%0 Journal Article
%T Mechanism of Pb Removal from Brass Scrap by Compound Separation Using Ca and NaF
%A Hidekazu Sueyoshi
%A Kousaku Yamada
%A Masashi Miyazaki
%A Takuya Okada
%A Nobuyuki Ashie
%A Yoshiharu Kousaka
%J International Journal of Nonferrous Metallurgy
%P 1-7
%@ 2168-2062
%D 2018
%I Scientific Research Publishing
%R 10.4236/ijnm.2018.71001
%X 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.
%K Lead Removal
%K Brass Scrap
%K Calcium
%K Sodium Fluoride
%K Compound Separation
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=82130