日本金属学会誌

J. Japan Inst. Metals, Vol. 69, No. 8 (2005),
pp. 699-702

Removal of Lead from Scrap Bronze

Atsushi Nakano1,, Naoki Kajiya1,\footnotemark[1], Kosaku Yamada2, Syun-ichi Nakamura3, Takehiko Matsuda3 and Hidekazu Sueyoshi1

1Graduate School of Science and Engineering, Kagoshima University, Kagoshima 890-0065
2Kyushu Tabuchi Co., Ltd., Kokubu 899-4462
3Kagoshima Prefectural Industrial Technology, Aira-gun, Kagoshima 899-5105

Abstract:

Pb has been added to bronze to increase its machinability. However, due to the extreme toxicity of Pb that is harmful to the health, the public demand for the use of Pb-free bronze has increased. Therefore, scrap bronze containing Pb cannot be utilized as a recycling material and a large amount of scrap bronze will become industrial waste. So, it is necessary to remove Pb in the scrap bronze to promote recycling.
In the present study, the use of the compound-separation method is attempted for the removal of Pb from bronze containing 5.5 mass%Pb. The result shows that the percentage of Pb removal was effective up to 82% when NaF was added to molten bronze, followed by adding a Ca-Si compound.


(Received 2005/4/22)

Keywords:

lead removal, lead-free bronze, recycle, compound-separation method


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