The metal component and the metal component of the recovery agent for the recovery method

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The present invention provides a metal component collection agent for collecting one or more metal components from a metal component-containing material; the agent containing, as an active ingredient, a compound containing one or more group 2 elements of the periodic table, or a compound containing one or more lanthanoid elements. The present invention further provides a method for collecting one or more metal components from a metal component-containing material; the method comprising heating the metal component-containing material and the metal component collection agent in such a manner that a metal vapor or metal oxide vapor produced by heating the metal component-containing material is brought into contact with the metal component collection agent. According to the present invention, metal components can be easily and efficiently collected from materials containing highly useful metal components such as noble or rare metal.