Mechanism of Pb Removal from Brass Scrap by Compound Separation Using Ca and NaF
Open Access
- 1 January 2018
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in International Journal of Nonferrous Metallurgy
- Vol. 07 (01), 1-7
- https://doi.org/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.This publication has 10 references indexed in Scilit:
- Lead removal from brass scrap by fluorine-free compound separationMaterials Science and Technology, 2016
- First-principle studies of Ca–X (X=Si,Ge,Sn,Pb) intermetallic compoundsJournal of Solid State Chemistry, 2010
- Removal of Lead from Copper Alloy Scraps by Compound-Separation MethodMATERIALS TRANSACTIONS, 2005
- Removal of lead from scrap brass.Journal of Advanced Science, 2001
- Microstructural characterization of nanocrystals of ZnO and CuO obtained from basic saltsSolid State Ionics, 1993
- X-ray diffraction investigations of CaF2 at high pressureJournal of Applied Crystallography, 1992
- Formation of (Ca1−xSrx)2PbO4 in Bi(Pb)-Sr-Ca-Cu-O system: Correlation with the formation of the 2223 high-T c phaseJournal of Applied Physics, 1990
- Standard X-Ray Diffraction Powder Patterns from The JCPDS Research AssociateshipPowder Diffraction, 1987
- Standard X-Ray Diffraction Powder Patterns from The JCPDS Research AssociateshipPowder Diffraction, 1986
- Standard X-Ray Diffraction Powder Patterns from the JCPDS Research AssociateshipPowder Diffraction, 1986