公开(公告)号：US20240035114A1

公开(公告)日：2024-02-01

申请号：US18255641

申请日：2021-09-09

Applicant: CHUGAI RO CO., LTD.

Inventor： Yoshifumi ITO ,  Toshiyuki OKUMURA

IPC: C22B19/04 ,  F27B7/08 ,  F27B7/20 ,  C22B7/02

CPC classification number: C22B19/04 ,  F27B7/08 ,  F27B7/2075 ,  C22B7/02

Abstract: Dust Da containing zinc and iron is charged in a rotative cylindrical kiln base body 11 of an indirect-heating rotary kiln 10 and is subjected to heat treatment in the kiln base body so that zinc contained in the dust is volatilized. The volatilized zinc is guided to a treatment device 30 through an exhaust pipe 31 disposed at a discharge part 16 of the rotary kiln and is recovered. A residue Db resulting from the treatment in the kiln base body is transferred from a residue outlet 16b disposed at the discharge part 16 of the rotary kiln to a burner device 40, in which the residue is combusted and heated.