%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</span><span style=\"font-family:&quot;\"> </span><span style=\"font-family:Verdana;\">NaF addition was
investigated.</span><span style=\"font-family:&quot;\"> </span><span style=\"font-family:Verdana;\">Because
large Ca-Pb compound particles formed by Ca addition ris</span><span style=\"font-family:Verdana;\">e</span><span style=\"font-family:&quot;\"><span style=\"font-family:Verdana;\"> 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 CaF</span><sub><span style=\"font-family:Verdana;\">2</span></sub><span style=\"font-family:Verdana;\">,
liquid Pb and Na gas. Pb is mainly present at the Ca-Pb compound-CaF</span><sub><span style=\"font-family:Verdana;\">2</span></sub><span style=\"font-family:Verdana;\"> interface. CaF</span><sub><span style=\"font-family:Verdana;\">2</span></sub><span style=\"font-family:Verdana;\"> 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