Sumitomo Metal Mining Company, Ltd.

Sumitomo Special Metals Co., Ltd.

Yasuhiro Okajima

Yasuhiro Tsugita

Yuji Kaneko

Katsumi Okayama

Shuji Okada

Atsushi Hamamura

Toshio Morimoto

Shinobu Endo

Kaname Takeya

Keizo Kazama

Tamaki Takechi

Syuji Okada

A powder for producing permanent magnets, comprising a blend of powders [A] and [B] or [C] wherein:

Powder material for rare earth-iron-boron based permanent magnets

An alloy target for making a magneto-optical recording medium by sputtering comprises an alloy containing 10 to 50 atom % of at least one rare earth element selected from among Sm, Nd, Gd, Tb, Dy, Ho, Tm and Er, with a balance consisting substantially of at least one transition metal selected from among Co, Fe and Ni. The alloy has a mixed structure composed of at least three phases of intermetallic compounds formed by the rare earth element and the transition metal.

Alloy target for manufacturing a magneto-optical recording medium

An alloy metal powder which contains rare earth metals and which has a uniform composition and contains a minimum of residual reducing agent and oxygen is produced by (1) preparing a mixture composed of (a) a powder of rare earth metal oxide, (b) a powder of a metal which is difficult to volatize at 900.degree. to 1300.degree. C., (c) at least one reducing agent selected from alkali metals, alkaline earth metals, and hydrides thereof, and (d) at least one chloride selected from alkali metal chlorides and alkaline earth metal chlorides, (2) heating the mixture in an inert gas atmosphere or under vacuum to provide a reaction mixture, and (3) treating the reaction mixture by a wet process.

Process for producing alloy powder containing rare earth metals

In a process for treating manganese nodules wherein the nodules are reduced so as to convert most of the nickel, copper and cobalt impurities to their metallic state while inhibiting the conversion of the iron and manganese impurities to their metallic state, the resulting reduced ore is wet ground, if necessary, slurried and treated with an aqueous ammoniacal solution containing free oxygen to extract the metallic nickel, copper and cobalt as their ammine complexes. The iron and manganese are removed from the aqueous ammoniacal solution containing iron and manganese as impurities by leaching the slurry of reduced ore by adding sodium chloride or ammonium chloride thereto and blowing air in the leach solution which also contains sulfur dioxide.

Process for treating manganese nodules

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Niihama, Japan

Yasuhiro Okajima