Estimation of retorted phosphor powder from spent fluorescent lamps by thermal process

Waste Management
Hun-Su Park, Seung-Whee Rhee

Abstract

The degree of thermal stabilization of phosphor powder from spent fluorescent lamps (SFLs) manufactured by three companies (A, B, C) was estimated by examining mercury content in phosphor powder with retorting time, retorting temperature and rotational speed of drum. Mercury content of phosphor powders from spent fluorescent lamps manufactured by A, B and C companies as samples in thermal experiments was 4031 mg/kg, 3522 mg/kg and 3172 mg/kg, respectively. In the thermal experiments, the optimal conditions for retorting time, retorting temperature, and rotational speed were determined at 6h, 400°C, and 2.0 rpm, respectively. With thermal processing at the optimal conditions, mercury content of all samples for retorted phosphor powder was less than 3.0mg/kg, while efficiency of thermal process to control mercury content was higher than 99.9%. Leaching tests such as Toxicity Characteristic Leaching Procedure (TCLP) and Korea Extraction Test (KET) were subsequently carried out to verify if retorted phosphor powder is hazardous waste. Leaching concentrations of mercury for all samples of retorted phosphor powder were satisfied with regulatory levels in both leaching tests. Hence, retorted phosphor powders at the optimal conditions ...Continue Reading

References

Nov 15, 2003·Waste Management·Cláudio RaposoWalter Alves Durão
Feb 1, 2005·Waste Management·Min JangJae K Park
Jul 8, 2008·Journal of Hazardous Materials·T C ChangY C Chiu
Aug 16, 2011·Waste Management·Ida De MichelisFrancesco Vegliò
Dec 25, 2012·Journal of Environmental Management·Natalia Rey-Raap, Antonio Gallardo
Sep 24, 2013·Waste Management·Seung-Whee RheeHun-Su Park

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