Open AccessEnrichment of Tantalum and Niobium Contents in Bangka Tin Slag by NaOH and H3PO4Leaching
Author(s) -
Hendri F. Akli,
Sulaksana Permana,
Ahmad Maksum,
Johny Wahyuadi Soedarsono,
Kurnia Setiawan Widana,
Mutia Anggraini,
Badrul Munir
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/547/1/012050
Subject(s) - leaching (pedology) , tin , tantalum , niobium , titanium , metallurgy , chemistry , phosphoric acid , nuclear chemistry , materials science , environmental science , soil science , soil water
This study explores how 0.23% tantalum and 0.47% niobium in tin slag from the Bangka-Belitung archipelago, Indonesia, are upgraded. To enrich the contents of both metals, this research involves 8M NaOH leaching followed by 0.5M, 1M, and 1.5M phosphoric acid. First, tin slag was roasted at 900°C for 2 hours. Then, the sample was NaOH-leached while H 3 PO 4 was exploited to leach its residues. Next, each of the residues from the leaching processes was characterized by XRF while the filtrates characterization used AAS and ICP-OES. On the one hand, NaOH leaching has proven to decrease the contents of iron, calcium, titanium, and aluminum. On the other hand, 0.5 M H 3 PO 4 leaching optimizes tantalum contents up to 0.85% while 1.0 M H 3 PO 4 leaching maximizes niobium contents up to 1.45%.