PURPOSE: To recollect the different type and mixed metal scrap efficiently and separately by connecting a metal blowing oven to circulate and flow hot air in an oven room with a molten metal holding oven to receive and discharge a molten metal and hot air in one body.

CONSTITUTION: On an oven bed 9 of a metal blowing oven 1, a mixed scrap is stacked to blow hot air into an oven room 6 from a burner 2 for blowing. How air is guided on a top wall 8 in an inclined room, turned by an internal wall 7, circulated to a side wall 3 from an inclined oven bed 9 to heat the mixed scrap equally through the clearance of the mixed scrap on the oven bed 9. At that time, the specified metal is molten by defining hot air at the specified temperature. The molten metal is flown into a molten metal holding oven 12 with hot air through a penetrating pore 13 to hold the still condition by hot air, and floating of solid foreign matters and discharge of hydrogen gasses are executed. When an amount of molten hot water becomes constant, it is taken out and recollected through a hot water drawing pore 16 properly.