Tin Treatment in Kosaka Lead Smelting
K. Miwa, E. Yamaguchi and S. Satoh
Abstract In Kosaka Smelting and Refining Co., Ltd., tin input increases rapidly
from around 2008, because of TSL furnace starting up and raw materials change
from ores to E-scraps. With tin increase, more dross was produced in lead purification
process, and the dross became deadstock. To recover metals in stocked dross, new
tin recovery process has been installed. At first, in the tin smelting, dross is reduced
with coke in electric furnace and metal consist of tin and lead is produced. The
obtained metal is pulverized under 200 µm diameter and sent to leaching process
with NaOH. After passing through purification processes, the tin containing liquid is
sent to electrowinning process and tin metal is recovered. Thanks to these recovery
processes installation, dross stock has been decreased to zero and other metals in the
dross have also been recovered. Currently, tin metal itself also becomes one of the
main products of Kosaka. In this paper, these tin recovery processes are described.
Keywords Sn · Lead refining · Pyrometallurgical refining
Introduction of Kosaka Flow
Kosaka Smelting and Refining Co., Ltd. is a smelter in northern part of Japan. The
main products are electrolytic copper and lead. In addition, some metals—including
tin, the theme of this paper—are recovered as by-products.
The recent production is shown in Table 1.
As a part of Kosaka process, the process of lead smelting section is shown in Fig. 1.
The main raw material for the lead smelting is lead sulfate, which is composed of
dusts from copper smelting and residues from zinc refinery.
K. Miwa (B) · E. Yamaguchi · S. Satoh
Kosaka Smelting and Refining Co., Ltd., 60-1 Otarube Kosaka-machi Kazuno-gun, Akita
017-0202, Japan
e-mail: miwak@dowa.co.jp
© The Minerals, Metals & Materials Society 2020
A. Siegmund et al. (eds.), PbZn 2020: 9th International Symposium
on Lead and Zinc Processing, The Minerals, Metals & Materials Series,
https://doi.org/10.1007/978-3-030-37070-1_65
759
K. Miwa, E. Yamaguchi and S. Satoh
Abstract In Kosaka Smelting and Refining Co., Ltd., tin input increases rapidly
from around 2008, because of TSL furnace starting up and raw materials change
from ores to E-scraps. With tin increase, more dross was produced in lead purification
process, and the dross became deadstock. To recover metals in stocked dross, new
tin recovery process has been installed. At first, in the tin smelting, dross is reduced
with coke in electric furnace and metal consist of tin and lead is produced. The
obtained metal is pulverized under 200 µm diameter and sent to leaching process
with NaOH. After passing through purification processes, the tin containing liquid is
sent to electrowinning process and tin metal is recovered. Thanks to these recovery
processes installation, dross stock has been decreased to zero and other metals in the
dross have also been recovered. Currently, tin metal itself also becomes one of the
main products of Kosaka. In this paper, these tin recovery processes are described.
Keywords Sn · Lead refining · Pyrometallurgical refining
Introduction of Kosaka Flow
Kosaka Smelting and Refining Co., Ltd. is a smelter in northern part of Japan. The
main products are electrolytic copper and lead. In addition, some metals—including
tin, the theme of this paper—are recovered as by-products.
The recent production is shown in Table 1.
As a part of Kosaka process, the process of lead smelting section is shown in Fig. 1.
The main raw material for the lead smelting is lead sulfate, which is composed of
dusts from copper smelting and residues from zinc refinery.
K. Miwa (B) · E. Yamaguchi · S. Satoh
Kosaka Smelting and Refining Co., Ltd., 60-1 Otarube Kosaka-machi Kazuno-gun, Akita
017-0202, Japan
e-mail: miwak@dowa.co.jp
© The Minerals, Metals & Materials Society 2020
A. Siegmund et al. (eds.), PbZn 2020: 9th International Symposium
on Lead and Zinc Processing, The Minerals, Metals & Materials Series,
https://doi.org/10.1007/978-3-030-37070-1_65
759