Method for recycling iron and steel industry waste

A method of processing waste which includes metal as an object substance by the use of a short rotary kiln to recover a recovered material from said object substance while said object substance travels in a downward direction within said rotary kiln from an upstream side to a downstream side thereof, the short rotary kiln having an inner diameter D, a length L, a ratio L/D not greater than 5, and a single burner on the upstream side, said method comprising the steps of:

• feeding the object substance into the upstream side of the rotary kiln;
• forming a reducing atmosphere in the rotary kiln;
• injecting a combustion gas from the burner into the rotary kiln such that the combustion gas flows in the downward direction;
• heating and melting said object substance with the single burner in the reducing atmosphere on the upstream side in said rotary kiln while the object substance travels in the downward direction within the rotary;
• forming a reduced and molten product on the downstream side of the rotary kiln, the reduced and molten product comprising a metal melt and a slag;
• and
• recovering said recovered material from the reduced and molten product outside of said rotary kiln.