526258B2 JP 62302564 A JP62302564 A JP 62302564A JP 30256487 A JP30256487 A JP 30256487A JP 2526258 B2 JP2526258 B2 JP 2526258B2
- Authority
- JP
- Japan
- Prior art keywords
- crucible
- nozzle
- noble metal
- filled
- producing
- 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
Landscapes
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Devices For Use In Laboratory Experiments (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
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
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 mass such as Pt, Pt alloy, Pd, and Pd alloy.
(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。(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 are times of remelting and transfer of molten metal, it takes time and effort,
Moreover, there was a problem in that when the molten metal was transferred, it was oxidized.
上記の酸化を防止する為に、保持炉中に脱酸剤を添加
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
が弱いので、損傷し易く、特に保持炉のノズルが損傷し
易いものである。またジルコニアより成る溶解炉や保持
炉は熱の放出が著しいので、溶湯が冷めないように高温
状態を維持することが必要である。In order to prevent the above oxidation, a deoxidizer is added to 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 have high fire resistance, they are easily damaged due to weak thermal shock resistance, and particularly the nozzle of the holding furnace is easily damaged. Further, since the melting furnace and the holding furnace made of zirconia release a large amount of heat, it is necessary to maintain a high temperature state so as not to cool the molten metal.
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湯を連続的に
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。For this reason, a noble metal ingot is melted in a layered zirconia crucible, and a molten metal 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の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。また内層と外層とで熱膨張差が生じ、る
つぼが変形するという問題があった。However, even this layered zirconia crucible was insufficient for thermal shock, and damage to the nozzle portion could not be prevented. Further, there is a problem that a difference in thermal expansion occurs between the inner layer and the outer layer and the crucible is deformed.
(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耐熱衝撃性に優れ、るつぼ本体は
勿論のことノズル損傷をも確実に防止でき、しかも熱の
放出を抑えることができ、その上るつぼの熱膨張を吸収
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,
Pt that has fire resistance and excellent thermal shock resistance, can surely prevent not only the crucible body but also the nozzle damage, and can suppress the release of heat, and absorb the thermal expansion of the upper crucible, It is an object to provide a crucible for producing a Pd-based noble metal granular mass.
(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、該ノズルの外周と外側るつぼの底
のノズル挿通孔との間隙にアルミナと酸化珪素のスラリ
ーを充填して焼成し、内側るつぼの円弧状底部と外側る
つぼの円弧状底部との間隙にジルコニア粉末を充填し、
それより上方の内側るつぼと外側るつぼとの間隙に石綿
を充填したことを特徴とするものである。(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. A double crucible, and a nozzle integral with the inner crucible is formed at the bottom of this double crucible, and the gap between the outer periphery of the nozzle and the nozzle insertion hole at the bottom of the outer crucible is filled with slurry of alumina and silicon oxide. Firing, filling the gap between the arcuate bottom of the inner crucible and the arcuate bottom of the outer crucible with zirconia powder,
It is characterized in that a gap between the inner crucible and the outer crucible above it is filled with asbestos.
(作用) 上述の如く構成された本発明の、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
周がアルミナと酸化珪素の焼成物を介して外側るつぼの
底で被われているので、熱衝撃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
のことノズルが損傷することがない。また内側るつぼと
外側るつぼとの間に、底部ではジルコニア粉末が、それ
より上部では石綿が充填されているので、これらが遮熱
作用をし、内側るつぼの熱の放出が抑えられ、溶湯が冷
めるのが防止される。さらに内側るつぼと外側るつぼと
は熱膨張差があるが、両者の間に石綿が充填されている
ので、これにより熱膨張を吸収でき、内外のるつぼの変
形を防止できる。(Operation) The Pt, Pd-based noble metal granular lump producing crucible of the present invention configured as described above has a high fire resistance in the inner crucible, and the outer crucible covered therewith has a large thermal shock resistance. The inner crucible with low impact resistance is reliably protected. Also, since the outer periphery of the nozzle that is integrated with the inner crucible on the bottom of this double crucible is covered with the bottom of the outer crucible through the burned material of alumina and silicon oxide, the nozzle with low thermal shock resistance is surely protected. To be done. Therefore, when the precious metal ingot is melted in the double crucible and the molten metal is continuously dropped into the water from the nozzle at the bottom to form precious metal granular lumps, the nozzle as well as the inner crucible is not damaged. Between the inner crucible and the outer crucible, zirconia powder is filled in the bottom part and asbestos is filled in the upper part, so they act as a heat shield, suppressing the heat release from the inner crucible and cooling the molten metal. Is prevented. Further, although there is a difference in thermal expansion between the inner crucible and the outer crucible, asbestos is filled between the two, so that the thermal expansion can be absorbed and the inner and outer crucibles can be prevented from being deformed.
(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216mm、厚さ8mmのジルコニアより成る内側るつ
ぼ1を、内径78mm、深さ217mm、厚さ8mmのアルミナ92wt
%と酸化珪素8wt%より成る外側るつぼ2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1と
一体の内径4mm、長さ20mm、肉厚1.5mmのノズル4を形成
している。このノズル4の外周と外側るつぼ2の底に設
けたノズル挿通孔5との間隙には、アルミナ92wt%と酸
化珪素8wt%とのスラリー6を充填して焼成し、結合一
体化している。内側るつぼ1の円弧状底部外面と外側る
つぼ2の円弧状底部内面との間隙にはジルコニア粉末7
を充填し、それより上方の内側るつぼ1の外周面と外側
るつぼ2の内周面との間隙には石綿8を充填している。(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.
Inner crucible 1 made of zirconia, m, depth 216 mm, thickness 8 mm, alumina 92 wt, inner diameter 78 mm, depth 217 mm, thickness 8 mm
% And silicon oxide 8 wt% to cover the outer crucible 2 to form a double crucible. At the bottom of this double crucible, a nozzle 4 having an inner diameter of 4 mm, a length of 20 mm and a wall thickness of 1.5 mm is formed integrally with the inner crucible 1. are doing. A slurry 6 of 92 wt% alumina and 8 wt% silicon oxide is filled in the gap between the outer periphery of the nozzle 4 and the nozzle insertion hole 5 provided at the bottom of the outer crucible 2 and the mixture is fired and integrated with each other. Zirconia powder 7 is placed in the gap between the outer surface of the arcuate bottom of the inner crucible 1 and the inner surface of the arcuate bottom of the outer crucible 2.
Is filled, and asbestos 8 is filled in the gap between the outer peripheral surface of the inner crucible 1 and the inner peripheral surface of the outer crucible 2 above it.
かように構成されたPt、Pd系貴金属粒状塊製造用るつ
ぼ9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10にセットし、該装
置10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11を配設した上、るつぼ9内に3kgのPt
インゴットを入れ、高周波誘導装置10を運転して、るつ
ぼ9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11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がアルミナと酸化珪素のスラリーの焼成物を
介して外側るつぼ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
とがない。また内側るつぼ1と外側るつぼ2との間に、
底部ではジルコニア粉末7が充填され、それより上部で
は石綿8が充填されているので、これらが遮熱作用を
し、内側るつぼ1の熱の放出が抑えられ、Pt溶湯が冷め
るのが防止される。さらに内側るつぼ1と外側るつぼ2
とは熱膨張差があるが、両者の間に石綿8が充填されて
いるので、これにより熱膨張が吸収され、内外のるつぼ
1、2の変形が防止される。In order to produce a Pt / Pd-based noble metal granular lump by the crucible 9 for producing a Pt / Pd-based noble metal granular lump configured as described above, the Pt / Pd-based noble metal granular lump is set in the high frequency induction heating device 10 as shown in FIG. 750 mm diameter concentric with nozzle 4 at a distance of 500 mm below
A water tank 11 with a depth of 900 mm is installed, and 3 kg of Pt is placed in the crucible 9.
An ingot is put in, and the high frequency induction device 10 is operated to melt the Pt ingot in the crucible 9. When the Pt ingot is completely melted, the Pt molten metal continuously drops from the bottom nozzle 4 into the water in the water tank 11 to form Pt granular lumps having a diameter of 4 mm or less. 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 oxidized with alumina. Since the bottom portion of the outer crucible 2 is covered with the fired product of the silicon slurry, the inner crucible 1 and the nozzle 4 are reliably protected, and therefore the nozzle 4 as well as the inner crucible 1 is damaged by thermal shock. Never. Also, between the inner crucible 1 and the outer crucible 2,
Since the bottom part is filled with zirconia powder 7 and the upper part is filled with asbestos 8, they act as a heat shield, suppressing the release of heat from the inner crucible 1 and preventing the Pt melt from cooling. . Inside crucible 1 and outside crucible 2
Although there is a difference in thermal expansion between the two, since the asbestos 8 is filled between them, the thermal expansion is absorbed thereby, and the inner and outer crucibles 1 and 2 are prevented from being deformed.
(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、Pt、Pd系貴金属を高周波誘導加熱に
より溶解し、その溶湯をノズルより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
熱衝撃により損傷することがない。またPt、Pd系貴金属
の溶解時及びその溶湯がノズルから流出落下時、内側る
つぼの熱の放出が抑えられので、溶湯が冷めるのが防止
され、ノズルで目詰まりすることがない。さらに内外の
るつぼの熱膨張を両者の間の間隙に充填された石綿によ
り吸収され、るつぼ本体が変形することがない。(Effect of the invention) As can be seen from the above description, the Pt and Pd-based precious metal granular lump manufacturing crucibles of the present invention melt Pt and Pd-based precious metals by high-frequency induction heating, and melt the molten metal continuously from the nozzle. When falling into a water tank to form a granular mass, the crucible body and nozzle are not damaged by thermal shock. Further, when the Pt or Pd-based precious metal is melted or when the molten metal flows out and falls from the nozzle, the heat release from the inner crucible is suppressed, so that the molten metal is prevented from being cooled and the nozzle is not clogged. Furthermore, the thermal expansion of the inner and outer crucibles is absorbed by the asbestos filled in the gap between them, and the crucible body is not deformed.
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、該ノズルの外周と外側るつぼの底のノズル挿
通孔との間隙にアルミナと酸化珪素のスラリーを充填し
て焼成し、内側るつぼの円弧状底部と外側るつぼの円弧
状底部との間隙にジルコニア粉末を充填し、それより上
方の内側るつぼと外側るつぼとの間隙に石綿を充填した
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 outer periphery of the nozzle is formed. And the gap between the nozzle insertion hole at the bottom of the outer crucible and alumina and silicon oxide slurry is filled and fired, the gap between the arc-shaped bottom of the inner crucible and the arc-shaped bottom of the outer crucible is filled with zirconia powder, which A crucible for producing Pt and Pd-based noble metal granular lumps, characterized in that a gap between an inner crucible and an outer crucible above is filled with asbestos.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62302564A JP2526258B2 (en) | 1987-11-30 | 1987-11-30 | Crucible for producing Pt, Pd-based granular noble metal particles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62302564A JP2526258B2 (en) | 1987-11-30 | 1987-11-30 | Crucible for producing Pt, Pd-based granular noble metal particles |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01142386A JPH01142386A (en) | 1989-06-05 |
JP2526258B2 true JP2526258B2 (en) | 1996-08-21 |
Family
ID=17910494
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62302564A Expired - Lifetime JP2526258B2 (en) | 1987-11-30 | 1987-11-30 | Crucible for producing Pt, Pd-based granular noble metal particles |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2526258B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109357526A (en) * | 2018-10-26 | 2019-02-19 | 重庆国际复合材料股份有限公司 | A kind of crucible and its speedy erection system not easy to crack |
-
1987
- 1987-11-30 JP JP62302564A patent/JP2526258B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH01142386A (en) | 1989-06-05 |
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