Patent
A process of making cobalt metal powder
TLDR
In this article, a cobalt sulfate solution with hydrogen under a partial hydrogen pressure of at least 1 megapascal and at a temperature at least 180°C was used to produce dense cobalt powder.Abstract:
Dense cobalt powder having coarse, relatively uniformly sized particles can be produced by reducing a cobalt sulphate solution with hydrogen under a partial hydrogen pressure of at least 1 megapascal and at a temperature of at least 180°C. The sulphuric acid generated during the reduction must be neutralised by feeding an alkali metal hydroxide or ammonium hydroxide into the reaction mixture at a rate that does not substantially exceed the molar equivalent of the rate of sulphuric acid production.read more
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Patent
Method for improving metals recovery using high temperature pressure leaching
John O. Marsden,Robert E. Brewer,Joanna M. Robertson,David R. Baughman,Philip Thompson,Wayne W. Hazen,Roland Schmidt +6 more
TL;DR: In this article, a seeding agent is introduced to provide a nucleation site for the crystallization and growth of solid species which otherwise tend to passivate the reactive process or otherwise encapsulate the metal value, thereby reducing the amount of desired metal values partially or completely encapsulated by such material.
Patent
Ultrafine cobalt metal powder, process for the production thereof and use of the cobalt metal powder and of cobalt carbonate
TL;DR: In this article, a process for the production of ultrafine cobalt metal powder via an intermediate stage of cobalt carbonate production, and processes and products re certain uses of the cobalt metals powder and the carbonate and an intermediate oxide so produced.
Patent
Method of preparing ultrafine cobalt metal powder
TL;DR: In this article, a method for producing ultra-fine Co metal powder by reacting a soluble Co salt with a solution or suspension of an alkali or alkaline earth metal or cobalt or ammonium carbonate and or hydrogen carbonate at pH 5.5 to 6.8, separating and washing the precipitated product with H2O, drying it and reducing the CoCO3 obtained to Co metal.
Patent
Ultrafine cobalt metal powder, method of preparing same and also use of cobalt metal powder and of cobalt carbonate
TL;DR: In this article, a method for producing ultra-fine Co metal powder by reacting a soluble Co salt with a solution or suspension of an alkali or alkaline earth metal or cobalt or ammonium carbonate and or hydrogen carbonate at pH 5.5 to 6.8, separating and washing the precipitated product with H2O, drying it and reducing the CoCO3 obtained to Co metal.
Patent
Method for producing cobalt powder
伸一 平郡,Shinichi Hiragori,佳智 尾崎,Keichi Ozaki,高石 和幸,Kazuyuki Takaishi,和幸 高石,安夫 土居,Yasuo Doi,修 池田,Ikeda Osamu,龍馬 山隈,Ryoma Yamaguma,陽平 工藤,Kudo Yohei +14 more
TL;DR: In this paper, a seed crystal addition step was used to generate coarse grains of high purity Co powder from a cobalt sulfate ammine complex solution using an industrially inexpensive Hgas and using fine Co powder.
References
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Patent
Recovery of copper and cobalt values from sulphate leach solutions
Edgar B Mancke,Frank M Temmel +1 more
Patent
Dissolution of cobaltic hydroxide with organic reductant
TL;DR: In this paper, a method for effecting the dissolution of a cobaltic hydroxide-containing precipitate which may also contain nickel is provided, wherein an aqueous slurry of the precipitate containing trivalent metal is acidified to a pH of from about 0.1 to 2, and the aqueously slurry then treated with an organic reductant to effect substantial reduction of the trivalents metal to the divalent state and hence the dissolution.