|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Rare Metal Extraction & Processing
||Selective Reduction and Separation of Europium from Mixed Rare-earth Oxides Recovered from Waste Fluorescent Lamp Phosphors
||Mark Strauss, Brajendra Mishra, Gerard Martins
|On-Site Speaker (Planned)
Europium is essential for high technology applications such as cell phones and computers screens. Recovering europium fluorescent lamps is a strategy to supply current and future demand. Previous research produces a mixed europium/yttrium concentrate. Europium is separated from the concentrate by reducing Eu(III) to Eu(II) via zinc powder and precipitating europium (II) sulfate from solution using sulfuric acid. This paper studied the effect of 3 parameters: pulp density of europium in the feed solution, pH of the feed solution, precipitation time upon the grade and recovery of were europium (II) sulfate. After optimizing these conditions, it was determined the best conditions for the feed was 6 grams per liter europium metal at pH 3.5 and a precipitation time of 3 hours. After one stage of selective reduction and precipitation using the optimized conditions, the purity of europium (II) sulfate was 99.3% and the recovery was 98.7%.