To provide a method by which high-purity ruthenium can be recovered at high recovery rate from a substance containing low-concentration ruthenium and also containing many elements in addition to ruthenium.
Metal ruthenium is recovered from a ruthenium-containing substance by performing an alkali dissolution step, a wet leaching step, a wet reduction step and a reduction step. In the alkali dissolution step, hydroxide and/or carbonate compound is used as alkaline melt, an oxidizing agent is added when dissolving the ruthenium-containing substance, and the ruthenium-containing substance is dissolved in a vessel made of silver or nickel. An alkaline agent is added to an aqueous solution of ruthenium to adjust pH, and silicate is added into the aqueous solution of ruthenium and stirring is done. In the wet reduction step, a solution containing boron hydride compound is used as a reducing agent. After the wet reduction step, an acid cleaning step where ruthenium hydroxide is stirred in an acid solution is performed.
COPYRIGHT: (C)2009,JPO&INPIT
Kenji Ichiyasu
Norio Nakajima
Namiki Yoshihito
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Kosaku Sugimura
Kiyoshi Kuruma
Shiro Fujitani
Tatsuya Sawada