Valuable matter recovery method

A method for recovering a valuable substance, the method comprising:

• thermally treating a target containing a valuable substance while supporting a target storing unit, in which the target is stored, by a supporting unit that can support the target storing unit, wherein the thermally treating includes heating a gas present in a region, in which the supporting unit is positioned, by a flame for thermally treating the target such that the target storing unit is not contacted by the flame;
• and
• recovering the valuable substance from a thermally treated product obtained by thermally treating the target,
• wherein, in the thermally treating, by directing the flame in an approximately horizontal direction by using two burners below the target storing unit, the target is heated by causing a heated gas to rise while preventing the flame from contacting the target storing unit,
• wherein, when the two burners are viewed from above the target storing unit, and when one of the two burners is disposed on an upper left side, the other burner of the two burners is disposed on a lower right side, and a partition is provided between the one burner of the two burners and the other burner of the two burners.