Method of recovering metal

A method of producing a metal, comprising the combination of:

• a method of storing a metal component, comprising:
• heating a metal-containing material in the presence of a perovskite-type composite oxide represented by Composition formula (1), to store a metal component of the material in the perovskite-type composite oxide, wherein the metal component is stored as an ion thereof:
• Composition formula (1):
• ABHaO3-b (1)
• wherein
• A represents at least one element selected from the group consisting of lanthanoid elements and Group 2 elements of the periodic table, and
• B represents at least one element selected from the group consisting of Group 3 elements, Group 4 elements, Group 13 elements, and transition metal elements of the fourth period of the periodic table;
• symbols a and b represent quantities of hydrogen and oxygen vacancies, respectively, and represent values within the range below, respectively:
• 0≦a≦1.0, 0≦b≦0.5;
• and wherein heating is performed such that the metal-containing material and the perovskite-type composite oxide are not in contact with each other;
• a method of eluting the metal component in an acid, comprising:
• treating the aforementioned composite oxide in which the metal component is stored, with an acid;
• and
• a method of recovering the metal component, comprising:
• recovering the metal component eluted in the aforementioned acid, from the acid.

A method of storing a metal component, comprising:

• heating a metal-containing material in the presence of a perovskite-type composite oxide represented by Composition formula (1), to store a metal component of the material in the perovskite-type composite oxide, wherein the metal component is stored as an ion thereof:
• Composition formula (1):
• ABHaO3-b (1)
• wherein
• A represents at least one element selected from the group consisting of lanthanoid elements and Group 2 elements of the periodic table, and
• B represents at least one element selected from the group consisting of Group 3 elements, Group 4 elements, Group 13 elements, and transition metal elements of the fourth period of the periodic table;
• symbols a and b represent quantities of hydrogen and oxygen vacancies, respectively, and represent values within the range below, respectively:
• 0≦a≦1.0, 0≦b≦0.5, and
• wherein heating is conducted in a state in which a vapor of a metal or metal oxide produced by heating the metal-containing material and the perovskite-type composite oxide is brought into contact with the composite oxide.