|About this Abstract
||Part C-3: Processing of Critical Metals
||Lithium and Boron Extraction from the Rhyolite Ridge Ore,
||Peter Ehren, Bernard Rowe
|On-Site Speaker (Planned)
A shallow Boron-Lithium resource deposit with the boron and lithium minerals Searleslite (40%wt) and Sepolite (2% wt) are found among principally calcite, feldspar, dolomite and quartz. The equivalent commercial value is about 7-9 %wt Boric acid and 0.8-1.0 %wt Li2CO3 equivalents.
Selectively agitated leach at SGS Lakefield laboratory showed that Searleslite can be acid leach between 20-80 oC and at a pH lower than 4, on the other hand, lithium can be can leached between 20-80 oC and at a pH of 1. So, in other words lithium can be recovered at low temperatures if sufficient free acid available. This opened the way to investigate heap leaching of the mineral and how the composition of pregnant liquor solution (PLS) is evaluating during direct and counter current leaching with sulfuric acid. The key results of these tests will be described in this paper.
||Planned: At-meeting proceedings