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Mechanism of Pb Removal from Brass Scrap by Compound Separation Using Ca and NaF

Sciprofile linkHidekazu Sueyoshi1), Kousaku Yamada, Masashi Miyazaki, Takuya Okada, Nobuyuki Ashie, Yoshiharu Kousaka
International Journal of Nonferrous Metallurgy , Volume 7, pp 1-7; doi:10.4236/ijnm.2018.71001

Abstract: The Mechanism of Pb removal from brass scrap by compound separation using Ca and NaF addition was investigated. Because large Ca-Pb compound particles formed by Ca addition rise to the surface of the molten brass, they can be skimmed off from the molten brass. However, fine Ca-Pb compound particles remain in the molten brass because of low buoyancy. By subsequent NaF addition, the reaction between Ca-Pb compound and NaF takes place at their contact regions, resulting in the formation of solid CaF2, liquid Pb and Na gas. Pb is mainly present at the Ca-Pb compound-CaF2 interface. CaF2 acts as a binder for aggregation of fine Ca-Pb compound particles, resulting in the formation of light and large composite compounds, which rise to the surface of the molten brass. A high Pb removal rate is achieved by skimming off.
Keywords: aggregation of fine / brass scrap / Ca Pb / compound separation / molten brass / NaF / Pb compound / Pb removal / using Ca

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