Notice of RetractionRecovery of Rare Earths from Spent Fluorescent Lamps

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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An effective method is developed to reclaim rare earth (RE) metals from spent Fluorescent Lamps. The effects of pH, solid-liquid ratio, stirring intensity and the reaction temperature on leaching process were investigated. The results show that: rare earth trichromatic phosphors contains Y, Eu, Ce, Tb and La, rare earth oxide content is as high as 27.94%; In the experiments, it is found that the rate of rare earth leaching reached 89.85% when the optimum process conditions were as follows: hydrochloric acid concentration of 4.0 mol·L^-1, pH of 8.0,solid-liquid ratio of 100 g^-1, stirring intensity of 600 rpm, reaction temperature of 60°C and reaction time of 1 h; the rate of rare earth recovery reached 94.98% when the process conditions were ammonia concentration of 33.70 g·L^-1, Oxalic acid concentration of 6.25 g·L^-1, aging time of 3 h. The obtained RE sample´s component is analysed by XRF. XRF investigation shows the product is mainly exists in the form of Y₂O₃, indicating few impurities phase appeared. The occupation ratio of Y and Eu oxides reaches 99.35% in the RE products.