JPH0692601B2 - Method for producing iron-based spherical particles - Google Patents
Method for producing iron-based spherical particlesInfo
- Publication number
- JPH0692601B2 JPH0692601B2 JP63085389A JP8538988A JPH0692601B2 JP H0692601 B2 JPH0692601 B2 JP H0692601B2 JP 63085389 A JP63085389 A JP 63085389A JP 8538988 A JP8538988 A JP 8538988A JP H0692601 B2 JPH0692601 B2 JP H0692601B2
- Authority
- JP
- Japan
- Prior art keywords
- iron
- gas
- oxygen
- powder
- mixture
- 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 - Fee Related
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 83
- 229910052742 iron Inorganic materials 0.000 title claims description 32
- 239000012798 spherical particle Substances 0.000 title claims description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000000843 powder Substances 0.000 claims description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 19
- 239000001301 oxygen Substances 0.000 claims description 19
- 229910052760 oxygen Inorganic materials 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 18
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 239000011261 inert gas Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims 6
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 20
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 18
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 229910001873 dinitrogen Inorganic materials 0.000 description 8
- 239000001294 propane Substances 0.000 description 8
- 239000000446 fuel Substances 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- ATRMIFNAYHCLJR-UHFFFAOYSA-N [O].CCC Chemical compound [O].CCC ATRMIFNAYHCLJR-UHFFFAOYSA-N 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 3
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 3
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- LNSPFAOULBTYBI-UHFFFAOYSA-N [O].C#C Chemical group [O].C#C LNSPFAOULBTYBI-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- -1 powder metallurgy Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、鉄系球状粒子の製造方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a method for producing iron-based spherical particles.
［従来の技術］ 鋼材の溶断、粉末冶金、化学還元などにおいて使用され
る鉄系の粉末は、鉄系素材を粉砕し篩分する方法によっ
ていたが、粉末の流動性や製品品質の向上を狙うため、
粉砕粉に代わって、球状の粉末が要求されてきている。
鉄系の球状粒子の製造方法は、特開昭50-146561に記載
されるように、1000〜1400℃の雰囲気に鉄粉を投入し、
鉄粉を酸化燃焼させその熱によって、鉄粉を溶融し、球
状化することが知られている。しかしながら、この方法
では、投入する鉄粉末が過度に酸化するため、球状化し
た鉄粉の周囲に酸化鉄層が生成する欠点を有している。[Prior Art] Iron-based powders used in melting of steel, powder metallurgy, chemical reduction, etc. have been manufactured by crushing and sieving iron-based materials, but aim to improve the fluidity of powder and product quality. For,
Spherical powder has been demanded instead of crushed powder.
The method for producing iron-based spherical particles, as described in JP-A-50-146561, put iron powder into an atmosphere of 1000 to 1400 ° C.,
It is known that iron powder is oxidatively burned and the heat thereof is used to melt the iron powder and make it spherical. However, this method has a drawback that an iron oxide layer is formed around the spheroidized iron powder because the iron powder to be charged is excessively oxidized.
［発明が解決しようとする課題と解決手段］ 上記の公知技術では、鉄系球状粒子の製造は、可能であ
るが粒子の周辺に、酸化鉄が生成するため、その酸化鉄
を還元して金属鉄とする工程を必要とする。[Problems to be Solved by the Invention and Means for Solving the Problems] In the above-mentioned known technique, although iron-based spherical particles can be produced, iron oxide is generated around the particles. Requires a process to make iron.
発明者等は、このような上記従来技術の欠点を解消する
ため、火炎中に破砕状または、繊維状の鉄系粉末を不活
性ガスと共に投入し、火炎中で球状化させる方法を見出
した。すなわち、公知例では、鉄粉末自体を酸素によっ
て酸化燃焼させるため、当然のことながら、粒子の周囲
に酸化鉄層を生成する。これに対し、本発明法では、鉄
系粉末を溶融させる熱源は、酸素、空気、プロパン、ア
セチレンなど気体燃料によっているため、鉄粉の過剰な
酸化がおこり難い。さらに、本発明では、鉄粉末を不活
性ガスと一緒に火炎中に投入するため、酸化鉄の生成
を、さらに防止することが可能である。In order to overcome the above-mentioned drawbacks of the prior art, the inventors have found a method of introducing crushed or fibrous iron-based powder into a flame together with an inert gas and spheroidizing in the flame. That is, in the known example, since the iron powder itself is oxidatively burned by oxygen, an iron oxide layer is naturally formed around the particles. On the other hand, in the method of the present invention, since the heat source for melting the iron-based powder is gaseous fuel such as oxygen, air, propane, and acetylene, excessive oxidation of the iron powder is unlikely to occur. Further, in the present invention, the iron powder is charged into the flame together with the inert gas, so it is possible to further prevent the generation of iron oxide.
この方法によれば、鉄系粉末を溶融させるための熱源
は、気体燃料を使用するため、公知例のような鉄粉末の
燃焼による酸化鉄層を生成することはない。しかも、酸
素−プロパンや酸素−アセチレン噴出孔と鉄系粉末噴出
孔とが独立し、鉄系粉末は、専用の噴出孔から不活性ガ
スと一緒に噴出するため、その粉末の溶融に際し、酸化
現象が一層起こりにくい。このような本発明法によれ
ば、鉄系粉末が火炎中で溶融し、表面張力によって完全
に球状化し、冷却過程で鉄系の球状粒子が得られること
になる。According to this method, since the heat source for melting the iron-based powder uses the gaseous fuel, the iron oxide layer due to the combustion of the iron powder as in the known example is not generated. Moreover, the oxygen-propane or oxygen-acetylene ejection holes and the iron-based powder ejection holes are independent, and the iron-based powder is ejected together with the inert gas from the dedicated ejection hole, so that when the powder is melted, an oxidation phenomenon occurs. Is even less likely to occur. According to such a method of the present invention, the iron-based powder is melted in the flame and completely spherical due to the surface tension, and iron-based spherical particles are obtained in the cooling process.
次に、本発明法を図面に基づいて詳細に説明する。Next, the method of the present invention will be described in detail with reference to the drawings.
第１図は、本発明法による鉄系球状粒子の製造方法の概
略図である。バーナ１の正面は、第２図に示すように火
炎孔10と鉄系粉末噴出孔11がサンドウィチ状に円周状に
配列されている。バーナ１からは、例えば、酸素−プロ
パン火炎２と鉄系粉末３が噴出する。鉄系粉末３は、ホ
ッパー５に貯蔵されており、窒素ガス９とともにパイプ
（又はホース）４を通じてバーナに入り、噴出する。一
方、火炎を生成する酸素６、プロパン（又はアセチレ
ン）７が、ガス制御器８を経由してバーナ１に入り、酸
素−プロパンの混合気体となり、火炎孔10より噴出し、
火炎を生成する。形成した火炎２の熱により窒素ガスと
ともに噴出した鉄系粉末３が溶融し、表面張力によって
球状化する。冷却凝固後、鉄系粉末を回収することによ
って大量の球状化鉄粉を得ることができる。FIG. 1 is a schematic view of a method for producing iron-based spherical particles according to the method of the present invention. On the front surface of the burner 1, flame holes 10 and iron-based powder ejection holes 11 are circumferentially arranged in a sandwich shape as shown in FIG. From the burner 1, for example, oxygen-propane flame 2 and iron-based powder 3 are ejected. The iron-based powder 3 is stored in the hopper 5, enters the burner through the pipe (or hose) 4 together with the nitrogen gas 9, and is ejected. On the other hand, oxygen 6 and propane (or acetylene) 7 that generate a flame enter the burner 1 via the gas controller 8 and become a mixed gas of oxygen-propane, which is ejected from the flame hole 10.
Generates a flame. The heat of the formed flame 2 melts the iron-based powder 3 ejected together with the nitrogen gas, and the iron-based powder 3 is spheroidized by the surface tension. A large amount of spheroidized iron powder can be obtained by collecting the iron-based powder after cooling and solidification.
このプロセスにおいて、鉄系粉末は、窒素ガスとともに
噴出し、鉄粉の酸化防止が図れるが、望ましくは、燃料
である酸素−プロパンの燃焼比率を（理論的には、酸素
／プロパン＝５）を小さくし、出来るだけ、過剰酸素を
少なくすることが酸化防止をさらに高める上で重要であ
る。In this process, the iron-based powder is ejected together with the nitrogen gas to prevent oxidation of the iron powder, but it is desirable to set the combustion ratio of oxygen-propane, which is the fuel (theoretical, oxygen / propane = 5). It is important to reduce the amount of excess oxygen as much as possible in order to further improve the oxidation prevention.
［実施例］ 実施例１ 鋼材の溶断用として使用している粉砕鉄粉を従来法、す
なわち、鉄粉を酸素によって酸化燃焼させる技術と比較
して調査した。本発明法では、燃料に酸素とプロパン
を、鉄粉のキャリヤーガスに窒素ガスを使用し、鉄粉の
火炎への供給速度を80kg/hrとした。その結果を第１表
に示した。[Examples] Example 1 The pulverized iron powder used for melting and cutting steel materials was investigated by comparison with a conventional method, that is, a technique of oxidizing and burning iron powder with oxygen. In the method of the present invention, oxygen and propane were used as the fuel, and nitrogen gas was used as the carrier gas for the iron powder, and the supply rate of the iron powder to the flame was 80 kg / hr. The results are shown in Table 1.
ここで、本発明法のプロパン量と酸素量は、プロパン15
Nm3/hr一定とし、酸素の量を75、60、45Nm3/hrと変化さ
せ、酸素／プロパン比が５、４、３となるようにした。
また、キャリヤーガスとしての窒素は、7Nm3/hrの一定
として実施した。第１表から明らかなように、従来法で
は、鉄粉末自体は、球状化するが、その表面に30〜40％
の酸化鉄が発生する。これに対し、本発明法では、酸素
／プロパン比が５の時、３〜４％の酸化鉄が発生するの
みで、その比が４、３の時は、全く発生しない。これ
は、本発明法では、溶融した球状粒子が酸素と反応しに
くいことを示しており、従来法の鉄粉末を酸素によって
酸化燃焼させる技術とは、各段に差が認められる。 Here, the amount of propane and the amount of oxygen in the method of the present invention are
The oxygen amount was changed to 75, 60 and 45 Nm 3 / hr while keeping the Nm 3 / hr constant and the oxygen / propane ratio was set to 5, 4, and 3 .
Nitrogen as a carrier gas was kept constant at 7 Nm 3 / hr. As is clear from Table 1, in the conventional method, the iron powder itself is spheroidized, but the surface is 30-40%
Iron oxide is generated. On the other hand, in the method of the present invention, when the oxygen / propane ratio is 5, only 3 to 4% of iron oxide is generated, and when the ratio is 4, 3 it is not generated at all. This indicates that the molten spherical particles are unlikely to react with oxygen in the method of the present invention, and there is a difference in each step from the conventional method of oxidizing and burning iron powder with oxygen.
実施例２ ステンレス鋼板の研磨工程で発生する削り粉を脱脂後、
粉砕し、流動性を高めてから、実施例１と同様のテスト
を行なった。テスト条件は、実施例１と同一であるが、
今回は、実施例１に、さらに、火炎全体を窒素ガス雰囲
気で覆って実施した。比較としては、実施例１の火炎を
窒素ガスで覆わない方法と比較した。第２表にその結果
を示す。Example 2 After degreasing the shavings generated in the polishing process of a stainless steel plate,
The same test as in Example 1 was conducted after crushing to improve the fluidity. The test conditions are the same as in Example 1, but
This time, in addition to Example 1, the entire flame was covered with a nitrogen gas atmosphere. For comparison, the flame of Example 1 was compared with the method of not covering with nitrogen gas. The results are shown in Table 2.
窒素雰囲気の条件としては、火炎全体を円筒状の耐火物
で覆い、その円筒物の内部に窒素ガスを、1Nm3/hr吹込
ながら実施した。 The conditions of the nitrogen atmosphere were such that the entire flame was covered with a cylindrical refractory, and nitrogen gas was blown into the inside of the cylinder while blowing 1 Nm 3 / hr.
第２表より明らかなように、窒素雰囲気下でのテストに
よって得たステンレスの球状粉は、酸化率が１％以下と
少ない。このことから、火炎を窒素雰囲気で覆うこと
で、さらに、酸化鉄の少ない球状粉が得られることが判
る。As is clear from Table 2, the stainless spherical powder obtained by the test in the nitrogen atmosphere has a small oxidation rate of 1% or less. From this, it can be seen that by covering the flame with a nitrogen atmosphere, spherical powder containing less iron oxide can be obtained.
［発明の効果］ 実施例１、２で述べたように、本発明法によれば、鉄粉
およびステンレス粉が、容易に球状化でき、しかも、従
来技術で発生したような、酸化鉄の発生率が極めて少な
い球状粒子を得ることができる。本発明法で、使用でき
る材料粉末は、鉄粉、ステンレス粉に限らず、高温で酸
化されやすい鉄系の粉末であれば、あらゆる合金粉末も
使用することができる。[Effects of the Invention] As described in Examples 1 and 2, according to the method of the present invention, the iron powder and the stainless powder can be easily spheroidized, and further, the generation of iron oxide as generated by the conventional technique is generated. It is possible to obtain spherical particles having an extremely low rate. The material powder that can be used in the method of the present invention is not limited to iron powder and stainless powder, and any alloy powder can be used as long as it is an iron-based powder that is easily oxidized at high temperature.
さらに、燃料は、支燃用として、酸素以外に、酸素と窒
素の混合物でも十分使用することができる。一方、燃料
ガスとしては、プロパン、アセチレン等炭化水素系のガ
スや水素、一酸化炭素等の気体燃料であれば、それら
を、単独又は混合して使用することができる。Further, as the fuel, in addition to oxygen, a mixture of oxygen and nitrogen can be sufficiently used for combustion support. On the other hand, as the fuel gas, if it is a hydrocarbon-based gas such as propane or acetylene or a gaseous fuel such as hydrogen or carbon monoxide, these can be used alone or in combination.
第１図は本発明法による鉄系球状粒子の製造方法の一実
施例を示す概略説明図、第２図は第１図におけるバーナ
の正面説明図である。 １……バーナ、２……火炎、３……鉄系粉末、4,6,7…
…パイプ、５……ホッパー、８……ガス制御回路、９…
…窒素ガス、10……火炎孔、11……粉末噴射孔。FIG. 1 is a schematic explanatory view showing an embodiment of the method for producing iron-based spherical particles according to the method of the present invention, and FIG. 2 is a front explanatory view of the burner in FIG. 1 ... Burner, 2 ... Flame, 3 ... Iron-based powder, 4, 6, 7 ...
… Pipes, 5… Hoppers, 8… Gas control circuits, 9…
… Nitrogen gas, 10 …… Flame hole, 11 …… Powder injection hole.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 福岡 弘美 福岡県北九州市八幡東区枝光１―１―１ 新日本製鐵株式会社設備技術本部内 (56)参考文献 特開 昭50−22757（ＪＰ，Ａ) 特開 昭63−307203（ＪＰ，Ａ) 特開 昭63−111101（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromi Fukuoka 1-1-1 Edami, Hachimanto-ku, Kitakyushu City, Fukuoka Prefecture Nippon Steel Co., Ltd. Equipment Engineering Headquarters (56) Reference JP-A-50-22757 (JP) , A) JP-A-63-307203 (JP, A) JP-A-63-111101 (JP, A)
Claims (2)
しくは酸素含有ガスの混合気噴出孔と、該混合気噴出孔
列と同心的かつ半径方向において前記混合気噴出孔列に
挟まれる如く周方向に配列される、鉄系金属材料粉末と
不活性ガスの混合物噴出孔を有するバーナを用いて、可
燃性ガスの燃焼炎を形成し、該燃焼炎中に不活性ガスと
ともに前記鉄系金属材料粉末を投入し、前記可燃性ガス
の燃焼炎中で鉄系金属材料粉末を溶融し球状化するよう
にしたことを特徴とする鉄系球状粒子の製造方法。1. A mixture gas ejection hole of flammable gas and oxygen or an oxygen-containing gas, which is arranged in the circumferential direction, and is sandwiched between the mixture gas ejection hole row concentrically with the mixture gas ejection hole row and in the radial direction. A burner having a mixture of iron-based metal material powder and an inert gas, which is arranged in the circumferential direction as described above, is used to form a combustion flame of a combustible gas, and the iron-based material is mixed with the inert gas in the combustion flame. A method for producing iron-based spherical particles, characterized in that a metal-material powder is charged and the iron-based metal material powder is melted and spheroidized in a combustion flame of the flammable gas.
しくは酸素含有ガスの混合気噴出孔と、該混合気噴出孔
列と同心的かつ半径方向において前記混合気噴出孔列に
挟まれる如く周方向に配列される、鉄系金属材料粉末と
不活性ガスの混合物噴出孔を有するバーナおよびバーナ
からの可燃性ガスの燃焼炎を囲繞する円筒を設けた装置
により可燃性ガスの燃焼炎を形成するとともに、不活性
ガスを送給して前記燃焼炎を不活性ガスで包囲した状態
下に前記燃焼炎中に不活性ガスとともに前記鉄系金属材
料粉末を投入し、前記可燃性ガスの燃焼炎中で鉄系金属
材料粉末を溶融し球状化するようにしたことを特徴とす
る鉄系球状粒子の製造方法。2. A mixture gas ejection hole of a flammable gas and oxygen or an oxygen-containing gas, which is arranged in the circumferential direction, and is concentrically and radially sandwiched by the mixture gas ejection hole row concentric with the mixture air ejection hole row. A burner having a mixture of iron-based metal material powder and an inert gas and a device provided with a cylinder surrounding the combustion flame of the combustible gas from the burner, which are arranged in the circumferential direction as described above, generate a combustion flame of the combustible gas. Along with the formation, the inert gas is fed to feed the ferrous metal material powder together with the inert gas into the combustion flame under the condition that the combustion flame is surrounded by the inert gas, and the combustible gas is burned. A method for producing iron-based spherical particles, characterized in that the iron-based metal material powder is melted in a flame to be spheroidized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63085389A JPH0692601B2 (en) | 1988-04-08 | 1988-04-08 | Method for producing iron-based spherical particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63085389A JPH0692601B2 (en) | 1988-04-08 | 1988-04-08 | Method for producing iron-based spherical particles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01259101A JPH01259101A (en) | 1989-10-16 |
| JPH0692601B2 true JPH0692601B2 (en) | 1994-11-16 |
Family
ID=13857394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63085389A Expired - Fee Related JPH0692601B2 (en) | 1988-04-08 | 1988-04-08 | Method for producing iron-based spherical particles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0692601B2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5022757A (en) * | 1973-07-03 | 1975-03-11 | ||
| JPS63111101A (en) * | 1986-10-30 | 1988-05-16 | Daido Steel Co Ltd | Spheroidizing method for metal or alloy powder |
| EP0292798A3 (en) * | 1987-05-27 | 1989-08-30 | Gte Products Corporation | Hydrometallurgical process for producing finely divided spherical metal powders |
-
1988
- 1988-04-08 JP JP63085389A patent/JPH0692601B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01259101A (en) | 1989-10-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |