Recycling of lead-free silver containing tin solder dross

This patent provides a recycling means for lead-free silver containing tin solder dross. In this patent, the dross was ground to a size of -50 mesh and subjected to a leaching condition of 4N HNO3, 70 DEG C, 2 hours and 5g/50ml to reach leaching recovery of 100% and 0.027% for Ag and Sn, respectivel...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	WANG, KUEN-SHENG, TSAI, SHANG-LIN, LEE, CHING-HWA, LIN, KAE-LONG, GUO, BI-FANG, CHEN, HEI-YI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F FERROUS OR NON-FERROUS ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS INORGANIC CHEMISTRY METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TREATMENT OF ALLOYS OR NON-FERROUS METALS
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	This patent provides a recycling means for lead-free silver containing tin solder dross. In this patent, the dross was ground to a size of -50 mesh and subjected to a leaching condition of 4N HNO3, 70 DEG C, 2 hours and 5g/50ml to reach leaching recovery of 100% and 0.027% for Ag and Sn, respectively. After filtration, the obtained solid is a salable high purity tin oxide. The pH of obtained leaching solution is adjusted to 2 by adding NH4 to precipitate all the Sn which contained in the solution. Then, 100% Ag which remained in the solution are precipitated by adding N2H4.H2O. The collected Ag containing precipitate was washed by 5M HCl in 70 DEG C for 15 minutes and by water in 27 DEG C for another 15 minutes. The washed precipitate was then melted at 1000 DEG C together with boric acid (H3BO3) to obtain a marketable silver ingot.