JPH0470362B2 - - Google Patents
Info
- Publication number
- JPH0470362B2 JPH0470362B2 JP59175348A JP17534884A JPH0470362B2 JP H0470362 B2 JPH0470362 B2 JP H0470362B2 JP 59175348 A JP59175348 A JP 59175348A JP 17534884 A JP17534884 A JP 17534884A JP H0470362 B2 JPH0470362 B2 JP H0470362B2
- Authority
- JP
- Japan
- Prior art keywords
- metal
- crucible
- pellets
- furnace body
- hydrogen gas
- 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
- 239000002184 metal Substances 0.000 claims description 52
- 229910052751 metal Inorganic materials 0.000 claims description 52
- 239000000843 powder Substances 0.000 claims description 33
- 239000008188 pellet Substances 0.000 claims description 28
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 19
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 229910001111 Fine metal Inorganic materials 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 16
- 229910001510 metal chloride Inorganic materials 0.000 claims description 11
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 239000000779 smoke Substances 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000006722 reduction reaction Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 229960002089 ferrous chloride Drugs 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000015654 memory Effects 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000000859 sublimation Methods 0.000 description 1
- 230000008022 sublimation Effects 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は金属の塩化物のペレツトをプラズマ加
熱する金属微粉末の製造装置に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for producing fine metal powder by plasma heating pellets of metal chloride.
近年、金属微粉末は、その金属塊には全く見ら
れないような磁気特性、光学特性、電気特性、化
学反応性及び焼結性等により、大容量の磁気メモ
リー、センサ、太陽熱吸収塗料、超電導材料、高
効率触媒、新焼結体等、その新規利用分野が急展
開している。 In recent years, fine metal powders have been used in large-capacity magnetic memories, sensors, solar heat-absorbing paints, and superconductors due to their magnetic, optical, electrical, chemical reactivity, and sintering properties, which are completely absent from metal lumps. New fields of use are rapidly developing, such as materials, high-efficiency catalysts, and new sintered bodies.
本発明は、かかる新規利用に応える高純度の金
属微粉末を生産性良く製造することができる金属
微粉末の製造装置に関するものである。 The present invention relates to a metal fine powder manufacturing apparatus that can manufacture high-purity metal fine powder with good productivity in response to such new uses.
〈従来の技術とその問題点〉
従来、金属微粉末の製造手段として、化学的手
段と物理的手段が採用されている。前者の化学的
手段は、溶液中での化学反応により沈殿物として
金属微粉末を得たり、或いは金属よりも蒸気圧が
大きく且つ融点の低い金属化合物、例えば金属の
塩化物を、加熱蒸発させて水素で還元し、金属微
粉末を捕集するものであるが、これらの従来手段
によると、得られる金属微粉末の粒径が大きく、
また該金属微粉末が水分や副生成物等で汚染され
ることを避けられないために純度の低いものとな
る問題点がある。また後者の物理的手段は、真空
蒸発法と通称され、金属を低圧の不活性ガス中で
加熱蒸発させて金属微粉末を捕集するもので、現
在一般的に採用されているが、この従来手段によ
ると、粒径が小さく且つ純度の高いものが得られ
る反面、蒸発速度が遅いために生産性が低く、し
たがつて高価なものとなる問題点がある。<Prior art and its problems> Conventionally, chemical means and physical means have been employed as means for producing fine metal powder. The former chemical method involves obtaining a fine metal powder as a precipitate through a chemical reaction in a solution, or heating and vaporizing a metal compound with a higher vapor pressure and lower melting point than the metal, such as a metal chloride. These conventional methods reduce the metal powder with hydrogen and collect it, but with these conventional methods, the particle size of the metal powder obtained is large;
Furthermore, there is a problem that the metal fine powder is inevitably contaminated with moisture, by-products, etc., resulting in low purity. The latter physical method, commonly known as the vacuum evaporation method, involves heating and evaporating metal in a low-pressure inert gas to collect fine metal powder, and is currently commonly used. According to this method, although it is possible to obtain particles with small particle size and high purity, there is a problem that the evaporation rate is slow, resulting in low productivity and therefore high cost.
最近、プラズマ水素ガスの金属に対する反応性
を利用し、金属をプラズマ加熱する金属微粉末の
製造手段（通称、ガス中蒸発法）が提案されてい
る（例えば、雑誌「化学と工業」、第36巻第８号、
72〜74頁、1983年）。これは、水素ガス雰囲気下
に金属をプラズマ加熱し、この際、溶融金属の周
辺部から激しく発生する所謂金属煙を捕集するも
のであるが、この手段でも依然として、得られる
金属微粉末の生産性の点で問題点があり、しかも
加熱に伴つて生じる溶融物の飛散で粒径の大きな
粒が混入する等他の問題点もある。 Recently, a method for producing fine metal powder (commonly known as evaporation in gas method) has been proposed, which utilizes the reactivity of plasma hydrogen gas to metal and heats the metal with plasma. Volume No. 8,
72-74, 1983). This method plasma-heats metal in a hydrogen gas atmosphere and collects the so-called metal smoke that is violently generated from the periphery of the molten metal, but even with this method, it is still difficult to produce the resulting fine metal powder. There are problems in terms of properties, and there are also other problems such as particles with large diameters being mixed in due to the scattering of the melt that occurs during heating.
〈発明が解決しようとする問題点〉
本発明は叙上の如き従来手段の問題点を解決す
るもので、金属の塩化物のペレツトを特定条件下
でプラズマ加熱することを骨子として、高純度の
金属微粉末を生産性良く（具体的には単位時間当
たりの処理量や収率を向上すること）、したがつ
て経済的に製造する金属微粉末の製造装置を提供
するものである。<Problems to be Solved by the Invention> The present invention solves the problems of the conventional methods as described above. It is an object of the present invention to provide a manufacturing apparatus for producing metal fine powder with good productivity (specifically, by improving the processing amount and yield per unit time) and thus economically producing metal fine powder.
〈問題点を解決するための手段〉
しかして本発明者らは、得られる金属微粉末の
粒度、純度及び生産性を平均的に充足する上で従
来手段の中では比較的有効なプラズマ加熱による
金属微粉末の製造手段について鋭意研究した結
果、この従来手段において前記生産性等がなお不
充分であるという問題の所在がプラズマ加熱で発
生させる所謂金属塩（金属蒸気）それ自体の量的
及び質的なところにあり、かかる問題を解決する
には、金属の塩化物のペレツトを処理対象とし
て、これを同種金属の溶湯へ一旦捕捉させつつ水
素ガス存在下にプラズマ加熱することが極めて有
効であることを見出し、本発明を完成するに到つ
た。<Means for Solving the Problems> However, the present inventors have discovered that plasma heating, which is relatively effective among conventional means in achieving an average level of particle size, purity, and productivity of the obtained fine metal powder, has been proposed. As a result of intensive research on the means for producing fine metal powder, we found that the problem with the above-mentioned productivity, etc., being still insufficient with this conventional method lies in the quantity and quality of the so-called metal salt (metal vapor) itself generated by plasma heating. To solve this problem, it is extremely effective to treat metal chloride pellets and heat them with plasma in the presence of hydrogen gas while trapping them in a molten metal of the same kind. This discovery led to the completion of the present invention.
すなわち本発明は、
一端に水素ガス又は水素ガスとアルゴンガスと
を作動ガスとするプラズマトーチが装備され且つ
他端に排気口が開口された略々Ｖ字形の炉体であ
つて、該炉体のほぼ中央底側にルツボが取付けら
れ、該ルツボには金属の溶湯を保持する陥部が形
成されていて、該ルツボに対向する前記炉体の上
側に金属の塩化物のペレツトの供給口が開口され
て成る金属微粉末の製造装置に係る。 That is, the present invention provides a roughly V-shaped furnace body equipped with a plasma torch using hydrogen gas or hydrogen gas and argon gas as working gases at one end and having an exhaust port opened at the other end. A crucible is attached to the bottom of the furnace, and the crucible has a recess for holding molten metal, and a supply port for pellets of metal chloride is provided on the upper side of the furnace body facing the crucible. The present invention relates to an apparatus for manufacturing fine metal powder, which is formed by opening.
以下、図面に基づいて本発明の構成を更に詳細
に説明する。 Hereinafter, the configuration of the present invention will be explained in more detail based on the drawings.
〈実施例〉
第１図は本発明に係る装置の一実施例を示す断
面図（一部省略）、また第２図はその部分拡大図
である。<Embodiment> FIG. 1 is a sectional view (partially omitted) showing an embodiment of the apparatus according to the present invention, and FIG. 2 is a partially enlarged view thereof.
略々Ｖ字形の炉体１が設置されており、この炉
体１は中空に形成されていて、Ｖ字形のその一端
には水素ガス又は水素ガスとアルゴンガスとを作
動ガスとするプラズマトーチ２が装備され、その
他端には排気口３が開口されている。炉体１のほ
ぼ中央底側にはルツボ４が取付けられており、こ
のルツボ４は銅製で水冷されるようになつてい
て、金属の溶湯Ｍを保持することができる陥部５
が形成されている。そして、このルツボ４に対向
するが如く、炉体１の上側には金属の塩化物のペ
レツトＰの供給口６が開口されている。図面の場
合にはまた、供給口６の外側に水素ガス及び／又
はアルゴンガスの流入口７が周設されている。 A roughly V-shaped furnace body 1 is installed, this furnace body 1 is formed hollow, and a plasma torch 2 using hydrogen gas or hydrogen gas and argon gas as working gas is installed at one end of the V-shape. is equipped, and an exhaust port 3 is opened at the other end. A crucible 4 is attached to the bottom of the furnace body 1, which is made of copper and is water-cooled, and has a recess 5 that can hold the molten metal M.
is formed. A supply port 6 for the metal chloride pellets P is opened in the upper side of the furnace body 1 so as to face the crucible 4. In the case of the drawing, an inlet 7 for hydrogen gas and/or argon gas is also provided around the outside of the supply port 6 .
第３図は本発明に使用される他のルツボを例示
する拡大平面図、第４図はそのＡ−Ａ線部分断面
図、第５図は同じくＢ−Ｂ線部分断面図である。
ルツボ８は、外周平面が円形であり、そのほぼ中
央に周囲を傾斜面９，１０，１１，１２で囲まれ
ている二段階の陥部１３，１４が形成されている
もので、主として陥没の程度が大きい方の陥部１
３に金属の溶湯が保持されるようになつている。 FIG. 3 is an enlarged plan view illustrating another crucible used in the present invention, FIG. 4 is a partial cross-sectional view taken along the line A-A, and FIG. 5 is a partial cross-sectional view taken along the line B-B.
The crucible 8 has a circular outer circumferential plane, and two-stage depressions 13 and 14 surrounded by inclined surfaces 9, 10, 11, and 12 are formed at approximately the center of the crucible 8. Larger depression 1
3 holds molten metal.
〈作用〉
第１図及び第２図を引用して、本発明の作用を
説明する。<Operation> The operation of the present invention will be explained with reference to FIGS. 1 and 2.
本発明において、処理対象となるのは、金属の
塩化物を造粒したペレツトである。この種のペレ
ツトは、例えば塩化ニツケル（NiCl2）や塩化第
一鉄（FeCl2）等の粉体を既によく知られている
造粒機に供して、容易に得ることができる。使用
する金属の塩化物は、結晶水を含むものでも（例
えばNiCl2・6H2Ｏ）、又は所謂無水物でもよい
が、これらの粉体から造粒したペレツトは、以後
の処理の安定化等の点で、乾燥したものを対象と
するのが好ましい。 In the present invention, the object to be treated is pellets made by granulating metal chlorides. Pellets of this type can be easily obtained, for example, by subjecting a powder of nickel chloride (NiCl 2 ), ferrous chloride (FeCl 2 ), or the like to a well-known granulator. The metal chloride used may contain water of crystallization (for example, NiCl 2 .6H 2 O) or may be a so-called anhydride, but pellets granulated from these powders can be used to stabilize subsequent processing, etc. From this point of view, it is preferable to use dry products.
前記ペレツトＰを供給口６から炉体１の内部へ
自重落下により供給する。この場合の供給は、本
発明の性質上、水素ガス及び／又はアルゴンガス
の雰囲気中で行うのが好ましい。そして、供給方
向はルツボ４の陥部５である。この陥部５には予
め処理対象であるペレツトＰと同種金属の溶湯Ｍ
を作製しておき、以後処理中はかかる溶湯Ｍを保
持する。溶湯Ｍの作製及び保持は、前述したよう
な特殊形状のルツボ５による溶湯Ｍの保持効果の
もとに、水素ガス又は水素ガスとアルゴンガスと
を作動ガスとするプラズマトーチ２からのプラズ
マアーク（プラズマジエツト）の噴射によつてな
される。したがつて、供給口６から供給されたペ
レツトＰは一旦溶湯Ｍに捕捉される。捕捉された
ペレツトＰは、前記プラズマアークで高温加熱さ
れている溶湯Ｍによつて、炉体１における水素ガ
ス存在下に、全体を加熱され、直ちに還元され
て、所謂金属煙（金属蒸気）Ｖとなる。この金属
煙Ｖは前記プラズマアークの噴射流に乗るが如く
排気口３から搬出される。搬出された金属煙Ｖは
以下、常法にしたがつて気相で凝縮させてもよい
が、金属煙Ｖを高温のままで急冷水捕集し、これ
によつて生成する懸濁液を固液分離して、分離し
た固形分を水素ガス気流中にて例えば300℃程度
で間接加熱し、還元精製するのが好ましい。 The pellets P are fed into the furnace body 1 from the feed port 6 by falling under their own weight. In view of the nature of the present invention, the supply in this case is preferably carried out in an atmosphere of hydrogen gas and/or argon gas. The supply direction is the recess 5 of the crucible 4. In this recess 5, a molten metal M of the same kind of metal as the pellet P to be treated is placed in advance.
is prepared in advance, and the molten metal M is held during subsequent processing. The production and retention of the molten metal M is carried out using a plasma arc ( This is done by ejecting a plasma jet. Therefore, the pellets P supplied from the supply port 6 are once captured by the molten metal M. The captured pellets P are heated as a whole in the presence of hydrogen gas in the furnace body 1 by the molten metal M heated at high temperature by the plasma arc, and are immediately reduced to produce so-called metal smoke (metal vapor) V. becomes. This metal smoke V is carried out from the exhaust port 3 as if riding on the jet flow of the plasma arc. The metal smoke V carried out may be condensed in the gas phase according to a conventional method, but the metal smoke V is collected with quenching water while still at a high temperature, and the resulting suspension is solidified. It is preferable to perform liquid separation and to indirectly heat the separated solid content at, for example, about 300° C. in a hydrogen gas stream for reductive purification.
本発明では、金属の塩化物を造粒したペレツト
Ｐを処理対象とする。したがつて、それを構成す
る金属より蒸気圧が高くしかも金属の塩化物自体
は昇華により直接気化するため、該ペレツトＰは
急速に蒸発し、またその処理物が融滴となつて飛
散するようなことがない。加えて、還元反応が気
化した気体分子や電離イオンの形で行われるため
に還元によつて生成した金属微粉末の粒径は極め
て小さい。また金属の塩化物を粉体のままで供給
口６から炉体１の内部へ供給すると、ペレツトＰ
に比べて供給速度が大きくとれない上に前記プラ
ズマアークの噴射に吹き飛ばされて、未反応のま
ま該粉体が排気口３から搬出される不都合があ
る。したがつて必然に、粉体のままで供給する場
合には、その供給量を抑制することとなるが、そ
れでもなお、前記不都合を避け難い。この結果、
前述したような生産性及び純度がともに低くな
る。本発明においてペレツトＰを対象とするの
は、それが自重落下で連続的に供給されるためそ
の供給が容易というだけでなく、前記不都合を排
除して前述したような生産性及び純度を向上させ
ることができるからである。 In the present invention, pellets P, which are granulated metal chlorides, are treated. Therefore, the vapor pressure is higher than that of the metal composing it, and the metal chloride itself vaporizes directly by sublimation, so the pellet P evaporates rapidly and the processed material becomes molten droplets and scatters. Never happened. In addition, since the reduction reaction is carried out in the form of vaporized gas molecules or ionized ions, the particle size of the fine metal powder produced by reduction is extremely small. Furthermore, if metal chloride is fed into the furnace body 1 from the supply port 6 in powder form, pellets P
In addition, there is a disadvantage that the supply speed cannot be as high as compared to the above, and the powder is blown away by the plasma arc jet and carried out from the exhaust port 3 without reacting. Therefore, if the powder is supplied in the form of powder, the amount of the powder to be supplied must be suppressed, but the above-mentioned disadvantages are still difficult to avoid. As a result,
Both productivity and purity as described above are lowered. The purpose of the present invention is to use pellets P not only because it is easy to feed since it is continuously fed by falling under its own weight, but also because it eliminates the above-mentioned disadvantages and improves productivity and purity as described above. This is because it is possible.
また本発明では、ペレツトＰを同種金属の溶湯
Ｍで一旦捕捉する。プラズマトーチ２からのプラ
ズマアークで高温加熱されている溶湯Ｍによつ
て、ペレツトＰの全体が効率よく且つ均一に加熱
され、したがつて迅速且つ完全にペレツトＰが還
元反応を受けるからであり、併せて溶湯Ｍがペレ
ツトＰを捕捉することそれ自体によつても前記不
都合を排除できるからである。このような役割の
溶湯Ｍは、処理中において常時、ペレツトＰの捕
捉及びプラズマアークによる加熱という双方との
関係で、ほぼ固定的に保持される必要がある。ル
ツボ４に陥部５を形成しているのは、この陥部５
がかかる必要を満たすからである。 Further, in the present invention, the pellets P are once captured by the molten metal M of the same kind of metal. This is because the entire pellet P is efficiently and uniformly heated by the molten metal M heated to a high temperature by the plasma arc from the plasma torch 2, so that the pellet P undergoes a reduction reaction quickly and completely. This is because the above-mentioned disadvantages can also be eliminated by the fact that the molten metal M captures the pellets P itself. The molten metal M, which plays such a role, needs to be held almost fixedly at all times during the treatment, both for trapping the pellets P and for heating by the plasma arc. This recess 5 forms the recess 5 in the crucible 4.
This is because it satisfies this need.
第３図〜第５図に例示したようなルツボ８を代
用すると、ペレツトＰの供給方向が若干ズレて
も、傾斜面９〜１２によつて結局、陥部１３に保
持されてプラズマアークで直接加熱される最も温
度の高くなつた溶湯に捕捉されることとなるた
め、該ルツボ８に限定されるものではないが、陥
部がその周囲を傾斜面で囲まれている形状のルツ
ボが好ましい。第１図において、流入口７から水
素ガス及び／又はアルゴンガスを流入すると、該
ガスがペレツトＰを溶湯Ｍへ供給するその該当雰
囲気Ｃをシールする。その結果、ペレツトＰの供
給方向のズレを抑制できるだけでなく、該当雰囲
気Ｃの内部を相対的に高濃度の水素ガス雰囲気と
することもできるため、ペレツトＰの還元反応を
それだけ促進できる。この際、ルツボ４を水冷銅
製のものとすれば、ルツボ４が消耗しないので、
一層高純度の金属微粉末が得られる。 If the crucible 8 as illustrated in FIGS. 3 to 5 is used instead, even if the feeding direction of the pellet P is slightly deviated, it will eventually be held in the recess 13 by the inclined surfaces 9 to 12 and will be directly exposed to the plasma arc. Since the molten metal is captured by the heated molten metal, it is not limited to the crucible 8, but a crucible having a recess surrounded by an inclined surface is preferable. In FIG. 1, when hydrogen gas and/or argon gas is introduced from the inlet 7, the gas seals the corresponding atmosphere C that supplies the pellets P to the molten metal M. As a result, not only can deviation in the supply direction of the pellets P be suppressed, but also the inside of the atmosphere C can be made into a hydrogen gas atmosphere with a relatively high concentration, so that the reduction reaction of the pellets P can be promoted accordingly. At this time, if the crucible 4 is made of water-cooled copper, the crucible 4 will not be consumed.
Fine metal powder with even higher purity can be obtained.
更に本発明では、略々Ｖ字形の炉体１が好適に
使用される。プラズマアークの噴射流に対する抵
抗を少なくし、該噴射流に乗せて還元生成した金
属煙Ｖを排気口３から搬出させるためであり、同
時にその一方で、金属煙Ｖに比べれば著るしく重
い、ペレツトＰの未反応破片や炉体１等に起因す
る種々の不純物が、排気口３から搬出されないよ
うにするためである。 Further, in the present invention, a substantially V-shaped furnace body 1 is preferably used. This is to reduce the resistance to the jet stream of the plasma arc and carry out the metal smoke V generated by reduction on the jet stream from the exhaust port 3, and at the same time, it is significantly heavier than the metal smoke V. This is to prevent unreacted fragments of the pellets P and various impurities originating from the furnace body 1 and the like from being carried out through the exhaust port 3.
第１図及び第２図に例示した装置を使用して、
次の条件で処理した。 Using the apparatus illustrated in FIGS. 1 and 2,
It was treated under the following conditions.
ペレツト：無水塩化ニツケル（純度99.4重量
％）を直径16mm×厚さ10mmの円板状に造粒し
たもの
ペレツトの連続供給：167g／分×20分
プラズマトーチ：出力84KW
作動ガス：水素ガス30N／分＋アルゴンガス
35N／分
ルツボ：水冷銅製のもの
炉体の排気口より搬出される金属煙を高温のま
まで急冷水捕集し（水タンクを３個直列に並び、
排気口から排出される金属煙を順次水中へ通し
た）、この際得られる懸濁液を固液分離（濾過）
して、分離した固形分を水素ガス気流中で加熱し
た（300℃，２時間／固形分100g）。回収した金
属微粉末を分析した結果、試験回数20回の総合
で、前記金属煙の発生速度は68.1g／分、金属微
粉末の収率90重量％以上、純度98重量％以上、酸
素含有率1.0重量％以下、塩素含有率0.01重量％
以下であつた。 Pellet: Anhydrous nickel chloride (purity 99.4% by weight) granulated into a disk shape of 16 mm diameter x 10 mm thickness Continuous supply of pellets: 167 g/min x 20 minutes Plasma torch: Output 84 KW Working gas: Hydrogen gas 30 N/min min + argon gas
35N/min Crucible: Made of water-cooled copper The metal smoke carried out from the exhaust port of the furnace body is collected with quenched water while still at high temperature (three water tanks are arranged in series,
The metal smoke discharged from the exhaust port was passed sequentially into water), and the resulting suspension was separated into solid-liquid (filtration).
The separated solid content was heated in a hydrogen gas stream (300°C, 2 hours/100 g of solid content). As a result of analyzing the recovered metal fine powder, the rate of generation of metal smoke was 68.1 g/min in a total of 20 tests, the yield of metal fine powder was 90% by weight or more, the purity was 98% by weight or more, and the oxygen content was 1.0% by weight or less, chlorine content 0.01% by weight
It was below.
〈発明の効果〉
以上説明した通りであるから、本発明による
と、結果的に高純度の極めて細かい金属微粉末を
生産性良く製造することができ、急展開している
金属微粉末の新規利用に対して質的及び量的に充
分適応することができる効果がある。<Effects of the Invention> As explained above, according to the present invention, extremely fine metal powder of high purity can be produced with good productivity, and new uses of metal fine powder are being rapidly developed. It has the effect of being able to fully adapt to the situation both qualitatively and quantitatively.
第１図は本発明の一実施例を示す断面図（一部
省略）、第２図はその部分拡大図、第３図は本発
明に使用されるルツボを例示する拡大平面図、第
４図は第３図のＡ−Ａ線部分断面図、第５図は同
じくＢ−Ｂ線部分断面図である。
１……炉体、２……プラズマトーチ、３……排
気口、４，８……ルツボ、５，１３，１４……陥
部、６……供給口、７……流入口、９，１０，１
１，１２……傾斜面、Ｐ……ペレツト、Ｍ……溶
湯、Ｖ……金属煙。
FIG. 1 is a sectional view (partially omitted) showing an embodiment of the present invention, FIG. 2 is a partially enlarged view thereof, FIG. 3 is an enlarged plan view illustrating a crucible used in the present invention, and FIG. 4 3 is a partial sectional view taken along the line AA in FIG. 3, and FIG. 5 is a partial sectional view taken along the line BB in FIG. 1... Furnace body, 2... Plasma torch, 3... Exhaust port, 4, 8... Crucible, 5, 13, 14... Recess, 6... Supply port, 7... Inflow port, 9, 10 ,1
1, 12... Slope, P... Pellet, M... Molten metal, V... Metal smoke.
Claims (1)
とを作動ガスとするプラズマトーチが装備され且
つ他端に排気口が開口された略々Ｖ字形の炉体で
あつて、該炉体のほぼ中央底側にルツボが取付け
られ、該ルツボには金属の溶湯を保持する陥部が
形成されていて、該ルツボに対向する前記炉体の
上側に金属の塩化物のペレツトの供給口が開口さ
れて成る金属微粉末の製造装置。 ２ 供給口の外側に水素ガス及び／又はアルゴン
ガスの流入口が周設された特許請求の範囲第１項
記載の金属微粉末の製造装置。 ３ ルツボが水冷銅製のものである特許請求の範
囲第１項又は第２項記載の金属微粉末の製造装
置。[Scope of Claims] 1 A roughly V-shaped furnace body equipped with a plasma torch using hydrogen gas or hydrogen gas and argon gas as working gases at one end and with an exhaust port opened at the other end; A crucible is attached to the bottom side of the furnace body at approximately the center thereof, and a recessed portion for holding molten metal is formed in the crucible, and pellets of metal chloride are supplied to the upper side of the furnace body opposite to the crucible. A device for manufacturing fine metal powder with an open mouth. 2. The apparatus for producing fine metal powder according to claim 1, wherein an inlet for hydrogen gas and/or argon gas is provided around the outside of the supply port. 3. The apparatus for producing fine metal powder according to claim 1 or 2, wherein the crucible is made of water-cooled copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17534884A JPS6152307A (en) | 1984-08-22 | 1984-08-22 | Method and device for producing pulverous metallic powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17534884A JPS6152307A (en) | 1984-08-22 | 1984-08-22 | Method and device for producing pulverous metallic powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6152307A JPS6152307A (en) | 1986-03-15 |
| JPH0470362B2 true JPH0470362B2 (en) | 1992-11-10 |
Family
ID=15994495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17534884A Granted JPS6152307A (en) | 1984-08-22 | 1984-08-22 | Method and device for producing pulverous metallic powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6152307A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4305792B2 (en) * | 1999-03-25 | 2009-07-29 | ソニー株式会社 | Metal refining method and refining method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58110626A (en) * | 1981-12-23 | 1983-07-01 | ウエスチングハウス エレクトリック コ−ポレ−ション | Reduction of metal from chloride salt |
| JPS58174509A (en) * | 1982-04-02 | 1983-10-13 | Nippon Soda Co Ltd | Preparation of spicular ferromagnetic iron powder |
-
1984
- 1984-08-22 JP JP17534884A patent/JPS6152307A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58110626A (en) * | 1981-12-23 | 1983-07-01 | ウエスチングハウス エレクトリック コ−ポレ−ション | Reduction of metal from chloride salt |
| JPS58174509A (en) * | 1982-04-02 | 1983-10-13 | Nippon Soda Co Ltd | Preparation of spicular ferromagnetic iron powder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6152307A (en) | 1986-03-15 |
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